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
26 lines
1021 B
C++
26 lines
1021 B
C++
// RUN: %clang_cc1 -fgnuc-version=4.2.1 -std=gnu++98 -E -dM %s | FileCheck --check-prefix=CHECK-GNU-COMPAT-98 %s
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// RUN: %clang_cc1 -fgnuc-version=4.2.1 -std=gnu++11 -E -dM %s | FileCheck --check-prefix=CHECK-GNU-COMPAT-11 %s
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// RUN: %clang_cc1 -fgnuc-version=4.2.1 -std=c++98 -E -dM %s | FileCheck --check-prefix=CHECK-CONFORMING %s
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// RUN: %clang_cc1 -fgnuc-version=4.2.1 -fsyntax-only -std=gnu++98 -verify -Weverything %s
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#include <stdbool.h>
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#define zzz
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// CHECK-GNU-COMPAT-98: #define _Bool bool
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// CHECK-GNU-COMPAT-98: #define bool bool
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// CHECK-GNU-COMPAT-98: #define false false
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// CHECK-GNU-COMPAT-98: #define true true
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// CHECK-GNU-COMPAT-11: #define _Bool bool
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// CHECK-GNU-COMPAT-11-NOT: #define bool bool
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// CHECK-GNU-COMPAT-11-NOT: #define false false
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// CHECK-GNU-COMPAT-11-NOT: #define true true
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// CHECK-CONFORMING-NOT: #define _Bool
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// CHECK-CONFORMING: #define __CHAR_BIT__
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// CHECK-CONFORMING-NOT: #define false false
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// CHECK-CONFORMING: #define zzz
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zzz
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// expected-no-diagnostics
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extern bool x;
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