Commit 32be6e9b2a

Andrew Kelley <superjoe30@gmail.com>
2018-09-10 19:46:23
caching is working
* add almost all the input parameter state to the hash - missing items are the detected MSVC installation on Windows and detected libc installation on POSIX - also missing are C files and .h files that libclang finds * artifacts are created in global cache directory instead of zig-cache. - exception: builtin.zig is still in zig-cache * zig run uses the new cache correctly * zig run uses execv on posix systems
1 parent fbe5737
src/all_types.hpp
@@ -1554,6 +1554,40 @@ struct CodeGen {
     ZigLLVMDICompileUnit *compile_unit;
     ZigLLVMDIFile *compile_unit_file;
     LinkLib *libc_link_lib;
+    LLVMTargetDataRef target_data_ref;
+    LLVMTargetMachineRef target_machine;
+    ZigLLVMDIFile *dummy_di_file;
+    LLVMValueRef cur_ret_ptr;
+    LLVMValueRef cur_fn_val;
+    LLVMValueRef cur_err_ret_trace_val_arg;
+    LLVMValueRef cur_err_ret_trace_val_stack;
+    LLVMValueRef memcpy_fn_val;
+    LLVMValueRef memset_fn_val;
+    LLVMValueRef trap_fn_val;
+    LLVMValueRef return_address_fn_val;
+    LLVMValueRef frame_address_fn_val;
+    LLVMValueRef coro_destroy_fn_val;
+    LLVMValueRef coro_id_fn_val;
+    LLVMValueRef coro_alloc_fn_val;
+    LLVMValueRef coro_size_fn_val;
+    LLVMValueRef coro_begin_fn_val;
+    LLVMValueRef coro_suspend_fn_val;
+    LLVMValueRef coro_end_fn_val;
+    LLVMValueRef coro_free_fn_val;
+    LLVMValueRef coro_resume_fn_val;
+    LLVMValueRef coro_save_fn_val;
+    LLVMValueRef coro_promise_fn_val;
+    LLVMValueRef coro_alloc_helper_fn_val;
+    LLVMValueRef coro_frame_fn_val;
+    LLVMValueRef merge_err_ret_traces_fn_val;
+    LLVMValueRef add_error_return_trace_addr_fn_val;
+    LLVMValueRef stacksave_fn_val;
+    LLVMValueRef stackrestore_fn_val;
+    LLVMValueRef write_register_fn_val;
+    LLVMValueRef sp_md_node;
+    LLVMValueRef err_name_table;
+    LLVMValueRef safety_crash_err_fn;
+    LLVMValueRef return_err_fn;
 
     // reminder: hash tables must be initialized before use
     HashMap<Buf *, ImportTableEntry *, buf_hash, buf_eql_buf> import_table;
@@ -1576,8 +1610,23 @@ struct CodeGen {
     size_t resolve_queue_index;
     ZigList<AstNode *> use_queue;
     size_t use_queue_index;
+    ZigList<TimeEvent> timing_events;
+    ZigList<ZigLLVMDIType **> error_di_types;
+    ZigList<AstNode *> tld_ref_source_node_stack;
+    ZigList<ZigFn *> inline_fns;
+    ZigList<ZigFn *> test_fns;
+    ZigList<ZigLLVMDIEnumerator *> err_enumerators;
+    ZigList<ErrorTableEntry *> errors_by_index;
+    size_t largest_err_name_len;
 
-    uint32_t next_unresolved_index;
+    PackageTableEntry *std_package;
+    PackageTableEntry *panic_package;
+    PackageTableEntry *test_runner_package;
+    PackageTableEntry *compile_var_package;
+    ImportTableEntry *compile_var_import;
+    ImportTableEntry *root_import;
+    ImportTableEntry *bootstrap_import;
+    ImportTableEntry *test_runner_import;
 
     struct {
         ZigType *entry_bool;
@@ -1613,30 +1662,45 @@ struct CodeGen {
         ZigType *entry_arg_tuple;
         ZigType *entry_promise;
     } builtin_types;
+    ZigType *align_amt_type;
+    ZigType *stack_trace_type;
+    ZigType *ptr_to_stack_trace_type;
+    ZigType *err_tag_type;
+    ZigType *test_fn_type;
 
-    CacheHash cache_hash;
+    Buf triple_str;
+    Buf global_asm;
+    Buf *out_h_path;
+    Buf cache_dir;
+    Buf artifact_dir;
+    Buf output_file_path;
+    Buf o_file_output_path;
+    Buf *wanted_output_file_path;
 
-    //////////////////////////// Participates in Input Parameter Cache Hash
-    Buf *compiler_id;
-    ZigList<LinkLib *> link_libs_list;
-    // add -framework [name] args to linker
-    ZigList<Buf *> darwin_frameworks;
-    // add -rpath [name] args to linker
-    ZigList<Buf *> rpath_list;
+    IrInstruction *invalid_instruction;
 
-    EmitFileType emit_file_type;
-    BuildMode build_mode;
-    OutType out_type;
+    ConstExprValue const_void_val;
+    ConstExprValue panic_msg_vals[PanicMsgIdCount];
 
+    // The function definitions this module includes.
+    ZigList<ZigFn *> fn_defs;
+    size_t fn_defs_index;
+    ZigList<TldVar *> global_vars;
 
-    //////////////////////////// Unsorted
+    ZigFn *cur_fn;
+    ZigFn *main_fn;
+    ZigFn *panic_fn;
+    AstNode *root_export_decl;
 
