Feature #1540 » 0032-gnulib-common.m4-Update-to-serial-113.patch
| dependencies/m4/gnulib-common.m4 | ||
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# gnulib-common.m4
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# serial 110
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# serial 113
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dnl Copyright (C) 2007-2025 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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| ... | ... | |
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#endif
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])
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AH_VERBATIM([_Noreturn],
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[/* The _Noreturn keyword of C11. */
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[/* The _Noreturn keyword of C11.
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Do not use [[noreturn]], because with it the syntax
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extern _Noreturn void func (...);
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would not be valid; such a declaration would be valid only with 'extern'
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and '_Noreturn' swapped, or without the 'extern' keyword. However, some
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AIX system header files and several gnulib header files use precisely
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this syntax with 'extern'. So even though C23 deprecates _Noreturn,
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it is currently more portable to prefer it to [[noreturn]].
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Also, do not try to work around LLVM bug 59792 (clang 15 or earlier).
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This rare bug can be worked around by compiling with 'clang -D_Noreturn=',
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though the workaround may generate many false-alarm warnings. */
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#ifndef _Noreturn
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# if (defined __cplusplus \
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&& ((201103 <= __cplusplus && !(__GNUC__ == 4 && __GNUC_MINOR__ == 7)) \
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|| (defined _MSC_VER && 1900 <= _MSC_VER)) \
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&& 0)
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/* [[noreturn]] is not practically usable, because with it the syntax
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extern _Noreturn void func (...);
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would not be valid; such a declaration would only be valid with 'extern'
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and '_Noreturn' swapped, or without the 'extern' keyword. However, some
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AIX system header files and several gnulib header files use precisely
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this syntax with 'extern'. */
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# define _Noreturn [[noreturn]]
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# elif (defined __clang__ && __clang_major__ < 16 \
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&& defined _GL_WORK_AROUND_LLVM_BUG_59792)
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/* Compile with -D_GL_WORK_AROUND_LLVM_BUG_59792 to work around
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that rare LLVM bug, though you may get many false-alarm warnings. */
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# define _Noreturn
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# elif ((!defined __cplusplus || defined __clang__) \
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&& (201112 <= (defined __STDC_VERSION__ ? __STDC_VERSION__ : 0) \
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|| (!defined __STRICT_ANSI__ \
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&& (_GL_GNUC_PREREQ (4, 7) \
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|| (defined __apple_build_version__ \
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? 6000000 <= __apple_build_version__ \
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: 3 < __clang_major__ + (5 <= __clang_minor__))))))
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# if ((!defined __cplusplus || defined __clang__) \
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&& (201112 <= (defined __STDC_VERSION__ ? __STDC_VERSION__ : 0)))
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/* _Noreturn works as-is. */
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# elif _GL_GNUC_PREREQ (2, 8) || defined __clang__ || 0x5110 <= __SUNPRO_C
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/* Prefer __attribute__ ((__noreturn__)) to plain _Noreturn even if the
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latter works, as 'gcc -std=gnu99 -Wpedantic' warns about _Noreturn. */
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# define _Noreturn __attribute__ ((__noreturn__))
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# elif 1200 <= (defined _MSC_VER ? _MSC_VER : 0)
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# define _Noreturn __declspec (noreturn)
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| ... | ... | |
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-1 if n1 < n2
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The naïve code (n1 > n2 ? 1 : n1 < n2 ? -1 : 0) produces a conditional
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jump with nearly all GCC versions up to GCC 10.
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This variant (n1 < n2 ? -1 : n1 > n2) produces a conditional with many
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GCC versions up to GCC 9.
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This variant (n1 < n2 ? -1 : n1 > n2) produces a conditional jump with
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many GCC versions up to GCC 9.
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The better code (n1 > n2) - (n1 < n2) from Hacker's Delight § 2-9
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avoids conditional jumps in all GCC versions >= 3.4. */
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#define _GL_CMP(n1, n2) (((n1) > (n2)) - ((n1) < (n2)))
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