xref: /freebsd/share/mk/bsd.sys.mk (revision 0ebbda971890c149c5028066fc5ed7ea72228d87) 
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 GCC:   https://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html
10# for clang: https://clang.llvm.org/docs/DiagnosticsReference.html
11
12.include <bsd.compiler.mk>
13
14# the default is gnu99 for now
15CSTD?=		gnu99
16
17.if ${CSTD} == "c89" || ${CSTD} == "c90"
18CFLAGS+=	-std=iso9899:1990
19.elif ${CSTD} == "c94" || ${CSTD} == "c95"
20CFLAGS+=	-std=iso9899:199409
21.elif ${CSTD} == "c99"
22CFLAGS+=	-std=iso9899:1999
23.else # CSTD
24CFLAGS+=	-std=${CSTD}
25.endif # CSTD
26
27.if !empty(CXXSTD)
28CXXFLAGS+=	-std=${CXXSTD}
29.endif
30
31# This gives the Makefile we're evaluating at the top-level a chance to set
32# WARNS.  If it doesn't do so, we may freely pull a DEFAULTWARNS if it's set
33# and use that.  This allows us to default WARNS to 6 for src builds without
34# needing to set the default in various Makefile.inc.
35.if !defined(WARNS) && defined(DEFAULTWARNS)
36WARNS=	${DEFAULTWARNS}
37.endif
38
39# -pedantic is problematic because it also imposes namespace restrictions
40#CFLAGS+=	-pedantic
41.if defined(WARNS)
42.if ${WARNS} >= 1
43CWARNFLAGS+=	-Wsystem-headers
44.if !defined(NO_WERROR) && !defined(NO_WERROR.${COMPILER_TYPE})
45CWARNFLAGS+=	-Werror
46.endif # !NO_WERROR && !NO_WERROR.${COMPILER_TYPE}
47.endif # WARNS >= 1
48.if ${WARNS} >= 2
49CWARNFLAGS+=	-Wall -Wno-format-y2k
50.endif # WARNS >= 2
51.if ${WARNS} >= 3
52CWARNFLAGS+=	-W -Wno-unused-parameter -Wstrict-prototypes\
53		-Wmissing-prototypes -Wpointer-arith
54.endif # WARNS >= 3
55.if ${WARNS} >= 4
56CWARNFLAGS+=	-Wreturn-type -Wcast-qual -Wwrite-strings -Wswitch -Wshadow\
57		-Wunused-parameter
58.if !defined(NO_WCAST_ALIGN) && !defined(NO_WCAST_ALIGN.${COMPILER_TYPE})
59CWARNFLAGS+=	-Wcast-align
60.endif # !NO_WCAST_ALIGN !NO_WCAST_ALIGN.${COMPILER_TYPE}
61.endif # WARNS >= 4
62.if ${WARNS} >= 6
63CWARNFLAGS+=	-Wchar-subscripts -Winline -Wnested-externs -Wredundant-decls\
64		-Wold-style-definition
65.if !defined(NO_WMISSING_VARIABLE_DECLARATIONS)
66CWARNFLAGS.clang+=	-Wmissing-variable-declarations
67.endif
68.if !defined(NO_WTHREAD_SAFETY)
69CWARNFLAGS.clang+=	-Wthread-safety
70.endif
71.endif # WARNS >= 6
72.if ${WARNS} >= 2 && ${WARNS} <= 4
73# XXX Delete -Wuninitialized by default for now -- the compiler doesn't
74# XXX always get it right.
75CWARNFLAGS+=	-Wno-uninitialized
76.endif # WARNS >=2 && WARNS <= 4
77CWARNFLAGS+=	-Wno-pointer-sign
78# Clang has more warnings enabled by default, and when using -Wall, so if WARNS
79# is set to low values, these have to be disabled explicitly.