-    ZigTarget zig_target;
-    LLVMTargetDataRef target_data_ref;
+    CacheHash cache_hash;
+    ErrColor err_color;
+    uint32_t next_unresolved_index;
     unsigned pointer_size_bytes;
+    uint32_t target_os_index;
+    uint32_t target_arch_index;
+    uint32_t target_environ_index;
+    uint32_t target_oformat_index;
     bool is_big_endian;
-    bool is_static;
-    bool strip_debug_symbols;
     bool want_h_file;
     bool have_pub_main;
     bool have_c_main;
@@ -1644,148 +1708,75 @@ struct CodeGen {
     bool have_winmain_crt_startup;
     bool have_dllmain_crt_startup;
     bool have_pub_panic;
-    Buf *libc_lib_dir;
-    Buf *libc_static_lib_dir;
-    Buf *libc_include_dir;
-    Buf *msvc_lib_dir;
-    Buf *kernel32_lib_dir;
-    Buf *zig_lib_dir;
-    Buf *zig_std_dir;
-    Buf *zig_c_headers_dir;
-    Buf *zig_std_special_dir;
-    Buf *dynamic_linker;
-    Buf *ar_path;
-    ZigWindowsSDK *win_sdk;
-    Buf triple_str;
-    bool is_test_build;
     bool have_err_ret_tracing;
-    uint32_t target_os_index;
-    uint32_t target_arch_index;
-    uint32_t target_environ_index;
-    uint32_t target_oformat_index;
-    LLVMTargetMachineRef target_machine;
-    ZigLLVMDIFile *dummy_di_file;
-    bool is_native_target;
-    PackageTableEntry *root_package; // participates in cache hash
-    PackageTableEntry *std_package;
-    PackageTableEntry *panic_package;
-    PackageTableEntry *test_runner_package;
-    PackageTableEntry *compile_var_package;
-    ImportTableEntry *compile_var_import;
-    Buf *root_out_name; // participates in cache hash
-    bool windows_subsystem_windows;
-    bool windows_subsystem_console;
-    Buf *mmacosx_version_min;
-    Buf *mios_version_min;
-    bool linker_rdynamic;
-    const char *linker_script;
-
-    // The function definitions this module includes.
-    ZigList<ZigFn *> fn_defs;
-    size_t fn_defs_index;
-    ZigList<TldVar *> global_vars;
-
-    ZigFn *cur_fn;
-    ZigFn *main_fn;
-    ZigFn *panic_fn;
-    LLVMValueRef cur_ret_ptr;
-    LLVMValueRef cur_fn_val;
-    LLVMValueRef cur_err_ret_trace_val_arg;
-    LLVMValueRef cur_err_ret_trace_val_stack;
     bool c_want_stdint;
     bool c_want_stdbool;
-    AstNode *root_export_decl;
-    size_t version_major;
-    size_t version_minor;
-    size_t version_patch;
     bool verbose_tokenize;
     bool verbose_ast;
     bool verbose_link;
     bool verbose_ir;
     bool verbose_llvm_ir;
     bool verbose_cimport;
-    ErrColor err_color;
-    ImportTableEntry *root_import;
-    ImportTableEntry *bootstrap_import;
-    ImportTableEntry *test_runner_import;
-    LLVMValueRef memcpy_fn_val;
-    LLVMValueRef memset_fn_val;
-    LLVMValueRef trap_fn_val;
-    LLVMValueRef return_address_fn_val;
-    LLVMValueRef frame_address_fn_val;
-    LLVMValueRef coro_destroy_fn_val;
-    LLVMValueRef coro_id_fn_val;
-    LLVMValueRef coro_alloc_fn_val;
-    LLVMValueRef coro_size_fn_val;
-    LLVMValueRef coro_begin_fn_val;
-    LLVMValueRef coro_suspend_fn_val;
-    LLVMValueRef coro_end_fn_val;
-    LLVMValueRef coro_free_fn_val;
-    LLVMValueRef coro_resume_fn_val;
-    LLVMValueRef coro_save_fn_val;
-    LLVMValueRef coro_promise_fn_val;
-    LLVMValueRef coro_alloc_helper_fn_val;
-    LLVMValueRef coro_frame_fn_val;
-    LLVMValueRef merge_err_ret_traces_fn_val;
-    LLVMValueRef add_error_return_trace_addr_fn_val;
-    LLVMValueRef stacksave_fn_val;
-    LLVMValueRef stackrestore_fn_val;
-    LLVMValueRef write_register_fn_val;
     bool error_during_imports;
+    bool generate_error_name_table;
 
-    LLVMValueRef sp_md_node;
-
-    const char **clang_argv;
-    size_t clang_argv_len;
+    //////////////////////////// Participates in Input Parameter Cache Hash
+    ZigList<LinkLib *> link_libs_list;
+    // add -framework [name] args to linker
+    ZigList<Buf *> darwin_frameworks;
+    // add -rpath [name] args to linker
+    ZigList<Buf *> rpath_list;
+    ZigList<Buf *> forbidden_libs;
+    ZigList<Buf *> link_objects;
+    ZigList<Buf *> assembly_files;
     ZigList<const char *> lib_dirs;
 
-    const char **llvm_argv;
-    size_t llvm_argv_len;
-
-    ZigList<ZigFn *> test_fns;
-    ZigType *test_fn_type;
+    Buf *compiler_id;
+    size_t version_major;
+    size_t version_minor;
+    size_t version_patch;
+    const char *linker_script;
 
+    EmitFileType emit_file_type;
+    BuildMode build_mode;
+    OutType out_type;
+    ZigTarget zig_target;
+    bool is_static;
+    bool strip_debug_symbols;
+    bool is_test_build;
+    bool is_native_target;
+    bool windows_subsystem_windows;
+    bool windows_subsystem_console;
+    bool linker_rdynamic;
+    bool no_rosegment_workaround;
     bool each_lib_rpath;
 
-    ZigType *err_tag_type;
-    ZigList<ZigLLVMDIEnumerator *> err_enumerators;
-    ZigList<ErrorTableEntry *> errors_by_index;
-    bool generate_error_name_table;
-    LLVMValueRef err_name_table;
-    size_t largest_err_name_len;
-    LLVMValueRef safety_crash_err_fn;
-
-    LLVMValueRef return_err_fn;
-
-    IrInstruction *invalid_instruction;
-    ConstExprValue const_void_val;
-
-    ConstExprValue panic_msg_vals[PanicMsgIdCount];
-
-    Buf global_asm;
-    ZigList<Buf *> link_objects;
-    ZigList<Buf *> assembly_files;
-
+    Buf *mmacosx_version_min;
+    Buf *mios_version_min;
+    Buf *root_out_name;
     Buf *test_filter;
     Buf *test_name_prefix;
+    PackageTableEntry *root_package;
 
-    ZigList<TimeEvent> timing_events;
-
-    Buf cache_dir;
-    Buf *out_h_path;
-
-    ZigList<ZigFn *> inline_fns;
-    ZigList<AstNode *> tld_ref_source_node_stack;
-
-    ZigType *align_amt_type;
-    ZigType *stack_trace_type;
-    ZigType *ptr_to_stack_trace_type;
+    const char **llvm_argv;
+    size_t llvm_argv_len;
 
-    ZigList<ZigLLVMDIType **> error_di_types;
+    const char **clang_argv;
+    size_t clang_argv_len;
 
-    ZigList<Buf *> forbidden_libs;
+    //////////////////////////// Unsorted
 
-    bool no_rosegment_workaround;
+    Buf *libc_lib_dir;
+    Buf *libc_static_lib_dir;
+    Buf *libc_include_dir;
+    Buf *msvc_lib_dir;
+    Buf *kernel32_lib_dir;
+    Buf *zig_lib_dir;
+    Buf *zig_std_dir;
+    Buf *zig_c_headers_dir;
+    Buf *zig_std_special_dir;
+    Buf *dynamic_linker;
+    ZigWindowsSDK *win_sdk;
 };
 
 enum VarLinkage {
src/cache_hash.cpp
@@ -37,6 +37,20 @@ void cache_int(CacheHash *ch, int x) {
     blake2b_update(&ch->blake, buf, sizeof(int) + 1);
 }
 
+void cache_usize(CacheHash *ch, size_t x) {
+    assert(ch->manifest_file_path == nullptr);
+    // + 1 to include the null byte
+    uint8_t buf[sizeof(size_t) + 1];
+    memcpy(buf, &x, sizeof(size_t));
+    buf[sizeof(size_t)] = 0;
+    blake2b_update(&ch->blake, buf, sizeof(size_t) + 1);
+}
+
+void cache_bool(CacheHash *ch, bool x) {
+    assert(ch->manifest_file_path == nullptr);
+    blake2b_update(&ch->blake, &x, 1);
+}
+
 void cache_buf(CacheHash *ch, Buf *buf) {
     assert(ch->manifest_file_path == nullptr);
     assert(buf != nullptr);
@@ -74,6 +88,26 @@ void cache_list_of_buf(CacheHash *ch, Buf **ptr, size_t len) {
     cache_str(ch, "");
 }
 
