Mercurial > gnulib
view m4/fmodl.m4 @ 39194:a84ae461a2f6
Add cross-compilation results for GNU/Hurd.
* m4/calloc.m4: Add GNU/Hurd guess.
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* m4/hypotl.m4: Likewise.
* m4/link-follow.m4: Likewise.
* m4/link.m4: Likewise.
* m4/linkat.m4: Likewise.
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* m4/logf.m4: Likewise.
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* m4/modff.m4: Likewise.
* m4/modfl.m4: Likewise.
* m4/printf.m4: Likewise.
* m4/pselect.m4: Likewise.
* m4/ptsname.m4: Likewise.
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* m4/remainder.m4: Likewise.
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* m4/remainderl.m4: Likewise.
* m4/rmdir.m4: Likewise.
* m4/round.m4: Likewise.
* m4/roundf.m4: Likewise.
* m4/roundl.m4: Likewise.
* m4/select.m4: Likewise.
* m4/setenv.m4: Likewise.
* m4/signbit.m4: Likewise.
* m4/sleep.m4: Likewise.
* m4/stat.m4: Likewise.
* m4/strerror.m4: Likewise.
* m4/strtok_r.m4: Likewise.
* m4/symlink.m4: Likewise.
* m4/symlinkat.m4: Likewise.
* m4/trunc.m4: Likewise.
* m4/truncf.m4: Likewise.
* m4/truncl.m4: Likewise.
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* m4/ungetc.m4: Likewise.
* m4/usleep.m4: Likewise.
* m4/wcwidth.m4: Likewise.
author | Samuel Thibault <samuel.thibault@gnu.org> |
---|---|
date | Fri, 29 Dec 2017 17:30:07 +0100 |
parents | 5c951c71f25c |
children | 10eb9086bea0 |
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# fmodl.m4 serial 8 dnl Copyright (C) 2011-2017 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. AC_DEFUN([gl_FUNC_FMODL], [ m4_divert_text([DEFAULTS], [gl_fmodl_required=plain]) AC_REQUIRE([gl_MATH_H_DEFAULTS]) AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE]) AC_REQUIRE([gl_FUNC_FMOD]) dnl Persuade glibc <math.h> to declare fmodl(). AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS]) dnl Test whether fmodl() is declared. dnl AIX 5.1 has fmodl() in libc but doesn't declare it in <math.h>, and the dnl function produces NaN results for finite values. AC_CHECK_DECL([fmodl], [ac_cv_have_decl_fmodl=yes], [ac_cv_have_decl_fmodl=no], [[#include <math.h>]]) dnl Test whether fmodl() exists. Assume that fmodl(), if it exists, is dnl defined in the same library as fmod(). save_LIBS="$LIBS" LIBS="$LIBS $FMOD_LIBM" AC_CHECK_FUNCS([fmodl]) LIBS="$save_LIBS" if test $ac_cv_func_fmodl = yes; then FMODL_LIBM="$FMOD_LIBM" if test $ac_cv_have_decl_fmodl = no; then REPLACE_FMODL=1 fi m4_ifdef([gl_FUNC_FMODL_IEEE], [ if test $gl_fmodl_required = ieee && test $REPLACE_FMODL = 0; then AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles AC_CACHE_CHECK([whether fmodl works according to ISO C 99 with IEC 60559], [gl_cv_func_fmodl_ieee], [ save_LIBS="$LIBS" LIBS="$LIBS $FMODL_LIBM" AC_RUN_IFELSE( [AC_LANG_SOURCE([[ #ifndef __NO_MATH_INLINES # define __NO_MATH_INLINES 1 /* for glibc */ #endif #include <math.h> /* Compare two numbers with ==. This is a separate function because IRIX 6.5 "cc -O" miscompiles an 'x == x' test. */ static int numeric_equal (long double x, long double y) { return x == y; } static long double dummy (long double x, long double y) { return 0; } int main (int argc, char *argv[]) { long double (*my_fmodl) (long double, long double) = argc ? fmodl : dummy; long double f; /* Test fmodl(...,0.0L). This test fails on OSF/1 5.1. */ f = my_fmodl (2.0L, 0.0L); if (numeric_equal (f, f)) return 1; return 0; } ]])], [gl_cv_func_fmodl_ieee=yes], [gl_cv_func_fmodl_ieee=no], [case "$host_os" in # Guess yes on glibc systems. *-gnu* | gnu*) gl_cv_func_fmodl_ieee="guessing yes" ;; # Guess yes on native Windows. mingw*) gl_cv_func_fmodl_ieee="guessing yes" ;; # If we don't know, assume the worst. *) gl_cv_func_fmodl_ieee="guessing no" ;; esac ]) LIBS="$save_LIBS" ]) case "$gl_cv_func_fmodl_ieee" in *yes) ;; *) REPLACE_FMODL=1 ;; esac fi ]) else HAVE_FMODL=0 dnl If the function is declared but does not appear to exist, it may be dnl defined as an inline function. In order to avoid a conflict, we have dnl to define rpl_fmodl, not fmodl. AC_CHECK_DECLS([fmodl], [REPLACE_FMODL=1], , [[#include <math.h>]]) fi if test $HAVE_FMODL = 0 || test $REPLACE_FMODL = 1; then dnl Find libraries needed to link lib/fmodl.c. if test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 1; then FMODL_LIBM="$FMOD_LIBM" else AC_REQUIRE([gl_FUNC_FABSL]) AC_REQUIRE([gl_FUNC_FREXPL]) AC_REQUIRE([gl_FUNC_TRUNCL]) AC_REQUIRE([gl_FUNC_LDEXPL]) AC_REQUIRE([gl_FUNC_ISNANL]) FMODL_LIBM= dnl Append $FABSL_LIBM to FMODL_LIBM, avoiding gratuitous duplicates. case " $FMODL_LIBM " in *" $FABSL_LIBM "*) ;; *) FMODL_LIBM="$FMODL_LIBM $FABSL_LIBM" ;; esac dnl Append $FREXPL_LIBM to FMODL_LIBM, avoiding gratuitous duplicates. case " $FMODL_LIBM " in *" $FREXPL_LIBM "*) ;; *) FMODL_LIBM="$FMODL_LIBM $FREXPL_LIBM" ;; esac dnl Append $TRUNCL_LIBM to FMODL_LIBM, avoiding gratuitous duplicates. case " $FMODL_LIBM " in *" $TRUNCL_LIBM "*) ;; *) FMODL_LIBM="$FMODL_LIBM $TRUNCL_LIBM" ;; esac dnl Append $LDEXPL_LIBM to FMODL_LIBM, avoiding gratuitous duplicates. case " $FMODL_LIBM " in *" $LDEXPL_LIBM "*) ;; *) FMODL_LIBM="$FMODL_LIBM $LDEXPL_LIBM" ;; esac dnl Append $ISNANL_LIBM to FMODL_LIBM, avoiding gratuitous duplicates. case " $FMODL_LIBM " in *" $ISNANL_LIBM "*) ;; *) FMODL_LIBM="$FMODL_LIBM $ISNANL_LIBM" ;; esac fi fi AC_SUBST([FMODL_LIBM]) ])