[PATCH] osmo-pcu[master]: configure: add --enable-werror

[Neels Hofmeyr]

Review at  https://gerrit.osmocom.org/7118

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: I0f735913fc3bbda695c4e66449dcfc94f417dafb
---
M configure.ac
1 file changed, 21 insertions(+), 0 deletions(-)


  git pull ssh://gerrit.osmocom.org:29418/osmo-pcu refs/changes/18/7118/1

diff --git a/configure.ac b/configure.ac
index 3706b6c..8cddd1a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -45,6 +45,24 @@
 	LDFLAGS="$LDFLAGS -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 $WERROR_FLAGS"
+fi
+
 AC_ARG_ENABLE(profile,
 		[AS_HELP_STRING([--enable-profile], [Compile with profiling support enabled], )],
 		[profile=$enableval], [profile="no"])
@@ -116,6 +134,9 @@
 STD_DEFINES_AND_INCLUDES="-Wall"
 AC_SUBST(STD_DEFINES_AND_INCLUDES)
 
+AC_MSG_RESULT([CFLAGS="$CFLAGS"])
+AC_MSG_RESULT([CPPFLAGS="$CPPFLAGS"])
+
 AC_OUTPUT(
     osmo-pcu.pc
     include/Makefile

-- 
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Gerrit-MessageType: newchange
Gerrit-Change-Id: I0f735913fc3bbda695c4e66449dcfc94f417dafb
Gerrit-PatchSet: 1
Gerrit-Project: osmo-pcu
Gerrit-Branch: master
Gerrit-Owner: Neels Hofmeyr <nhofmeyr at sysmocom.de>