https://bugs.llvm.org/show_bug.cgi?id=50694
Bug ID: 50694
Summary: Clang on Windows: MSVC compatibility: #pragma
fenv_access is not supported
Product: clang
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: C
Assignee: unassignedclangb...@nondot.org
Reporter: pavel.moroz...@gmail.com
CC: blitzrak...@gmail.com, dgre...@apple.com,
erik.pilking...@gmail.com, llvm-bugs@lists.llvm.org,
richard-l...@metafoo.co.uk
MSVC does not support #pragma STDC FENV_ACCESS ON:
cl t125.c /std:c11
t125.c(11): warning C4068: unknown pragma 'STDC'
Instead MSVC does support #pragma fenv_access (on). This leads to this code:
#if _MSC_VER
#pragma fenv_access (on)
#else
#pragma STDC FENV_ACCESS ON
#endif
Now try to compile this code using the latest Clang on Windows:
$ /cygdrive/d/SOFTWARE/LLVM/12.0.0/bin/clang t125.c -Wall -Wextra
t125.c:10:9: warning: unknown pragma ignored [-Wunknown-pragmas]
#pragma fenv_access (on)
Meaning that since #pragma fenv_access (on) is unknown pragma which is ignored,
then the MSVC compatibility is underdone / unfinished? Confused.
For Clang on Windows with MSVC compatibility enabled: please add support of
#pragma fenv_access.
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