xref: /freebsd/share/mk/bsd.sys.mk (revision 643ac419fafba89f5adda0e0ea75b538727453fb) 
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 ${MK_WERROR} != "no" && ${MK_WERROR.${COMPILER_TYPE}:Uyes} != "no"
45CWARNFLAGS+=	-Werror
46.endif # ${MK_WERROR} != "no" && ${MK_WERROR.${COMPILER_TYPE}:Uyes} != "no"
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 -Wnested-externs \
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.if ${COMPILER_TYPE} == "clang" && ${COMPILER_VERSION} >= 130000
84CWARNFLAGS.clang+=	-Wno-error=unused-but-set-variable
85.endif
86.endif # WARNS <= 6
87.if ${WARNS} <= 3
88CWARNFLAGS.clang+=	-Wno-tautological-compare -Wno-unused-value\
89		-Wno-parentheses-equality -Wno-unused-function -Wno-enum-conversion
90CWARNFLAGS.clang+=	-Wno-unused-local-typedef
91CWARNFLAGS.clang+=	-Wno-address-of-packed-member
92.if ${COMPILER_TYPE} == "gcc" && ${COMPILER_VERSION} >= 90100
93CWARNFLAGS.gcc+=	-Wno-address-of-packed-member
94.endif
95.if ${COMPILER_TYPE} == "clang" && ${COMPILER_VERSION} >= 70000 && \
96    ${MACHINE_CPUARCH} == "arm" && !${MACHINE_ARCH:Marmv[67]*}
97CWARNFLAGS.clang+=	-Wno-atomic-alignment
98.endif
99.endif # WARNS <= 3
100.if ${WARNS} <= 2
101CWARNFLAGS.clang+=	-Wno-switch -Wno-switch-enum -Wno-knr-promoted-parameter
102.endif # WARNS <= 2
103.if ${WARNS} <= 1
104CWARNFLAGS.clang+=	-Wno-parentheses
105.endif # WARNS <= 1
106.if defined(NO_WARRAY_BOUNDS)
107CWARNFLAGS.clang+=	-Wno-array-bounds
108.endif # NO_WARRAY_BOUNDS
109.if defined(NO_WMISLEADING_INDENTATION) && \
110    ((${COMPILER_TYPE} == "clang" && ${COMPILER_VERSION} >= 100000) || \
111      ${COMPILER_TYPE} == "gcc")
112CWARNFLAGS+=		-Wno-misleading-indentation
113.endif # NO_WMISLEADING_INDENTATION
114.if ${COMPILER_TYPE} == "clang" && ${COMPILER_VERSION} >= 140000
115NO_WBITWISE_INSTEAD_OF_LOGICAL=	-Wno-bitwise-instead-of-logical
116.endif
117.endif # WARNS
118
119.if defined(FORMAT_AUDIT)
120WFORMAT=	1
121.endif # FORMAT_AUDIT
122.if defined(WFORMAT)
123.if ${WFORMAT} > 0
124#CWARNFLAGS+=	-Wformat-nonliteral -Wformat-security -Wno-format-extra-args
125CWARNFLAGS+=	-Wformat=2 -Wno-format-extra-args
126.if ${WARNS} <= 3
127CWARNFLAGS.clang+=	-Wno-format-nonliteral
128.endif # WARNS <= 3
129.if ${MK_WERROR} != "no" && ${MK_WERROR.${COMPILER_TYPE}:Uyes} != "no"
130CWARNFLAGS+=	-Werror
131.endif # ${MK_WERROR} != "no" && ${MK_WERROR.${COMPILER_TYPE}:Uyes} != "no"
132.endif # WFORMAT > 0
133.endif # WFORMAT
134.if defined(NO_WFORMAT) || defined(NO_WFORMAT.${COMPILER_TYPE})
135CWARNFLAGS+=	-Wno-format
136.endif # NO_WFORMAT || NO_WFORMAT.${COMPILER_TYPE}
137
138# GCC
139# We should clean up warnings produced with these flags.
140# They were originally added as a quick hack to enable gcc5/6.
141# The base system requires at least GCC 6.4, but some ports
142# use this file with older compilers.  Request an exprun
143# before changing these.
