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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/stdio.h | |
| parent | ab54e26415ea82444a9529041427137bf27c615c (diff) | |
| download | glibc-86005fdbf40d6fc84d84c824d75c656e7c1398e3.tar.gz glibc-86005fdbf40d6fc84d84c824d75c656e7c1398e3.tar.xz glibc-86005fdbf40d6fc84d84c824d75c656e7c1398e3.zip | |
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/stdio.h')
| -rw-r--r-- | include/stdio.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/include/stdio.h b/include/stdio.h index 6718af4108..1c09daf13a 100644 --- a/include/stdio.h +++ b/include/stdio.h @@ -2,8 +2,18 @@ # if !defined _ISOMAC && defined _IO_MTSAFE_IO # include <stdio-lock.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 <libio/stdio.h> # ifndef _ISOMAC + # define _LIBC_STDIO_H 1 # include <libio/libio.h> |