Commit 336ddb8011

@@ -75,6 +75,7 @@ static int print_full_usage(const char *arg0, FILE *file, int return_code) {
         "  -dynamic                     create a shared library (.so; .dll; .dylib)\n"
         "  --strip                      exclude debug symbols\n"
         "  -target [name]               <arch><sub>-<os>-<abi> see the targets command\n"
+        "  -target-glibc [version]      target a specific glibc version (default: 2.17)\n"
         "  --verbose-tokenize           enable compiler debug output for tokenization\n"
         "  --verbose-ast                enable compiler debug output for AST parsing\n"
         "  --verbose-link               enable compiler debug output for linking\n"

@@ -1053,7 +1053,8 @@ pub const LibExeObjStep = struct {
     installed_path: ?[]const u8,
     install_step: ?*InstallArtifactStep,
 
-    libc_file: ?[]const u8,
+    libc_file: ?[]const u8 = null,
+    target_glibc: ?Version = null,
 
     const LinkObject = union(enum) {
         StaticPath: []const u8,
@@ -1148,7 +1149,6 @@ pub const LibExeObjStep = struct {
             .single_threaded = false,
             .installed_path = null,
             .install_step = null,
-            .libc_file = null,
         };
         self.computeOutFileNames();
         return self;
@@ -1220,6 +1220,14 @@ pub const LibExeObjStep = struct {
         self.computeOutFileNames();
     }
 
+    pub fn setTargetGLibC(self: *LibExeObjStep, major: u32, minor: u32, patch: u32) void {
+        self.target_glibc = Version{
+            .major = major,
+            .minor = minor,
+            .patch = patch,
+        };
+    }
+
     pub fn setOutputDir(self: *LibExeObjStep, dir: []const u8) void {
         self.output_dir = self.builder.dupe(dir);
     }
@@ -1581,6 +1589,11 @@ pub const LibExeObjStep = struct {
             },
         }
 
+        if (self.target_glibc) |ver| {
+            try zig_args.append("-target-glibc");
+            try zig_args.append(builder.fmt("{}.{}.{}", ver.major, ver.minor, ver.patch));
+        }
+
         if (self.linker_script) |linker_script| {
             zig_args.append("--linker-script") catch unreachable;
             zig_args.append(linker_script) catch unreachable;