Bugzilla Link	48904
Resolution	FIXED
Resolved on	Jan 29, 2021 22:22
Version	unspecified
OS	Windows NT
Blocks	#48246
Attachments	reduced test-case
Reporter	LLVM Bugzilla Contributor
CC	@nico,@zygoloid,@tstellar
Fixed by commit(s)	764a7a2 8c5d184

Extended Description

The clang-cl compiler disallows C11 convenience macro static_assert in the function scope. It does allow static_assert in the file scope.

This problem is also reported in ionescu007/minlzma#1.

Here is a reduced test-case:

C:\src\build>clang-cl --version
clang version 12.0.0 (https://github.com/llvm/llvm-project/ 6de4865)
Target: x86_64-pc-windows-msvc
Thread model: posix
InstalledDir: C:\src\chromium\src\third_party\llvm-build\Release+Asserts\bin

C:\src\build>type static-assert.c
#include <assert.h>

_Static_assert(1 == 1, "");
static_assert(1 == 1, "");

void Foo(void) {
_Static_assert(1 == 1, "");
static_assert(1 == 1, "");
}
C:\src\build>clang-cl /s static-assert.c
clang-cl: error: no such file or directory: '/s'

C:\src\aom.1\build.clang-cl>clang-cl /c static-assert.c
static-assert.c(8,3): error: expected expression
static_assert(1 == 1, "");
^
1 error generated.