xref: /freebsd/share/mk/bsd.sys.mk (revision 110f229794b4b31ee0fd6568fda89002b26664c8) 
1# $FreeBSD$
2#
3# This file contains common settings used for building FreeBSD
4# sources.
5
6# Enable various levels of compiler warning checks.  These may be
7# overridden (e.g. if using a non-gcc compiler) by defining MK_WARNS=no.
8
9# for 4.2.1 GCC:   http://gcc.gnu.org/onlinedocs/gcc-4.2.1/gcc/Warning-Options.html
10# for current GCC: https://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html
11# for clang: https://clang.llvm.org/docs/DiagnosticsReference.html
12
13.include <bsd.compiler.mk>
14
15# the default is gnu99 for now
16CSTD?=		gnu99
17
18.if ${CSTD} == "c89" || ${CSTD} == "c90"
19CFLAGS+=	-std=iso9899:1990
20.elif ${CSTD} == "c94" || ${CSTD} == "c95"
21CFLAGS+=	-std=iso9899:199409
22.elif ${CSTD} == "c99"
23CFLAGS+=	-std=iso9899:1999
24.else # CSTD
25CFLAGS+=	-std=${CSTD}
26.endif # CSTD
27
28.if !empty(CXXSTD)
29CXXFLAGS+=	-std=${CXXSTD}
30.endif
31
32#
33# Turn off -Werror for gcc 4.2.1. The compiler is on the glide path out of the
34# system, and any warnings specific to it are no longer relevant as there are
35# too many false positives.
36#
37.if ${COMPILER_VERSION} <  50000
38NO_WERROR.gcc=	yes
39.endif
40
41# -pedantic is problematic because it also imposes namespace restrictions
42#CFLAGS+=	-pedantic
43.if defined(WARNS)
44.if ${WARNS} >= 1
45CWARNFLAGS+=	-Wsystem-headers
46.if !defined(NO_WERROR) && !defined(NO_WERROR.${COMPILER_TYPE})
47CWARNFLAGS+=	-Werror
48.endif # !NO_WERROR && !NO_WERROR.${COMPILER_TYPE}
49.endif # WARNS >= 1
50.if ${WARNS} >= 2
51CWARNFLAGS+=	-Wall -Wno-format-y2k
52.endif # WARNS >= 2
53.if ${WARNS} >= 3
54CWARNFLAGS+=	-W -Wno-unused-parameter -Wstrict-prototypes\
55		-Wmissing-prototypes -Wpointer-arith
56.endif # WARNS >= 3
57.if ${WARNS} >= 4
58CWARNFLAGS+=	-Wreturn-type -Wcast-qual -Wwrite-strings -Wswitch -Wshadow\
59		-Wunused-parameter
60.if !defined(NO_WCAST_ALIGN) && !defined(NO_WCAST_ALIGN.${COMPILER_TYPE})
61CWARNFLAGS+=	-Wcast-align
62.endif # !NO_WCAST_ALIGN !NO_WCAST_ALIGN.${COMPILER_TYPE}
63.endif # WARNS >= 4
64.if ${WARNS} >= 6
65CWARNFLAGS+=	-Wchar-subscripts -Winline -Wnested-externs -Wredundant-decls\
66		-Wold-style-definition
67.if !defined(NO_WMISSING_VARIABLE_DECLARATIONS)
68CWARNFLAGS.clang+=	-Wmissing-variable-declarations
69.endif
70.if !defined(NO_WTHREAD_SAFETY)
71CWARNFLAGS.clang+=	-Wthread-safety
72.endif
73.endif # WARNS >= 6
74.if ${WARNS} >= 2 && ${WARNS} <= 4
75# XXX Delete -Wuninitialized by default for now -- the compiler doesn't
76# XXX always get it right.
77CWARNFLAGS+=	-Wno-uninitialized
78.endif # WARNS >=2 && WARNS <= 4
79CWARNFLAGS+=	-Wno-pointer-sign
80# Clang has more warnings enabled by default, and when using -Wall, so if WARNS
81# is set to low values, these have to be disabled explicitly.
