From 8caa20641787944651f7c6fe2f664e93c55d79ec Mon Sep 17 00:00:00 2001
From: Andrew Kelley <andrew@ziglang.org>
Date: Tue, 14 Jun 2022 15:27:43 -0700
Subject: [PATCH] test-cases: fix race with `zig run` on C backend tests

Also avoid redundantly doing compile-error checks on multiple targets
for test cases where that is not helpful.
---
 src/test.zig                                               | 7 ++++++-
 test/cases/compile_errors/dereference_anyopaque.zig        | 1 +
 test/cases/compile_errors/invalid_array_elem_ty.zig        | 3 ++-
 .../compile_errors/invalid_store_to_comptime_field.zig     | 3 ++-
 .../compile_errors/runtime_indexing_comptime_array.zig     | 3 ++-
 test/cases/compile_errors/stage2/comptime_unreachable.zig  | 2 ++
 6 files changed, 15 insertions(+), 4 deletions(-)

diff --git a/src/test.zig b/src/test.zig
index f8b8ed8ce8..414a9d4d82 100644
--- a/src/test.zig
+++ b/src/test.zig
@@ -1808,6 +1808,11 @@ pub const TestContext = struct {
                                 // We wouldn't be able to run the compiled C code.
                                 return; // Pass test.
                             }
+                            // Use an absolute path here so that the unique directory name
+                            // for this Case makes it into the cache hash, avoiding cache
+                            // collisions from multiple threads doing `zig run` at the same
+                            // time on the same test_case.c input filename.
+                            const abs_exe_path = try tmp.dir.realpathAlloc(arena, bin_name);
                             try argv.appendSlice(&[_][]const u8{
                                 std.testing.zig_exe_path,
                                 "run",
@@ -1818,7 +1823,7 @@ pub const TestContext = struct {
                                 "-Wno-incompatible-library-redeclaration", // https://github.com/ziglang/zig/issues/875
                                 "--",
                                 "-lc",
-                                exe_path,
+                                abs_exe_path,
                             });
                         } else switch (host.getExternalExecutor(target_info, .{ .link_libc = case.link_libc })) {
                             .native => try argv.append(exe_path),
diff --git a/test/cases/compile_errors/dereference_anyopaque.zig b/test/cases/compile_errors/dereference_anyopaque.zig
index 68be3c97ed..e09f086016 100644
--- a/test/cases/compile_errors/dereference_anyopaque.zig
+++ b/test/cases/compile_errors/dereference_anyopaque.zig
@@ -41,6 +41,7 @@ pub export fn entry() void {
 }
 
 // error
+// target=native
 // backend=llvm
 //
 // :11:22: error: comparison of 'void' with null
diff --git a/test/cases/compile_errors/invalid_array_elem_ty.zig b/test/cases/compile_errors/invalid_array_elem_ty.zig
index bfa79a104b..c7c2597246 100644
--- a/test/cases/compile_errors/invalid_array_elem_ty.zig
+++ b/test/cases/compile_errors/invalid_array_elem_ty.zig
@@ -6,6 +6,7 @@ pub export fn entry() void {
 }
 
 // error
-// backend=stage2,llvm
+// target=native
+// backend=stage2
 //
 // :4:1: error: expected type, found fn() type
diff --git a/test/cases/compile_errors/invalid_store_to_comptime_field.zig b/test/cases/compile_errors/invalid_store_to_comptime_field.zig
index 3bbd9bbaa8..48743f3ba1 100644
--- a/test/cases/compile_errors/invalid_store_to_comptime_field.zig
+++ b/test/cases/compile_errors/invalid_store_to_comptime_field.zig
@@ -14,7 +14,8 @@ pub export fn entry1() void {
     s.a = T{ .a = 2, .b = 2 };
 }
 // error
-// backend=stage2,llvm
+// target=native
+// backend=stage2
 //
 // :6:19: error: value stored in comptime field does not match the default value of the field
 // :14:19: error: value stored in comptime field does not match the default value of the field
diff --git a/test/cases/compile_errors/runtime_indexing_comptime_array.zig b/test/cases/compile_errors/runtime_indexing_comptime_array.zig
index 3acd0feb61..16f7305f63 100644
--- a/test/cases/compile_errors/runtime_indexing_comptime_array.zig
+++ b/test/cases/compile_errors/runtime_indexing_comptime_array.zig
@@ -21,7 +21,8 @@ pub export fn entry3() void {
     _ = &test_fns[i];
 }
 // error
-// backend=stage2,llvm
+// target=native
+// backend=stage2
 //
 // :6:5: error: values of type '[2]fn() void' must be comptime known, but index value is runtime known
 // :6:5: note: use '*const fn() void' for a function pointer type
diff --git a/test/cases/compile_errors/stage2/comptime_unreachable.zig b/test/cases/compile_errors/stage2/comptime_unreachable.zig
index 6086dd85c6..74b3516585 100644
--- a/test/cases/compile_errors/stage2/comptime_unreachable.zig
+++ b/test/cases/compile_errors/stage2/comptime_unreachable.zig
@@ -3,5 +3,7 @@ pub export fn entry() void {
 }
 
 // error
+// target=native
+// backend=stage2
 //
 // :2:14: error: reached unreachable code