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* Makefile.am (EXTRA_DIST): Add `m4/gnulib-cache.m4'. * build-aux/git-version-gen: Keep unchanged.
32 lines
1 KiB
Text
32 lines
1 KiB
Text
# check-math-lib.m4 serial 4
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dnl Copyright (C) 2007, 2009-2012 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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dnl
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dnl gl_CHECK_MATH_LIB (VARIABLE, EXPRESSION [, EXTRA-CODE])
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dnl
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dnl Sets the shell VARIABLE according to the libraries needed by EXPRESSION
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dnl to compile and link: to the empty string if no extra libraries are needed,
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dnl to "-lm" if -lm is needed, or to "missing" if it does not compile and
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dnl link either way.
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dnl
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dnl Example: gl_CHECK_MATH_LIB([ROUNDF_LIBM], [x = roundf (x);])
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AC_DEFUN([gl_CHECK_MATH_LIB], [
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save_LIBS=$LIBS
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$1=missing
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for libm in "" "-lm"; do
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LIBS="$save_LIBS $libm"
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AC_LINK_IFELSE([AC_LANG_PROGRAM([[
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#ifndef __NO_MATH_INLINES
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# define __NO_MATH_INLINES 1 /* for glibc */
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#endif
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#include <math.h>
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$3
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double x;]],
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[$2])],
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[$1=$libm
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break])
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done
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LIBS=$save_LIBS
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])
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