diff options
Diffstat (limited to 'gnulib-m4/signbit.m4')
| -rw-r--r-- | gnulib-m4/signbit.m4 | 188 |
1 files changed, 102 insertions, 86 deletions
diff --git a/gnulib-m4/signbit.m4 b/gnulib-m4/signbit.m4 index 9e7884d2..8a4114db 100644 --- a/gnulib-m4/signbit.m4 +++ b/gnulib-m4/signbit.m4 @@ -1,5 +1,5 @@ -# signbit.m4 serial 16 -dnl Copyright (C) 2007-2018 Free Software Foundation, Inc. +# signbit.m4 serial 20 +dnl Copyright (C) 2007-2022 Free Software Foundation, Inc. dnl This file is free software; the Free Software Foundation dnl gives unlimited permission to copy and/or distribute it, dnl with or without modifications, as long as this notice is preserved. @@ -7,7 +7,7 @@ dnl with or without modifications, as long as this notice is preserved. AC_DEFUN([gl_SIGNBIT], [ AC_REQUIRE([gl_MATH_H_DEFAULTS]) - AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles + AC_REQUIRE([AC_CANONICAL_HOST]) AC_CACHE_CHECK([for signbit macro], [gl_cv_func_signbit], [ AC_RUN_IFELSE( @@ -31,22 +31,25 @@ AC_DEFUN([gl_SIGNBIT], [case "$host_os" in # Guess yes on glibc systems. *-gnu* | gnu*) gl_cv_func_signbit="guessing yes" ;; + # Guess yes on musl systems. + *-musl*) gl_cv_func_signbit="guessing yes" ;; # Guess yes on native Windows. mingw*) gl_cv_func_signbit="guessing yes" ;; - # If we don't know, assume the worst. - *) gl_cv_func_signbit="guessing no" ;; + # If we don't know, obey --enable-cross-guesses. + *) gl_cv_func_signbit="$gl_cross_guess_normal" ;; esac ]) ]) - dnl GCC 4.0 and newer provides three built-ins for signbit. + dnl GCC >= 4.0 and clang provide three built-ins for signbit. dnl They can be used without warnings, also in C++, regardless of <math.h>. dnl But they may expand to calls to functions, which may or may not be in dnl libc. - AC_CACHE_CHECK([for signbit compiler built-ins], [gl_cv_func_signbit_gcc], + AC_CACHE_CHECK([for signbit compiler built-ins], + [gl_cv_func_signbit_builtins], [ AC_RUN_IFELSE( [AC_LANG_SOURCE([[ -#if __GNUC__ >= 4 +#if (__GNUC__ >= 4) || (__clang_major__ >= 4) # define signbit(x) \ (sizeof (x) == sizeof (long double) ? __builtin_signbitl (x) : \ sizeof (x) == sizeof (double) ? __builtin_signbit (x) : \ @@ -57,28 +60,30 @@ AC_DEFUN([gl_SIGNBIT], #include <string.h> ]gl_SIGNBIT_TEST_PROGRAM ])], - [gl_cv_func_signbit_gcc=yes], - [gl_cv_func_signbit_gcc=no], + [gl_cv_func_signbit_builtins=yes], + [gl_cv_func_signbit_builtins=no], [case "$host_os" in # Guess yes on glibc systems. - *-gnu* | gnu*) gl_cv_func_signbit_gcc="guessing yes" ;; + *-gnu* | gnu*) gl_cv_func_signbit_builtins="guessing yes" ;; + # Guess yes on musl systems. + *-musl*) gl_cv_func_signbit_builtins="guessing yes" ;; # Guess yes on mingw, no on MSVC. mingw*) if test -n "$GCC"; then - gl_cv_func_signbit_gcc="guessing yes" + gl_cv_func_signbit_builtins="guessing yes" else - gl_cv_func_signbit_gcc="guessing no" + gl_cv_func_signbit_builtins="guessing no" fi ;; - # If we don't know, assume the worst. - *) gl_cv_func_signbit_gcc="guessing no" ;; + # If we don't know, obey --enable-cross-guesses. + *) gl_cv_func_signbit_builtins="$gl_cross_guess_normal" ;; esac ]) ]) dnl Use the compiler built-ins whenever possible, because they are more dnl efficient than the system library functions (if they exist). - case "$gl_cv_func_signbit_gcc" in + case "$gl_cv_func_signbit_builtins" in *yes) - REPLACE_SIGNBIT_USING_GCC=1 + REPLACE_SIGNBIT_USING_BUILTINS=1 ;; *) case "$gl_cv_func_signbit" in @@ -86,79 +91,90 @@ AC_DEFUN([gl_SIGNBIT], *) dnl REPLACE_SIGNBIT=1 makes sure the signbit[fdl] functions get built. REPLACE_SIGNBIT=1 - gl_FLOAT_SIGN_LOCATION - gl_DOUBLE_SIGN_LOCATION - gl_LONG_DOUBLE_SIGN_LOCATION - if test "$gl_cv_cc_float_signbit" = unknown; then - dnl Test whether copysignf() is declared. - AC_CHECK_DECLS([copysignf], , , [[#include <math.h>]]) - if test "$ac_cv_have_decl_copysignf" = yes; then - dnl Test whether copysignf() can be used without libm. - AC_CACHE_CHECK([whether copysignf can be used without linking with libm], - [gl_cv_func_copysignf_no_libm], - [ - AC_LINK_IFELSE( - [AC_LANG_PROGRAM( - [[#include <math.h> - float x, y;]], - [[return copysignf (x, y) < 0;]])], - [gl_cv_func_copysignf_no_libm=yes], - [gl_cv_func_copysignf_no_libm=no]) - ]) - if test $gl_cv_func_copysignf_no_libm = yes; then - AC_DEFINE([HAVE_COPYSIGNF_IN_LIBC], [1], - [Define if the copysignf function is declared in <math.h> and available