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Summary:
The main effect is that clang now accepts the following conforming C11
code with MSVC headers:
#include <assert.h>
static_assert(1, "true");
This is a non-conforming extension (the keyword is outside the
implementer's namespace), so it is placed under -fms-compatibility
instead of -fms-extensions like most MSVC-specific keyword extensions.
Normally, in C11, the compiler is supposed to provide the _Static_assert
keyword, and assert.h should define static_assert to _Static_assert.
However, that is not what MSVC does, and MSVC doesn't even provide
_Static_assert.
This also has the less important side effect of enabling static_assert
in C++98 mode with -fms-compatibility. It's exceptionally difficult to
use modern MSVC headers without C++14 even, so this is relatively
unimportant.
Fixes PR26672
Patch by Andrey Bokhanko!
Reviewers: rsmith, thakis
Subscribers: cfe-commits, STL_MSFT
Differential Revision: https://reviews.llvm.org/D17444
llvm-svn: 354162
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In versions of clang prior to r238238, __declspec was recognized as a keyword in
all modes. It was then changed to only be enabled when Microsoft or Borland
extensions were enabled (and for CUDA, as a temporary measure). There is a
desire to support __declspec in Playstation code, and possibly other
environments. This commit adds a command-line switch to allow explicit
enabling/disabling of the recognition of __declspec as a keyword. Recognition
is enabled by default in Microsoft, Borland, CUDA, and PS4 environments, and
disabled in all other environments.
Patch by Warren Ristow!
llvm-svn: 249279
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The -fms-extensions option affects a number of subtle front-end C/C++
behaviors, and it would be useful to be able to distinguish MS keywords
from regular identifiers in the ms-extensions mode even if the triple
does not define a Windows target. It should make life easier if anyone
needs to port their Windows codes to elsewhere.
Differential Revision: http://reviews.llvm.org/D3034
llvm-svn: 206069
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