82.if ${WARNS} <= 6
83CWARNFLAGS.clang+=	-Wno-empty-body -Wno-string-plus-int
84.if ${COMPILER_TYPE} == "clang" && ${COMPILER_VERSION} >= 30400
85CWARNFLAGS.clang+=	-Wno-unused-const-variable
86.endif
87.endif # WARNS <= 6
88.if ${WARNS} <= 3
89CWARNFLAGS.clang+=	-Wno-tautological-compare -Wno-unused-value\
90		-Wno-parentheses-equality -Wno-unused-function -Wno-enum-conversion
91.if ${COMPILER_TYPE} == "clang" && ${COMPILER_VERSION} >= 30600
92CWARNFLAGS.clang+=	-Wno-unused-local-typedef
93.endif
94.if ${COMPILER_TYPE} == "clang" && ${COMPILER_VERSION} >= 40000
95CWARNFLAGS.clang+=	-Wno-address-of-packed-member
96.endif
97.if ${COMPILER_TYPE} == "clang" && ${COMPILER_VERSION} >= 70000 && \
98    ${MACHINE_CPUARCH} == "arm" && !${MACHINE_ARCH:Marmv[67]*}
99CWARNFLAGS.clang+=	-Wno-atomic-alignment
100.endif
101.endif # WARNS <= 3
102.if ${WARNS} <= 2
103CWARNFLAGS.clang+=	-Wno-switch -Wno-switch-enum -Wno-knr-promoted-parameter
104.endif # WARNS <= 2
105.if ${WARNS} <= 1
106CWARNFLAGS.clang+=	-Wno-parentheses
107.endif # WARNS <= 1
108.if defined(NO_WARRAY_BOUNDS)
109CWARNFLAGS.clang+=	-Wno-array-bounds
110.endif # NO_WARRAY_BOUNDS
111.endif # WARNS
112
113.if defined(FORMAT_AUDIT)
114WFORMAT=	1
115.endif # FORMAT_AUDIT
116.if defined(WFORMAT)
117.if ${WFORMAT} > 0
118#CWARNFLAGS+=	-Wformat-nonliteral -Wformat-security -Wno-format-extra-args
119CWARNFLAGS+=	-Wformat=2 -Wno-format-extra-args
120.if ${WARNS} <= 3
121CWARNFLAGS.clang+=	-Wno-format-nonliteral
122.endif # WARNS <= 3
123.if !defined(NO_WERROR) && !defined(NO_WERROR.${COMPILER_TYPE})
124CWARNFLAGS+=	-Werror
125.endif # !NO_WERROR && !NO_WERROR.${COMPILER_TYPE}
126.endif # WFORMAT > 0
127.endif # WFORMAT
128.if defined(NO_WFORMAT) || defined(NO_WFORMAT.${COMPILER_TYPE})
129CWARNFLAGS+=	-Wno-format
130.endif # NO_WFORMAT || NO_WFORMAT.${COMPILER_TYPE}
131
132# GCC 5.2.0
133.if ${COMPILER_TYPE} == "gcc" && ${COMPILER_VERSION} >= 50200
134CWARNFLAGS+=	-Wno-error=address			\
135		-Wno-error=array-bounds			\
136		-Wno-error=attributes			\
137		-Wno-error=bool-compare			\
138		-Wno-error=cast-align			\
139		-Wno-error=clobbered			\
140		-Wno-error=enum-compare			\
141		-Wno-error=extra			\
142		-Wno-error=inline			\
143		-Wno-error=logical-not-parentheses	\
144		-Wno-error=strict-aliasing		\
145		-Wno-error=uninitialized		\
146		-Wno-error=unused-but-set-variable	\
147		-Wno-error=unused-function		\
148		-Wno-error=unused-value
149.endif
150
151# GCC 6.1.0
152.if ${COMPILER_TYPE} == "gcc" && ${COMPILER_VERSION} >= 60100
153CWARNFLAGS+=	-Wno-error=misleading-indentation	\
154		-Wno-error=nonnull-compare		\
155		-Wno-error=shift-negative-value		\
156		-Wno-error=tautological-compare		\
157		-Wno-error=unused-const-variable
158.endif
159
160# GCC 7.1.0
161.if ${COMPILER_TYPE} == "gcc" && ${COMPILER_VERSION} >= 70100
