Mercurial > gnulib
view m4/cbrtl.m4 @ 40109:e2e6dc79463b
Defeat current GCC optimizations in math autoconf tests.
* m4/cbrtl.m4 (gl_FUNC_CBRTL): Mark function pointer as 'volatile'.
* m4/ceil.m4 (gl_FUNC_CEIL): Likewise.
* m4/ceilf.m4 (gl_FUNC_CEILF): Likewise.
* m4/ceill.m4 (gl_FUNC_CEILL): Likewise.
* m4/exp2l.m4 (gl_FUNC_EXP2L): Likewise.
* m4/expm1.m4 (gl_FUNC_EXPM1): Likewise.
* m4/floor.m4 (gl_FUNC_FLOOR): Likewise.
* m4/floorf.m4 (gl_FUNC_FLOORF): Likewise.
* m4/fmod.m4 (gl_FUNC_FMOD): Likewise.
* m4/fmodf.m4 (gl_FUNC_FMODF): Likewise.
* m4/fmodl.m4 (gl_FUNC_FMODL): Likewise.
* m4/hypot.m4 (gl_FUNC_HYPOT): Likewise.
* m4/hypotf.m4 (gl_FUNC_HYPOTF): Likewise.
* m4/hypotl.m4 (gl_FUNC_HYPOTL): Likewise.
* m4/ilogb.m4 (gl_FUNC_ILOGB_WORKS): Likewise.
* m4/ilogbf.m4 (gl_FUNC_ILOGBF_WORKS): Likewise.
* m4/ilogbl.m4 (gl_FUNC_ILOGBL_WORKS): Likewise.
* m4/log.m4 (gl_FUNC_LOG): Likewise.
* m4/logf.m4 (gl_FUNC_LOGF): Likewise.
* m4/log10.m4 (gl_FUNC_LOG10): Likewise.
* m4/log10f.m4 (gl_FUNC_LOG10F): Likewise.
* m4/log1p.m4 (gl_FUNC_LOG1P): Likewise.
* m4/log1pf.m4 (gl_FUNC_LOG1PF): Likewise.
* m4/log1pl.m4 (gl_FUNC_LOG1PL): Likewise.
* m4/log2.m4 (gl_FUNC_LOG2): Likewise.
* m4/log2f.m4 (gl_FUNC_LOG2F): Likewise.
* m4/modf.m4 (gl_FUNC_MODF): Likewise.
* m4/modff.m4 (gl_FUNC_MODFF): Likewise.
* m4/modfl.m4 (gl_FUNC_MODFL): Likewise.
* m4/remainder.m4 (gl_FUNC_REMAINDER): Likewise.
* m4/remainderf.m4 (gl_FUNC_REMAINDERF): Likewise.
* m4/remainderl.m4 (gl_FUNC_REMAINDERL): Likewise.
* m4/round.m4 (gl_FUNC_ROUND): Likewise.
* m4/roundf.m4 (gl_FUNC_ROUNDF): Likewise.
* m4/roundl.m4 (gl_FUNC_ROUNDL): Likewise.
* m4/trunc.m4 (gl_FUNC_TRUNC): Likewise.
* m4/truncf.m4 (gl_FUNC_TRUNCF): Likewise.
* m4/truncl.m4 (gl_FUNC_TRUNCL): Likewise.
