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| author | Paul E. Murphy <murphyp@linux.vnet.ibm.com> | 2020-03-06 09:41:03 -0600 |
|---|---|---|
| committer | Paul E. Murphy <murphyp@linux.vnet.ibm.com> | 2020-04-30 08:52:08 -0500 |
| commit | 86005fdbf40d6fc84d84c824d75c656e7c1398e3 (patch) | |
| tree | f2db5cb76956d7bcedeb4e6b721dfa18f4ce367d /include/stdlib.h | |
| parent | ab54e26415ea82444a9529041427137bf27c615c (diff) | |
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ldbl-128ibm-compat: workaround GCC 9 C++ PR90731
GCC 9 has a bug (PR90731) whereby __typeof does not correctly copy
exception specifiers[1]. Surprisingly, this can be quieted by declaring
"#pragma system_header", or if the headers are installed in a system
directory.
Work around this by using the pragma for any gcc version between
9.0 and 9.2 to ensure tests continue to compile.
[1] Example error from g++ 9.2.1:
In file included from ../include/sys/cdefs.h:3,
from ../include/features.h:465,
from ../bits/libc-header-start.h:33,
from ../math/math.h:27,
from ../include/math.h:7,
from test-math-isinff.cc:21:
../libio/bits/stdio-ldbl.h:25:20: error: declaration of ‘int sprintf(char*, const char*, ...)’ has a different exception specifier
25 | __LDBL_REDIR_DECL (sprintf)
| ^~~~~~~
../misc/sys/cdefs.h:461:26: note: in definition of macro ‘__LDBL_REDIR_DECL’
461 | extern __typeof (name) name __asm (__ASMNAME ("__" #name "ieee128"));
| ^~~~
In file included from ../include/stdio.h:5,
from test-math-isinff.cc:22:
../libio/stdio.h:334:12: note: from previous declaration ‘int sprintf(char*, const char*, ...) throw ()’
334 | extern int sprintf (char *__restrict __s,
| ^~~~~~~
Reviewed-by: Tulio Magno Quites Machado Filho <tuliom@linux.ibm.com>
Diffstat (limited to 'include/stdlib.h')
| -rw-r--r-- | include/stdlib.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/include/stdlib.h b/include/stdlib.h index 926f965f69..187a41e754 100644 --- a/include/stdlib.h +++ b/include/stdlib.h @@ -3,6 +3,15 @@ #ifndef _ISOMAC # include <stddef.h> #endif + +/* Workaround PR90731 with GCC 9 when using ldbl redirects in C++. */ +#include <bits/floatn.h> +#if defined __cplusplus && __LONG_DOUBLE_USES_FLOAT128 == 1 +# if __GNUC_PREREQ (9, 0) && !__GNUC_PREREQ (9, 3) +# pragma GCC system_header +# endif +#endif + #include <stdlib/stdlib.h> /* Now define the internal interfaces. */ |