Mercurial > gnulib
view m4/check-math-lib.m4 @ 17249:e542fd46ad6f
maint: update all copyright year number ranges
Run "make update-copyright". Compare to commit 1602f0a from last year.
Signed-off-by: Eric Blake <eblake@redhat.com>
author | Eric Blake <eblake@redhat.com> |
---|---|
date | Tue, 01 Jan 2013 00:50:58 +0000 |
parents | fce13a4b73aa |
children | 344018b6e5d7 |
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# check-math-lib.m4 serial 4 dnl Copyright (C) 2007, 2009-2013 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 ])