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From: | Paul E Murphy |
Subject: | Re: [PATCH] Merge glibc ieee128 ldbl redirect support into cdefs.h |
Date: | Mon, 4 Jan 2021 16:52:51 -0600 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.6.0 |
On 1/4/21 12:27 PM, Bruno Haible wrote:
Paul E Murphy wrote:We ran into the following: In file included from /home/tuliom/opt/at-next-15.0-0-alpha/include/stdio.h:871, from ./stdio.h:43, from /home/tuliom/tmp/at-build-tray/at15.0-0-alpha.redhat-8_ppc64le_ppc64le/sources /gdb/gnulib/import/tempname.h:23, from /home/tuliom/tmp/at-build-tray/at15.0-0-alpha.redhat-8_ppc64le_ppc64le/sources /gdb/gnulib/import/tempname.c:20: /home/tuliom/opt/at-next-15.0-0-alpha/include/bits/stdio-ldbl.h: In function ‘__LDBL_REDIR1_DECL’: /home/tuliom/opt/at-next-15.0-0-alpha/include/bits/stdio-ldbl.h:36:1: error: expected declaration specifiers before ‘__LDBL_REDIR1_DECL’ 36 | __LDBL_REDIR1_DECL (scanf, __isoc99_scanfieee128) | ^~~~~~~~~~~~~~~~~~ The missing macro is provided by glibc's cdefs.h. Thus, the wrong cdefs.h was picked up.The one from glibc is meant to be included when someone writes #include <sys/cdefs.h> The one from Gnulib is meant to be included when someone writes #include <cdefs.h> via #include <libc-config.h> If the wrong one was picked up, it sounds you have too many -I options in your compilation commands.
Oops, the trace I posted wasn't complete. Here it is in it's full form. The gnulib headers are included as expected.
Note, this is building with -mabi=ieeelongdouble option, thus this requires both a sufficiently new gcc (8+) and glibc (2.23+).
In file included from /home/murp/opt/at-next-15.0-0-alpha/include/stdio.h:871,
from ./stdio.h:43,from /home/murp/tmp/at-build-tray/at15.0-0-alpha.ubuntu-18_ppc64le_ppc64le/sources/gdb/gnulib/import/tempname.h:23, from /home/murp/tmp/at-build-tray/at15.0-0-alpha.ubuntu-18_ppc64le_ppc64le/sources/gdb/gnulib/import/tempname.c:20: /home/murp/opt/at-next-15.0-0-alpha/include/bits/stdio-ldbl.h: In function ‘__LDBL_REDIR1_DECL’: /home/murp/opt/at-next-15.0-0-alpha/include/bits/stdio-ldbl.h:36:1: error: expected declaration specifiers before ‘__LDBL_REDIR1_DECL’
36 | __LDBL_REDIR1_DECL (scanf, __isoc99_scanfieee128) | ^~~~~~~~~~~~~~~~~~ In file included from ./stdio.h:53,from /home/murp/tmp/at-build-tray/at15.0-0-alpha.ubuntu-18_ppc64le_ppc64le/sources/gdb/gnulib/import/tempname.h:23, from /home/murp/tmp/at-build-tray/at15.0-0-alpha.ubuntu-18_ppc64le_ppc64le/sources/gdb/gnulib/import/tempname.c:20:
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