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: Ic5c8e68b64cd890b3309b4b26c7f22bde1edba83
This commit is contained in:
Neels Hofmeyr 2018-03-05 20:40:05 +01:00 committed by Neels Hofmeyr
parent 10959cdea2
commit 09ecbb7674
1 changed files with 21 additions and 0 deletions

View File

@ -272,6 +272,24 @@ then
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 $WERROR_FLAGS"
fi
CFLAGS="$CFLAGS -DBUILDING_LIBOSMOCORE -Wall"
CPPFLAGS="$CPPFLAGS -DBUILDING_LIBOSMOCORE -Wall"
@ -318,6 +336,9 @@ dnl Check if the compiler supports runtime SIMD detection
CHECK_BUILTIN_SUPPORT([__builtin_cpu_supports],
[Runtime SIMD detection will be disabled])
AC_MSG_RESULT([CFLAGS="$CFLAGS"])
AC_MSG_RESULT([CPPFLAGS="$CPPFLAGS"])
AC_OUTPUT(
libosmocore.pc
libosmocodec.pc