+void cache_list_of_file(CacheHash *ch, Buf **ptr, size_t len) {
+    assert(ch->manifest_file_path == nullptr);
+
+    for (size_t i = 0; i < len; i += 1) {
+        Buf *buf = ptr[i];
+        cache_file(ch, buf);
+    }
+    cache_str(ch, "");
+}
+
+void cache_list_of_str(CacheHash *ch, const char **ptr, size_t len) {
+    assert(ch->manifest_file_path == nullptr);
+
+    for (size_t i = 0; i < len; i += 1) {
+        const char *s = ptr[i];
+        cache_str(ch, s);
+    }
+    cache_str(ch, "");
+}
+
 void cache_file(CacheHash *ch, Buf *file_path) {
     assert(ch->manifest_file_path == nullptr);
     assert(file_path != nullptr);
@@ -154,9 +188,13 @@ static Error base64_decode(Slice<uint8_t> dest, Slice<uint8_t> source) {
     return ErrorNone;
 }
 
-static Error hash_file(uint8_t *digest, OsFile handle) {
+static Error hash_file(uint8_t *digest, OsFile handle, Buf *contents) {
     Error err;
 
+    if (contents) {
+        buf_resize(contents, 0);
+    }
+
     blake2b_state blake;
     int rc = blake2b_init(&blake, 48);
     assert(rc == 0);
@@ -172,10 +210,13 @@ static Error hash_file(uint8_t *digest, OsFile handle) {
             return ErrorNone;
         }
         blake2b_update(&blake, buf, amt);
+        if (contents) {
+            buf_append_mem(contents, (char*)buf, amt);
+        }
     }
 }
 
-static Error populate_file_hash(CacheHash *ch, CacheHashFile *chf) {
+static Error populate_file_hash(CacheHash *ch, CacheHashFile *chf, Buf *contents) {
     Error err;
 
     assert(chf->path != nullptr);
@@ -189,7 +230,7 @@ static Error populate_file_hash(CacheHash *ch, CacheHashFile *chf) {
         return err;
     }
 
-    if ((err = hash_file(chf->bin_digest, this_file))) {
+    if ((err = hash_file(chf->bin_digest, this_file, contents))) {
         os_file_close(this_file);
         return err;
     }
@@ -323,7 +364,7 @@ Error cache_hit(CacheHash *ch, Buf *out_digest) {
             chf->mtime = actual_mtime;
 
             uint8_t actual_digest[48];
-            if ((err = hash_file(actual_digest, this_file))) {
+            if ((err = hash_file(actual_digest, this_file, nullptr))) {
                 os_file_close(this_file);
                 os_file_close(ch->manifest_file);
                 return err;
@@ -344,7 +385,7 @@ Error cache_hit(CacheHash *ch, Buf *out_digest) {
         ch->manifest_dirty = true;
         for (; file_i < input_file_count; file_i += 1) {
             CacheHashFile *chf = &ch->files.at(file_i);
-            if ((err = populate_file_hash(ch, chf))) {
+            if ((err = populate_file_hash(ch, chf, nullptr))) {
                 os_file_close(ch->manifest_file);
                 return err;
             }
@@ -355,13 +396,13 @@ Error cache_hit(CacheHash *ch, Buf *out_digest) {
     return cache_final(ch, out_digest);
 }
 
-Error cache_add_file(CacheHash *ch, Buf *path) {
+Error cache_add_file_fetch(CacheHash *ch, Buf *resolved_path, Buf *contents) {
     Error err;
 
     assert(ch->manifest_file_path != nullptr);
     CacheHashFile *chf = ch->files.add_one();
-    chf->path = path;
-    if ((err = populate_file_hash(ch, chf))) {
+    chf->path = resolved_path;
+    if ((err = populate_file_hash(ch, chf, contents))) {
         os_file_close(ch->manifest_file);
         return err;
     }
@@ -369,6 +410,12 @@ Error cache_add_file(CacheHash *ch, Buf *path) {
     return ErrorNone;
 }
 
+Error cache_add_file(CacheHash *ch, Buf *path) {
+    Buf *resolved_path = buf_alloc();
+    *resolved_path = os_path_resolve(&path, 1);
+    return cache_add_file_fetch(ch, resolved_path, nullptr);
+}
+
 static Error write_manifest_file(CacheHash *ch) {
     Error err;
     Buf contents = BUF_INIT;
@@ -398,7 +445,8 @@ Error cache_final(CacheHash *ch, Buf *out_digest) {
                     buf_ptr(ch->manifest_file_path), err_str(err));
         }
     }
-    os_file_close(ch->manifest_file);
+    // We don't close the manifest file yet, because we want to
+    // keep it locked until the API user is done using it.
 
     uint8_t bin_digest[48];
     int rc = blake2b_final(&ch->blake, bin_digest, 48);
@@ -408,3 +456,7 @@ Error cache_final(CacheHash *ch, Buf *out_digest) {
 
     return ErrorNone;
 }
+
+void cache_release(CacheHash *ch) {
+    os_file_close(ch->manifest_file);
+}
src/cache_hash.hpp
@@ -17,6 +17,7 @@ struct CacheHashFile {
     Buf *path;
     OsTimeStamp mtime;
     uint8_t bin_digest[48];
+    Buf *contents;
 };
 
 struct CacheHash {
@@ -34,24 +35,36 @@ void cache_init(CacheHash *ch, Buf *manifest_dir);
 // Next, use the hash population functions to add the initial parameters.
 void cache_str(CacheHash *ch, const char *ptr);
 void cache_int(CacheHash *ch, int x);
+void cache_bool(CacheHash *ch, bool x);
+void cache_usize(CacheHash *ch, size_t x);
 void cache_buf(CacheHash *ch, Buf *buf);
 void cache_buf_opt(CacheHash *ch, Buf *buf);
 void cache_list_of_link_lib(CacheHash *ch, LinkLib **ptr, size_t len);
 void cache_list_of_buf(CacheHash *ch, Buf **ptr, size_t len);
+void cache_list_of_file(CacheHash *ch, Buf **ptr, size_t len);
+void cache_list_of_str(CacheHash *ch, const char **ptr, size_t len);
 void cache_file(CacheHash *ch, Buf *path);
 void cache_file_opt(CacheHash *ch, Buf *path);
 
 // Then call cache_hit when you're ready to see if you can skip the next step.
-// out_b64_digest will be left unchanged if it was a cache miss
+// out_b64_digest will be left unchanged if it was a cache miss.
+// If you got a cache hit, the next step is cache_release.
+// From this point on, there is a lock on the input params. Release
+// the lock with cache_release.
 Error ATTRIBUTE_MUST_USE cache_hit(CacheHash *ch, Buf *out_b64_digest);
 
-// If you got a cache hit, the flow is done. No more functions to call.
-// Next call this function for every file that is depended on.
+// If you did not get a cache hit, call this function for every file
+// that is depended on, and then finish with cache_final.
 Error ATTRIBUTE_MUST_USE cache_add_file(CacheHash *ch, Buf *path);
 
-// If you did not get a cache hit, use the hash population functions again
-// and do all the actual work. When done use cache_final to save the cache
-// for next time.
-Error ATTRIBUTE_MUST_USE cache_final(CacheHash *ch, Buf *out_digest);
+// This variant of cache_add_file returns the file contents.
+// Also the file path argument must be already resolved.
+Error ATTRIBUTE_MUST_USE cache_add_file_fetch(CacheHash *ch, Buf *resolved_path, Buf *contents);
+
+// out_b64_digest will be the same thing that cache_hit returns if you got a cache hit
+Error ATTRIBUTE_MUST_USE cache_final(CacheHash *ch, Buf *out_b64_digest);
+
+// Until this function is called, no one will be able to get a lock on your input params.
+void cache_release(CacheHash *ch);
 
