Autoconf, CMake: Add a warning flag (-Wundef)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 6c25efa23bfe8ec3c52208cc25258fcab0b14f32..b0e4d8f57a9fc2ec3c717bcd14ab0c2ec4b32c42 100644 (file)
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1023,6 +1023,7 @@ if(EXISTS ${CMAKE_SOURCE_DIR}/.devel OR EXISTS ${CMAKE_BINARY_DIR}/.devel)
         check_and_add_compiler_option(-Wshadow)
         check_and_add_compiler_option(-Wsign-compare)
         check_and_add_compiler_option(-Wstrict-prototypes)
+        check_and_add_compiler_option(-Wundef)
         check_and_add_compiler_option(-Wunreachable-code-return)
         check_and_add_compiler_option(-Wused-but-marked-unused)
         check_and_add_compiler_option(-Wwrite-strings)

diff --git a/aclocal.m4 b/aclocal.m4
index 7ddf4f3a6adee5ecf1e9f88ba663d88e9ae896b6..8a4da331d255c29aada81d2fe6c2f3e3ec3b84a9 100644 (file)
--- a/aclocal.m4
+++ b/aclocal.m4
@@ -762,6 +762,7 @@ AC_DEFUN(AC_LBL_DEVEL,
                    AC_LBL_CHECK_COMPILER_OPT($1, -Wshadow)
                    AC_LBL_CHECK_COMPILER_OPT($1, -Wsign-compare)
                    AC_LBL_CHECK_COMPILER_OPT($1, -Wstrict-prototypes)
+                   AC_LBL_CHECK_COMPILER_OPT($1, -Wundef)
                    AC_LBL_CHECK_COMPILER_OPT($1, -Wunreachable-code-return)
                    AC_LBL_CHECK_COMPILER_OPT($1, -Wunused-but-set-parameter)
                    AC_LBL_CHECK_COMPILER_OPT($1, -Wunused-but-set-variable)