mirror of
https://github.com/kdave/btrfs-progs
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185 lines
6.2 KiB
Plaintext
185 lines
6.2 KiB
Plaintext
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# ===========================================================================
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# https://www.gnu.org/software/autoconf-archive/ax_gcc_builtin.html
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# ===========================================================================
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#
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# SYNOPSIS
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#
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# AX_GCC_BUILTIN(BUILTIN)
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#
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# DESCRIPTION
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#
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# This macro checks if the compiler supports one of GCC's built-in
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# functions; many other compilers also provide those same built-ins.
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#
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# The BUILTIN parameter is the name of the built-in function.
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#
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# If BUILTIN is supported define HAVE_<BUILTIN>. Keep in mind that since
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# builtins usually start with two underscores they will be copied over
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# into the HAVE_<BUILTIN> definition (e.g. HAVE___BUILTIN_EXPECT for
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# __builtin_expect()).
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#
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# The macro caches its result in the ax_cv_have_<BUILTIN> variable (e.g.
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# ax_cv_have___builtin_expect).
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#
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# The macro currently supports the following built-in functions:
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#
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# __builtin_assume_aligned
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# __builtin_bswap16
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# __builtin_bswap32
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# __builtin_bswap64
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# __builtin_choose_expr
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# __builtin___clear_cache
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# __builtin_clrsb
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# __builtin_clrsbl
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# __builtin_clrsbll
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# __builtin_clz
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# __builtin_clzl
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# __builtin_clzll
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# __builtin_complex
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# __builtin_constant_p
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# __builtin_cpu_init
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# __builtin_cpu_is
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# __builtin_cpu_supports
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# __builtin_ctz
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# __builtin_ctzl
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# __builtin_ctzll
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# __builtin_expect
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# __builtin_ffs
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# __builtin_ffsl
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# __builtin_ffsll
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# __builtin_fpclassify
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# __builtin_huge_val
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# __builtin_huge_valf
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# __builtin_huge_vall
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# __builtin_inf
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# __builtin_infd128
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# __builtin_infd32
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# __builtin_infd64
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# __builtin_inff
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# __builtin_infl
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# __builtin_isinf_sign
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# __builtin_nan
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# __builtin_nand128
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# __builtin_nand32
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# __builtin_nand64
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# __builtin_nanf
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# __builtin_nanl
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# __builtin_nans
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# __builtin_nansf
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# __builtin_nansl
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# __builtin_object_size
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# __builtin_parity
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# __builtin_parityl
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# __builtin_parityll
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# __builtin_popcount
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# __builtin_popcountl
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# __builtin_popcountll
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# __builtin_powi
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# __builtin_powif
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# __builtin_powil
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# __builtin_prefetch
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# __builtin_trap
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# __builtin_types_compatible_p
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# __builtin_unreachable
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#
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# New:
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# __builtin_add_overflow
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# __builtin_sub_overflow
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# __builtin_mul_overflow
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#
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# Unsupported built-ins will be tested with an empty parameter set and the
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# result of the check might be wrong or meaningless so use with care.
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#
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# LICENSE
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#
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# Copyright (c) 2013 Gabriele Svelto <gabriele.svelto@gmail.com>
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#
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# Copying and distribution of this file, with or without modification, are
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# permitted in any medium without royalty provided the copyright notice
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# and this notice are preserved. This file is offered as-is, without any
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# warranty.
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#serial 7
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AC_DEFUN([AX_GCC_BUILTIN], [
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AS_VAR_PUSHDEF([ac_var], [ax_cv_have_$1])
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AC_CACHE_CHECK([for $1], [ac_var], [
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AC_LINK_IFELSE([AC_LANG_PROGRAM([], [
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m4_case([$1],
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[__builtin_assume_aligned], [$1("", 0)],
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[__builtin_bswap16], [$1(0)],
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[__builtin_bswap32], [$1(0)],
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[__builtin_bswap64], [$1(0)],
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[__builtin_choose_expr], [$1(0, 0, 0)],
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[__builtin___clear_cache], [$1("", "")],
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[__builtin_clrsb], [$1(0)],
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[__builtin_clrsbl], [$1(0)],
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[__builtin_clrsbll], [$1(0)],
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[__builtin_clz], [$1(0)],
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[__builtin_clzl], [$1(0)],
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[__builtin_clzll], [$1(0)],
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[__builtin_complex], [$1(0.0, 0.0)],
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[__builtin_constant_p], [$1(0)],
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[__builtin_cpu_init], [$1()],
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[__builtin_cpu_is], [$1("intel")],
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[__builtin_cpu_supports], [$1("sse")],
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[__builtin_ctz], [$1(0)],
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[__builtin_ctzl], [$1(0)],
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[__builtin_ctzll], [$1(0)],
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[__builtin_expect], [$1(0, 0)],
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[__builtin_ffs], [$1(0)],
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[__builtin_ffsl], [$1(0)],
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[__builtin_ffsll], [$1(0)],
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[__builtin_fpclassify], [$1(0, 1, 2, 3, 4, 0.0)],
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[__builtin_huge_val], [$1()],
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[__builtin_huge_valf], [$1()],
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[__builtin_huge_vall], [$1()],
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[__builtin_inf], [$1()],
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[__builtin_infd128], [$1()],
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[__builtin_infd32], [$1()],
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[__builtin_infd64], [$1()],
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[__builtin_inff], [$1()],
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[__builtin_infl], [$1()],
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[__builtin_isinf_sign], [$1(0.0)],
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[__builtin_nan], [$1("")],
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[__builtin_nand128], [$1("")],
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[__builtin_nand32], [$1("")],
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[__builtin_nand64], [$1("")],
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[__builtin_nanf], [$1("")],
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[__builtin_nanl], [$1("")],
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[__builtin_nans], [$1("")],
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[__builtin_nansf], [$1("")],
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[__builtin_nansl], [$1("")],
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[__builtin_object_size], [$1("", 0)],
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[__builtin_parity], [$1(0)],
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[__builtin_parityl], [$1(0)],
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[__builtin_parityll], [$1(0)],
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[__builtin_popcount], [$1(0)],
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[__builtin_popcountl], [$1(0)],
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[__builtin_popcountll], [$1(0)],
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[__builtin_powi], [$1(0, 0)],
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[__builtin_powif], [$1(0, 0)],
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[__builtin_powil], [$1(0, 0)],
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[__builtin_prefetch], [$1("")],
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[__builtin_trap], [$1()],
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[__builtin_types_compatible_p], [$1(int, int)],
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[__builtin_unreachable], [$1()],
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[__builtin_add_overflow], [$1(0, 1, (int *)0)],
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[__builtin_sub_overflow], [$1(0, 1, (int *)0)],
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[__builtin_mul_overflow], [$1(0, 1, (int *)0)],
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[m4_warn([syntax], [Unsupported built-in $1, the test may fail])
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$1()]
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)
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])],
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[AS_VAR_SET([ac_var], [yes])],
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[AS_VAR_SET([ac_var], [no])])
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])
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AS_IF([test yes = AS_VAR_GET([ac_var])],
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[AC_DEFINE_UNQUOTED(AS_TR_CPP(HAVE_$1), 1,
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[Define to 1 if the system has the `$1' built-in function])], [])
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AS_VAR_POPDEF([ac_var])
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])
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