144.if ${COMPILER_TYPE} == "gcc"
145# GCC 5.2.0
146.if ${COMPILER_VERSION} >= 50200
147CWARNFLAGS+=	-Wno-error=address			\
148		-Wno-error=array-bounds			\
149		-Wno-error=attributes			\
150		-Wno-error=bool-compare			\
151		-Wno-error=cast-align			\
152		-Wno-error=clobbered			\
153		-Wno-error=deprecated-declarations	\
154		-Wno-error=enum-compare			\
155		-Wno-error=extra			\
156		-Wno-error=logical-not-parentheses	\
157		-Wno-error=strict-aliasing		\
158		-Wno-error=uninitialized		\
159		-Wno-error=unused-but-set-variable	\
160		-Wno-error=unused-function		\
161		-Wno-error=unused-value
162.endif
163
164# GCC 6.1.0
165.if ${COMPILER_VERSION} >= 60100
166CWARNFLAGS+=	-Wno-error=empty-body			\
167		-Wno-error=maybe-uninitialized		\
168		-Wno-error=nonnull-compare		\
169		-Wno-error=shift-negative-value		\
170		-Wno-error=tautological-compare		\
171		-Wno-error=unused-const-variable
172.endif
173
174# GCC 7.1.0
175.if ${COMPILER_VERSION} >= 70100
176CWARNFLAGS+=	-Wno-error=bool-operation		\
177		-Wno-error=deprecated			\
178		-Wno-error=expansion-to-defined		\
179		-Wno-error=format-overflow		\
180		-Wno-error=format-truncation		\
181		-Wno-error=implicit-fallthrough		\
182		-Wno-error=int-in-bool-context		\
183		-Wno-error=memset-elt-size		\
184		-Wno-error=noexcept-type		\
185		-Wno-error=nonnull			\
186		-Wno-error=pointer-compare		\
187		-Wno-error=stringop-overflow
188.endif
189
190# GCC 8.1.0
191.if ${COMPILER_VERSION} >= 80100
192CWARNFLAGS+=	-Wno-error=aggressive-loop-optimizations	\
193		-Wno-error=cast-function-type			\
194		-Wno-error=catch-value				\
195		-Wno-error=multistatement-macros		\
196		-Wno-error=restrict				\
197		-Wno-error=sizeof-pointer-memaccess		\
198		-Wno-error=stringop-truncation
199.endif
200
201# GCC 9.2.0
202.if ${COMPILER_VERSION} >= 90200
203.if ${MACHINE_ARCH} == "i386"
204CWARNFLAGS+=	-Wno-error=overflow
205.endif
206.endif
207
208# GCC produces false positives for functions that switch on an
209# enum (GCC bug 87950)
210CWARNFLAGS+=	-Wno-return-type
211
212# GCC's own arm_neon.h triggers various warnings
213.if ${MACHINE_CPUARCH} == "aarch64"
214CWARNFLAGS+=	-Wno-system-headers
215.endif
216.endif	# gcc
217
218# How to handle FreeBSD custom printf format specifiers.
219.if ${COMPILER_TYPE} == "clang"
220FORMAT_EXTENSIONS=	-D__printf__=__freebsd_kprintf__
221.else
222FORMAT_EXTENSIONS=	-fformat-extensions
223.endif
224
225.if defined(IGNORE_PRAGMA)
226CWARNFLAGS+=	-Wno-unknown-pragmas
227.endif # IGNORE_PRAGMA
228
229# This warning is utter nonsense
230CFLAGS+=	-Wno-format-zero-length
231
232.if ${COMPILER_TYPE} == "clang"
233# The headers provided by clang are incompatible with the FreeBSD headers.
234# If the version of clang is not one that has been patched to omit the
235# incompatible headers, we need to compile with -nobuiltininc and add the
236# resource dir to the end of the search paths. This ensures that headers such as
237# immintrin.h are still found but stddef.h, etc. are picked up from FreeBSD.
238#
239# XXX: This is a hack to support complete external installs of clang while
240# we work to synchronize our decleration guards with those in the clang tree.
241.if ${MK_CLANG_BOOTSTRAP:Uno} == "no" && \
242    ${COMPILER_RESOURCE_DIR} != "unknown" && !defined(BOOTSTRAPPING)
243CFLAGS+=-nobuiltininc -idirafter ${COMPILER_RESOURCE_DIR}/include
244.endif
245.endif
246
247CLANG_OPT_SMALL= -mstack-alignment=8 -mllvm -inline-threshold=3
248.if ${COMPILER_VERSION} < 130000
249CLANG_OPT_SMALL+= -mllvm -simplifycfg-dup-ret
250.endif
251CLANG_OPT_SMALL+= -mllvm -enable-load-pre=false
252CFLAGS.clang+=	 -Qunused-arguments
253# The libc++ headers use c++11 extensions.  These are normally silenced because
254# they are treated as system headers, but we explicitly disable that warning
255# suppression when building the base system to catch bugs in our headers.
256# Eventually we'll want to start building the base system C++ code as C++11,
257# but not yet.
258CXXFLAGS.clang+=	 -Wno-c++11-extensions
259
260.if ${MK_SSP} != "no"
261# Don't use -Wstack-protector as it breaks world with -Werror.