 #endif
src/codegen.cpp
@@ -13,7 +13,6 @@
 #include "error.hpp"
 #include "hash_map.hpp"
 #include "ir.hpp"
-#include "link.hpp"
 #include "os.hpp"
 #include "translate_c.hpp"
 #include "target.hpp"
@@ -188,6 +187,10 @@ void codegen_set_output_h_path(CodeGen *g, Buf *h_path) {
     g->out_h_path = h_path;
 }
 
+void codegen_set_output_path(CodeGen *g, Buf *path) {
+    g->wanted_output_file_path = path;
+}
+
 void codegen_set_clang_argv(CodeGen *g, const char **args, size_t len) {
     g->clang_argv = args;
     g->clang_argv_len = len;
@@ -5756,8 +5759,6 @@ static void validate_inline_fns(CodeGen *g) {
 static void do_code_gen(CodeGen *g) {
     assert(!g->errors.length);
 
-    codegen_add_time_event(g, "Code Generation");
-
     {
         // create debug type for error sets
         assert(g->err_enumerators.length == g->errors_by_index.length);
@@ -6068,38 +6069,10 @@ static void do_code_gen(CodeGen *g) {
 
     codegen_add_time_event(g, "LLVM Emit Output");
 
-    char *err_msg = nullptr;
-    Buf *o_basename = buf_create_from_buf(g->root_out_name);
-
-    switch (g->emit_file_type) {
-        case EmitFileTypeBinary:
-        {
-            const char *o_ext = target_o_file_ext(&g->zig_target);
-            buf_append_str(o_basename, o_ext);
-            break;
-        }
-        case EmitFileTypeAssembly:
-        {
-            const char *asm_ext = target_asm_file_ext(&g->zig_target);
-            buf_append_str(o_basename, asm_ext);
-            break;
-        }
-        case EmitFileTypeLLVMIr:
-        {
-            const char *llvm_ir_ext = target_llvm_ir_file_ext(&g->zig_target);
-            buf_append_str(o_basename, llvm_ir_ext);
-            break;
-        }
-        default:
-            zig_unreachable();
-    }
-
-    Buf *output_path = buf_alloc();
-    os_path_join(&g->cache_dir, o_basename, output_path);
-    ensure_cache_dir(g);
-
     bool is_small = g->build_mode == BuildModeSmallRelease;
 
+    Buf *output_path = &g->o_file_output_path;
+    char *err_msg = nullptr;
     switch (g->emit_file_type) {
         case EmitFileTypeBinary:
             if (ZigLLVMTargetMachineEmitToFile(g->target_machine, g->module, buf_ptr(output_path),
@@ -6118,7 +6091,6 @@ static void do_code_gen(CodeGen *g) {
                 zig_panic("unable to write assembly file %s: %s", buf_ptr(output_path), err_msg);
             }
             validate_inline_fns(g);
-            g->link_objects.append(output_path);
             break;
 
         case EmitFileTypeLLVMIr:
@@ -6128,7 +6100,6 @@ static void do_code_gen(CodeGen *g) {
                 zig_panic("unable to write llvm-ir file %s: %s", buf_ptr(output_path), err_msg);
             }
             validate_inline_fns(g);
-            g->link_objects.append(output_path);
             break;
 
         default:
@@ -7035,8 +7006,8 @@ static ImportTableEntry *add_special_code(CodeGen *g, PackageTableEntry *package
     Buf *resolved_path = buf_alloc();
     *resolved_path = os_path_resolve(resolve_paths, 1);
     Buf *import_code = buf_alloc();
-    int err;
-    if ((err = os_fetch_file_path(resolved_path, import_code, false))) {
+    Error err;
+    if ((err = cache_add_file_fetch(&g->cache_hash, resolved_path, import_code))) {
         zig_panic("unable to open '%s': %s\n", buf_ptr(&path_to_code_src), err_str(err));
     }
 
@@ -7131,6 +7102,8 @@ static void gen_root_source(CodeGen *g) {
 
     Buf *source_code = buf_alloc();
     int err;
+    // No need for using the caching system for this file fetch because it is handled
+    // separately.
     if ((err = os_fetch_file_path(resolved_path, source_code, true))) {
         fprintf(stderr, "unable to open '%s': %s\n", buf_ptr(resolved_path), err_str(err));
         exit(1);
@@ -7197,6 +7170,8 @@ static void gen_global_asm(CodeGen *g) {
     int err;
     for (size_t i = 0; i < g->assembly_files.length; i += 1) {
         Buf *asm_file = g->assembly_files.at(i);
+        // No need to use the caching system for these fetches because they
+        // are handled separately.
         if ((err = os_fetch_file_path(asm_file, &contents,  false))) {
             zig_panic("Unable to read %s: %s", buf_ptr(asm_file), err_str(err));
         }
@@ -7460,14 +7435,9 @@ static Buf *preprocessor_mangle(Buf *src) {
 }
 
 static void gen_h_file(CodeGen *g) {
-    if (!g->want_h_file)
-        return;
-
     GenH gen_h_data = {0};
     GenH *gen_h = &gen_h_data;
 
-    codegen_add_time_event(g, "Generate .h");
-
     assert(!g->is_test_build);
 
     if (!g->out_h_path) {
@@ -7675,6 +7645,24 @@ void codegen_add_time_event(CodeGen *g, const char *name) {
     g->timing_events.append({os_get_time(), name});
 }
 
+static void add_cache_pkg(CodeGen *g, CacheHash *ch, PackageTableEntry *pkg) {
+    if (buf_len(&pkg->root_src_path) == 0)
+        return;
+
+    Buf *rel_full_path = buf_alloc();
+    os_path_join(&pkg->root_src_dir, &pkg->root_src_path, rel_full_path);
+    cache_file(ch, rel_full_path);
+
+    auto it = pkg->package_table.entry_iterator();
+    for (;;) {
+        auto *entry = it.next();
+        if (!entry)
+            break;
+
+        cache_buf(ch, entry->key);
+        add_cache_pkg(g, ch, entry->value);
+    }
+}
 
 // Called before init()
 static Error check_cache(CodeGen *g, Buf *manifest_dir, Buf *digest) {
@@ -7683,16 +7671,46 @@ static Error check_cache(CodeGen *g, Buf *manifest_dir, Buf *digest) {
     CacheHash *ch = &g->cache_hash;
     cache_init(ch, manifest_dir);
 
