1# expf.m4 serial 2 2dnl Copyright (C) 2011-2014 Free Software Foundation, Inc. 3dnl This file is free software; the Free Software Foundation 4dnl gives unlimited permission to copy and/or distribute it, 5dnl with or without modifications, as long as this notice is preserved. 6 7AC_DEFUN([gl_FUNC_EXPF], 8[ 9 AC_REQUIRE([gl_MATH_H_DEFAULTS]) 10 AC_REQUIRE([gl_FUNC_EXP]) 11 12 dnl Persuade glibc <math.h> to declare expf(). 13 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS]) 14 15 dnl Test whether expf() exists. Assume that expf(), if it exists, is 16 dnl defined in the same library as exp(). 17 save_LIBS="$LIBS" 18 LIBS="$LIBS $EXP_LIBM" 19 AC_CHECK_FUNCS([expf]) 20 LIBS="$save_LIBS" 21 if test $ac_cv_func_expf = yes; then 22 EXPF_LIBM="$EXP_LIBM" 23 else 24 HAVE_EXPF=0 25 EXPF_LIBM="$EXP_LIBM" 26 fi 27 AC_SUBST([EXPF_LIBM]) 28]) 29