Fix compilation issue with gcc v6.x and empty CXXFLAGS (See rakshasa#10)

ss23 · Jul 30, 2017 · c2b119d · c2b119d
1 parent c167c5a
commit c2b119d
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diff --git a/configure.ac b/configure.ac
@@ -28,6 +28,7 @@ AC_C_BIGENDIAN(
     AC_MSG_ERROR([Could not determine endianness])
 )
 
+RAK_CHECK_CXXFLAGS
 RAK_ENABLE_DEBUG
 RAK_ENABLE_EXTRA_DEBUG
 RAK_ENABLE_WERROR

diff --git a/scripts/rak_compiler.m4 b/scripts/rak_compiler.m4
@@ -1,3 +1,16 @@
+AC_DEFUN([RAK_CHECK_CXXFLAGS], [
+
+  AC_MSG_CHECKING([for user-defined CXXFLAGS])
+
+  if test -n "$CXXFLAGS"; then
+    AC_MSG_RESULT([user-defined "$CXXFLAGS"])
+  else
+    CXXFLAGS="-O2"
+    AC_MSG_RESULT([default "$CXXFLAGS"])
+  fi
+])
+
+
 AC_DEFUN([RAK_ENABLE_DEBUG], [
   AC_ARG_ENABLE(debug,
     AC_HELP_STRING([--enable-debug], [enable debug information [[default=yes]]]),