+    add_cache_pkg(g, ch, g->root_package);
+    if (g->linker_script != nullptr) {
+        cache_file(ch, buf_create_from_str(g->linker_script));
+    }
     cache_buf(ch, g->compiler_id);
     cache_buf(ch, g->root_out_name);
-    cache_file(ch, get_resolved_root_src_path(g)); // Root source file
     cache_list_of_link_lib(ch, g->link_libs_list.items, g->link_libs_list.length);
     cache_list_of_buf(ch, g->darwin_frameworks.items, g->darwin_frameworks.length);
     cache_list_of_buf(ch, g->rpath_list.items, g->rpath_list.length);
+    cache_list_of_buf(ch, g->forbidden_libs.items, g->forbidden_libs.length);
+    cache_list_of_file(ch, g->link_objects.items, g->link_objects.length);
+    cache_list_of_file(ch, g->assembly_files.items, g->assembly_files.length);
     cache_int(ch, g->emit_file_type);
     cache_int(ch, g->build_mode);
     cache_int(ch, g->out_type);
-    // TODO the rest of the struct CodeGen fields
+    cache_int(ch, g->zig_target.arch.arch);
+    cache_int(ch, g->zig_target.arch.sub_arch);
+    cache_int(ch, g->zig_target.vendor);
+    cache_int(ch, g->zig_target.os);
+    cache_int(ch, g->zig_target.env_type);
+    cache_int(ch, g->zig_target.oformat);
+    cache_bool(ch, g->is_static);
+    cache_bool(ch, g->strip_debug_symbols);
+    cache_bool(ch, g->is_test_build);
+    cache_bool(ch, g->is_native_target);
+    cache_bool(ch, g->windows_subsystem_windows);
+    cache_bool(ch, g->windows_subsystem_console);
+    cache_bool(ch, g->linker_rdynamic);
+    cache_bool(ch, g->no_rosegment_workaround);
+    cache_bool(ch, g->each_lib_rpath);
+    cache_buf_opt(ch, g->mmacosx_version_min);
+    cache_buf_opt(ch, g->mios_version_min);
+    cache_usize(ch, g->version_major);
+    cache_usize(ch, g->version_minor);
+    cache_usize(ch, g->version_patch);
+    cache_buf_opt(ch, g->test_filter);
+    cache_buf_opt(ch, g->test_name_prefix);
+    cache_list_of_str(ch, g->llvm_argv, g->llvm_argv_len);
+    cache_list_of_str(ch, g->clang_argv, g->clang_argv_len);
+    cache_list_of_str(ch, g->lib_dirs.items, g->lib_dirs.length);
 
     buf_resize(digest, 0);
     if ((err = cache_hit(ch, digest)))
@@ -7701,10 +7719,53 @@ static Error check_cache(CodeGen *g, Buf *manifest_dir, Buf *digest) {
     return ErrorNone;
 }
 
-void codegen_build(CodeGen *g) {
+static void resolve_out_paths(CodeGen *g) {
+    Buf *o_basename = buf_create_from_buf(g->root_out_name);
+
+    switch (g->emit_file_type) {
+        case EmitFileTypeBinary:
+        {
+            const char *o_ext = target_o_file_ext(&g->zig_target);
+            buf_append_str(o_basename, o_ext);
+            break;
+        }
+        case EmitFileTypeAssembly:
+        {
+            const char *asm_ext = target_asm_file_ext(&g->zig_target);
+            buf_append_str(o_basename, asm_ext);
+            break;
+        }
+        case EmitFileTypeLLVMIr:
+        {
+            const char *llvm_ir_ext = target_llvm_ir_file_ext(&g->zig_target);
+            buf_append_str(o_basename, llvm_ir_ext);
+            break;
+        }
+        default:
+            zig_unreachable();
+    }
+
+    os_path_join(&g->artifact_dir, o_basename, &g->o_file_output_path);
+
+    if (g->out_type == OutTypeObj) {
+        buf_init_from_buf(&g->output_file_path, &g->o_file_output_path);
+    } else if (g->out_type == OutTypeExe) {
+        assert(g->root_out_name);
+
+        Buf basename = BUF_INIT;
+        buf_init_from_buf(&basename, g->root_out_name);
+        buf_append_str(&basename, target_exe_file_ext(&g->zig_target));
+        os_path_join(&g->artifact_dir, &basename, &g->output_file_path);
+    }
+}
+
+
+void codegen_build_and_link(CodeGen *g) {
     Error err;
     assert(g->out_type != OutTypeUnknown);
 
+    codegen_add_time_event(g, "Check Cache");
+
     Buf app_data_dir = BUF_INIT;
     if ((err = os_get_app_data_dir(&app_data_dir, "zig"))) {
         fprintf(stderr, "Unable to get app data dir: %s\n", err_str(err));
@@ -7721,25 +7782,45 @@ void codegen_build(CodeGen *g) {
         fprintf(stderr, "Unable to check cache: %s\n", err_str(err));
         exit(1);
     }
+
+    Buf *artifact_dir = buf_alloc();
+    os_path_join(stage1_dir, buf_create_from_str("artifact"), artifact_dir);
+
     if (buf_len(&digest) != 0) {
-        Buf *artifact_dir = buf_alloc();
-        os_path_join(stage1_dir, buf_create_from_str("artifact"), artifact_dir);
+        os_path_join(artifact_dir, &digest, &g->artifact_dir);
+        resolve_out_paths(g);
+    } else {
+        init(g);
 
-        Buf *this_artifact_dir = buf_alloc();
-        os_path_join(artifact_dir, &digest, this_artifact_dir);
+        codegen_add_time_event(g, "Semantic Analysis");
 
-        fprintf(stderr, "copy artifacts from %s\n", buf_ptr(this_artifact_dir));
-        return;
-    }
+        gen_global_asm(g);
+        gen_root_source(g);
 
-    init(g);
+        if ((err = cache_final(&g->cache_hash, &digest))) {
+            fprintf(stderr, "Unable to finalize cache hash: %s\n", err_str(err));
+            exit(1);
+        }
+        os_path_join(artifact_dir, &digest, &g->artifact_dir);
+        if ((err = os_make_path(&g->artifact_dir))) {
+            fprintf(stderr, "Unable to create artifact directory: %s\n", err_str(err));
+            exit(1);
+        }
+        resolve_out_paths(g);
 
-    codegen_add_time_event(g, "Semantic Analysis");
+        codegen_add_time_event(g, "Code Generation");
+        do_code_gen(g);
+        if (g->want_h_file) {
+            codegen_add_time_event(g, "Generate .h");
+            gen_h_file(g);
+        }
+        if (g->out_type != OutTypeObj) {
+            codegen_link(g);
+        }
+    }
+    // TODO hard link output_file_path to wanted_output_file_path
 
-    gen_global_asm(g);
-    gen_root_source(g);
-    do_code_gen(g);
-    gen_h_file(g);
+    codegen_add_time_event(g, "Done");
 }
 
 PackageTableEntry *codegen_create_package(CodeGen *g, const char *root_src_dir, const char *root_src_path) {
src/codegen.hpp
@@ -48,9 +48,11 @@ void codegen_set_test_name_prefix(CodeGen *g, Buf *prefix);
 void codegen_set_lib_version(CodeGen *g, size_t major, size_t minor, size_t patch);
 void codegen_set_cache_dir(CodeGen *g, Buf cache_dir);
 void codegen_set_output_h_path(CodeGen *g, Buf *h_path);
+void codegen_set_output_path(CodeGen *g, Buf *path);
 void codegen_add_time_event(CodeGen *g, const char *name);
 void codegen_print_timing_report(CodeGen *g, FILE *f);
-void codegen_build(CodeGen *g);
+void codegen_link(CodeGen *g);
+void codegen_build_and_link(CodeGen *g);
 
