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#
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.
# This sets WARNING_CFLAGS for unix-like operating systems.
ifndef CC_NAME
CC_NAME := $(shell $(CC) -? 2>&1 >/dev/null | sed -e 's/:.*//;1q')
export CC_NAME
endif
ifndef WARNING_CFLAGS
# This tests to see if enabling the warning is possible before
# setting an option to disable it.
disable_warning = $(shell $(CC) -x c -E -Werror -W$(1) /dev/null >/dev/null 2>&1 && echo -Wno-$(1))
WARNING_CFLAGS = -Wall
ifeq ($(CC_NAME),clang)
# -Qunused-arguments : clang objects to arguments that it doesn't understand
# and fixing this would require rearchitecture
WARNING_CFLAGS += -Qunused-arguments
# -Wno-parentheses-equality : because clang warns about macro expansions
WARNING_CFLAGS += $(call disable_warning,parentheses-equality)
ifdef BUILD_OPT
# clang is unable to handle glib's expansion of strcmp and similar for optimized
# builds, so ignore the resulting errors.
# See https://llvm.org/bugs/show_bug.cgi?id=20144
WARNING_CFLAGS += $(call disable_warning,array-bounds)
WARNING_CFLAGS += $(call disable_warning,unevaluated-expression)
endif
endif # if clang
ifndef NSS_ENABLE_WERROR
ifeq ($(OS_TARGET),Android)
# Android lollipop generates the following warning:
# error: call to 'sprintf' declared with attribute warning:
# sprintf is often misused; please use snprintf [-Werror]
# So, just suppress -Werror entirely on Android
NSS_ENABLE_WERROR = 0
$(warning OS_TARGET is Android, disabling -Werror)
else
ifeq ($(CC_NAME),clang)
# Clang reports its version as an older gcc, but it's OK
NSS_ENABLE_WERROR = 1
else
CC_VERSION := $(subst ., ,$(shell $(CC) -dumpversion))
ifneq (,$(filter 4.8 4.9,$(word 1,$(CC_VERSION)).$(word 2,$(CC_VERSION))))
NSS_ENABLE_WERROR = 1
endif
ifeq (,$(filter 0 1 2 3 4,$(word 1,$(CC_VERSION))))
NSS_ENABLE_WERROR = 1
endif
ifndef NSS_ENABLE_WERROR
$(warning Unable to find gcc 4.8 or greater, disabling -Werror)
NSS_ENABLE_WERROR = 0
endif
endif
endif
endif #ndef NSS_ENABLE_WERROR
ifeq ($(NSS_ENABLE_WERROR),1)
WARNING_CFLAGS += -Werror
else
# Old versions of gcc (< 4.8) don't support #pragma diagnostic in functions.
# Use this to disable use of that #pragma and the warnings it suppresses.
WARNING_CFLAGS += -DNSS_NO_GCC48
endif
export WARNING_CFLAGS
endif # ndef WARNING_CFLAGS
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