80.if ${WARNS} <= 6
81CWARNFLAGS.clang+=	-Wno-empty-body -Wno-string-plus-int
82CWARNFLAGS.clang+=	-Wno-unused-const-variable
83.endif # WARNS <= 6
84.if ${WARNS} <= 3
85CWARNFLAGS.clang+=	-Wno-tautological-compare -Wno-unused-value\
86		-Wno-parentheses-equality -Wno-unused-function -Wno-enum-conversion
87CWARNFLAGS.clang+=	-Wno-unused-local-typedef
88CWARNFLAGS.clang+=	-Wno-address-of-packed-member
89.if ${COMPILER_TYPE} == "gcc" && ${COMPILER_VERSION} >= 90100
90CWARNFLAGS.gcc+=	-Wno-address-of-packed-member
91.endif
92.if ${COMPILER_TYPE} == "clang" && ${COMPILER_VERSION} >= 70000 && \
93    ${MACHINE_CPUARCH} == "arm" && !${MACHINE_ARCH:Marmv[67]*}
94CWARNFLAGS.clang+=	-Wno-atomic-alignment
95.endif
96.endif # WARNS <= 3
97.if ${WARNS} <= 2
98CWARNFLAGS.clang+=	-Wno-switch -Wno-switch-enum -Wno-knr-promoted-parameter
99.endif # WARNS <= 2
100.if ${WARNS} <= 1
101CWARNFLAGS.clang+=	-Wno-parentheses
102.endif # WARNS <= 1
103.if defined(NO_WARRAY_BOUNDS)
104CWARNFLAGS.clang+=	-Wno-array-bounds
105.endif # NO_WARRAY_BOUNDS
106.if defined(NO_WMISLEADING_INDENTATION) && \
107    ((${COMPILER_TYPE} == "clang" && ${COMPILER_VERSION} >= 100000) || \
108      ${COMPILER_TYPE} == "gcc")
109CWARNFLAGS+=		-Wno-misleading-indentation
110.endif # NO_WMISLEADING_INDENTATION
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
133# We should clean up warnings produced with these flags.
134# They were originally added as a quick hack to enable gcc5/6.
135# The base system requires at least GCC 6.4, but some ports
136# use this file with older compilers.  Request an exprun
137# before changing these.
138.if ${COMPILER_TYPE} == "gcc"
139# GCC 5.2.0
140.if ${COMPILER_VERSION} >= 50200
141CWARNFLAGS+=	-Wno-error=address			\
142		-Wno-error=array-bounds			\
143		-Wno-error=attributes			\
144		-Wno-error=bool-compare			\
145		-Wno-error=cast-align			\
146		-Wno-error=clobbered			\
147		-Wno-error=deprecated-declarations	\
148		-Wno-error=enum-compare			\
149		-Wno-error=extra			\
150		-Wno-error=inline			\
151		-Wno-error=logical-not-parentheses	\
152		-Wno-error=strict-aliasing		\
153		-Wno-error=uninitialized		\
154		-Wno-error=unused-but-set-variable	\
155		-Wno-error=unused-function		\
156		-Wno-error=unused-value
157.endif
158
159# GCC 6.1.0
160.if ${COMPILER_VERSION} >= 60100
161CWARNFLAGS+=	-Wno-error=empty-body			\
162		-Wno-error=maybe-uninitialized		\
163		-Wno-error=nonnull-compare		\
164		-Wno-error=redundant-decls		\
165		-Wno-error=shift-negative-value		\
166		-Wno-error=tautological-compare		\
167		-Wno-error=unused-const-variable
168.endif
169
170# GCC 7.1.0
171.if ${COMPILER_VERSION} >= 70100
172CWARNFLAGS+=	-Wno-error=bool-operation		\
173		-Wno-error=deprecated			\
174		-Wno-error=expansion-to-defined		\
175		-Wno-error=format-overflow		\
176		-Wno-error=format-truncation		\
177		-Wno-error=implicit-fallthrough		\
178		-Wno-error=int-in-bool-context		\
179		-Wno-error=memset-elt-size		\
180		-Wno-error=noexcept-type		\
181		-Wno-error=nonnull			\
182		-Wno-error=pointer-compare		\
183		-Wno-error=stringop-overflow
184.endif
185
186# GCC 8.1.0
187.if ${COMPILER_VERSION} >= 80100
188CWARNFLAGS+=	-Wno-error=aggressive-loop-optimizations	\
189		-Wno-error=cast-function-type			\
190		-Wno-error=catch-value				\
191		-Wno-error=multistatement-macros		\
192		-Wno-error=restrict				\
193		-Wno-error=sizeof-pointer-memaccess		\
194		-Wno-error=stringop-truncation
195.endif
196
197# GCC's own arm_neon.h triggers various warnings
198.if ${MACHINE_CPUARCH} == "aarch64"
199CWARNFLAGS+=	-Wno-system-headers
200.endif
201.endif	# gcc
202
203# How to handle FreeBSD custom printf format specifiers.