162CWARNFLAGS+=	-Wno-error=bool-operation		\
163		-Wno-error=deprecated			\
164		-Wno-error=expansion-to-defined		\
165		-Wno-error=format-overflow		\
166		-Wno-error=format-truncation		\
167		-Wno-error=implicit-fallthrough		\
168		-Wno-error=int-in-bool-context		\
169		-Wno-error=memset-elt-size		\
170		-Wno-error=noexcept-type		\
171		-Wno-error=nonnull			\
172		-Wno-error=pointer-compare		\
173		-Wno-error=stringop-overflow
174.endif
175
176# GCC 8.1.0
177.if ${COMPILER_TYPE} == "gcc" && ${COMPILER_VERSION} >= 80100
178CWARNFLAGS+=	-Wno-error=aggressive-loop-optimizations	\
179		-Wno-error=cast-function-type			\
180		-Wno-error=catch-value				\
181		-Wno-error=multistatement-macros		\
182		-Wno-error=restrict				\
183		-Wno-error=sizeof-pointer-memaccess		\
184		-Wno-error=stringop-truncation
185.endif
186
187# How to handle FreeBSD custom printf format specifiers.
188.if ${COMPILER_TYPE} == "clang" && ${COMPILER_VERSION} >= 30600
189FORMAT_EXTENSIONS=	-D__printf__=__freebsd_kprintf__
190.else
191FORMAT_EXTENSIONS=	-fformat-extensions
192.endif
193
194.if defined(IGNORE_PRAGMA)
195CWARNFLAGS+=	-Wno-unknown-pragmas
196.endif # IGNORE_PRAGMA
197
198# This warning is utter nonsense
199CFLAGS+=	-Wno-format-zero-length
200
201# We need this conditional because many places that use it
202# only enable it for some files with CLFAGS.$FILE+=${CLANG_NO_IAS}.
203# unconditionally, and can't easily use the CFLAGS.clang=
204# mechanism.
205.if ${COMPILER_TYPE} == "clang"
206CLANG_NO_IAS=	 -no-integrated-as
207.endif
208CLANG_OPT_SMALL= -mstack-alignment=8 -mllvm -inline-threshold=3\
209		 -mllvm -simplifycfg-dup-ret
210.if ${COMPILER_VERSION} >= 30500 && ${COMPILER_VERSION} < 30700
211CLANG_OPT_SMALL+= -mllvm -enable-gvn=false
212.else
213CLANG_OPT_SMALL+= -mllvm -enable-load-pre=false
214.endif
215CFLAGS.clang+=	 -Qunused-arguments
216.if ${MACHINE_CPUARCH} == "sparc64"
217# Don't emit .cfi directives, since we must use GNU as on sparc64, for now.
218CFLAGS.clang+=	 -fno-dwarf2-cfi-asm
219.endif # SPARC64
220# The libc++ headers use c++11 extensions.  These are normally silenced because
221# they are treated as system headers, but we explicitly disable that warning
222# suppression when building the base system to catch bugs in our headers.
223# Eventually we'll want to start building the base system C++ code as C++11,
224# but not yet.
225CXXFLAGS.clang+=	 -Wno-c++11-extensions
226
227.if ${MK_SSP} != "no" && \
228    ${MACHINE_CPUARCH} != "arm" && ${MACHINE_CPUARCH} != "mips"
229.if (${COMPILER_TYPE} == "clang" && ${COMPILER_VERSION} >= 30500) || \
230    (${COMPILER_TYPE} == "gcc" && \
231     (${COMPILER_VERSION} == 40201 || ${COMPILER_VERSION} >= 40900))
232# Don't use -Wstack-protector as it breaks world with -Werror.
