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[pf3gnuchains/pf3gnuchains3x.git] / newlib / libc / configure.in

diff --git a/newlib/libc/configure.in b/newlib/libc/configure.in
index 1a42c13..1254cf6 100644 (file)
--- a/newlib/libc/configure.in
+++ b/newlib/libc/configure.in
@@ -137,6 +137,26 @@ fi
 AC_SUBST(LIBC_SYS_LIB)
 AC_SUBST(sys_dir)
 
+dnl Autoconf 2.59 doesn't support the AC_TYPE_LONG_DOUBLE macro. Instead of:
+dnl   AC_TYPE_LONG_DOUBLE
+dnl   AM_CONDITIONAL(HAVE_LONG_DOUBLE, test x"$ac_cv_type_long_double" = x"yes")
+dnl we specify our own long double test.
+AC_CACHE_CHECK([Checking long double support], [acnewlib_cv_type_long_double],[dnl
+cat > conftest.c <<EOF
+int main() {
+long double x = 0.0L;
+return 0;
+}
+EOF
+if AC_TRY_COMMAND([${CC} $CFLAGS $CPPFLAGS -c conftest.c 1>&AS_MESSAGE_LOG_FD])
+then
+  acnewlib_cv_type_long_double=yes
+else
+  acnewlib_cv_type_long_double=no
+fi
+rm -f conftest*])
+AM_CONDITIONAL(HAVE_LONG_DOUBLE, test x"$acnewlib_cv_type_long_double" = x"yes")
+
 dnl iconv library will be compiled if --enable-newlib-iconv option is enabled
 AM_CONDITIONAL(ENABLE_NEWLIB_ICONV, test x${newlib_iconv} != x)