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# =========================================================================== |
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# http://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_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_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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# Unsuppored 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 2 |
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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_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_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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[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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]) |
Tom Stellard
11 年前