135 lines
3.7 KiB
Text
135 lines
3.7 KiB
Text
# float_h.m4
|
|
# serial 15
|
|
dnl Copyright (C) 2007, 2009-2025 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.
|
|
dnl This file is offered as-is, without any warranty.
|
|
|
|
AC_DEFUN([gl_FLOAT_H],
|
|
[
|
|
AC_REQUIRE([AC_PROG_CC])
|
|
AC_REQUIRE([AC_CANONICAL_HOST])
|
|
GL_GENERATE_FLOAT_H=false
|
|
REPLACE_FLOAT_LDBL=0
|
|
case "$host_os" in
|
|
aix* | beos* | openbsd* | mirbsd* | irix*)
|
|
GL_GENERATE_FLOAT_H=true
|
|
;;
|
|
freebsd* | dragonfly*)
|
|
case "$host_cpu" in
|
|
changequote(,)dnl
|
|
i[34567]86 )
|
|
changequote([,])dnl
|
|
GL_GENERATE_FLOAT_H=true
|
|
;;
|
|
x86_64 )
|
|
# On x86_64 systems, the C compiler may still be generating
|
|
# 32-bit code.
|
|
AC_COMPILE_IFELSE(
|
|
[AC_LANG_SOURCE(
|
|
[[#if defined __LP64__ || defined __x86_64__ || defined __amd64__
|
|
int ok;
|
|
#else
|
|
error fail
|
|
#endif
|
|
]])],
|
|
[],
|
|
[GL_GENERATE_FLOAT_H=true])
|
|
;;
|
|
esac
|
|
;;
|
|
linux*)
|
|
case "$host_cpu" in
|
|
powerpc*)
|
|
GL_GENERATE_FLOAT_H=true
|
|
;;
|
|
esac
|
|
;;
|
|
esac
|
|
case "$host_os" in
|
|
aix* | freebsd* | dragonfly* | linux*)
|
|
if $GL_GENERATE_FLOAT_H; then
|
|
REPLACE_FLOAT_LDBL=1
|
|
fi
|
|
;;
|
|
esac
|
|
|
|
dnl Test for completeness w.r.t. ISO C 23.
|
|
REPLACE_FLOAT_SNAN=0
|
|
AC_CACHE_CHECK([whether float.h conforms to ISO C23],
|
|
[gl_cv_header_float_h_isoc23],
|
|
[AC_COMPILE_IFELSE(
|
|
[AC_LANG_PROGRAM(
|
|
[[#include <float.h>
|
|
int x[] = { FLT_DECIMAL_DIG, DBL_DECIMAL_DIG, LDBL_DECIMAL_DIG };
|
|
float maxf = FLT_NORM_MAX;
|
|
double maxd = DBL_NORM_MAX;
|
|
long double maxl = LDBL_NORM_MAX;
|
|
]],
|
|
[[float sf = FLT_SNAN;
|
|
double sd = DBL_SNAN;
|
|
long double sl = LDBL_SNAN;
|
|
return (sf != 0) + (sd != 0) + (sl != 0);
|
|
]])],
|
|
[gl_cv_header_float_h_isoc23=yes],
|
|
[gl_cv_header_float_h_isoc23=no])
|
|
])
|
|
if test $gl_cv_header_float_h_isoc23 != yes; then
|
|
GL_GENERATE_FLOAT_H=true
|
|
REPLACE_FLOAT_SNAN=1
|
|
fi
|
|
|
|
dnl Test against glibc-2.7 Linux/SPARC64 bug.
|
|
REPLACE_ITOLD=0
|
|
AC_CACHE_CHECK([whether conversion from 'int' to 'long double' works],
|
|
[gl_cv_func_itold_works],
|
|
[
|
|
AC_RUN_IFELSE(
|
|
[AC_LANG_SOURCE([[
|
|
int i = -1;
|
|
volatile long double ld;
|
|
int main ()
|
|
{
|
|
ld += i * 1.0L;
|
|
if (ld > 0)
|
|
return 1;
|
|
return 0;
|
|
}]])],
|
|
[gl_cv_func_itold_works=yes],
|
|
[gl_cv_func_itold_works=no],
|
|
[case "$host" in
|
|
sparc*-*-linux*)
|
|
AC_COMPILE_IFELSE(
|
|
[AC_LANG_SOURCE(
|
|
[[#if defined __LP64__ || defined __arch64__
|
|
int ok;
|
|
#else
|
|
error fail
|
|
#endif
|
|
]])],
|
|
[gl_cv_func_itold_works="guessing no"],
|
|
[gl_cv_func_itold_works="guessing yes"])
|
|
;;
|
|
# Guess yes on native Windows.
|
|
mingw* | windows*)
|
|
gl_cv_func_itold_works="guessing yes" ;;
|
|
*)
|
|
gl_cv_func_itold_works="guessing yes" ;;
|
|
esac
|
|
])
|
|
])
|
|
case "$gl_cv_func_itold_works" in
|
|
*no)
|
|
REPLACE_ITOLD=1
|
|
dnl We add the workaround to <float.h> but also to <math.h>,
|
|
dnl to increase the chances that the fix function gets pulled in.
|
|
GL_GENERATE_FLOAT_H=true
|
|
;;
|
|
esac
|
|
|
|
if $GL_GENERATE_FLOAT_H; then
|
|
gl_NEXT_HEADERS([float.h])
|
|
fi
|
|
AC_SUBST([REPLACE_ITOLD])
|
|
])
|