zig test: forward target CLI args to zig run when using -ofmt=c

Previously, if you used `zig test -ofmt=c -target foobar` then Zig would
try to compile the generated C code with the native target instead of
"foobar".

With this change, `--test-cmd` with e.g. QEMU still won't work, but at
least the binary will get compiled for the correct target.

1 files changed, 11 insertions, 0 deletions

diff --git a/src/main.zig b/src/main.zig
index 6bde852eee..762735dd8b 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -3021,6 +3021,17 @@ fn buildOutputType(
         try test_exec_args.append(self_exe_path);
         try test_exec_args.append("run");
         if (link_libc) try test_exec_args.append("-lc");
+        if (!mem.eql(u8, target_arch_os_abi, "native")) {
+            try test_exec_args.append("-target");
+            try test_exec_args.append(target_arch_os_abi);
+        }
+        if (target_mcpu) |mcpu| {
+            try test_exec_args.append(try std.fmt.allocPrint(arena, "-mcpu={s}", .{mcpu}));
+        }
+        if (target_dynamic_linker) |dl| {
+            try test_exec_args.append("--dynamic-linker");
+            try test_exec_args.append(dl);
+        }
         try test_exec_args.append(c_code_path);
     }