 PackageTableEntry *codegen_create_package(CodeGen *g, const char *root_src_dir, const char *root_src_path);
 void codegen_add_assembly(CodeGen *g, Buf *path);
src/error.cpp
@@ -29,6 +29,7 @@ const char *err_str(int err) {
         case ErrorCCompileErrors: return "C compile errors";
         case ErrorEndOfFile: return "end of file";
         case ErrorIsDir: return "is directory";
+        case ErrorUnsupportedOperatingSystem: return "unsupported operating system";
     }
     return "(invalid error)";
 }
src/error.hpp
@@ -29,6 +29,7 @@ enum Error {
     ErrorCCompileErrors,
     ErrorEndOfFile,
     ErrorIsDir,
+    ErrorUnsupportedOperatingSystem,
 };
 
 const char *err_str(int err);
src/ir.cpp
@@ -16232,6 +16232,8 @@ static ZigType *ir_analyze_instruction_union_tag(IrAnalyze *ira, IrInstructionUn
 }
 
 static ZigType *ir_analyze_instruction_import(IrAnalyze *ira, IrInstructionImport *import_instruction) {
+    Error err;
+
     IrInstruction *name_value = import_instruction->name->other;
     Buf *import_target_str = ir_resolve_str(ira, name_value);
     if (!import_target_str)
@@ -16275,8 +16277,7 @@ static ZigType *ir_analyze_instruction_import(IrAnalyze *ira, IrInstructionImpor
         return ira->codegen->builtin_types.entry_namespace;
     }
 
-    int err;
-    if ((err = os_fetch_file_path(resolved_path, import_code, true))) {
+    if ((err = cache_add_file_fetch(&ira->codegen->cache_hash, resolved_path, import_code))) {
         if (err == ErrorFileNotFound) {
             ir_add_error_node(ira, source_node,
                     buf_sprintf("unable to find '%s'", buf_ptr(import_target_path)));
@@ -16287,6 +16288,7 @@ static ZigType *ir_analyze_instruction_import(IrAnalyze *ira, IrInstructionImpor
             return ira->codegen->builtin_types.entry_invalid;
         }
     }
+
     ImportTableEntry *target_import = add_source_file(ira->codegen, target_package, resolved_path, import_code);
 
     scan_import(ira->codegen, target_import);
@@ -18106,7 +18108,7 @@ static ZigType *ir_analyze_instruction_embed_file(IrAnalyze *ira, IrInstructionE
     // load from file system into const expr
     Buf *file_contents = buf_alloc();
     int err;
-    if ((err = os_fetch_file_path(&file_path, file_contents, false))) {
+    if ((err = cache_add_file_fetch(&ira->codegen->cache_hash, &file_path, file_contents))) {
         if (err == ErrorFileNotFound) {
             ir_add_error(ira, instruction->name, buf_sprintf("unable to find '%s'", buf_ptr(&file_path)));
             return ira->codegen->builtin_types.entry_invalid;
@@ -18116,9 +18118,6 @@ static ZigType *ir_analyze_instruction_embed_file(IrAnalyze *ira, IrInstructionE
         }
     }
 
-    // TODO add dependency on the file we embedded so that we know if it changes
-    // we'll have to invalidate the cache
-
     ConstExprValue *out_val = ir_build_const_from(ira, &instruction->base);
     init_const_str_lit(ira->codegen, out_val, file_contents);
 
src/link.cpp
@@ -5,7 +5,6 @@
  * See http://opensource.org/licenses/MIT
  */
 
-#include "link.hpp"
 #include "os.hpp"
 #include "config.h"
 #include "codegen.hpp"
@@ -13,7 +12,6 @@
 
 struct LinkJob {
     CodeGen *codegen;
-    Buf out_file;
     ZigList<const char *> args;
     bool link_in_crt;
     HashMap<Buf *, bool, buf_hash, buf_eql_buf> rpath_table;
@@ -62,14 +60,8 @@ static Buf *build_o_raw(CodeGen *parent_gen, const char *oname, Buf *full_path)
         new_link_lib->provided_explicitly = link_lib->provided_explicitly;
     }
 
-    codegen_build(child_gen);
-    const char *o_ext = target_o_file_ext(&child_gen->zig_target);
-    Buf *o_out_name = buf_sprintf("%s%s", oname, o_ext);
-    Buf *output_path = buf_alloc();
-    os_path_join(&parent_gen->cache_dir, o_out_name, output_path);
-    codegen_link(child_gen, buf_ptr(output_path));
-
-    return output_path;
+    codegen_build_and_link(child_gen);
+    return &child_gen->output_file_path;
 }
 
 static Buf *build_o(CodeGen *parent_gen, const char *oname) {
@@ -237,15 +229,15 @@ static void construct_linker_job_elf(LinkJob *lj) {
     } else if (shared) {
         lj->args.append("-shared");
 
-        if (buf_len(&lj->out_file) == 0) {
-            buf_appendf(&lj->out_file, "lib%s.so.%" ZIG_PRI_usize ".%" ZIG_PRI_usize ".%" ZIG_PRI_usize "",
+        if (buf_len(&g->output_file_path) == 0) {
+            buf_appendf(&g->output_file_path, "lib%s.so.%" ZIG_PRI_usize ".%" ZIG_PRI_usize ".%" ZIG_PRI_usize "",
                     buf_ptr(g->root_out_name), g->version_major, g->version_minor, g->version_patch);
         }
         soname = buf_sprintf("lib%s.so.%" ZIG_PRI_usize "", buf_ptr(g->root_out_name), g->version_major);
     }
 
     lj->args.append("-o");
-    lj->args.append(buf_ptr(&lj->out_file));
+    lj->args.append(buf_ptr(&g->output_file_path));
 
     if (lj->link_in_crt) {
         const char *crt1o;
@@ -397,7 +389,7 @@ static void construct_linker_job_wasm(LinkJob *lj) {
 
     lj->args.append("--relocatable");  // So lld doesn't look for _start.
     lj->args.append("-o");
-    lj->args.append(buf_ptr(&lj->out_file));
+    lj->args.append(buf_ptr(&g->output_file_path));
 
     // .o files
     for (size_t i = 0; i < g->link_objects.length; i += 1) {
@@ -478,7 +470,7 @@ static void construct_linker_job_coff(LinkJob *lj) {
     //    }
     //}
 
-    lj->args.append(buf_ptr(buf_sprintf("-OUT:%s", buf_ptr(&lj->out_file))));
+    lj->args.append(buf_ptr(buf_sprintf("-OUT:%s", buf_ptr(&g->output_file_path))));
 
     if (g->libc_link_lib != nullptr) {
         lj->args.append(buf_ptr(buf_sprintf("-LIBPATH:%s", buf_ptr(g->msvc_lib_dir))));
@@ -585,11 +577,11 @@ static void construct_linker_job_coff(LinkJob *lj) {
             buf_appendf(def_contents, "\n");
 
             Buf *def_path = buf_alloc();
-            os_path_join(&g->cache_dir, buf_sprintf("%s.def", buf_ptr(link_lib->name)), def_path);
+            os_path_join(&g->artifact_dir, buf_sprintf("%s.def", buf_ptr(link_lib->name)), def_path);
             os_write_file(def_path, def_contents);
 
             Buf *generated_lib_path = buf_alloc();
-            os_path_join(&g->cache_dir, buf_sprintf("%s.lib", buf_ptr(link_lib->name)), generated_lib_path);
+            os_path_join(&g->artifact_dir, buf_sprintf("%s.lib", buf_ptr(link_lib->name)), generated_lib_path);
 
             gen_lib_args.resize(0);
             gen_lib_args.append("link");
@@ -797,8 +789,8 @@ static void construct_linker_job_macho(LinkJob *lj) {
             //lj->args.append("-install_name");
             //lj->args.append(buf_ptr(dylib_install_name));
 
