xref: /freebsd/share/mk/bsd.sys.mk (revision 9c474dc51b0b09ff81339caee6772e454dd470e4) 
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
53.if ${COMPILER_TYPE} == "clang" && ${COMPILER_VERSION} < 150000
54CWARNFLAGS+=	-Wstrict-prototypes
55.endif
56CWARNFLAGS+=	-Wmissing-prototypes -Wpointer-arith
57.endif # WARNS >= 3
58.if ${WARNS} >= 4
59CWARNFLAGS+=	-Wreturn-type -Wcast-qual -Wwrite-strings -Wswitch -Wshadow\
60		-Wunused-parameter
61.if !defined(NO_WCAST_ALIGN) && !defined(NO_WCAST_ALIGN.${COMPILER_TYPE})
62CWARNFLAGS+=	-Wcast-align
63.endif # !NO_WCAST_ALIGN !NO_WCAST_ALIGN.${COMPILER_TYPE}
64.endif # WARNS >= 4
65.if ${WARNS} >= 5
66.if ${COMPILER_TYPE} == "clang" && ${COMPILER_VERSION} >= 150000
67CWARNFLAGS+=	-Wstrict-prototypes
68.endif
69.endif # WARNS >= 4
70.if ${WARNS} >= 6
71CWARNFLAGS+=	-Wchar-subscripts -Wnested-externs \
72		-Wold-style-definition
73.if !defined(NO_WMISSING_VARIABLE_DECLARATIONS)
74CWARNFLAGS.clang+=	-Wmissing-variable-declarations
75.endif
76.if !defined(NO_WTHREAD_SAFETY)
77CWARNFLAGS.clang+=	-Wthread-safety
78.endif
79.endif # WARNS >= 6
80.if ${WARNS} >= 2 && ${WARNS} <= 4
81# XXX Delete -Wuninitialized by default for now -- the compiler doesn't
82# XXX always get it right.
83CWARNFLAGS+=	-Wno-uninitialized
84.endif # WARNS >=2 && WARNS <= 4
85CWARNFLAGS+=	-Wno-pointer-sign
86.if !defined(NO_WDATE_TIME)
87CWARNFLAGS+=	-Wdate-time
88.endif # NO_WDATE_TIME
89# Clang has more warnings enabled by default, and when using -Wall, so if WARNS
90# is set to low values, these have to be disabled explicitly.
91.if ${WARNS} <= 6
92CWARNFLAGS.clang+=	-Wno-empty-body -Wno-string-plus-int
93CWARNFLAGS.clang+=	-Wno-unused-const-variable
94.if ${COMPILER_TYPE} == "clang" && ${COMPILER_VERSION} >= 130000
95CWARNFLAGS.clang+=	-Wno-error=unused-but-set-variable
96.endif
97.if ${COMPILER_TYPE} == "clang" && ${COMPILER_VERSION} >= 150000
98CWARNFLAGS.clang+=	-Wno-error=array-parameter
99CWARNFLAGS.clang+=	-Wno-error=deprecated-non-prototype
100CWARNFLAGS.clang+=	-Wno-error=unused-but-set-parameter
101.endif
102.endif # WARNS <= 6
103.if ${WARNS} <= 3
104CWARNFLAGS.clang+=	-Wno-tautological-compare -Wno-unused-value\
105		-Wno-parentheses-equality -Wno-unused-function -Wno-enum-conversion
106CWARNFLAGS.clang+=	-Wno-unused-local-typedef
107CWARNFLAGS.clang+=	-Wno-address-of-packed-member
108.if ${COMPILER_TYPE} == "gcc" && ${COMPILER_VERSION} >= 90100
109CWARNFLAGS.gcc+=	-Wno-address-of-packed-member
110.endif
111.endif # WARNS <= 3
112.if ${WARNS} <= 2
113CWARNFLAGS.clang+=	-Wno-switch -Wno-switch-enum -Wno-knr-promoted-parameter
114.endif # WARNS <= 2
115.if ${WARNS} <= 1
116CWARNFLAGS.clang+=	-Wno-parentheses
117.endif # WARNS <= 1
118.if defined(NO_WARRAY_BOUNDS)
119CWARNFLAGS.clang+=	-Wno-array-bounds
120.endif # NO_WARRAY_BOUNDS
121.if defined(NO_WMISLEADING_INDENTATION) && \
122    ((${COMPILER_TYPE} == "clang" && ${COMPILER_VERSION} >= 100000) || \
123      ${COMPILER_TYPE} == "gcc")
124CWARNFLAGS+=		-Wno-misleading-indentation
125.endif # NO_WMISLEADING_INDENTATION
126.if ${COMPILER_TYPE} == "clang" && ${COMPILER_VERSION} >= 140000
127NO_WBITWISE_INSTEAD_OF_LOGICAL=	-Wno-bitwise-instead-of-logical
128.endif
