gcc-warnings.gmk

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#
#
#
# Copyright  1990-2008 Sun Microsystems, Inc. All Rights Reserved.
# DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
# 
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License version
# 2 only, as published by the Free Software Foundation.
# 
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License version 2 for more details (a copy is
# included at /legal/license.txt).
# 
# You should have received a copy of the GNU General Public License
# version 2 along with this work; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
# 02110-1301 USA
# 
# Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
# Clara, CA 95054 or visit www.sun.com if you need additional
# information or have any questions.
#
######################################################################
#
# GCC warnings
#
######################################################################
#
# Newer GCC versions usually issue more warnings about suspicious
# places in the code. Often it is easy to modify the code
# so that the warning disappears, while sometimes the code is correct,
# but a serious refactoring is required to avoid the warning.
# Because of the "warnings as errors" policy of the project,
# we need a way to selectively disable some warnings.
# In particular, we need to disable -Wuninitialized because we
# do not want to add unnecessary initialization of arrays
# in the code that affects performance.

# all warnings by default
USE_WEAK_GCC_WARNINGS = false

ifneq ($(USE_WEAK_GCC_WARNINGS), true)
  # just all+extra warnings
  GCC_WARNING_FLAGS = -W -Wall
else
  # deselect warnings that cause problems with GCC version >= 4.2
  # !!! the order is important: -Wno-something *after* -Wall
  GCC_WARNING_FLAGS = -W -Wall -Wno-uninitialized
endif

EXTRA_CFLAGS += $(GCC_WARNING_FLAGS)