204.if ${COMPILER_TYPE} == "clang"
205FORMAT_EXTENSIONS=	-D__printf__=__freebsd_kprintf__
206.else
207FORMAT_EXTENSIONS=	-fformat-extensions
208.endif
209
210.if defined(IGNORE_PRAGMA)
211CWARNFLAGS+=	-Wno-unknown-pragmas
212.endif # IGNORE_PRAGMA
213
214# This warning is utter nonsense
215CFLAGS+=	-Wno-format-zero-length
216
217.if ${COMPILER_TYPE} == "clang"
218# The headers provided by clang are incompatible with the FreeBSD headers.
219# If the version of clang is not one that has been patched to omit the
220# incompatible headers, we need to compile with -nobuiltininc and add the
221# resource dir to the end of the search paths. This ensures that headers such as
222# immintrin.h are still found but stddef.h, etc. are picked up from FreeBSD.
223#
224# XXX: This is a hack to support complete external installs of clang while
225# we work to synchronize our decleration guards with those in the clang tree.
226.if ${MK_CLANG_BOOTSTRAP:Uno} == "no" && \
227    ${COMPILER_RESOURCE_DIR} != "unknown" && !defined(BOOTSTRAPPING)
228CFLAGS+=-nobuiltininc -idirafter ${COMPILER_RESOURCE_DIR}/include
229.endif
230.endif
231
232CLANG_OPT_SMALL= -mstack-alignment=8 -mllvm -inline-threshold=3\
233		 -mllvm -simplifycfg-dup-ret
234CLANG_OPT_SMALL+= -mllvm -enable-load-pre=false
235CFLAGS.clang+=	 -Qunused-arguments
236# The libc++ headers use c++11 extensions.  These are normally silenced because
237# they are treated as system headers, but we explicitly disable that warning
238# suppression when building the base system to catch bugs in our headers.
239# Eventually we'll want to start building the base system C++ code as C++11,
240# but not yet.
241CXXFLAGS.clang+=	 -Wno-c++11-extensions
242
243.if ${MK_SSP} != "no" && \
244    ${MACHINE_CPUARCH} != "arm" && ${MACHINE_CPUARCH} != "mips"
245# Don't use -Wstack-protector as it breaks world with -Werror.
246SSP_CFLAGS?=	-fstack-protector-strong
247CFLAGS+=	${SSP_CFLAGS}
248.endif # SSP && !ARM && !MIPS
249
250# Additional flags passed in CFLAGS and CXXFLAGS when MK_DEBUG_FILES is
251# enabled.
252DEBUG_FILES_CFLAGS?= -g
253
254# Allow user-specified additional warning flags, plus compiler and file
255# specific flag overrides, unless we've overridden this...