129.if ${COMPILER_TYPE} == "clang" && ${COMPILER_VERSION} >= 150000
130NO_WSTRICT_PROTOTYPES=	-Wno-strict-prototypes
131NO_WDEPRECATED_NON_PROTOTYPE=-Wno-deprecated-non-prototype
132.endif
133.if ${COMPILER_TYPE} == "gcc" && ${COMPILER_VERSION} >= 100100
134NO_WZERO_LENGTH_BOUNDS=	-Wno-zero-length-bounds
135.endif
136.if ${COMPILER_TYPE} == "gcc" && ${COMPILER_VERSION} >= 110100
137NO_WARRAY_PARAMETER=	-Wno-array-parameter
138.endif
139.if ${COMPILER_TYPE} == "gcc" && ${COMPILER_VERSION} >= 120100
140NO_WUSE_AFTER_FREE=	-Wno-use-after-free
141NO_WDANGLING_POINTER=	-Wno-dangling-pointer
142.endif
143.endif # WARNS
144
145.if defined(FORMAT_AUDIT)
146WFORMAT=	1
147.endif # FORMAT_AUDIT
148.if defined(WFORMAT)
149.if ${WFORMAT} > 0
150#CWARNFLAGS+=	-Wformat-nonliteral -Wformat-security -Wno-format-extra-args
151CWARNFLAGS+=	-Wformat=2 -Wno-format-extra-args
152.if ${WARNS} <= 3
153CWARNFLAGS.clang+=	-Wno-format-nonliteral
154.endif # WARNS <= 3
155.if ${MK_WERROR} != "no" && ${MK_WERROR.${COMPILER_TYPE}:Uyes} != "no"
156CWARNFLAGS+=	-Werror
157.endif # ${MK_WERROR} != "no" && ${MK_WERROR.${COMPILER_TYPE}:Uyes} != "no"
158.endif # WFORMAT > 0
159.endif # WFORMAT
160.if defined(NO_WFORMAT) || defined(NO_WFORMAT.${COMPILER_TYPE})
161CWARNFLAGS+=	-Wno-format
162.endif # NO_WFORMAT || NO_WFORMAT.${COMPILER_TYPE}
163
164# GCC
165# We should clean up warnings produced with these flags.
166# They were originally added as a quick hack to enable gcc5/6.
167# The base system requires at least GCC 6.4, but some ports
168# use this file with older compilers.  Request an exprun
169# before changing these.
170.if ${COMPILER_TYPE} == "gcc"
171# GCC 5.2.0
172.if ${COMPILER_VERSION} >= 50200
173CWARNFLAGS+=	-Wno-error=address			\
174		-Wno-error=array-bounds			\
175		-Wno-error=attributes			\
176		-Wno-error=bool-compare			\
177		-Wno-error=cast-align			\
178		-Wno-error=clobbered			\
179		-Wno-error=deprecated-declarations	\
180		-Wno-error=enum-compare			\
181		-Wno-error=extra			\
182		-Wno-error=logical-not-parentheses	\
183		-Wno-error=strict-aliasing		\
184		-Wno-error=uninitialized		\
185		-Wno-error=unused-but-set-variable	\
186		-Wno-error=unused-function		\
187		-Wno-error=unused-value
188.endif
189
190# GCC 6.1.0
191.if ${COMPILER_VERSION} >= 60100
192CWARNFLAGS+=	-Wno-error=empty-body			\
193		-Wno-error=maybe-uninitialized		\
194		-Wno-error=nonnull-compare		\
195		-Wno-error=shift-negative-value		\
196		-Wno-error=tautological-compare		\
197		-Wno-error=unused-const-variable
198.endif
199
200# GCC 7.1.0
201.if ${COMPILER_VERSION} >= 70100
202CWARNFLAGS+=	-Wno-error=bool-operation		\
203		-Wno-error=deprecated			\
204		-Wno-error=expansion-to-defined		\
205		-Wno-error=format-overflow		\
206		-Wno-error=format-truncation		\
207		-Wno-error=implicit-fallthrough		\
208		-Wno-error=int-in-bool-context		\
209		-Wno-error=memset-elt-size		\
210		-Wno-error=noexcept-type		\
211		-Wno-error=nonnull			\
212		-Wno-error=pointer-compare		\
213		-Wno-error=stringop-overflow
214.endif
215
216# GCC 8.1.0
217.if ${COMPILER_VERSION} >= 80100
218CWARNFLAGS+=	-Wno-error=aggressive-loop-optimizations	\
219		-Wno-error=cast-function-type			\