-            if (buf_len(&lj->out_file) == 0) {
-                buf_appendf(&lj->out_file, "lib%s.%" ZIG_PRI_usize ".%" ZIG_PRI_usize ".%" ZIG_PRI_usize ".dylib",
+            if (buf_len(&g->output_file_path) == 0) {
+                buf_appendf(&g->output_file_path, "lib%s.%" ZIG_PRI_usize ".%" ZIG_PRI_usize ".%" ZIG_PRI_usize ".dylib",
                     buf_ptr(g->root_out_name), g->version_major, g->version_minor, g->version_patch);
             }
         }
@@ -832,13 +824,13 @@ static void construct_linker_job_macho(LinkJob *lj) {
     }
 
     lj->args.append("-o");
-    lj->args.append(buf_ptr(&lj->out_file));
+    lj->args.append(buf_ptr(&g->output_file_path));
 
     for (size_t i = 0; i < g->rpath_list.length; i += 1) {
         Buf *rpath = g->rpath_list.at(i);
         add_rpath(lj, rpath);
     }
-    add_rpath(lj, &lj->out_file);
+    add_rpath(lj, &g->output_file_path);
 
     if (shared) {
         lj->args.append("-headerpad_max_install_names");
@@ -942,7 +934,8 @@ static void construct_linker_job(LinkJob *lj) {
     }
 }
 
-void codegen_link(CodeGen *g, const char *out_file) {
+void codegen_link(CodeGen *g) {
+    assert(g->out_type != OutTypeObj);
     codegen_add_time_event(g, "Build Dependencies");
 
     LinkJob lj = {0};
@@ -953,11 +946,6 @@ void codegen_link(CodeGen *g, const char *out_file) {
 
     lj.rpath_table.init(4);
     lj.codegen = g;
-    if (out_file) {
-        buf_init_from_str(&lj.out_file, out_file);
-    } else {
-        buf_resize(&lj.out_file, 0);
-    }
 
     if (g->verbose_llvm_ir) {
         fprintf(stderr, "\nOptimization:\n");
@@ -966,35 +954,9 @@ void codegen_link(CodeGen *g, const char *out_file) {
         LLVMDumpModule(g->module);
     }
 
-    bool override_out_file = (buf_len(&lj.out_file) != 0);
-    if (!override_out_file) {
-        assert(g->root_out_name);
-
-        buf_init_from_buf(&lj.out_file, g->root_out_name);
-        if (g->out_type == OutTypeExe) {
-            buf_append_str(&lj.out_file, target_exe_file_ext(&g->zig_target));
-        }
-    }
-
-    if (g->out_type == OutTypeObj) {
-        if (override_out_file) {
-            assert(g->link_objects.length == 1);
-            Buf *o_file_path = g->link_objects.at(0);
-            int err;
-            if ((err = os_rename(o_file_path, &lj.out_file))) {
-                zig_panic("unable to rename object file %s into final output %s: %s", buf_ptr(o_file_path), buf_ptr(&lj.out_file), err_str(err));
-            }
-        }
-        return;
-    }
-
     if (g->out_type == OutTypeLib && g->is_static) {
-        // invoke `ar`
-        // example:
-        // # static link into libfoo.a
-        // ar rcs libfoo.a foo1.o foo2.o
-        zig_panic("TODO invoke ar");
-        return;
+        fprintf(stderr, "Zig does not yet support creating static libraries\nSee https://github.com/ziglang/zig/issues/1493\n");
+        exit(1);
     }
 
     lj.link_in_crt = (g->libc_link_lib != nullptr && g->out_type == OutTypeExe);
@@ -1017,6 +979,4 @@ void codegen_link(CodeGen *g, const char *out_file) {
         fprintf(stderr, "%s\n", buf_ptr(&diag));
         exit(1);
     }
-
-    codegen_add_time_event(g, "Done");
 }
src/link.hpp
@@ -1,17 +0,0 @@
-/*
- * Copyright (c) 2015 Andrew Kelley
- *
- * This file is part of zig, which is MIT licensed.
- * See http://opensource.org/licenses/MIT
- */
-
-#ifndef ZIG_LINK_HPP
-#define ZIG_LINK_HPP
-
-#include "all_types.hpp"
-
-void codegen_link(CodeGen *g, const char *out_file);
-
-
-#endif
-
src/main.cpp
@@ -10,7 +10,6 @@
 #include "codegen.hpp"
 #include "config.h"
 #include "error.hpp"
-#include "link.hpp"
 #include "os.hpp"
 #include "target.hpp"
 #include "cache_hash.hpp"
@@ -385,8 +384,7 @@ int main(int argc, char **argv) {
     CliPkg *cur_pkg = allocate<CliPkg>(1);
     BuildMode build_mode = BuildModeDebug;
     ZigList<const char *> test_exec_args = {0};
-    int comptime_args_end = 0;
-    int runtime_args_start = argc;
+    int runtime_args_start = -1;
     bool no_rosegment_workaround = false;
 
     if (argc >= 2 && strcmp(argv[1], "build") == 0) {
@@ -454,8 +452,6 @@ int main(int argc, char **argv) {
             full_cache_dir = os_path_resolve(&cache_dir_buf, 1);
         }
 
-        Buf *path_to_build_exe = buf_alloc();
-        os_path_join(&full_cache_dir, buf_create_from_str("build"), path_to_build_exe);
         codegen_set_cache_dir(g, full_cache_dir);
 
         args.items[1] = buf_ptr(&build_file_dirname);
@@ -525,14 +521,13 @@ int main(int argc, char **argv) {
         PackageTableEntry *build_pkg = codegen_create_package(g, buf_ptr(&build_file_dirname),
                 buf_ptr(&build_file_basename));
         g->root_package->package_table.put(buf_create_from_str("@build"), build_pkg);
-        codegen_build(g);
-        codegen_link(g, buf_ptr(path_to_build_exe));
+        codegen_build_and_link(g);
 
         Termination term;
-        os_spawn_process(buf_ptr(path_to_build_exe), args, &term);
+        os_spawn_process(buf_ptr(&g->output_file_path), args, &term);
         if (term.how != TerminationIdClean || term.code != 0) {
             fprintf(stderr, "\nBuild failed. The following command failed:\n");
-            fprintf(stderr, "%s", buf_ptr(path_to_build_exe));
+            fprintf(stderr, "%s", buf_ptr(&g->output_file_path));
             for (size_t i = 0; i < args.length; i += 1) {
                 fprintf(stderr, " %s", args.at(i));
             }
@@ -541,15 +536,11 @@ int main(int argc, char **argv) {
         return (term.how == TerminationIdClean) ? term.code : -1;
     }
 
-    for (int i = 1; i < argc; i += 1, comptime_args_end += 1) {
+    for (int i = 1; i < argc; i += 1) {
         char *arg = argv[i];
 
         if (arg[0] == '-') {
-            if (strcmp(arg, "--") == 0) {
-                // ignore -- from both compile and runtime arg sets
-                runtime_args_start = i + 1;
-                break;
-            } else if (strcmp(arg, "--release-fast") == 0) {
+            if (strcmp(arg, "--release-fast") == 0) {
                 build_mode = BuildModeFastRelease;
             } else if (strcmp(arg, "--release-safe") == 0) {
                 build_mode = BuildModeSafeRelease;
@@ -746,6 +737,10 @@ int main(int argc, char **argv) {
                 case CmdTest:
                     if (!in_file) {
                         in_file = arg;
+                        if (cmd == CmdRun) {
+                            runtime_args_start = i + 1;
+                            break; // rest of the args are for the program
+                        }
                     } else {
                         fprintf(stderr, "Unexpected extra parameter: %s\n", arg);
                         return usage(arg0);
@@ -856,19 +851,10 @@ int main(int argc, char **argv) {
             Buf *zig_root_source_file = (cmd == CmdTranslateC) ? nullptr : in_file_buf;
 