262SSP_CFLAGS?=	-fstack-protector-strong
263CFLAGS+=	${SSP_CFLAGS}
264.endif # SSP
265
266# Additional flags passed in CFLAGS and CXXFLAGS when MK_DEBUG_FILES is
267# enabled.
268DEBUG_FILES_CFLAGS?= -g -gz=zlib
269
270# Allow user-specified additional warning flags, plus compiler and file
271# specific flag overrides, unless we've overridden this...
272.if ${MK_WARNS} != "no"
273CFLAGS+=	${CWARNFLAGS:M*} ${CWARNFLAGS.${COMPILER_TYPE}}
274CFLAGS+=	${CWARNFLAGS.${.IMPSRC:T}}
275CXXFLAGS+=	${CXXWARNFLAGS:M*} ${CXXWARNFLAGS.${COMPILER_TYPE}}
276CXXFLAGS+=	${CXXWARNFLAGS.${.IMPSRC:T}}
277.endif
278
279CFLAGS+=	 ${CFLAGS.${COMPILER_TYPE}}
280CXXFLAGS+=	 ${CXXFLAGS.${COMPILER_TYPE}}
281
282AFLAGS+=	${AFLAGS.${.IMPSRC:T}}
283AFLAGS+=	${AFLAGS.${.TARGET:T}}
284ACFLAGS+=	${ACFLAGS.${.IMPSRC:T}}
285ACFLAGS+=	${ACFLAGS.${.TARGET:T}}
286CFLAGS+=	${CFLAGS.${.IMPSRC:T}}
287CXXFLAGS+=	${CXXFLAGS.${.IMPSRC:T}}
288
289LDFLAGS+=	${LDFLAGS.${LINKER_TYPE}}
290
291# Only allow .TARGET when not using PROGS as it has the same syntax
292# per PROG which is ambiguous with this syntax. This is only needed
293# for PROG_VARS vars.
294#
295# Some directories (currently just clang) also need to disable this since
296# CFLAGS.${COMPILER_TYPE}, CFLAGS.${.IMPSRC:T} and CFLAGS.${.TARGET:T} all live
297# in the same namespace, meaning that, for example, GCC builds of clang pick up
298# CFLAGS.clang via CFLAGS.${.TARGET:T} and thus try to pass Clang-specific
299# flags. Ideally the different sources of CFLAGS would be namespaced to avoid
300# collisions.
301.if !defined(_RECURSING_PROGS) && !defined(NO_TARGET_FLAGS)
302.if ${MK_WARNS} != "no"
303CFLAGS+=	${CWARNFLAGS.${.TARGET:T}}
304.endif
305CFLAGS+=	${CFLAGS.${.TARGET:T}}
306CXXFLAGS+=	${CXXFLAGS.${.TARGET:T}}
307LDFLAGS+=	${LDFLAGS.${.TARGET:T}}
308LDADD+=		${LDADD.${.TARGET:T}}
309LIBADD+=	${LIBADD.${.TARGET:T}}
310.endif
311
312.if defined(SRCTOP)
313# Prevent rebuilding during install to support read-only objdirs.
314.if ${.TARGETS:M*install*} == ${.TARGETS} && empty(.MAKE.MODE:Mmeta)
315CFLAGS+=	ERROR-tried-to-rebuild-during-make-install
316.endif
317.endif
318
319# Please keep this if in sync with kern.mk
320.if ${LD} != "ld" && (${CC:[1]:H} != ${LD:[1]:H} || ${LD:[1]:T} != "ld")
321# Add -fuse-ld=${LD} if $LD is in a different directory or not called "ld".
322.if ${COMPILER_TYPE} == "clang"
323# Note: Clang does not like relative paths for ld so we map ld.lld -> lld.
324.if ${COMPILER_VERSION} >= 120000
325LDFLAGS+=	--ld-path=${LD:[1]:S/^ld.//1W}
326.else
327LDFLAGS+=	-fuse-ld=${LD:[1]:S/^ld.//1W}
328.endif
329.elif ${COMPILER_TYPE} == "gcc"
330# GCC does not support an absolute path for -fuse-ld so we just print this
331# warning instead and let the user add the required symlinks.
332# However, we can avoid this warning if -B is set appropriately (e.g. for
333# CROSS_TOOLCHAIN=...-gcc).
334.if !(${LD:[1]:T} == "ld" && ${CC:tw:M-B${LD:[1]:H}/})
335.warning LD (${LD}) is not the default linker for ${CC} but -fuse-ld= is not supported
336.endif
337.endif
338.endif
339
340# Tell bmake not to mistake standard targets for things to be searched for
341# or expect to ever be up-to-date.
