1# RCSid: 2# $Id: warnings.mk,v 1.8 2014/04/02 19:20:23 sjg Exp $ 3# 4# @(#) Copyright (c) 2002, Simon J. Gerraty 5# 6# This file is provided in the hope that it will 7# be of use. There is absolutely NO WARRANTY. 8# Permission to copy, redistribute or otherwise 9# use this file is hereby granted provided that 10# the above copyright notice and this notice are 11# left intact. 12# 13# Please send copies of changes and bug-fixes to: 14# sjg@crufty.net 15# 16 17.ifndef _w_cflags 18 19# Any number of warnings sets can be added. 20.-include "warnings-sets.mk" 21 22# Modest defaults - put more elaborate sets in warnings-sets.mk 23# -Wunused etc are here so you can set 24# W_unused=-Wno-unused etc. 25MIN_WARNINGS?= -Wall \ 26 -Wformat \ 27 -Wimplicit \ 28 -Wunused \ 29 -Wuninitialized 30 31LOW_WARNINGS?= ${MIN_WARNINGS} -W -Wstrict-prototypes -Wmissing-prototypes 32 33MEDIUM_WARNINGS?= ${LOW_WARNINGS} -Werror 34 35HIGH_WARNINGS?= ${MEDIUM_WARNINGS} \ 36 -Wcast-align \ 37 -Wcast-qual \ 38 -Wparentheses \ 39 -Wpointer-arith \ 40 -Wmissing-declarations \ 41 -Wreturn-type \ 42 -Wswitch \ 43 -Wwrite-strings 44 45EXTRA_WARNINGS?= ${HIGH_WARNINGS} -Wextra 46 47# The two step default makes it easier to test build with different defaults. 48DEFAULT_WARNINGS_SET?= MIN 49WARNINGS_SET?= ${DEFAULT_WARNINGS_SET} 50 51# If you add sets, besure to list them (you don't have to touch this list). 52ALL_WARNINGS_SETS+= MIN LOW MEDIUM HIGH EXTRA 53 54.if !empty(WARNINGS_SET) 55.for ws in ${WARNINGS_SET} 56.if empty(${ws}_WARNINGS) 57.if ${MAKE_VERSION:[1]:C/.*-//} >= 20050530 58.BEGIN: _empty_warnings 59_empty_warnings: .PHONY 60.else 61.BEGIN: 62.endif 63 @echo "ERROR: Invalid: WARNINGS_SET=${ws}" 64 @echo "ERROR: Try one of: ${ALL_WARNINGS_SETS:O:u}"; exit 1 65 66.endif 67.endfor 68.endif 69 70# Without -O or if we've set -O0 somewhere - to make debugging more effective, 71# we need to turn off -Wuninitialized as otherwise we get a warning that 72# -Werror turns into an error. To be safe, set W_uninitialized blank. 73_w_cflags:= ${CFLAGS} ${CPPFLAGS} 74.if ${_w_cflags:M-O*} == "" || ${_w_cflags:M-O0} != "" 75W_uninitialized= 76.endif 77 78 79# .for loops have the [dis]advantage of being evaluated when read, 80# so adding to WARNINGS_SET[_${MACHINE_ARCH}] after this file is 81# read has no effect. 82# Replacing the above .for loops with the WARNINGS+= below solves that 83# but tiggers a double free bug in bmake-20040118 and earlier. 84# Don't try and read this too fast! 85# 86# The first :@ "loop" handles multiple sets in WARNINGS_SET 87# 88# In the second :@ "loop", the ::?= noise sets W_foo?=-Wfoo etc 89# which makes it easy to turn off override individual flags 90# (see W_uninitialized above). 91# 92# The last bit expands to ${W_foo_${.TARGET:T}:U${W_foo}} 93# which is the bit we ultimately want. It allows W_* to be set on a 94# per target basis. 95# 96# NOTE: that we force the target extension to be .o 97# 98 99# define this once, we use it a couple of times below (hence the doubled $$). 100M_warnings_list = @s@$${$$s_WARNINGS}@:O:u:@w@$${$${w:C/-(.)/\1_/}::?=$$w} $${$${w:C/-(.)/\1_/}_${MACHINE_ARCH}_${.TARGET:T:R}.o:U$${$${w:C/-(.)/\1_/}_${.TARGET:T:R}.o:U$${$${w:C/-(.)/\1_/}_${MACHINE_ARCH}:U$${$${w:C/-(.)/\1_/}}}}}@ 101 102# first a list of warnings from the chosen set 103_warnings = ${WARNINGS_SET_${MACHINE_ARCH}:U${WARNINGS_SET}:${M_warnings_list}} 104# now a list of all -Wno-* overrides not just those defined by WARNINGS_SET 105# since things like -Wall imply lots of others. 106# this should be a super-set of the -Wno-* in _warnings, but 107# just in case... 108_no_warnings = ${_warnings:M-Wno-*} ${ALL_WARNINGS_SETS:${M_warnings_list}:M-Wno-*} 109# -Wno-* must follow any others 110WARNINGS += ${_warnings:N-Wno-*} ${_no_warnings:O:u} 111 112.ifndef NO_CFLAGS_WARNINGS 113# Just ${WARNINGS} should do, but this is more flexible? 114CFLAGS+= ${WARNINGS_${.TARGET:T:R}.o:U${WARNINGS}} 115.endif 116 117# it is rather silly that g++ blows up on some warning flags 118NO_CXX_WARNINGS+= \ 119 missing-declarations \ 120 missing-prototypes \ 121 nested-externs \ 122 shadow \ 123 strict-prototypes 124 125.for s in ${SRCS:M*.c*:N*.c:N*h} 126.for w in ${NO_CXX_WARNINGS} 127W_$w_${s:T:R}.o= 128.endfor 129.endfor 130 131.endif # _w_cflags 132