https://bugs.llvm.org/show_bug.cgi?id=52533
Bug ID: 52533
Summary: __STDC_IEC_559__ depends on #include <stdio.h>:
confused
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: C
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected], [email protected],
[email protected]
Note: this may not be a bug. However, it is expected that __STDC_IEC_559__ does
not depend on any #include and stays constant during the translation.
This code:
#include FNAME
#if __STDC_IEC_559__ == 1
#pragma message "__STDC_IEC_559__ is 1"
#else
#pragma message "__STDC_IEC_559__ is not 1"
#endif
compiled with:
$ clang t0.c -std=c11 -pedantic -Wall -Wextra -DFNAME="<stdio.h>"
leads to:
t0.c:3:9: warning: __STDC_IEC_559__ is 1 [-W#pragma-messages]
while compiled with:
$ clang t0.c -std=c11 -pedantic -Wall -Wextra -DFNAME="<float.h>"
leads to:
t0.c:3:9: warning: __STDC_IEC_559__ is not 1 [-W#pragma-messages]
Here we see that the value of __STDC_IEC_559__ depends on #include. Which is
confusing. Please explain / investigate.
Version: clang 13.0.0 on Linux on x86_64
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