Commit 02438aabe3

@@ -256,11 +256,17 @@ pub fn build(b: *Builder) !void {
                     std.process.exit(1);
                 }
 
+                // Check that the commit hash is prefixed with a 'g' (a Git convention).
+                if (commit_id.len < 1 or commit_id[0] != 'g') {
+                    std.debug.print("Unexpected `git describe` output: {}\n", .{git_describe});
+                    break :v version_string;
+                }
+
                 // The version is reformatted in accordance with the https://semver.org specification.
-                break :v b.fmt("{}-dev.{}+{}", .{ version_string, commit_height, commit_id });
+                break :v b.fmt("{}-dev.{}+{}", .{ version_string, commit_height, commit_id[1..] });
             },
             else => {
-                std.debug.print("Failed to parse `git describe` output: {}\n", .{git_describe});
+                std.debug.print("Unexpected `git describe` output: {}\n", .{git_describe});
                 break :v version_string;
             },
         }

@@ -46,7 +46,7 @@ if("${ZIG_VERSION}" STREQUAL "")
                 if(NOT GIT_TAG VERSION_EQUAL ZIG_VERSION)
                     message(SEND_ERROR "Zig version (${ZIG_VERSION}) does not match Git tag (${GIT_TAG}).")
                 endif()
-            elseif(GIT_DESCRIBE MATCHES "^v?([0-9]+\\.[0-9]+\\.[0-9]+)-([0-9]+)-(.+)$")
+            elseif(GIT_DESCRIBE MATCHES "^v?([0-9]+\\.[0-9]+\\.[0-9]+)-([0-9]+)-g(.+)$")
                 # Untagged pre-release. The Zig version is updated to include the number of commits
                 # since the last tagged version and the commit hash. The version is formatted in
                 # accordance with the https://semver.org specification.