From de37729db32e7d10d7c7e15fcb9ace26e6c98f2c Mon Sep 17 00:00:00 2001
From: Jean-Paul Chaput <Jean-Paul.Chaput@lip6.fr>
Date: Wed, 16 Oct 2002 08:54:26 +0000
Subject: [PATCH]  * ./oldgcc.m4,    ./nero/configure.in :    - Detection des
 incompatibilites de version de g++ grace a "oldgcc.m4"       (thanks
 Christophe Alexandre).

---
 alliance/src/nero/configure.in |  1 +
 alliance/src/oldgcc.m4         | 30 ++++++++++++++++++++++++++++++
 2 files changed, 31 insertions(+)
 create mode 100644 alliance/src/oldgcc.m4

diff --git a/alliance/src/nero/configure.in b/alliance/src/nero/configure.in
index 88c519a6..79f44991 100644
--- a/alliance/src/nero/configure.in
+++ b/alliance/src/nero/configure.in
@@ -21,6 +21,7 @@ AC_PROG_CXX
 AC_PROG_CC
 AC_PROG_RANLIB
 AC_PROG_MAKE_SET
+ALC_CXX_PROBLEMATIC_OLD_VERSION
 
 AC_CHECK_LIB(m, pow)
 
diff --git a/alliance/src/oldgcc.m4 b/alliance/src/oldgcc.m4
new file mode 100644
index 00000000..cce2c0fc
--- /dev/null
+++ b/alliance/src/oldgcc.m4
@@ -0,0 +1,30 @@
+AC_DEFUN(ALC_CXX_PROBLEMATIC_OLD_VERSION,
+[
+AC_REQUIRE([AC_PROG_CXX])
+AC_MSG_CHECKING(if this is a problematic old ${CXX} version)
+AC_CACHE_VAL(alc_cv_cxx_problematic_version,
+[
+AC_LANG_SAVE
+AC_LANG_CPLUSPLUS
+AC_TRY_CPP([
+#ifdef __GNUC__
+#if __GNUC__ < 2
+#error ALC works best with GCC version 2.95.2 or higher
+#endif /* __GNUC__ < 2 */
+#ifdef __GNUC_MINOR__
+#if __GNUC__ == 2 && __GNUC_MINOR__ < 95
+#error ALC works only with GCC version 2.95.2 or higher
+#endif /* __GNUC_MINOR__ < 95.2 */
+#endif /* defined(__GNUC_MINOR__) */
+#endif /* defined(__GNUC__) */
+],
+alc_cv_cxx_problematic_version=no, alc_cv_cxx_problematic_version=yes)
+AC_LANG_RESTORE
+])
+AC_MSG_RESULT($alc_cv_cxx_problematic_version)
+if test "$alc_cv_cxx_problematic_version" = yes; then
+AC_MSG_ERROR(*** This package works only with ${CXX} version 2.95.2 or higher ... please install gcc 2.95.2 or higher or set the environment variable CC and CXX to the good gcc before running the configure script ***)
+fi
+])dnl
+dnl
+dnl