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# check-math-lib.m4 serial 4
dnl Copyright (C) 2007, 2009-2018 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.
dnl
dnl gl_CHECK_MATH_LIB (VARIABLE, EXPRESSION [, EXTRA-CODE])
dnl
dnl Sets the shell VARIABLE according to the libraries needed by EXPRESSION
dnl to compile and link: to the empty string if no extra libraries are needed,
dnl to "-lm" if -lm is needed, or to "missing" if it does not compile and
dnl link either way.
dnl
dnl Example: gl_CHECK_MATH_LIB([ROUNDF_LIBM], [x = roundf (x);])
AC_DEFUN([gl_CHECK_MATH_LIB], [
save_LIBS=$LIBS
$1=missing
for libm in "" "-lm"; do
LIBS="$save_LIBS $libm"
AC_LINK_IFELSE([AC_LANG_PROGRAM([[
#ifndef __NO_MATH_INLINES
# define __NO_MATH_INLINES 1 /* for glibc */
#endif
#include <math.h>
$3
double x;]],
[$2])],
[$1=$libm
break])
done
LIBS=$save_LIBS
])
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