5e866e411c
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
27 lines
1.3 KiB
C
27 lines
1.3 KiB
C
//
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// Verify -fgnuc-version parsing
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//
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// RUN: %clang -c %s -target i686-linux -### 2>&1 | FileCheck %s -check-prefix GNUC-DEFAULT
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// GNUC-DEFAULT: "-fgnuc-version=4.2.1"
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// RUN: %clang -c %s -target i686-linux -fgnuc-version=100.99.99 -### 2>&1 | FileCheck %s -check-prefix GNUC-OVERRIDE
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// GNUC-OVERRIDE: "-fgnuc-version=100.99.99"
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// RUN: %clang -c %s -target i686-linux -fgnuc-version=0 -### 2>&1 | FileCheck %s -check-prefix GNUC-DISABLE
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// RUN: %clang -c %s -target i686-linux -fgnuc-version= -### 2>&1 | FileCheck %s -check-prefix GNUC-DISABLE
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// GNUC-DISABLE-NOT: "-fgnuc-version=
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// RUN: not %clang -c %s -target i686-linux -fgnuc-version=100.100.10 2>&1 | FileCheck %s -check-prefix GNUC-INVALID
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// RUN: not %clang -c %s -target i686-linux -fgnuc-version=100.10.100 2>&1 | FileCheck %s -check-prefix GNUC-INVALID
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// RUN: not %clang -c %s -target i686-linux -fgnuc-version=-1.0.0 2>&1 | FileCheck %s -check-prefix GNUC-INVALID
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// GNUC-INVALID: error: invalid value {{.*}} in '-fgnuc-version={{.*}}'
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// RUN: %clang -fgnuc-version=100.99.99 %s -dM -E -o - | FileCheck %s -check-prefix GNUC-LARGE
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// GNUC-LARGE: #define __GNUC_MINOR__ 99
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// GNUC-LARGE: #define __GNUC_PATCHLEVEL__ 99
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// GNUC-LARGE: #define __GNUC__ 100
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// RUN: %clang -fgnuc-version=100.99.99 -x c++ %s -dM -E -o - | FileCheck %s -check-prefix GXX-LARGE
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// GXX-LARGE: #define __GNUG__ 100
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