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-rw-r--r--gnulib-m4/ldexpl.m4107
1 files changed, 32 insertions, 75 deletions
diff --git a/gnulib-m4/ldexpl.m4 b/gnulib-m4/ldexpl.m4
index 30547db9..d84b50ff 100644
--- a/gnulib-m4/ldexpl.m4
+++ b/gnulib-m4/ldexpl.m4
@@ -1,5 +1,5 @@
-# ldexpl.m4 serial 16
-dnl Copyright (C) 2007-2015 Free Software Foundation, Inc.
+# ldexpl.m4 serial 5
+dnl Copyright (C) 2007-2010 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.
@@ -7,30 +7,29 @@ dnl with or without modifications, as long as this notice is preserved.
AC_DEFUN([gl_FUNC_LDEXPL],
[
AC_REQUIRE([gl_MATH_H_DEFAULTS])
- AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE])
- AC_REQUIRE([gl_FUNC_ISNANL]) dnl for ISNANL_LIBM
-
- dnl Persuade glibc <math.h> to declare ldexpl().
- AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
-
dnl Check whether it's declared.
- dnl Mac OS X 10.3 has ldexpl() in libc but doesn't declare it in <math.h>.
- AC_CHECK_DECL([ldexpl], , [HAVE_DECL_LDEXPL=0], [[#include <math.h>]])
-
+ dnl MacOS X 10.3 has ldexpl() in libc but doesn't declare it in <math.h>.
+ AC_CHECK_DECL([ldexpl], , [HAVE_DECL_LDEXPL=0], [#include <math.h>])
LDEXPL_LIBM=
if test $HAVE_DECL_LDEXPL = 1; then
- gl_CHECK_LDEXPL_NO_LIBM
+ AC_CACHE_CHECK([whether ldexpl() can be used without linking with libm],
+ [gl_cv_func_ldexpl_no_libm],
+ [
+ AC_TRY_LINK([#include <math.h>
+ long double x;],
+ [return ldexpl (x, -1) > 0;],
+ [gl_cv_func_ldexpl_no_libm=yes],
+ [gl_cv_func_ldexpl_no_libm=no])
+ ])
if test $gl_cv_func_ldexpl_no_libm = no; then
AC_CACHE_CHECK([whether ldexpl() can be used with libm],
[gl_cv_func_ldexpl_in_libm],
[
save_LIBS="$LIBS"
LIBS="$LIBS -lm"
- AC_LINK_IFELSE(
- [AC_LANG_PROGRAM(
- [[#include <math.h>
- long double x;]],
- [[return ldexpl (x, -1) > 0;]])],
+ AC_TRY_LINK([#include <math.h>
+ long double x;],
+ [return ldexpl (x, -1) > 0;],
[gl_cv_func_ldexpl_in_libm=yes],
[gl_cv_func_ldexpl_in_libm=no])
LIBS="$save_LIBS"
@@ -47,7 +46,7 @@ AC_DEFUN([gl_FUNC_LDEXPL],
LIBS="$save_LIBS"
case "$gl_cv_func_ldexpl_works" in
*yes) gl_func_ldexpl=yes ;;
- *) gl_func_ldexpl=no; REPLACE_LDEXPL=1 ;;
+ *) gl_func_ldexpl=no; REPLACE_LDEXPL=1; LDEXPL_LIBM= ;;
esac
else
gl_func_ldexpl=no
@@ -58,76 +57,34 @@ AC_DEFUN([gl_FUNC_LDEXPL],
fi
fi
if test $HAVE_DECL_LDEXPL = 0 || test $gl_func_ldexpl = no; then
- dnl Find libraries needed to link lib/ldexpl.c.
- if test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 1; then
- AC_REQUIRE([gl_FUNC_LDEXP])
- LDEXPL_LIBM="$LDEXP_LIBM"
- else
- LDEXPL_LIBM="$ISNANL_LIBM"
- fi
+ AC_LIBOBJ([ldexpl])
fi
AC_SUBST([LDEXPL_LIBM])
])
-dnl Test whether ldexpl() can be used without linking with libm.
-dnl Set gl_cv_func_ldexpl_no_libm to 'yes' or 'no' accordingly.
-AC_DEFUN([gl_CHECK_LDEXPL_NO_LIBM],
-[
- AC_CACHE_CHECK([whether ldexpl() can be used without linking with libm],
- [gl_cv_func_ldexpl_no_libm],
- [
- AC_LINK_IFELSE(
- [AC_LANG_PROGRAM(
- [[#include <math.h>
- long double x;]],
- [[return ldexpl (x, -1) > 0;]])],
- [gl_cv_func_ldexpl_no_libm=yes],
- [gl_cv_func_ldexpl_no_libm=no])
- ])
-])
-
dnl Test whether ldexpl() works on finite numbers (this fails on AIX 5.1
-dnl and Mac OS X 10.4/PowerPC).
+dnl and MacOS X 10.4/PowerPC).
AC_DEFUN([gl_FUNC_LDEXPL_WORKS],
[
AC_REQUIRE([AC_PROG_CC])
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CACHE_CHECK([whether ldexpl works], [gl_cv_func_ldexpl_works],
[
- AC_RUN_IFELSE(
- [AC_LANG_SOURCE([[
+ AC_TRY_RUN([
#include <math.h>
-extern
-#ifdef __cplusplus
-"C"
-#endif
-long double ldexpl (long double, int);
+extern long double ldexpl (long double, int);
int main()
{
- int result = 0;
- {
- volatile long double x = 1.0;
- volatile long double y = ldexpl (x, -1);
- if (y != 0.5L)
- result |= 1;
- }
- {
- volatile long double x = 1.73205L;
- volatile long double y = ldexpl (x, 0);
- if (y != x)
- result |= 2;
- }
- return result;
-}]])],
- [gl_cv_func_ldexpl_works=yes],
- [gl_cv_func_ldexpl_works=no],
- [
-changequote(,)dnl
- case "$host_os" in
- aix | aix[3-6]*) gl_cv_func_ldexpl_works="guessing no";;
- *) gl_cv_func_ldexpl_works="guessing yes";;
- esac
-changequote([,])dnl
- ])
+ volatile long double x1 = 1.0;
+ volatile long double y1 = ldexpl (x1, -1);
+ volatile long double x2 = 1.73205L;
+ volatile long double y2 = ldexpl (x2, 0);
+ return (y1 != 0.5L) || (y2 != x2);
+}], [gl_cv_func_ldexpl_works=yes], [gl_cv_func_ldexpl_works=no],
+ [case "$host_os" in
+ aix*) gl_cv_func_ldexpl_works="guessing no";;
+ *) gl_cv_func_ldexpl_works="guessing yes";;
+ esac
+ ])
])
])