Neels Hofmeyr has submitted this change and it was merged.

Change subject: configure: add --enable-werror
......................................................................


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
---
M configure.ac
1 file changed, 20 insertions(+), 0 deletions(-)

Approvals:
  Neels Hofmeyr: Looks good to me, approved
  Jenkins Builder: Verified



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

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Gerrit-MessageType: merged
Gerrit-Change-Id: I20d5f18cf05c9e277d914ada259a95187b73fe39
Gerrit-PatchSet: 1
Gerrit-Project: libosmo-abis
Gerrit-Branch: master
Gerrit-Owner: Neels Hofmeyr <nhofm...@sysmocom.de>
Gerrit-Reviewer: Jenkins Builder
Gerrit-Reviewer: Neels Hofmeyr <nhofm...@sysmocom.de>

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