256.if ${MK_WARNS} != "no"
257CFLAGS+=	${CWARNFLAGS:M*} ${CWARNFLAGS.${COMPILER_TYPE}}
258CFLAGS+=	${CWARNFLAGS.${.IMPSRC:T}}
259CXXFLAGS+=	${CXXWARNFLAGS:M*} ${CXXWARNFLAGS.${COMPILER_TYPE}}
260CXXFLAGS+=	${CXXWARNFLAGS.${.IMPSRC:T}}
261.endif
262
263CFLAGS+=	 ${CFLAGS.${COMPILER_TYPE}}
264CXXFLAGS+=	 ${CXXFLAGS.${COMPILER_TYPE}}
265
266AFLAGS+=	${AFLAGS.${.IMPSRC:T}}
267AFLAGS+=	${AFLAGS.${.TARGET:T}}
268ACFLAGS+=	${ACFLAGS.${.IMPSRC:T}}
269ACFLAGS+=	${ACFLAGS.${.TARGET:T}}
270CFLAGS+=	${CFLAGS.${.IMPSRC:T}}
271CXXFLAGS+=	${CXXFLAGS.${.IMPSRC:T}}
272
273LDFLAGS+=	${LDFLAGS.${LINKER_TYPE}}
274
275# Only allow .TARGET when not using PROGS as it has the same syntax
276# per PROG which is ambiguous with this syntax. This is only needed
277# for PROG_VARS vars.
278.if !defined(_RECURSING_PROGS)
279.if ${MK_WARNS} != "no"
280CFLAGS+=	${CWARNFLAGS.${.TARGET:T}}
281.endif
282CFLAGS+=	${CFLAGS.${.TARGET:T}}
283CXXFLAGS+=	${CXXFLAGS.${.TARGET:T}}
284LDFLAGS+=	${LDFLAGS.${.TARGET:T}}
285LDADD+=		${LDADD.${.TARGET:T}}
286LIBADD+=	${LIBADD.${.TARGET:T}}
287.endif
288
289.if defined(SRCTOP)
290# Prevent rebuilding during install to support read-only objdirs.
291.if ${.TARGETS:M*install*} == ${.TARGETS} && empty(.MAKE.MODE:Mmeta)
292CFLAGS+=	ERROR-tried-to-rebuild-during-make-install
293.endif
294.endif
295
296# Please keep this if in sync with kern.mk
297.if ${LD} != "ld" && (${CC:[1]:H} != ${LD:[1]:H} || ${LD:[1]:T} != "ld")
298# Add -fuse-ld=${LD} if $LD is in a different directory or not called "ld".
299# Note: Clang 12+ will prefer --ld-path= over -fuse-ld=.
300.if ${COMPILER_TYPE} == "clang"
301# Note: Clang does not like relative paths in -fuse-ld so we map ld.lld -> lld.
302LDFLAGS+=	-fuse-ld=${LD:[1]:S/^ld.//1W}
303.else
304# GCC does not support an absolute path for -fuse-ld so we just print this
305# warning instead and let the user add the required symlinks.
306.warning LD (${LD}) is not the default linker for ${CC} but -fuse-ld= is not supported
307.endif
308.endif
309
310# Tell bmake not to mistake standard targets for things to be searched for
311# or expect to ever be up-to-date.