in libc.]) - fi - fi - fi - if test "$gl_cv_cc_double_signbit" = unknown; then - dnl Test whether copysign() is declared. - AC_CHECK_DECLS([copysign], , , [[#include <math.h>]]) - if test "$ac_cv_have_decl_copysign" = yes; then - dnl Test whether copysign() can be used without libm. - AC_CACHE_CHECK([whether copysign can be used without linking with libm], - [gl_cv_func_copysign_no_libm], - [ - AC_LINK_IFELSE( - [AC_LANG_PROGRAM( - [[#include <math.h> - double x, y;]], - [[return copysign (x, y) < 0;]])], - [gl_cv_func_copysign_no_libm=yes], - [gl_cv_func_copysign_no_libm=no]) - ]) - if test $gl_cv_func_copysign_no_libm = yes; then - AC_DEFINE([HAVE_COPYSIGN_IN_LIBC], [1], - [Define if the copysign function is declared in <math.h> and available in libc.]) - fi - fi - fi - if test "$gl_cv_cc_long_double_signbit" = unknown; then - dnl Test whether copysignl() is declared. - AC_CHECK_DECLS([copysignl], , , [[#include <math.h>]]) - if test "$ac_cv_have_decl_copysignl" = yes; then - dnl Test whether copysignl() can be used without libm. - AC_CACHE_CHECK([whether copysignl can be used without linking with libm], - [gl_cv_func_copysignl_no_libm], - [ - AC_LINK_IFELSE( - [AC_LANG_PROGRAM( - [[#include <math.h> - long double x, y;]], - [[return copysignl (x, y) < 0;]])], - [gl_cv_func_copysignl_no_libm=yes], - [gl_cv_func_copysignl_no_libm=no]) - ]) - if test $gl_cv_func_copysignl_no_libm = yes; then - AC_DEFINE([HAVE_COPYSIGNL_IN_LIBC], [1], - [Define if the copysignl function is declared in <math.h> and available in libc.]) - fi - fi - fi ;; esac ;; esac + dnl On Solaris 10, with CC in C++ mode, signbit is not available although + dnl is with cc in C mode. This cannot be worked around by defining + dnl _XOPEN_SOURCE=600, because the latter does not work in C++ mode on + dnl Solaris 11.0. Therefore use the replacement functions on Solaris. + case "$host_os" in + solaris*) + REPLACE_SIGNBIT=1 + ;; + esac + if test $REPLACE_SIGNBIT = 1; then + gl_FLOAT_SIGN_LOCATION + gl_DOUBLE_SIGN_LOCATION + gl_LONG_DOUBLE_SIGN_LOCATION + if test "$gl_cv_cc_float_signbit" = unknown; then + dnl Test whether copysignf() is declared. + AC_CHECK_DECLS([copysignf], , , [[#include <math.h>]]) + if test "$ac_cv_have_decl_copysignf" = yes; then + dnl Test whether copysignf() can be used without libm. + AC_CACHE_CHECK([whether copysignf can be used without linking with libm], + [gl_cv_func_copysignf_no_libm], + [ + AC_LINK_IFELSE( + [AC_LANG_PROGRAM( + [[#include <math.h> + float x, y;]], + [[return copysignf (x, y) < 0;]])], + [gl_cv_func_copysignf_no_libm=yes], + [gl_cv_func_copysignf_no_libm=no]) + ]) + if test $gl_cv_func_copysignf_no_libm = yes; then + AC_DEFINE([HAVE_COPYSIGNF_IN_LIBC], [1], + [Define if the copysignf function is declared in <math.h> and available in libc.]) + fi + fi + fi + if test "$gl_cv_cc_double_signbit" = unknown; then + dnl Test whether copysign() is declared. + AC_CHECK_DECLS([copysign], , , [[#include <math.h>]]) + if test "$ac_cv_have_decl_copysign" = yes; then + dnl Test whether copysign() can be used without libm. + AC_CACHE_CHECK([whether copysign can be used without linking with libm], + [gl_cv_func_copysign_no_libm], + [ + AC_LINK_IFELSE( + [AC_LANG_PROGRAM( + [[#include <math.h> + double x, y;]], + [[return copysign (x, y) < 0;]])], + [gl_cv_func_copysign_no_libm=yes], + [gl_cv_func_copysign_no_libm=no]) + ]) + if test $gl_cv_func_copysign_no_libm = yes; then + AC_DEFINE([HAVE_COPYSIGN_IN_LIBC], [1], + [Define if the copysign function is declared in <math.h> and available in libc.]) + fi + fi + fi + if test "$gl_cv_cc_long_double_signbit" = unknown; then + dnl Test whether copysignl() is declared. + AC_CHECK_DECLS([copysignl], , , [[#include <math.h>]]) + if test "$ac_cv_have_decl_copysignl" = yes; then + dnl Test whether copysignl() can be used without libm. + AC_CACHE_CHECK([whether copysignl can be used without linking with libm], + [gl_cv_func_copysignl_no_libm], + [ + AC_LINK_IFELSE( + [AC_LANG_PROGRAM( + [[#include <math.h> + long double x, y;]], + [[return copysignl (x, y) < 0;]])], + [gl_cv_func_copysignl_no_libm=yes], + [gl_cv_func_copysignl_no_libm=no]) + ]) + if test $gl_cv_func_copysignl_no_libm = yes; then + AC_DEFINE([HAVE_COPYSIGNL_IN_LIBC], [1], + [Define if the copysignl function is declared in <math.h> and available in libc.]) + fi + fi + fi + fi ]) AC_DEFUN([gl_SIGNBIT_TEST_PROGRAM], [[ |