Mercurial > gnulib
view m4/remainderf.m4 @ 39194:a84ae461a2f6
Add cross-compilation results for GNU/Hurd.
* m4/calloc.m4: Add GNU/Hurd guess.
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* m4/ptsname.m4: Likewise.
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* m4/remainder.m4: Likewise.
* m4/remainderf.m4: Likewise.
* m4/remainderl.m4: Likewise.
* m4/rmdir.m4: Likewise.
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* m4/roundl.m4: Likewise.
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author | Samuel Thibault <samuel.thibault@gnu.org> |
---|---|
date | Fri, 29 Dec 2017 17:30:07 +0100 |
parents | 5c951c71f25c |
children | 10eb9086bea0 |
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# remainderf.m4 serial 10 dnl Copyright (C) 2012-2017 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_REMAINDERF], [ m4_divert_text([DEFAULTS], [gl_remainderf_required=plain]) AC_REQUIRE([gl_MATH_H_DEFAULTS]) AC_REQUIRE([gl_FUNC_REMAINDER]) dnl Persuade glibc <math.h> to declare remainderf(). AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS]) dnl Test whether remainderf() exists. Assume that remainderf(), if it exists, is dnl defined in the same library as remainder(). save_LIBS="$LIBS" LIBS="$LIBS $REMAINDER_LIBM" AC_CACHE_CHECK([for remainderf], [gl_cv_func_remainderf], [ AC_LINK_IFELSE( [AC_LANG_PROGRAM( [[#ifndef __NO_MATH_INLINES # define __NO_MATH_INLINES 1 /* for glibc */ #endif #include <math.h> extern #ifdef __cplusplus "C" #endif float remainderf (float, float); float (*funcptr) (float, float) = remainderf; float x; float y;]], [[return funcptr (x, y) > 1 || remainderf (x, y) > 1;]])], [gl_cv_func_remainderf=yes], [gl_cv_func_remainderf=no]) ]) LIBS="$save_LIBS" if test $gl_cv_func_remainderf = yes; then REMAINDERF_LIBM="$REMAINDER_LIBM" save_LIBS="$LIBS" LIBS="$LIBS $REMAINDERF_LIBM" gl_FUNC_REMAINDERF_WORKS LIBS="$save_LIBS" case "$gl_cv_func_remainderf_works" in *yes) ;; *) REPLACE_REMAINDERF=1 ;; esac m4_ifdef([gl_FUNC_REMAINDERF_IEEE], [ if test $gl_remainderf_required = ieee && test $REPLACE_REMAINDERF = 0; then AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles AC_CACHE_CHECK([whether remainderf works according to ISO C 99 with IEC 60559], [gl_cv_func_remainderf_ieee], [ save_LIBS="$LIBS" LIBS="$LIBS $REMAINDERF_LIBM" AC_RUN_IFELSE( [AC_LANG_SOURCE([[ #ifndef __NO_MATH_INLINES # define __NO_MATH_INLINES 1 /* for glibc */ #endif #include <math.h> extern #ifdef __cplusplus "C" #endif float remainderf (float, float); /* Compare two numbers with ==. This is a separate function because IRIX 6.5 "cc -O" miscompiles an 'x == x' test. */ static int numeric_equal (float x, float y) { return x == y; } static float dummy (float x, float y) { return 0; } int main (int argc, char *argv[]) { float (*my_remainderf) (float, float) = argc ? remainderf : dummy; float f; /* Test remainderf(...,0.0f). This test fails on OSF/1 5.1. */ f = my_remainderf (2.0f, 0.0f); if (numeric_equal (f, f)) return 1; return 0; } ]])], [gl_cv_func_remainderf_ieee=yes], [gl_cv_func_remainderf_ieee=no], [case "$host_os" in # Guess yes on glibc systems. *-gnu* | gnu*) gl_cv_func_remainderf_ieee="guessing yes" ;; # Guess yes on native Windows. mingw*) gl_cv_func_remainderf_ieee="guessing yes" ;; # If we don't know, assume the worst. *) gl_cv_func_remainderf_ieee="guessing no" ;; esac ]) LIBS="$save_LIBS" ]) case "$gl_cv_func_remainderf_ieee" in *yes) ;; *) REPLACE_REMAINDERF=1 ;; esac fi ]) else HAVE_REMAINDERF=0 fi if test $HAVE_REMAINDERF = 0 || test $REPLACE_REMAINDERF = 1; then dnl Find libraries needed to link lib/remainderf.c. if test $gl_cv_func_remainder_no_libm = yes \ || test $gl_cv_func_remainder_in_libm = yes; then AC_DEFINE([HAVE_REMAINDER], [1], [Define to 1 if the remainder() function is available in libc or libm.]) REMAINDERF_LIBM="$REMAINDER_LIBM" else AC_REQUIRE([gl_FUNC_FABSF]) AC_REQUIRE([gl_FUNC_FMODF]) AC_REQUIRE([gl_FUNC_ISNANF]) REMAINDERF_LIBM= dnl Append $FABSF_LIBM to REMAINDERF_LIBM, avoiding gratuitous duplicates. case " $REMAINDERF_LIBM " in *" $FABSF_LIBM "*) ;; *) REMAINDERF_LIBM="$REMAINDERF_LIBM $FABSF_LIBM" ;; esac dnl Append $FMODF_LIBM to REMAINDERF_LIBM, avoiding gratuitous duplicates. case " $REMAINDERF_LIBM " in *" $FMODF_LIBM "*) ;; *) REMAINDERF_LIBM="$REMAINDERF_LIBM $FMODF_LIBM" ;; esac dnl Append $ISNANF_LIBM to REMAINDERF_LIBM, avoiding gratuitous duplicates. case " $REMAINDERF_LIBM " in *" $ISNANF_LIBM "*) ;; *) REMAINDERF_LIBM="$REMAINDERF_LIBM $ISNANF_LIBM" ;; esac fi fi AC_SUBST([REMAINDERF_LIBM]) ]) dnl Test whether remainderf() works. dnl It runs into an endless loop on IRIX 6.5. AC_DEFUN([gl_FUNC_REMAINDERF_WORKS], [ AC_REQUIRE([AC_PROG_CC]) AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles AC_CHECK_DECLS_ONCE([alarm]) AC_CACHE_CHECK([whether remainderf works], [gl_cv_func_remainderf_works], [ AC_RUN_IFELSE( [AC_LANG_SOURCE([[ #include <math.h> #if HAVE_DECL_ALARM # include <signal.h> # include <unistd.h> #endif extern #ifdef __cplusplus "C" #endif float remainderf (float, float); volatile float x; volatile float y; float z; int main () { #if HAVE_DECL_ALARM signal (SIGALRM, SIG_DFL); alarm (5); #endif /* This test fails on IRIX 6.5. */ x = 9.316161e+37f; y = 0.5475547314f; z = remainderf (x, y); return 0; } ]])], [gl_cv_func_remainderf_works=yes], [gl_cv_func_remainderf_works=no], [case "$host_os" in irix*) gl_cv_func_remainderf_works="guessing no" ;; # Guess yes on native Windows. mingw*) gl_cv_func_remainderf_works="guessing yes" ;; *) gl_cv_func_remainderf_works="guessing yes" ;; esac ]) ]) ])