Mercurial > gnulib
view m4/cbrtl.m4 @ 36236:28e5b28a0666
cbrtl-ieee: Work around test failure on IRIX 6.5.
* m4/cbrtl-ieee.m4: New file.
* m4/cbrtl.m4 (gl_FUNC_CBRTL): If gl_FUNC_CBRTL_IEEE is present,
test whether cbrtl works with a minus zero argument. Replace it if not.
* lib/math.in.h (cbrtl): Override if REPLACE_CBRTL is 1.
* m4/math_h.m4 (gl_MATH_H_DEFAULTS): Initialize REPLACE_CBRTL.
* modules/math (Makefile.am): Substitute REPLACE_CBRTL.
* modules/cbrtl (configure.ac): Consider REPLACE_CBRTL.
(Depends-on): Update conditions.
* modules/cbrtl-ieee (Files): Add m4/cbrtl-ieee.m4, m4/minus-zero.m4,
m4/signbit.m4.
(configure.ac): Invoke gl_FUNC_CBRTL_IEEE.
* lib/cbrtl.c (cbrtl) [IRIX]: Avoid an unnecessary addition.
* doc/posix-functions/cbrtl.texi: Mention the cbrtl-ieee module.
author | Bruno Haible <bruno@clisp.org> |
---|---|
date | Thu, 01 Mar 2012 04:54:18 +0100 |
parents | b169ebd5b090 |
children | fdbe3125f81a |
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# cbrtl.m4 serial 2 dnl Copyright (C) 2012 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 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>]]) m4_ifdef([gl_FUNC_CBRTL_IEEE], [ if test $gl_cbrtl_required = ieee && test $REPLACE_CBRTL = 0; then AC_CACHE_CHECK([whether cbrtl works according to ISO C 99 with IEC 60559], [gl_cv_func_cbrtl_ieee], [ save_LIBS="$LIBS" LIBS="$LIBS $CBRTL_LIBM" AC_RUN_IFELSE( [AC_LANG_SOURCE([[ #ifndef __NO_MATH_INLINES # define __NO_MATH_INLINES 1 /* for glibc */ #endif #include <math.h> ]gl_LONG_DOUBLE_MINUS_ZERO_CODE[ ]gl_LONG_DOUBLE_SIGNBIT_CODE[ static long double dummy (long double x) { return 0; } int main (int argc, char *argv[]) { extern #ifdef __cplusplus "C" #endif long double cbrtl (long double); long double (*my_cbrtl) (long double) = argc ? cbrtl : dummy; long double f; /* Test cbrtl(-0.0). This test fails on IRIX 6.5. */ f = my_cbrtl (minus_zerol); if (!(f == 0.0L) || (signbitl (minus_zerol) && !signbitl (f))) return 1; return 0; } ]])], [gl_cv_func_cbrtl_ieee=yes], [gl_cv_func_cbrtl_ieee=no], [gl_cv_func_cbrtl_ieee="guessing no"]) LIBS="$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]) ])