configure: add --enable-werror
Provide a sane means of adding the -Werror compiler flag.
Currently, some of our jenkins.sh add -Werror by passing 'CFLAGS="-Werror"',
but that actually *overwrites* all the other CFLAGS we might want to have set.
Maintain these exceptions from -Werror:
a) deprecation (allow upstream to mark deprecation without breaking builds);
b) "#warning" pragmas (allow to remind ourselves of errors without breaking
builds)
As a last configure step before generating the output files, print the complete
CFLAGS and CPPFLAGS by means of AC_MSG_RESULT.
Change-Id: I20d5f18cf05c9e277d914ada259a95187b73fe39
diff --git a/configure.ac b/configure.ac
index 0e07330..ce4bf39 100644
--- a/configure.ac
+++ b/configure.ac
@@ -78,6 +78,24 @@
CPPFLAGS="$CPPFLAGS -fsanitize=address -fsanitize=undefined"
fi
+AC_ARG_ENABLE(werror,
+ [AS_HELP_STRING(
+ [--enable-werror],
+ [Turn all compiler warnings into errors, with exceptions:
+ a) deprecation (allow upstream to mark deprecation without breaking builds);
+ b) "#warning" pragmas (allow to remind ourselves of errors without breaking builds)
+ ]
+ )],
+ [werror=$enableval], [werror="no"])
+if test x"$werror" = x"yes"
+then
+ WERROR_FLAGS="-Werror"
+ WERROR_FLAGS+=" -Wno-error=deprecated -Wno-error=deprecated-declarations"
+ WERROR_FLAGS+=" -Wno-error=cpp" # "#warning"
+ CFLAGS="$CFLAGS $WERROR_FLAGS"
+ CPPFLAGS="$CPPFLAGS $WERROR_FLAGS"
+fi
+
_cflags_save=$CFLAGS
CFLAGS="$CFLAGS $ORTP_CFLAGS"
AC_COMPILE_IFELSE(
@@ -105,6 +123,8 @@
[rtp_session_signal_connect requires ulong parameter])])
CFLAGS=$_cflags_save
+AC_MSG_RESULT([CFLAGS="$CFLAGS"])
+AC_MSG_RESULT([CPPFLAGS="$CPPFLAGS"])
AC_OUTPUT(
libosmoabis.pc