* Fix compilation issues with prereleases of GCC 4.3, at least in theory.

[ginac.git] / acinclude.m4

diff --git a/acinclude.m4 b/acinclude.m4
index 4ab138787626c52d056f02959f489f5ab822c7bc..64f4ec351b971f86141d0b588e25ddd9ba5b57a9 100644 (file)
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -24,8 +24,15 @@ int main()
     fprintf(fd, "%s\n", rl_library_version);
     fclose(fd);
     return 0;
-}], ginac_cv_rlversion=`cat 'conftest.out'`, ginac_cv_rlversion='unknown', ginac_cv_rlversion='4.2')])
+}], [
+dnl Some non-GNU readline implementations have non-numeric rl_library_version
+ginac_cv_rlversion=`sed -e 's/[^0-9.]//g' 'conftest.out'`], [ ginac_cv_rlversion='unknown'], [ ginac_cv_rlversion='4.2'])])
+if test -z "$ginac_cv_rlversion"; then
+       GINAC_WARNING([Unsupported version of libreadline.])
+       ginac_cv_rlversion='unknown'
+fi
 if test "x${ginac_cv_rlversion}" != "xunknown"; then
+       AC_DEFINE(REALLY_HAVE_LIBREADLINE, ,[Define if GNU libreadline is installed])
   RL_VERSION_MAJOR=`echo ${ginac_cv_rlversion} | sed -e 's/\([[0-9]]*\)\.\([[0-9]]*\).*/\1/'`
   AC_DEFINE_UNQUOTED(GINAC_RL_VERSION_MAJOR, $RL_VERSION_MAJOR, [Major version of installed readline library.])
   RL_VERSION_MINOR=`echo ${ginac_cv_rlversion} | sed -e 's/\([[0-9]]*\)\.\([[0-9]]*\).*/\2/'`