maxjhandsome
/
llvm-project
forked from OSchip/llvm-project
1
0
Fork 0
Code Issues Pull Requests Packages Releases Wiki Activity
llvm-project/clang/test/Driver/fgnuc-version.c

Ignoring revisions in .git-blame-ignore-revs. Click here to bypass and see the normal blame view.

27 lines
1.3 KiB
C
Raw Normal View History

Add -fgnuc-version= to control __GNUC__ and other GCC macros I noticed that compiling on Windows with -fno-ms-compatibility had the side effect of defining __GNUC__, along with __GNUG__, __GXX_RTTI__, and a number of other macros for GCC compatibility. This is undesirable and causes Chromium to do things like mix __attribute__ and __declspec, which doesn't work. We should have a positive language option to enable GCC compatibility features so that we can experiment with -fno-ms-compatibility on Windows. This change adds -fgnuc-version= to be that option. My issue aside, users have, for a long time, reported that __GNUC__ doesn't match their expectations in one way or another. We have encouraged users to migrate code away from this macro, but new code continues to be written assuming a GCC-only environment. There's really nothing we can do to stop that. By adding this flag, we can allow them to choose their own adventure with __GNUC__. This overlaps a bit with the "GNUMode" language option from -std=gnu*. The gnu language mode tends to enable non-conforming behaviors that we'd rather not enable by default, but the we want to set things like __GXX_RTTI__ by default, so I've kept these separate. Helps address PR42817 Reviewed By: hans, nickdesaulniers, MaskRay Differential Revision: https://reviews.llvm.org/D68055 llvm-svn: 374449
2019-10-11 05:04:25 +08:00
//
// Verify -fgnuc-version parsing
//
// RUN: %clang -c %s -target i686-linux -### 2>&1 | FileCheck %s -check-prefix GNUC-DEFAULT
// GNUC-DEFAULT: "-fgnuc-version=4.2.1"
// RUN: %clang -c %s -target i686-linux -fgnuc-version=100.99.99 -### 2>&1 | FileCheck %s -check-prefix GNUC-OVERRIDE
// GNUC-OVERRIDE: "-fgnuc-version=100.99.99"
// RUN: %clang -c %s -target i686-linux -fgnuc-version=0 -### 2>&1 | FileCheck %s -check-prefix GNUC-DISABLE
// RUN: %clang -c %s -target i686-linux -fgnuc-version= -### 2>&1 | FileCheck %s -check-prefix GNUC-DISABLE
// GNUC-DISABLE-NOT: "-fgnuc-version=
// RUN: not %clang -c %s -target i686-linux -fgnuc-version=100.100.10 2>&1 | FileCheck %s -check-prefix GNUC-INVALID
// RUN: not %clang -c %s -target i686-linux -fgnuc-version=100.10.100 2>&1 | FileCheck %s -check-prefix GNUC-INVALID
// RUN: not %clang -c %s -target i686-linux -fgnuc-version=-1.0.0 2>&1 | FileCheck %s -check-prefix GNUC-INVALID
// GNUC-INVALID: error: invalid value {{.*}} in '-fgnuc-version={{.*}}'
// RUN: %clang -fgnuc-version=100.99.99 %s -dM -E -o - | FileCheck %s -check-prefix GNUC-LARGE
// GNUC-LARGE: #define __GNUC_MINOR__ 99
// GNUC-LARGE: #define __GNUC_PATCHLEVEL__ 99
// GNUC-LARGE: #define __GNUC__ 100
// RUN: %clang -fgnuc-version=100.99.99 -x c++ %s -dM -E -o - | FileCheck %s -check-prefix GXX-LARGE
// GXX-LARGE: #define __GNUG__ 100