             Buf full_cache_dir = BUF_INIT;
-            Buf *run_exec_path = buf_alloc();
-            if (cmd == CmdRun) {
-                if (buf_out_name == nullptr) {
-                    buf_out_name = buf_create_from_str("run");
-                }
-
-                Buf *global_cache_dir = buf_alloc();
-                os_get_global_cache_directory(global_cache_dir);
-                os_path_join(global_cache_dir, buf_out_name, run_exec_path);
-                full_cache_dir = os_path_resolve(&global_cache_dir, 1);
-
-                out_file = buf_ptr(run_exec_path);
-            } else {
+            if (cmd == CmdRun && buf_out_name == nullptr) {
+                buf_out_name = buf_create_from_str("run");
+            }
+            {
                 Buf *resolve_paths = buf_create_from_str((cache_dir == nullptr) ? default_zig_cache_name : cache_dir);
                 full_cache_dir = os_path_resolve(&resolve_paths, 1);
             }
@@ -957,6 +943,8 @@ int main(int argc, char **argv) {
                 codegen_set_test_name_prefix(g, buf_create_from_str(test_name_prefix));
             }
 
+            if (out_file)
+                codegen_set_output_path(g, buf_create_from_str(out_file));
             if (out_file_h)
                 codegen_set_output_h_path(g, buf_create_from_str(out_file_h));
 
@@ -976,8 +964,7 @@ int main(int argc, char **argv) {
             if (cmd == CmdBuild || cmd == CmdRun) {
                 codegen_set_emit_file_type(g, emit_file_type);
 
-                codegen_build(g);
-                codegen_link(g, out_file);
+                codegen_build_and_link(g);
                 if (timing_info)
                     codegen_print_timing_report(g, stdout);
 
@@ -987,8 +974,14 @@ int main(int argc, char **argv) {
                         args.append(argv[i]);
                     }
 
+                    const char *exec_path = buf_ptr(&g->output_file_path);
+                    args.append(nullptr);
+
+                    os_execv(exec_path, args.items);
+
+                    args.pop();
                     Termination term;
-                    os_spawn_process(buf_ptr(run_exec_path), args, &term);
+                    os_spawn_process(exec_path, args, &term);
                     return term.code;
                 }
 
@@ -1005,11 +998,8 @@ int main(int argc, char **argv) {
                 ZigTarget native;
                 get_native_target(&native);
 
-                ZigTarget *non_null_target = target ? target : &native;
-
-                Buf *test_exe_name = buf_sprintf("test%s", target_exe_file_ext(non_null_target));
-                Buf *test_exe_path = buf_alloc();
-                os_path_join(&full_cache_dir, test_exe_name, test_exe_path);
+                codegen_build_and_link(g);
+                Buf *test_exe_path = &g->output_file_path;
 
                 for (size_t i = 0; i < test_exec_args.length; i += 1) {
                     if (test_exec_args.items[i] == nullptr) {
@@ -1017,8 +1007,6 @@ int main(int argc, char **argv) {
                     }
                 }
 
-                codegen_build(g);
-                codegen_link(g, buf_ptr(test_exe_path));
 
                 if (!target_can_exec(&native, target)) {
                     fprintf(stderr, "Created %s but skipping execution because it is non-native.\n",
src/os.cpp
@@ -972,6 +972,22 @@ static int os_exec_process_windows(const char *exe, ZigList<const char *> &args,
 }
 #endif
 
+Error os_execv(const char *exe, const char **argv) {
+#if defined(ZIG_OS_WINDOWS)
+    return ErrorUnsupportedOperatingSystem;
+#else
+    execv(exe, (char *const *)argv);
+    switch (errno) {
+        case ENOMEM:
+            return ErrorSystemResources;
+        case EIO:
+            return ErrorFileSystem;
+        default:
+            return ErrorUnexpected;
+    }
+#endif
+}
+
 int os_exec_process(const char *exe, ZigList<const char *> &args,
         Termination *term, Buf *out_stderr, Buf *out_stdout)
 {
@@ -1238,44 +1254,6 @@ int os_buf_to_tmp_file(Buf *contents, Buf *suffix, Buf *out_tmp_path) {
 #endif
 }
 
-#if defined(ZIG_OS_POSIX)
-int os_get_global_cache_directory(Buf *out_tmp_path) {
-    const char *tmp_dir = getenv("TMPDIR");
-    if (!tmp_dir) {
-        tmp_dir = P_tmpdir;
-    }
-
-    Buf *tmp_dir_buf = buf_create_from_str(tmp_dir);
-    Buf *cache_dirname_buf = buf_create_from_str("zig-cache");
-
-    buf_resize(out_tmp_path, 0);
-    os_path_join(tmp_dir_buf, cache_dirname_buf, out_tmp_path);
-
-    buf_deinit(tmp_dir_buf);
-    buf_deinit(cache_dirname_buf);
-    return 0;
-}
-#endif
-
-#if defined(ZIG_OS_WINDOWS)
-int os_get_global_cache_directory(Buf *out_tmp_path) {
-    char tmp_dir[MAX_PATH + 1];
-    if (GetTempPath(MAX_PATH, tmp_dir) == 0) {
-        zig_panic("GetTempPath failed");
-    }
-
-    Buf *tmp_dir_buf = buf_create_from_str(tmp_dir);
-    Buf *cache_dirname_buf = buf_create_from_str("zig-cache");
-
-    buf_resize(out_tmp_path, 0);
-    os_path_join(tmp_dir_buf, cache_dirname_buf, out_tmp_path);
-
-    buf_deinit(tmp_dir_buf);
-    buf_deinit(cache_dirname_buf);
-    return 0;
-}
-#endif
-
 int os_delete_file(Buf *path) {
     if (remove(buf_ptr(path))) {
         return ErrorFileSystem;
src/os.hpp
@@ -87,6 +87,7 @@ int os_init(void);
 void os_spawn_process(const char *exe, ZigList<const char *> &args, Termination *term);
 int os_exec_process(const char *exe, ZigList<const char *> &args,
         Termination *term, Buf *out_stderr, Buf *out_stdout);
+Error os_execv(const char *exe, const char **argv);
 
 void os_path_dirname(Buf *full_path, Buf *out_dirname);
 void os_path_split(Buf *full_path, Buf *out_dirname, Buf *out_basename);
@@ -96,8 +97,6 @@ int os_path_real(Buf *rel_path, Buf *out_abs_path);
 Buf os_path_resolve(Buf **paths_ptr, size_t paths_len);
 bool os_path_is_absolute(Buf *path);
 
-int os_get_global_cache_directory(Buf *out_tmp_path);
-
 Error ATTRIBUTE_MUST_USE os_make_path(Buf *path);
 Error ATTRIBUTE_MUST_USE os_make_dir(Buf *path);