220		-Wno-error=catch-value				\
221		-Wno-error=multistatement-macros		\
222		-Wno-error=restrict				\
223		-Wno-error=sizeof-pointer-memaccess		\
224		-Wno-error=stringop-truncation
225.endif
226
227# GCC 9.2.0
228.if ${COMPILER_VERSION} >= 90200
229.if ${MACHINE_ARCH} == "i386"
230CWARNFLAGS+=	-Wno-error=overflow
231.endif
232.endif
233
234# GCC 12.1.0
235.if ${COMPILER_VERSION} >= 120100
236# These warnings are raised by headers in libc++ so are disabled
237# globally for all C++
238CXXWARNFLAGS+=	-Wno-literal-suffix 			\
239		-Wno-error=unknown-pragmas
240.endif
241
242# GCC produces false positives for functions that switch on an
243# enum (GCC bug 87950)
244CWARNFLAGS+=	-Wno-return-type
245
246# GCC's own arm_neon.h triggers various warnings
247.if ${MACHINE_CPUARCH} == "aarch64"
248CWARNFLAGS+=	-Wno-system-headers
249.endif
250.endif	# gcc
251
252# How to handle FreeBSD custom printf format specifiers.
253.if ${COMPILER_TYPE} == "clang" || \
254    (${COMPILER_TYPE} == "gcc" && ${COMPILER_VERSION} >= 120100)
255FORMAT_EXTENSIONS=	-D__printf__=__freebsd_kprintf__
256.else
257FORMAT_EXTENSIONS=	-fformat-extensions
258.endif
259
260.if defined(IGNORE_PRAGMA)
261CWARNFLAGS+=	-Wno-unknown-pragmas
262.endif # IGNORE_PRAGMA
263
264# This warning is utter nonsense
265CFLAGS+=	-Wno-format-zero-length
266
267.if ${COMPILER_TYPE} == "clang"
268# The headers provided by clang are incompatible with the FreeBSD headers.
269# If the version of clang is not one that has been patched to omit the
270# incompatible headers, we need to compile with -nobuiltininc and add the
271# resource dir to the end of the search paths. This ensures that headers such as
272# immintrin.h are still found but stddef.h, etc. are picked up from FreeBSD.
273#
274# XXX: This is a hack to support complete external installs of clang while
275# we work to synchronize our decleration guards with those in the clang tree.
276.if ${MK_CLANG_BOOTSTRAP:Uno} == "no" && \
277    ${COMPILER_RESOURCE_DIR} != "unknown" && !defined(BOOTSTRAPPING)
278CFLAGS+=-nobuiltininc -idirafter ${COMPILER_RESOURCE_DIR}/include
279.endif
280.endif
281
282CLANG_OPT_SMALL= -mstack-alignment=8 -mllvm -inline-threshold=3
283.if ${COMPILER_VERSION} < 130000
284CLANG_OPT_SMALL+= -mllvm -simplifycfg-dup-ret
285.endif
286CLANG_OPT_SMALL+= -mllvm -enable-load-pre=false
287CFLAGS.clang+=	 -Qunused-arguments
288# The libc++ headers use c++11 extensions.  These are normally silenced because
289# they are treated as system headers, but we explicitly disable that warning
290# suppression when building the base system to catch bugs in our headers.
291# Eventually we'll want to start building the base system C++ code as C++11,
292# but not yet.
293CXXFLAGS.clang+=	 -Wno-c++11-extensions
294
295.if ${MK_SSP} != "no"
296# Don't use -Wstack-protector as it breaks world with -Werror.
297SSP_CFLAGS?=	-fstack-protector-strong
298CFLAGS+=	${SSP_CFLAGS}
299.endif # SSP
300
301# Additional flags passed in CFLAGS and CXXFLAGS when MK_DEBUG_FILES is
302# enabled.
303DEBUG_FILES_CFLAGS?= -g -gz=zlib
304
305# Allow user-specified additional warning flags, plus compiler and file
306# specific flag overrides, unless we've overridden this...
