summaryrefslogtreecommitdiff
path: root/gnulib-m4/printf-frexp.m4
diff options
context:
space:
mode:
authorAndreas Rottmann <a.rottmann@gmx.at>2009-09-14 12:32:44 +0200
committerAndreas Rottmann <a.rottmann@gmx.at>2009-09-14 12:32:44 +0200
commitfa095a4504cbe668e4244547e2c141597bea4ecf (patch)
tree06135820a286ffec47804e75fbf8a147e92acd2e /gnulib-m4/printf-frexp.m4
Imported Upstream version 0.9.1upstream/0.9.1
Diffstat (limited to 'gnulib-m4/printf-frexp.m4')
-rw-r--r--gnulib-m4/printf-frexp.m445
1 files changed, 45 insertions, 0 deletions
diff --git a/gnulib-m4/printf-frexp.m4 b/gnulib-m4/printf-frexp.m4
new file mode 100644
index 00000000..fa0aa158
--- /dev/null
+++ b/gnulib-m4/printf-frexp.m4
@@ -0,0 +1,45 @@
+# printf-frexp.m4 serial 3
+dnl Copyright (C) 2007, 2009 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 Check how to define printf_frexp() without linking with libm.
+
+AC_DEFUN([gl_FUNC_PRINTF_FREXP],
+[
+ AC_CACHE_CHECK([whether frexp can be used without linking with libm],
+ [gl_cv_func_frexp_no_libm],
+ [
+ AC_TRY_LINK([#include <math.h>
+ double x;
+ int y;],
+ [return frexp (x, &y) < 1;],
+ [gl_cv_func_frexp_no_libm=yes],
+ [gl_cv_func_frexp_no_libm=no])
+ ])
+ if test $gl_cv_func_frexp_no_libm = yes; then
+ gl_FUNC_FREXP_WORKS
+ case "$gl_cv_func_frexp_works" in
+ *yes)
+ AC_DEFINE([HAVE_FREXP_IN_LIBC], [1],
+ [Define if the frexp function is available in libc.])
+ ;;
+ esac
+ fi
+
+ AC_CACHE_CHECK([whether ldexp can be used without linking with libm],
+ [gl_cv_func_ldexp_no_libm],
+ [
+ AC_TRY_LINK([#include <math.h>
+ double x;
+ int y;],
+ [return ldexp (x, y) < 1;],
+ [gl_cv_func_ldexp_no_libm=yes],
+ [gl_cv_func_ldexp_no_libm=no])
+ ])
+ if test $gl_cv_func_ldexp_no_libm = yes; then
+ AC_DEFINE([HAVE_LDEXP_IN_LIBC], [1],
+ [Define if the ldexp function is available in libc.])
+ fi
+])