Likewise for ldexpl, although the use of a dangerous idiom did not lead to
a test compilation error on Solaris 8 and Cygwin this time.
2010-04-05 Bruno Haible <br...@clisp.org>
ldexpl: Improve idiom.
* m4/ldexpl.m4 (gl_FUNC_LDEXPL): When the function is not declared,
make sure to set HAVE_DECL_LDEXPL to 0.
*** m4/ldexpl.m4.orig Mon Apr 5 11:49:22 2010
--- m4/ldexpl.m4 Mon Apr 5 01:53:14 2010
***************
*** 1,4 ****
! # ldexpl.m4 serial 4
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,
--- 1,4 ----
! # 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,
***************
*** 7,60 ****
AC_DEFUN([gl_FUNC_LDEXPL],
[
AC_REQUIRE([gl_MATH_H_DEFAULTS])
LDEXPL_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="$LIBS -lm"
AC_TRY_LINK([#include <math.h>
long double x;],
[return ldexpl (x, -1) > 0;],
! [gl_cv_func_ldexpl_in_libm=yes],
! [gl_cv_func_ldexpl_in_libm=no])
! LIBS="$save_LIBS"
])
! if test $gl_cv_func_ldexpl_in_libm = yes; then
! LDEXPL_LIBM=-lm
fi
fi
! if test $gl_cv_func_ldexpl_no_libm = yes \
! || test $gl_cv_func_ldexpl_in_libm = yes; then
! save_LIBS="$LIBS"
! LIBS="$LIBS $LDEXPL_LIBM"
! gl_FUNC_LDEXPL_WORKS
! LIBS="$save_LIBS"
! case "$gl_cv_func_ldexpl_works" in
! *yes) gl_func_ldexpl=yes ;;
! *) gl_func_ldexpl=no; REPLACE_LDEXPL=1; LDEXPL_LIBM= ;;
! esac
! else
! gl_func_ldexpl=no
! fi
! if test $gl_func_ldexpl = yes; then
! AC_DEFINE([HAVE_LDEXPL], [1],
! [Define if the ldexpl() function is available.])
! dnl Also check whether it's declared.
! 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>])
! else
! HAVE_DECL_LDEXPL=0
AC_LIBOBJ([ldexpl])
fi
AC_SUBST([LDEXPL_LIBM])
--- 7,62 ----
AC_DEFUN([gl_FUNC_LDEXPL],
[
AC_REQUIRE([gl_MATH_H_DEFAULTS])
+ dnl Check whether it's declared.
+ 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
! 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="$LIBS -lm"
! AC_TRY_LINK([#include <math.h>
! long double x;],
! [return ldexpl (x, -1) > 0;],
! [gl_cv_func_ldexpl_in_libm=yes],
! [gl_cv_func_ldexpl_in_libm=no])
! LIBS="$save_LIBS"
! ])
! if test $gl_cv_func_ldexpl_in_libm = yes; then
! LDEXPL_LIBM=-lm
! fi
! fi
! if test $gl_cv_func_ldexpl_no_libm = yes \
! || test $gl_cv_func_ldexpl_in_libm = yes; then
! save_LIBS="$LIBS"
! LIBS="$LIBS $LDEXPL_LIBM"
! gl_FUNC_LDEXPL_WORKS
! LIBS="$save_LIBS"
! case "$gl_cv_func_ldexpl_works" in
! *yes) gl_func_ldexpl=yes ;;
! *) gl_func_ldexpl=no; REPLACE_LDEXPL=1; LDEXPL_LIBM= ;;
! esac
! else
! gl_func_ldexpl=no
! fi
! if test $gl_func_ldexpl = yes; then
! AC_DEFINE([HAVE_LDEXPL], [1],
! [Define if the ldexpl() function is available.])
fi
fi
! if test $HAVE_DECL_LDEXPL = 0 || test $gl_func_ldexpl = no; then
AC_LIBOBJ([ldexpl])
fi
AC_SUBST([LDEXPL_LIBM])
