Mercurial > gnulib
view m4/cbrtl.m4 @ 40177:dcd889592b62
dtoastr,ftoastr,ldtoastr: port to c-strtod changes
Decouple these modules from c-strtod. Nowadays it’s reasonable to
assume the C99 signatures for strtod and strtold. Programs that
require stricter adherence to C99 should also use the strtod and
strtold modules as needed, and we no longer need the
HAVE_C99_STRTOLD macro.
* NEWS: Mention this.
* lib/ftoastr.c (STRTOF) [LENGTH == 3]: Assume strtold.
* m4/c-strtod.m4 (gl_C_STRTOLD): Do not define HAVE_C99_STRTOLD.
* modules/dtoastr, modules/ftoastr, modules/ldtoastr:
(Files): Remove m4/c-strtod.m4.
(configure.ac): Do not require gl_C99_STRTOLD, which no longer
exists.
author | Paul Eggert <eggert@cs.ucla.edu> |
---|---|
date | Sat, 02 Feb 2019 13:01:55 -0800 |
parents | e2e6dc79463b |
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 ]) ]) ])