312PHONY_NOTMAIN = analyze afterdepend afterinstall all beforedepend beforeinstall \
313		beforelinking build build-tools buildconfig buildfiles \
314		buildincludes check checkdpadd clean cleandepend cleandir \
315		cleanobj configure depend distclean distribute exe \
316		files html includes install installconfig installdirs \
317		installfiles installincludes lint obj objlink objs objwarn \
318		realinstall tags whereobj
319
320# we don't want ${PROG} to be PHONY
321.PHONY: ${PHONY_NOTMAIN:N${PROG:U}}
322.NOTMAIN: ${PHONY_NOTMAIN:Nall}
323
324.if ${MK_STAGING} != "no"
325.if defined(_SKIP_BUILD) || (!make(all) && !make(clean*) && !make(*clean))
326_SKIP_STAGING?= yes
327.endif
328.if ${_SKIP_STAGING:Uno} == "yes"
329staging stage_libs stage_files stage_as stage_links stage_symlinks:
330.else
331# allow targets like beforeinstall to be leveraged
332DESTDIR= ${STAGE_OBJTOP}
333.export DESTDIR
334
335.if target(beforeinstall)
336.if !empty(_LIBS) || (${MK_STAGING_PROG} != "no" && !defined(INTERNALPROG))
337staging: beforeinstall
338.endif
339.endif
340
341# normally only libs and includes are staged
342.if ${MK_STAGING_PROG} != "no" && !defined(INTERNALPROG)
343STAGE_DIR.prog= ${STAGE_OBJTOP}${BINDIR}
344
345.if !empty(PROG)
346.if defined(PROGNAME)
347STAGE_AS_SETS+= prog
348STAGE_AS_${PROG}= ${PROGNAME}
349stage_as.prog: ${PROG}
350.else
351STAGE_SETS+= prog
352stage_files.prog: ${PROG}
353STAGE_TARGETS+= stage_files
354.endif
355.endif
356.endif
357
358.if !empty(_LIBS) && !defined(INTERNALLIB)
359.if defined(SHLIBDIR) && ${SHLIBDIR} != ${LIBDIR} && ${_LIBS:Uno:M*.so.*} != ""
360STAGE_SETS+= shlib
361STAGE_DIR.shlib= ${STAGE_OBJTOP}${SHLIBDIR}
362STAGE_FILES.shlib+= ${_LIBS:M*.so.*}
363stage_files.shlib: ${_LIBS:M*.so.*}
364.endif
365
366.if defined(SHLIB_LINK) && commands(${SHLIB_LINK:R}.ld)
367STAGE_AS_SETS+= ldscript
368STAGE_AS.ldscript+= ${SHLIB_LINK:R}.ld
369stage_as.ldscript: ${SHLIB_LINK:R}.ld
370STAGE_DIR.ldscript = ${STAGE_LIBDIR}
371STAGE_AS_${SHLIB_LINK:R}.ld:= ${SHLIB_LINK}
372NO_SHLIB_LINKS=
373.endif
374
375.if target(stage_files.shlib)
376stage_libs: ${_LIBS}
377.if defined(DEBUG_FLAGS) && target(${SHLIB_NAME}.symbols)
378stage_files.shlib: ${SHLIB_NAME}.symbols
379.endif
380.else
381stage_libs: ${_LIBS}
382.endif
383.if defined(SHLIB_NAME) && defined(DEBUG_FLAGS) && target(${SHLIB_NAME}.symbols)
384stage_libs: ${SHLIB_NAME}.symbols
385.endif
386
387.endif
388
389.if !empty(INCS) || !empty(INCSGROUPS) && target(buildincludes)
390.if !defined(NO_BEFOREBUILD_INCLUDES)
391stage_includes: buildincludes
392beforebuild: stage_includes
393.endif
394.endif
395
396.for t in stage_libs stage_files stage_as
397.if target($t)
398STAGE_TARGETS+= $t
399.endif
400.endfor
401
402.if !empty(STAGE_AS_SETS)
403STAGE_TARGETS+= stage_as
404.endif
405
406.if !empty(STAGE_TARGETS) || (${MK_STAGING_PROG} != "no" && !defined(INTERNALPROG))
407
408.if !empty(LINKS)
409STAGE_TARGETS+= stage_links
410.if ${MAKE_VERSION} < 20131001
411stage_links.links: ${_LIBS} ${PROG}
412.endif
413STAGE_SETS+= links
414STAGE_LINKS.links= ${LINKS}
415.endif
416
417.if !empty(SYMLINKS)
418STAGE_TARGETS+= stage_symlinks
419STAGE_SETS+= links
420STAGE_SYMLINKS.links= ${SYMLINKS}
421.endif
422
423.endif
424
425.include <meta.stage.mk>
426.endif
427.endif
428
429.if defined(META_TARGETS)
430.for _tgt in ${META_TARGETS}
431.if target(${_tgt})
432${_tgt}: ${META_DEPS}
433.endif
434.endfor
435.endif
436