Mercurial > gnulib
view m4/check-math-lib.m4 @ 16201:8250f2777afc
maint: update all copyright year number ranges
Run "make update-copyright".
author | Jim Meyering <meyering@redhat.com> |
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date | Sun, 01 Jan 2012 10:04:58 +0100 |
parents | 97fc9a21a8fb |
children | fce13a4b73aa |
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# check-math-lib.m4 serial 3 dnl Copyright (C) 2007, 2009-2012 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) 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> double x;]], [$2])], [$1=$libm break]) done LIBS=$save_LIBS ])