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1cd4fffcde
* .x-sc_prohibit_S_IS_definition: New file. * m4/gnulib-cache.m4: Add `sys_stat'. * libguile/filesys.c: Remove `S_IS*' macro definitions for Ultrix and MinGW.
45 lines
2.2 KiB
C
45 lines
2.2 KiB
C
/* A C macro for emitting link time warnings.
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Copyright (C) 1995, 1997, 2000, 2002-2003, 2007, 2009 Free Software
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Foundation, Inc.
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This program is free software: you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published
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by the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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/* GL_LINK_WARNING("literal string") arranges to emit the literal string as
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a linker warning on most glibc systems.
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We use a linker warning rather than a preprocessor warning, because
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#warning cannot be used inside macros. */
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#ifndef GL_LINK_WARNING
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/* This works on platforms with GNU ld and ELF object format.
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Testing __GLIBC__ is sufficient for asserting that GNU ld is in use.
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Testing __ELF__ guarantees the ELF object format.
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Testing __GNUC__ is necessary for the compound expression syntax. */
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# if defined __GLIBC__ && defined __ELF__ && defined __GNUC__
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# define GL_LINK_WARNING(message) \
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GL_LINK_WARNING1 (__FILE__, __LINE__, message)
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# define GL_LINK_WARNING1(file, line, message) \
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GL_LINK_WARNING2 (file, line, message) /* macroexpand file and line */
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# define GL_LINK_WARNING2(file, line, message) \
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GL_LINK_WARNING3 (file ":" #line ": warning: " message)
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# define GL_LINK_WARNING3(message) \
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({ static const char warning[sizeof (message)] \
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__attribute__ ((__unused__, \
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__section__ (".gnu.warning"), \
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__aligned__ (1))) \
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= message "\n"; \
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(void)0; \
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})
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# else
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# define GL_LINK_WARNING(message) ((void) 0)
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# endif
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#endif
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