233SSP_CFLAGS?=	-fstack-protector-strong
234.else
235SSP_CFLAGS?=	-fstack-protector
236.endif
237CFLAGS+=	${SSP_CFLAGS}
238.endif # SSP && !ARM && !MIPS
239
240# Additional flags passed in CFLAGS and CXXFLAGS when MK_DEBUG_FILES is
241# enabled.
242DEBUG_FILES_CFLAGS?= -g
243
244# Allow user-specified additional warning flags, plus compiler and file
245# specific flag overrides, unless we've overridden this...
246.if ${MK_WARNS} != "no"
247CFLAGS+=	${CWARNFLAGS:M*} ${CWARNFLAGS.${COMPILER_TYPE}}
248CFLAGS+=	${CWARNFLAGS.${.IMPSRC:T}}
249CXXFLAGS+=	${CXXWARNFLAGS:M*} ${CXXWARNFLAGS.${COMPILER_TYPE}}
250CXXFLAGS+=	${CXXWARNFLAGS.${.IMPSRC:T}}
251.endif
252
253CFLAGS+=	 ${CFLAGS.${COMPILER_TYPE}}
254CXXFLAGS+=	 ${CXXFLAGS.${COMPILER_TYPE}}
255
256AFLAGS+=	${AFLAGS.${.IMPSRC:T}}
257AFLAGS+=	${AFLAGS.${.TARGET:T}}
258ACFLAGS+=	${ACFLAGS.${.IMPSRC:T}}
259ACFLAGS+=	${ACFLAGS.${.TARGET:T}}
260CFLAGS+=	${CFLAGS.${.IMPSRC:T}}
261CXXFLAGS+=	${CXXFLAGS.${.IMPSRC:T}}
262
263LDFLAGS+=	${LDFLAGS.${LINKER_TYPE}}
264
265# Only allow .TARGET when not using PROGS as it has the same syntax
266# per PROG which is ambiguous with this syntax. This is only needed
267# for PROG_VARS vars.
268.if !defined(_RECURSING_PROGS)
269.if ${MK_WARNS} != "no"
270CFLAGS+=	${CWARNFLAGS.${.TARGET:T}}
271.endif
272CFLAGS+=	${CFLAGS.${.TARGET:T}}
273CXXFLAGS+=	${CXXFLAGS.${.TARGET:T}}
274LDFLAGS+=	${LDFLAGS.${.TARGET:T}}
275LDADD+=		${LDADD.${.TARGET:T}}
276LIBADD+=	${LIBADD.${.TARGET:T}}
277.endif
278
279.if defined(SRCTOP)
280# Prevent rebuilding during install to support read-only objdirs.
281.if ${.TARGETS:M*install*} == ${.TARGETS} && empty(.MAKE.MODE:Mmeta)
282CFLAGS+=	ERROR-tried-to-rebuild-during-make-install
283.endif
284.endif
285
286# Tell bmake not to mistake standard targets for things to be searched for
287# or expect to ever be up-to-date.