307.if ${MK_WARNS} != "no"
308CFLAGS+=	${CWARNFLAGS:M*} ${CWARNFLAGS.${COMPILER_TYPE}}
309CFLAGS+=	${CWARNFLAGS.${.IMPSRC:T}}
310CXXFLAGS+=	${CXXWARNFLAGS:M*} ${CXXWARNFLAGS.${COMPILER_TYPE}}
311CXXFLAGS+=	${CXXWARNFLAGS.${.IMPSRC:T}}
312.endif
313
314CFLAGS+=	 ${CFLAGS.${COMPILER_TYPE}}
315CXXFLAGS+=	 ${CXXFLAGS.${COMPILER_TYPE}}
316
317AFLAGS+=	${AFLAGS.${.IMPSRC:T}}
318AFLAGS+=	${AFLAGS.${.TARGET:T}}
319ACFLAGS+=	${ACFLAGS.${.IMPSRC:T}}
320ACFLAGS+=	${ACFLAGS.${.TARGET:T}}
321CFLAGS+=	${CFLAGS.${.IMPSRC:T}}
322CXXFLAGS+=	${CXXFLAGS.${.IMPSRC:T}}
323
324LDFLAGS+=	${LDFLAGS.${LINKER_TYPE}}
325
326# Only allow .TARGET when not using PROGS as it has the same syntax
327# per PROG which is ambiguous with this syntax. This is only needed
328# for PROG_VARS vars.
329#
330# Some directories (currently just clang) also need to disable this since
331# CFLAGS.${COMPILER_TYPE}, CFLAGS.${.IMPSRC:T} and CFLAGS.${.TARGET:T} all live
332# in the same namespace, meaning that, for example, GCC builds of clang pick up
333# CFLAGS.clang via CFLAGS.${.TARGET:T} and thus try to pass Clang-specific
334# flags. Ideally the different sources of CFLAGS would be namespaced to avoid
335# collisions.
336.if !defined(_RECURSING_PROGS) && !defined(NO_TARGET_FLAGS)
337.if ${MK_WARNS} != "no"
338CFLAGS+=	${CWARNFLAGS.${.TARGET:T}}
339.endif
340CFLAGS+=	${CFLAGS.${.TARGET:T}}
341CXXFLAGS+=	${CXXFLAGS.${.TARGET:T}}
342LDFLAGS+=	${LDFLAGS.${.TARGET:T}}
343LDADD+=		${LDADD.${.TARGET:T}}
344LIBADD+=	${LIBADD.${.TARGET:T}}
345.endif
346
347.if defined(SRCTOP)
348# Prevent rebuilding during install to support read-only objdirs.
349.if ${.TARGETS:M*install*} == ${.TARGETS} && empty(.MAKE.MODE:Mmeta)
350CFLAGS+=	ERROR-tried-to-rebuild-during-make-install
351.endif
352.endif
353
354# Please keep this if in sync with kern.mk
355.if ${LD} != "ld" && (${CC:[1]:H} != ${LD:[1]:H} || ${LD:[1]:T} != "ld")
356# Add -fuse-ld=${LD} if $LD is in a different directory or not called "ld".
357.if ${COMPILER_TYPE} == "clang"
358# Note: Clang does not like relative paths for ld so we map ld.lld -> lld.
359.if ${COMPILER_VERSION} >= 120000
360LDFLAGS+=	--ld-path=${LD:[1]:S/^ld.//1W}
361.else
362LDFLAGS+=	-fuse-ld=${LD:[1]:S/^ld.//1W}
363.endif
364.elif ${COMPILER_TYPE} == "gcc"
365# GCC does not support an absolute path for -fuse-ld so we just print this
366# warning instead and let the user add the required symlinks.
367# However, we can avoid this warning if -B is set appropriately (e.g. for
368# CROSS_TOOLCHAIN=...-gcc).
369.if !(${LD:[1]:T} == "ld" && ${CC:tw:M-B${LD:[1]:H}/})
370.warning LD (${LD}) is not the default linker for ${CC} but -fuse-ld= is not supported
371.endif
372.endif
373.endif
374
375# Tell bmake not to mistake standard targets for things to be searched for
376# or expect to ever be up-to-date.
