https://bugs.llvm.org/show_bug.cgi?id=52577
Bug ID: 52577
Summary: Signaling NaNs are seem supported but __SUPPORT_SNAN__
is not defined
Product: clang
Version: 13.0
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
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
Note: this may not be a bug, but the subject needs a clarification.
This code:
#define _WANT_SNAN
#ifdef __SUPPORT_SNAN__
#pragma message "__SUPPORT_SNAN__ is defined"
#else
#pragma message "__SUPPORT_SNAN__ is not defined"
#endif
compiled with:
$ clang -std=c11 -pedantic -Wall -Wextra -ffp-model=strict -c
leads to:
<source>:5:9: warning: __SUPPORT_SNAN__ is not defined [-W#pragma-messages]
However, according to some tests signaling NaNs are supported.
Then what is the real reason to not define __SUPPORT_SNAN__?
It may be useful to mention the status of support of signaling NaNs in User's
Manual: https://clang.llvm.org/docs/UsersManual.html.
Version: clang 13.0.0 on x86_64 on Linux
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