author | Bruno Haible <bruno@clisp.org> |
---|---|
date | Sun, 20 Jan 2019 21:19:41 +0100 |
parents | b06060465f09 |
children |
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# cbrtl.m4 serial 8 dnl Copyright (C) 2012-2019 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_CBRTL], [ m4_divert_text([DEFAULTS], [gl_cbrtl_required=plain]) AC_REQUIRE([gl_MATH_H_DEFAULTS]) AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE]) AC_REQUIRE([gl_FUNC_CBRT]) dnl Persuade glibc <math.h> to declare cbrtl(). AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS]) dnl Test whether cbrtl() exists. Assume that cbrtl(), if it exists, is dnl defined in the same library as cbrt(). save_LIBS="$LIBS" LIBS="$LIBS $CBRT_LIBM" AC_CHECK_FUNCS([cbrtl]) LIBS="$save_LIBS" if test $ac_cv_func_cbrtl = yes; then CBRTL_LIBM="$CBRT_LIBM" dnl Also check whether it's declared. dnl IRIX 6.5 has cbrtl() in libm but doesn't declare it in <math.h>. AC_CHECK_DECL([cbrtl], , [HAVE_DECL_CBRTL=0], [[#include <math.h>]]) save_LIBS="$LIBS" LIBS="$LIBS $CBRTL_LIBM" gl_FUNC_CBRTL_WORKS LIBS="$save_LIBS" case "$gl_cv_func_cbrtl_works" in *yes) ;; *) REPLACE_CBRTL=1 ;; esac m4_ifdef([gl_FUNC_CBRTL_IEEE], [ if test $gl_cbrtl_required = ieee && test $REPLACE_CBRTL = 0; then AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles AC_CACHE_CHECK([whether cbrtl works according to ISO C 99 with IEC 60559], [gl_cv_func_cbrtl_ieee], [ save_LIBS="$LIBS" LIBS="$LIBS $CBRTL_LIBM" AC_RUN_IFELSE( [AC_LANG_SOURCE([[ #ifndef __NO_MATH_INLINES # define __NO_MATH_INLINES 1 /* for glibc */ #endif #include <math.h> ]gl_LONG_DOUBLE_MINUS_ZERO_CODE[ ]gl_LONG_DOUBLE_SIGNBIT_CODE[ static long double dummy (long double x) { return 0; } int main (int argc, char *argv[]) { extern #ifdef __cplusplus "C" #endif long double cbrtl (long double); long double (* volatile my_cbrtl) (long double) = argc ? cbrtl : dummy; long double f; /* Test cbrtl(-0.0). This test fails on IRIX 6.5. */ f = my_cbrtl (minus_zerol); if (!(f == 0.0L) || (signbitl (minus_zerol) && !signbitl (f))) return 1; return 0; } ]])], [gl_cv_func_cbrtl_ieee=yes], [gl_cv_func_cbrtl_ieee=no], [case "$host_os" in # Guess yes on glibc systems. *-gnu* | gnu*) gl_cv_func_cbrtl_ieee="guessing yes" ;; # Guess yes on native Windows. mingw*) gl_cv_func_cbrtl_ieee="guessing yes" ;; # If we don't know, assume the worst. *) gl_cv_func_cbrtl_ieee="guessing no" ;; esac ]) LIBS="$save_LIBS" ]) case "$gl_cv_func_cbrtl_ieee" in *yes) ;; *) REPLACE_CBRTL=1 ;; esac fi ]) else HAVE_CBRTL=0 HAVE_DECL_CBRTL=0 fi if test $HAVE_CBRTL = 0 || test $REPLACE_CBRTL = 1; then dnl Find libraries needed to link lib/cbrtl.c. if test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 1; then CBRTL_LIBM="$CBRT_LIBM" else AC_REQUIRE([gl_FUNC_FREXPL]) AC_REQUIRE([gl_FUNC_LDEXPL]) CBRTL_LIBM= dnl Append $FREXPL_LIBM to CBRTL_LIBM, avoiding gratuitous duplicates. case " $CBRTL_LIBM " in *" $FREXPL_LIBM "*) ;; *) CBRTL_LIBM="$CBRTL_LIBM $FREXPL_LIBM" ;; esac dnl Append $LDEXPL_LIBM to CBRTL_LIBM, avoiding gratuitous duplicates. case " $CBRTL_LIBM " in *" $LDEXPL_LIBM "*) ;; *) CBRTL_LIBM="$CBRTL_LIBM $LDEXPL_LIBM" ;; esac fi fi AC_SUBST([CBRTL_LIBM]) ]) dnl Test whether cbrtl() works. dnl On OpenBSD 5.1/SPARC, cbrtl(16.0L) is = 1.2599... AC_DEFUN([gl_FUNC_CBRTL_WORKS], [ AC_REQUIRE([AC_PROG_CC]) AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles AC_CACHE_CHECK([whether cbrtl works], [gl_cv_func_cbrtl_works], [ AC_RUN_IFELSE( [AC_LANG_SOURCE([[ #include <math.h> extern #ifdef __cplusplus "C" #endif long double cbrtl (long double); volatile long double x; long double y; int main () { x = 16.0L; y = cbrtl (x); if (y < 2.0L) return 1; return 0; } ]])], [gl_cv_func_cbrtl_works=yes], [gl_cv_func_cbrtl_works=no], [case "$host_os" in openbsd*) gl_cv_func_cbrtl_works="guessing no";; # Guess yes on native Windows. mingw*) gl_cv_func_cbrtl_works="guessing yes";; *) gl_cv_func_cbrtl_works="guessing yes";; esac ]) ]) ])