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149 lines
4.6 KiB
Makefile
149 lines
4.6 KiB
Makefile
# RCSid:
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# $Id: warnings.mk,v 1.7 2009/12/11 17:06:03 sjg Exp $
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#
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# @(#) Copyright (c) 2002, Simon J. Gerraty
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#
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# This file is provided in the hope that it will
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# be of use. There is absolutely NO WARRANTY.
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# Permission to copy, redistribute or otherwise
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# use this file is hereby granted provided that
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# the above copyright notice and this notice are
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# left intact.
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#
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# Please send copies of changes and bug-fixes to:
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# sjg@crufty.net
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#
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.ifndef _w_cflags
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# Any number of warnings sets can be added.
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.-include "warnings-sets.mk"
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# Modest defaults - put more elaborate sets in warnings-sets.mk
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# -Wunused etc are here so you can set
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# W_unused=-Wno-unused etc.
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MIN_WARNINGS?= -Wall \
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-Wformat \
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-Wimplicit \
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-Wunused \
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-Wuninitialized
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LOW_WARNINGS?= ${MIN_WARNINGS} -W -Wstrict-prototypes -Wmissing-prototypes
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MEDIUM_WARNINGS?= ${LOW_WARNINGS} -Werror
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HIGH_WARNINGS?= ${MEDIUM_WARNINGS} \
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-Wcast-align \
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-Wcast-qual \
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-Wparentheses \
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-Wpointer-arith \
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-Wmissing-declarations \
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-Wreturn-type \
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-Wswitch \
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-Wwrite-strings
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# The two step default makes it easier to test build with different defaults.
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DEFAULT_WARNINGS_SET?= MIN
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WARNINGS_SET?= ${DEFAULT_WARNINGS_SET}
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# If you add sets, besure to list them (you don't have to touch this list).
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ALL_WARNINGS_SETS+= MIN LOW MEDIUM HIGH
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.if empty(${WARNINGS_SET}_WARNINGS)
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.if ${MAKE_VERSION:U0:[1]:C/.*-//} >= 20050530
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.BEGIN: _empty_warnings
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_empty_warnings: .PHONY
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.else
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.BEGIN:
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.endif
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@echo "ERROR: Invalid: WARNINGS_SET=${WARNINGS_SET}"
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@echo "ERROR: Try one of: ${ALL_WARNINGS_SETS:O:u}"; exit 1
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.endif
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# Without -O or if we've set -O0 somewhere - to make debugging more effective,
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# we need to turn off -Wuninitialized as otherwise we get a warning that
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# -Werror turns into an error. To be safe, set W_uninitialized blank.
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_w_cflags:= ${CFLAGS} ${CPPFLAGS}
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.if ${_w_cflags:M-O*} == "" || ${_w_cflags:M-O0} != ""
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W_uninitialized=
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.endif
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.if ${MAKE_VERSION:U0:[1]:C/.*-//} <= 20040118
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# This version uses .for loops to avoid a double free bug in old bmake's
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# but the .for loops are sensitive to when this file is read.
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# first, make a list of all the warning flags - doesn't matter if
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# its redundant - we'll sort -u
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_all_sets= ${WARNINGS_SET_${MACHINE_ARCH}} ${WARNINGS_SET} ${ALL_WARNINGS_SETS}
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_all_warnings= ${WARNINGS} ${_all_sets:O:u:@s@${$s_WARNINGS}@}
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# we want to set W_* for each warning so they are easy to turn off.
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# :O:u does a sort -u
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# using :C allows us to handle -f* -w* etc as well as -W*
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.for w in ${_all_warnings:O:u}
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${w:C/-(.)/\1_/} ?= $w
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.endfor
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# Allow for per-target warnings
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# Warning: the WARNINGS+= line below,
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# may make your brain hurt - trust me; it works --sjg
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# the idea is that you can set WARNINGS_SET[_${MACHINE_ARCH}]=HIGH
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# and use one of
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# W_format_mips_foo.o=
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# W_format_foo.o=
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# to turn off -Wformat for foo.o (on mips only in the first case), or
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# W_format_foo.o=-Wformat=2
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# for stricter checking.
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#
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# NOTE: that we force the target extension to be .o
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#
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.for w in ${WARNINGS_SET_${MACHINE_ARCH}:U${WARNINGS_SET}:@s@${$s_WARNINGS}@:O:u}
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WARNINGS+= ${${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_/}}}}}
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.endfor
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.else
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# .for loops have the [dis]advantage of being evaluated when read,
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# so adding to WARNINGS_SET[_${MACHINE_ARCH}] after this file is
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# read has no effect.
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# Replacing the above .for loops with the WARNINGS+= below solves that
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# but tiggers a double free bug in bmake-20040118 and earlier.
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# Don't try and read this too fast!
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#
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# The first :@ "loop" handles multiple sets in WARNINGS_SET
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#
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# In the second :@ "loop", the ::?= noise sets W_foo?=-Wfoo etc
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# which makes it easy to turn off override individual flags
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# (see W_uninitialized above).
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#
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# The last bit expands to ${W_foo_${.TARGET:T}:U${W_foo}}
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# which is the bit we ultimately want. It allows W_* to be set on a
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# per target basis.
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#
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# NOTE: that we force the target extension to be .o
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#
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WARNINGS+= ${WARNINGS_SET_${MACHINE_ARCH}:U${WARNINGS_SET}:@s@${$s_WARNINGS}@:O:u:@w@${${w:C/-(.)/\1_/}::?=$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_/}}}}}@}
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.endif
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.ifndef NO_CFLAGS_WARNINGS
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# Just ${WARNINGS} should do, but this is more flexible?
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CFLAGS+= ${WARNINGS_${.TARGET:T:R}.o:U${WARNINGS}}
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.endif
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# it is rather silly that g++ blows up on some warning flags
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NO_CXX_WARNINGS+= \
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missing-declarations \
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missing-prototypes \
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nested-externs \
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strict-prototypes
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.for s in ${SRCS:M*.cc}
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.for w in ${NO_CXX_WARNINGS}
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W_$w_${s:T:R}.o=
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.endfor
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.endfor
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.endif # _w_cflags
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