288PHONY_NOTMAIN = analyze afterdepend afterinstall all beforedepend beforeinstall \
289		beforelinking build build-tools buildconfig buildfiles \
290		buildincludes check checkdpadd clean cleandepend cleandir \
291		cleanobj configure depend distclean distribute exe \
292		files html includes install installconfig installdirs \
293		installfiles installincludes lint obj objlink objs objwarn \
294		realinstall tags whereobj
295
296# we don't want ${PROG} to be PHONY
297.PHONY: ${PHONY_NOTMAIN:N${PROG:U}}
298.NOTMAIN: ${PHONY_NOTMAIN:Nall}
299
300.if ${MK_STAGING} != "no"
301.if defined(_SKIP_BUILD) || (!make(all) && !make(clean*) && !make(*clean))
302_SKIP_STAGING?= yes
303.endif
304.if ${_SKIP_STAGING:Uno} == "yes"
305staging stage_libs stage_files stage_as stage_links stage_symlinks:
306.else
307# allow targets like beforeinstall to be leveraged
308DESTDIR= ${STAGE_OBJTOP}
309.export DESTDIR
310
311.if target(beforeinstall)
312.if !empty(_LIBS) || (${MK_STAGING_PROG} != "no" && !defined(INTERNALPROG))
313staging: beforeinstall
314.endif
315.endif
316
317# normally only libs and includes are staged
318.if ${MK_STAGING_PROG} != "no" && !defined(INTERNALPROG)
319STAGE_DIR.prog= ${STAGE_OBJTOP}${BINDIR}
320
321.if !empty(PROG)
322.if defined(PROGNAME)
323STAGE_AS_SETS+= prog
324STAGE_AS_${PROG}= ${PROGNAME}
325stage_as.prog: ${PROG}
326.else
327STAGE_SETS+= prog
328stage_files.prog: ${PROG}
329STAGE_TARGETS+= stage_files
330.endif
331.endif
332.endif
333
334.if !empty(_LIBS) && !defined(INTERNALLIB)
335.if defined(SHLIBDIR) && ${SHLIBDIR} != ${LIBDIR} && ${_LIBS:Uno:M*.so.*} != ""
336STAGE_SETS+= shlib
337STAGE_DIR.shlib= ${STAGE_OBJTOP}${SHLIBDIR}
338STAGE_FILES.shlib+= ${_LIBS:M*.so.*}
339stage_files.shlib: ${_LIBS:M*.so.*}
340.endif
341
342.if defined(SHLIB_LINK) && commands(${SHLIB_LINK:R}.ld)
343STAGE_AS_SETS+= ldscript
344STAGE_AS.ldscript+= ${SHLIB_LINK:R}.ld
345stage_as.ldscript: ${SHLIB_LINK:R}.ld
346STAGE_DIR.ldscript = ${STAGE_LIBDIR}
347STAGE_AS_${SHLIB_LINK:R}.ld:= ${SHLIB_LINK}
348NO_SHLIB_LINKS=
349.endif
350
351.if target(stage_files.shlib)
352stage_libs: ${_LIBS}
353.if defined(DEBUG_FLAGS) && target(${SHLIB_NAME}.symbols)
354stage_files.shlib: ${SHLIB_NAME}.symbols
355.endif
356.else
357stage_libs: ${_LIBS}
358.endif
359.if defined(SHLIB_NAME) && defined(DEBUG_FLAGS) && target(${SHLIB_NAME}.symbols)
360stage_libs: ${SHLIB_NAME}.symbols
361.endif
362
363.endif
364
365.if !empty(INCS) || !empty(INCSGROUPS) && target(buildincludes)
366.if !defined(NO_BEFOREBUILD_INCLUDES)
367stage_includes: buildincludes
368beforebuild: stage_includes
369.endif
370.endif
371
372.for t in stage_libs stage_files stage_as
373.if target($t)
374STAGE_TARGETS+= $t
375.endif
376.endfor
377
378.if !empty(STAGE_AS_SETS)
379STAGE_TARGETS+= stage_as
380.endif
381
382.if !empty(STAGE_TARGETS) || (${MK_STAGING_PROG} != "no" && !defined(INTERNALPROG))
383
384.if !empty(LINKS)
385STAGE_TARGETS+= stage_links
386.if ${MAKE_VERSION} < 20131001
387stage_links.links: ${_LIBS} ${PROG}
388.endif
389STAGE_SETS+= links
390STAGE_LINKS.links= ${LINKS}
391.endif
392
393.if !empty(SYMLINKS)
394STAGE_TARGETS+= stage_symlinks
395STAGE_SETS+= links
396STAGE_SYMLINKS.links= ${SYMLINKS}
397.endif
398
399.endif
400
401.include <meta.stage.mk>
402.endif
403.endif
404
405.if defined(META_TARGETS)
406.for _tgt in ${META_TARGETS}
407.if target(${_tgt})
408${_tgt}: ${META_DEPS}
409.endif
410.endfor
411.endif
412