Mercurial > gnulib
view m4/tanf.m4 @ 39246:ef22bb0a9591
lock: Fix test-once1 crash on FreeBSD11.
* lib/glthread/lock.h: On FreeBSD, test the weak value of the symbol
'pthread_create', not 'pthread_cancel'.
author | Bruno Haible <bruno@clisp.org> |
---|---|
date | Sat, 17 Feb 2018 10:23:35 +0100 |
parents | 24e347e0e326 |
children | b06060465f09 |
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# tanf.m4 serial 3 dnl Copyright (C) 2011-2018 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_TANF], [ AC_REQUIRE([gl_MATH_H_DEFAULTS]) AC_REQUIRE([gl_FUNC_TAN]) dnl Persuade glibc <math.h> to declare tanf(). AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS]) dnl Test whether tanf() exists. Assume that tanf(), if it exists, is dnl defined in the same library as tan(). save_LIBS="$LIBS" LIBS="$LIBS $TAN_LIBM" AC_CHECK_FUNCS([tanf]) LIBS="$save_LIBS" if test $ac_cv_func_tanf = yes; then TANF_LIBM="$TAN_LIBM" else HAVE_TANF=0 dnl If the function is declared but does not appear to exist, it may be dnl defined as an inline function. In order to avoid a conflict, we have dnl to define rpl_tanf, not tanf. AC_CHECK_DECLS([tanf], [REPLACE_TANF=1], , [[#include <math.h>]]) TANF_LIBM="$TAN_LIBM" fi AC_SUBST([TANF_LIBM]) ])