Mercurial > gnulib
view m4/expm1f.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 |
line wrap: on
line source
# expm1f.m4 serial 3 dnl Copyright (C) 2011-2019 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_EXPM1F], [ AC_REQUIRE([gl_MATH_H_DEFAULTS]) AC_REQUIRE([gl_FUNC_EXPM1]) dnl Persuade glibc <math.h> to declare expm1f(). AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS]) dnl Test whether expm1f() exists. Assume that expm1f(), if it exists, is dnl defined in the same library as expm1(). save_LIBS="$LIBS" LIBS="$LIBS $EXPM1_LIBM" AC_CHECK_FUNCS([expm1f]) LIBS="$save_LIBS" if test $ac_cv_func_expm1f = yes; then EXPM1F_LIBM="$EXPM1_LIBM" save_LIBS="$LIBS" LIBS="$LIBS $EXPM1F_LIBM" gl_FUNC_EXPM1F_WORKS LIBS="$save_LIBS" case "$gl_cv_func_expm1f_works" in *yes) ;; *) REPLACE_EXPM1F=1 ;; esac else HAVE_EXPM1F=0 fi if test $HAVE_EXPM1F = 0 || test $REPLACE_EXPM1F = 1; then dnl Find libraries needed to link lib/expm1f.c. EXPM1F_LIBM="$EXPM1_LIBM" fi AC_SUBST([EXPM1F_LIBM]) ]) dnl Test whether expm1f() works. dnl On IRIX 6.5, for arguments <= -17.32868, it returns -5.6295e14. AC_DEFUN([gl_FUNC_EXPM1F_WORKS], [ AC_REQUIRE([AC_PROG_CC]) AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles AC_CACHE_CHECK([whether expm1f works], [gl_cv_func_expm1f_works], [ AC_RUN_IFELSE( [AC_LANG_SOURCE([[ #include <math.h> volatile float x; float y; int main () { x = -100.0f; y = expm1f (x); if (y < -1.0f) return 1; return 0; } ]])], [gl_cv_func_expm1f_works=yes], [gl_cv_func_expm1f_works=no], [case "$host_os" in irix*) gl_cv_func_expm1f_works="guessing no" ;; # Guess yes on native Windows. mingw*) gl_cv_func_expm1f_works="guessing yes" ;; *) gl_cv_func_expm1f_works="guessing yes" ;; esac ]) ]) ])