From a26dcd144405e75708f96e41dfd0e30b1d7e079e Mon Sep 17 00:00:00 2001
From: Danny Robson <danny@nerdcruft.net>
Date: Fri, 27 Apr 2012 17:54:26 +1000
Subject: [PATCH] Set a blank CXXFLAGS only if not already present

---
 configure.ac | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/configure.ac b/configure.ac
index 5f8c3d30..0c23ab15 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,11 +1,11 @@
 AC_INIT([libgim], [0.1.0], [danny@nerdcruft.net])
+## Explicitly set an empty CXXFLAGS if not present to prevent AC_PROG_CXX from
+## generating a default -O2. This allows us to manually select -O0 when
+## debugging is enabled.
+: ${CXXFLAGS=""}
 
 AC_CANONICAL_HOST
 
-## We remove CXXFLAGS as autotools inserts them /AFTER/ our own CXXFLAGS,
-## thus overriding any variables that both set (specifically we're concerned
-## about optimisation flags).
-CXXFLAGS="-g"
 AC_PROG_CXX
 AC_LANG([C++])
 LT_INIT