Adjust #pragma warning so GCC is not unhappy

[rogfer01]

Summary

In https://github.com/llvm/llvm-project/commit/d768bf994f508d7eaf9541a568be3d71096febf5 a warning to help transitioning was added to llvm/Support/Host.h but it includes extra parentheses which make GCC unhappy (clang seems to accept them fine)

llvm/include/llvm/Support/Host.h:15:20: error: invalid "#pragma GCC warning" directive
   15 | #pragma GCC warning(                                                           \
      |                    ^

This change removes the parentheses around the string literal.

[lenary]

Which configurations are still using this? Just Polly (via isl), or others too?

[rogfer01]

In D143885#4122115, @lenary wrote:

Which configurations are still using this? Just Polly (via isl), or others too?

flang still uses this header.

[rogfer01]

flang still uses this header.

Apologies, it doesn't. Turns out a branch of mine does and then GCC failed to build it.

[lenary]

In D143885#4122133, @rogfer01 wrote:

In D143885#4122115, @lenary wrote:

Which configurations are still using this? Just Polly (via isl), or others too?

flang still uses this header.

Ok, well, I can't see uses of llvm/Support/Host.h in the flang directory, but we need this so that polly can build isl, so don't see these comments as being against you landing this.

[rogfer01]

Thanks for double checking, I'll land it soon.

llvm/include/llvm/Support/Host.h

 //===-- llvm/Support/Host.h -------------------------------------*- C++ -*-===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
 /// This header is deprecated in favour of `llvm/TargetParser/Host.h`.
 ///
 //===----------------------------------------------------------------------===//
 
 #ifdef __GNUC__
-#pragma GCC warning(                                                           \
-    "This header is deprecated, please use llvm/TargetParser/Host.h")
+#pragma GCC warning                                                            \
+    "This header is deprecated, please use llvm/TargetParser/Host.h"
 #endif
 #include "llvm/TargetParser/Host.h"