342PHONY_NOTMAIN = analyze afterdepend afterinstall all beforedepend beforeinstall \
343		beforelinking build build-tools buildconfig buildfiles \
344		buildincludes check checkdpadd clean cleandepend cleandir \
345		cleanobj configure depend distclean distribute exe \
346		files html includes install installconfig installdirs \
347		installfiles installincludes lint obj objlink objs objwarn \
348		realinstall tags whereobj
349
350# we don't want ${PROG} to be PHONY
351.PHONY: ${PHONY_NOTMAIN:N${PROG:U}}
352.NOTMAIN: ${PHONY_NOTMAIN:Nall}
353
354.if ${MK_STAGING} != "no"
355.if defined(_SKIP_BUILD) || (!make(all) && !make(clean*) && !make(*clean))
356_SKIP_STAGING?= yes
357.endif
358.if ${_SKIP_STAGING:Uno} == "yes"
359staging stage_libs stage_files stage_as stage_links stage_symlinks:
360.else
361# allow targets like beforeinstall to be leveraged
362DESTDIR= ${STAGE_OBJTOP}
363.export DESTDIR
364
365.if target(beforeinstall)
366.if !empty(_LIBS) || (${MK_STAGING_PROG} != "no" && !defined(INTERNALPROG))
367staging: beforeinstall
368.endif
369.endif
370
371# normally only libs and includes are staged
372.if ${MK_STAGING_PROG} != "no" && !defined(INTERNALPROG)
373STAGE_DIR.prog= ${STAGE_OBJTOP}${BINDIR}
374
375.if !empty(PROG)
376.if defined(PROGNAME)
377STAGE_AS_SETS+= prog
378STAGE_AS_${PROG}= ${PROGNAME}
379stage_as.prog: ${PROG}
380.else
381STAGE_SETS+= prog
382stage_files.prog: ${PROG}
383STAGE_TARGETS+= stage_files
384.endif
385.endif
386.endif
387
388.if !empty(_LIBS) && !defined(INTERNALLIB)
389.if defined(SHLIBDIR) && ${SHLIBDIR} != ${LIBDIR} && ${_LIBS:Uno:M*.so.*} != ""
390STAGE_SETS+= shlib
391STAGE_DIR.shlib= ${STAGE_OBJTOP}${SHLIBDIR}
392STAGE_FILES.shlib+= ${_LIBS:M*.so.*}
393stage_files.shlib: ${_LIBS:M*.so.*}
394.endif
395
396.if defined(SHLIB_LINK) && commands(${SHLIB_LINK:R}.ld)
397STAGE_AS_SETS+= ldscript
398STAGE_AS.ldscript+= ${SHLIB_LINK:R}.ld
399stage_as.ldscript: ${SHLIB_LINK:R}.ld
400STAGE_DIR.ldscript = ${STAGE_LIBDIR}
401STAGE_AS_${SHLIB_LINK:R}.ld:= ${SHLIB_LINK}
402NO_SHLIB_LINKS=
403.endif
404
405.if target(stage_files.shlib)
406stage_libs: ${_LIBS}
407.if defined(DEBUG_FLAGS) && target(${SHLIB_NAME}.symbols)
408stage_files.shlib: ${SHLIB_NAME}.symbols
409.endif
410.else
411stage_libs: ${_LIBS}
412.endif
413.if defined(SHLIB_NAME) && defined(DEBUG_FLAGS) && target(${SHLIB_NAME}.symbols)
414stage_libs: ${SHLIB_NAME}.symbols
415.endif
416
417.endif
418
419.if !empty(INCS) || !empty(INCSGROUPS) && target(buildincludes)
420.if !defined(NO_BEFOREBUILD_INCLUDES)
421stage_includes: buildincludes
422beforebuild: stage_includes
423.endif
424.endif
425
426.for t in stage_libs stage_files stage_as
427.if target($t)
428STAGE_TARGETS+= $t
429.endif
430.endfor
431
432.if !empty(STAGE_AS_SETS)
433STAGE_TARGETS+= stage_as
434.endif
435
436.if !empty(STAGE_TARGETS) || (${MK_STAGING_PROG} != "no" && !defined(INTERNALPROG))
437
438.if !empty(LINKS)
439STAGE_TARGETS+= stage_links
440.if ${MAKE_VERSION} < 20131001
441stage_links.links: ${_LIBS} ${PROG}
442.endif
443STAGE_SETS+= links
444STAGE_LINKS.links= ${LINKS}
445.endif
446
447.if !empty(SYMLINKS)
448STAGE_TARGETS+= stage_symlinks
449STAGE_SETS+= links
450STAGE_SYMLINKS.links= ${SYMLINKS}
451.endif
452
453.endif
454
455.include <meta.stage.mk>
456.endif
457.endif
458
459.if defined(META_TARGETS)
460.for _tgt in ${META_TARGETS}
461.if target(${_tgt})
462${_tgt}: ${META_DEPS}
463.endif
464.endfor
465.endif
466