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From: Paul E. Murphy <murphyp@sourceware.org> To: glibc-cvs@sourceware.org Subject: [glibc] ldbl-128ibm-compat: workaround GCC 9 C++ PR90731 Date: Thu, 30 Apr 2020 16:20:52 +0000 (GMT) [thread overview] Message-ID: <20200430162052.D28373894E6C@sourceware.org> (raw) [-- Warning: decoded text below may be mangled, UTF-8 assumed --] [-- Attachment #1: Type: text/plain; charset="us-ascii", Size: 4605 bytes --] https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=86005fdbf40d6fc84d84c824d75c656e7c1398e3 commit 86005fdbf40d6fc84d84c824d75c656e7c1398e3 Author: Paul E. Murphy <murphyp@linux.vnet.ibm.com> Date: Fri Mar 6 09:41:03 2020 -0600 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> Diff: --- include/monetary.h | 8 ++++++++ include/printf.h | 8 ++++++++ include/stdio.h | 10 ++++++++++ include/stdlib.h | 9 +++++++++ include/wchar.h | 9 +++++++++ 5 files changed, 44 insertions(+) diff --git a/include/monetary.h b/include/monetary.h index 240925e87d..bddc660ce2 100644 --- a/include/monetary.h +++ b/include/monetary.h @@ -1,3 +1,11 @@ +/* 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/monetary.h> #ifndef _ISOMAC #include <stdarg.h> diff --git a/include/printf.h b/include/printf.h index d051514119..bdcfd29f63 100644 --- a/include/printf.h +++ b/include/printf.h @@ -1,5 +1,13 @@ #ifndef _PRINTF_H +/* 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 <stdio-common/printf.h> # ifndef _ISOMAC 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> 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. */ diff --git a/include/wchar.h b/include/wchar.h index 617906eb14..bb49d844be 100644 --- a/include/wchar.h +++ b/include/wchar.h @@ -1,4 +1,13 @@ #ifndef _WCHAR_H + +/* 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 <wcsmbs/wchar.h> # ifndef _ISOMAC
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