configure: add '-Wundef' to warning flags

[lttng-tools.git] / configure.ac

diff --git a/configure.ac b/configure.ac
index c04a3cbb88fe27f3bd8bf86d69a7b2062abcef8f..5a63255c4549435a3594c08d996642ba73b130ea 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -60,6 +60,7 @@ AC_TYPE_UINT8_T
 m4_define([WARN_FLAGS_COMMON_LIST], [ dnl
   -Wall dnl
   -Wnull-dereference dnl
+  -Wundef dnl
   dnl We currently get this warning when building with Clang:
   dnl
   dnl /usr/include/setjmp.h:54:12: error: declaration of built-in function '__sigsetjmp' requires the declaration of the 'jmp_buf' type, commonly provided in the header <setjmp.h>. [-Werror,-Wincomplete-setjmp-declaration]