377PHONY_NOTMAIN = analyze afterdepend afterinstall all beforedepend beforeinstall \
378		beforelinking build build-tools buildconfig buildfiles \
379		buildincludes check checkdpadd clean cleandepend cleandir \
380		cleanobj configure depend distclean distribute exe \
381		files html includes install installconfig installdirs \
382		installfiles installincludes lint obj objlink objs objwarn \
383		realinstall tags whereobj
384
385# we don't want ${PROG} to be PHONY
386.PHONY: ${PHONY_NOTMAIN:N${PROG:U}}
387.NOTMAIN: ${PHONY_NOTMAIN:Nall}
388
389.if ${MK_STAGING} != "no"
390.if defined(_SKIP_BUILD) || (!make(all) && !make(clean*) && !make(*clean))
391_SKIP_STAGING?= yes
392.endif
393.if ${_SKIP_STAGING:Uno} == "yes"
394staging stage_libs stage_files stage_as stage_links stage_symlinks:
395.else
396# allow targets like beforeinstall to be leveraged
397DESTDIR= ${STAGE_OBJTOP}
398.export DESTDIR
399
400.if target(beforeinstall)
401.if !empty(_LIBS) || (${MK_STAGING_PROG} != "no" && !defined(INTERNALPROG))
402staging: beforeinstall
403.endif
404.endif
405
406# normally only libs and includes are staged
407.if ${MK_STAGING_PROG} != "no" && !defined(INTERNALPROG)
408STAGE_DIR.prog= ${STAGE_OBJTOP}${BINDIR}
409
410.if !empty(PROG)
411.if defined(PROGNAME)
412STAGE_AS_SETS+= prog
413STAGE_AS_${PROG}= ${PROGNAME}
414stage_as.prog: ${PROG}
415.else
416STAGE_SETS+= prog
417stage_files.prog: ${PROG}
418STAGE_TARGETS+= stage_files
419.endif
420.endif
421.endif
422
423.if !empty(_LIBS) && !defined(INTERNALLIB)
424.if defined(SHLIBDIR) && ${SHLIBDIR} != ${LIBDIR} && ${_LIBS:Uno:M*.so.*} != ""
425STAGE_SETS+= shlib
426STAGE_DIR.shlib= ${STAGE_OBJTOP}${SHLIBDIR}
427STAGE_FILES.shlib+= ${_LIBS:M*.so.*}
428stage_files.shlib: ${_LIBS:M*.so.*}
429.endif
430
431.if defined(SHLIB_LINK) && commands(${SHLIB_LINK:R}.ld)
432STAGE_AS_SETS+= ldscript
433STAGE_AS.ldscript+= ${SHLIB_LINK:R}.ld
434stage_as.ldscript: ${SHLIB_LINK:R}.ld
435STAGE_DIR.ldscript = ${STAGE_LIBDIR}
436STAGE_AS_${SHLIB_LINK:R}.ld:= ${SHLIB_LINK}
437NO_SHLIB_LINKS=
438.endif
439
440.if target(stage_files.shlib)
441stage_libs: ${_LIBS}
442.if defined(DEBUG_FLAGS) && target(${SHLIB_NAME}.symbols)
443stage_files.shlib: ${SHLIB_NAME}.symbols
444.endif
445.else
446stage_libs: ${_LIBS}
447.endif
448.if defined(SHLIB_NAME) && defined(DEBUG_FLAGS) && target(${SHLIB_NAME}.symbols)
449stage_libs: ${SHLIB_NAME}.symbols
450.endif
451
452.endif
453
454.if !empty(INCS) || !empty(INCSGROUPS) && target(buildincludes)
455.if !defined(NO_BEFOREBUILD_INCLUDES)
456stage_includes: buildincludes
457beforebuild: stage_includes
458.endif
459.endif
460
461.for t in stage_libs stage_files stage_as
462.if target($t)
463STAGE_TARGETS+= $t
464.endif
465.endfor
466
467.if !empty(STAGE_AS_SETS)
468STAGE_TARGETS+= stage_as
469.endif
470
471.if !empty(STAGE_TARGETS) || (${MK_STAGING_PROG} != "no" && !defined(INTERNALPROG))
472
473.if !empty(LINKS)
474STAGE_TARGETS+= stage_links
475.if ${MAKE_VERSION} < 20131001
476stage_links.links: ${_LIBS} ${PROG}
477.endif
478STAGE_SETS+= links
479STAGE_LINKS.links= ${LINKS}
480.endif
481
482.if !empty(SYMLINKS)
483STAGE_TARGETS+= stage_symlinks
484STAGE_SETS+= links
485STAGE_SYMLINKS.links= ${SYMLINKS}
486.endif
487
488.endif
489
490.include <meta.stage.mk>
491.endif
492.endif
493
494.if defined(META_TARGETS)
495.for _tgt in ${META_TARGETS}
496.if target(${_tgt})
497${_tgt}: ${META_DEPS}
498.endif
499.endfor
500.endif
501