Mercurial > gnulib
view m4/cbrtf.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 | b06060465f09 |
children |
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# cbrtf.m4 serial 4 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_CBRTF], [ AC_REQUIRE([gl_MATH_H_DEFAULTS]) AC_REQUIRE([gl_FUNC_CBRT]) dnl Persuade glibc <math.h> to declare cbrtf(). AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS]) dnl Test whether cbrtf() exists. Assume that cbrtf(), if it exists, is dnl defined in the same library as cbrt(). save_LIBS="$LIBS" LIBS="$LIBS $CBRT_LIBM" AC_CHECK_FUNCS([cbrtf]) LIBS="$save_LIBS" if test $ac_cv_func_cbrtf = yes; then CBRTF_LIBM="$CBRT_LIBM" dnl Also check whether it's declared. dnl IRIX 6.5 has cbrtf() in libm but doesn't declare it in <math.h>. AC_CHECK_DECL([cbrtf], , [HAVE_DECL_CBRTF=0], [[#include <math.h>]]) save_LIBS="$LIBS" LIBS="$LIBS $CBRTF_LIBM" gl_FUNC_CBRTF_WORKS LIBS="$save_LIBS" case "$gl_cv_func_cbrtf_works" in *yes) ;; *) REPLACE_CBRTF=1 ;; esac else HAVE_CBRTF=0 HAVE_DECL_CBRTF=0 fi if test $HAVE_CBRTF = 0 || test $REPLACE_CBRTF = 1; then dnl Find libraries needed to link lib/cbrtf.c. AC_REQUIRE([gl_FUNC_FABSF]) AC_REQUIRE([gl_FUNC_FREXPF]) AC_REQUIRE([gl_FUNC_LDEXPF]) CBRTF_LIBM= dnl Append $FABSF_LIBM to CBRTF_LIBM, avoiding gratuitous duplicates. case " $CBRTF_LIBM " in *" $FABSF_LIBM "*) ;; *) CBRTF_LIBM="$CBRTF_LIBM $FABSF_LIBM" ;; esac dnl Append $FREXPF_LIBM to CBRTF_LIBM, avoiding gratuitous duplicates. case " $CBRTF_LIBM " in *" $FREXPF_LIBM "*) ;; *) CBRTF_LIBM="$CBRTF_LIBM $FREXPF_LIBM" ;; esac dnl Append $LDEXPF_LIBM to CBRTF_LIBM, avoiding gratuitous duplicates. case " $CBRTF_LIBM " in *" $LDEXPF_LIBM "*) ;; *) CBRTF_LIBM="$CBRTF_LIBM $LDEXPF_LIBM" ;; esac fi AC_SUBST([CBRTF_LIBM]) ]) dnl Test whether cbrtf() works. dnl It returns wrong values on IRIX 6.5. AC_DEFUN([gl_FUNC_CBRTF_WORKS], [ AC_REQUIRE([AC_PROG_CC]) AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles AC_CACHE_CHECK([whether cbrtf works], [gl_cv_func_cbrtf_works], [ AC_RUN_IFELSE( [AC_LANG_SOURCE([[ #include <math.h> volatile float x; volatile float y; int main () { extern #ifdef __cplusplus "C" #endif float cbrtf (float); /* This test fails on IRIX 6.5. */ x = - 0.0f; y = cbrtf (x); if (!(y == 0.0f)) return 1; return 0; } ]])], [gl_cv_func_cbrtf_works=yes], [gl_cv_func_cbrtf_works=no], [case "$host_os" in irix*) gl_cv_func_cbrtf_works="guessing no";; # Guess yes on native Windows. mingw*) gl_cv_func_cbrtf_works="guessing yes";; *) gl_cv_func_cbrtf_works="guessing yes";; esac ]) ]) ])