80d50c5665
* tools/snippet/_Noreturn.h, tools/snippet/c++defs.h, tools/snippet/arg-nonnull.h, tools/snippet/warn-on-use.h: Rename to... * lib/_Noreturn.h, lib/c++defs.h, lib/arg-nonnull.h, lib/warn-on-use.h: ... these. * lib/filename.h, lib/getopt-cdefs.in.h, lib/getopt-core.h, lib/getopt-ext.h, lib/getopt-pfx-core.h, lib/getopt-pfx-ext.h, lib/localtime-buffer.c, lib/localtime-buffer.h, lib/malloca.c, lib/malloca.h, lib/malloca.valgrind, lib/stat-w32.c, lib/stat-w32.h, m4/eealloc.m4, m4/localtime-buffer.m4, m4/malloca.m4: New files. * lib/argp-help.c, lib/argp-parse.c, lib/error.c, lib/float.in.h, lib/getopt1.c, lib/getopt.c, lib/getopt.in.h, lib/getopt_int.h, lib/gettext.h, lib/gettimeofday.c, lib/intprops.h, lib/isatty.c, lib/limits.in.h, lib/localcharset.c, lib/Makefile.am, lib/mbrtowc.c, lib/mbsinit.c, lib/msvc-nothrow.c, lib/quotearg.c, lib/stat.c, lib/stdalign.in.h, lib/stdint.in.h, lib/string.in.h, lib/sys_stat.in.h, lib/sys_types.in.h, lib/tempname.c, lib/time.in.h, lib/unistd.in.h, lib/vasnprintf.c, lib/wchar.in.h, lib/wctype.in.h, lib/xalloc.h, lib/xalloc-oversized.h, m4/fcntl-o.m4, m4/float_h.m4, m4/getopt.m4, m4/gettimeofday.m4, m4/gnulib-common.m4, m4/gnulib-comp.m4, m4/include_next.m4, m4/largefile.m4, m4/lstat.m4, m4/mbrtowc.m4, m4/memchr.m4, m4/mkstemp.m4, m4/printf.m4, m4/sleep.m4, m4/stat.m4, m4/stdalign.m4, m4/stdint.m4, m4/strerror.m4, m4/string_h.m4, m4/sys_stat_h.m4, m4/sys_time_h.m4, m4/sys_types_h.m4, m4/time_h.m4, m4/unistd_h.m4, m4/wchar_h.m4, m4/wctype_h.m4, m4/wint_t.m4: Update.
57 lines
2.3 KiB
Text
57 lines
2.3 KiB
Text
# Check for stdalign.h that conforms to C11.
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dnl Copyright 2011-2017 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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# Prepare for substituting <stdalign.h> if it is not supported.
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AC_DEFUN([gl_STDALIGN_H],
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[
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AC_CACHE_CHECK([for working stdalign.h],
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[gl_cv_header_working_stdalign_h],
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[AC_COMPILE_IFELSE(
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[AC_LANG_PROGRAM(
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[[#include <stdalign.h>
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#include <stddef.h>
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/* Test that alignof yields a result consistent with offsetof.
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This catches GCC bug 52023
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<http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52023>. */
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#ifdef __cplusplus
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template <class t> struct alignof_helper { char a; t b; };
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# define ao(type) offsetof (alignof_helper<type>, b)
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#else
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# define ao(type) offsetof (struct { char a; type b; }, b)
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#endif
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char test_double[ao (double) % _Alignof (double) == 0 ? 1 : -1];
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char test_long[ao (long int) % _Alignof (long int) == 0 ? 1 : -1];
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char test_alignof[alignof (double) == _Alignof (double) ? 1 : -1];
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/* Test _Alignas only on platforms where gnulib can help. */
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#if \
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((defined __cplusplus && 201103 <= __cplusplus) \
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|| (defined __APPLE__ && defined __MACH__ \
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? 4 < __GNUC__ + (1 <= __GNUC_MINOR__) \
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: __GNUC__) \
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|| (__ia64 && (61200 <= __HP_cc || 61200 <= __HP_aCC)) \
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|| __ICC || 0x590 <= __SUNPRO_C || 0x0600 <= __xlC__ \
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|| 1300 <= _MSC_VER)
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struct alignas_test { char c; char alignas (8) alignas_8; };
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char test_alignas[offsetof (struct alignas_test, alignas_8) == 8
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? 1 : -1];
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#endif
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]])],
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[gl_cv_header_working_stdalign_h=yes],
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[gl_cv_header_working_stdalign_h=no])])
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if test $gl_cv_header_working_stdalign_h = yes; then
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STDALIGN_H=''
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else
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STDALIGN_H='stdalign.h'
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fi
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AC_SUBST([STDALIGN_H])
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AM_CONDITIONAL([GL_GENERATE_STDALIGN_H], [test -n "$STDALIGN_H"])
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])
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