xref: /freebsd/share/mk/bsd.sys.mk (revision 7ef62cebc2f965b0f640263e179276928885e33d) 
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"
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} >= 6
66CWARNFLAGS+=	-Wchar-subscripts -Wnested-externs \
67		-Wold-style-definition
68.if !defined(NO_WMISSING_VARIABLE_DECLARATIONS)
69CWARNFLAGS.clang+=	-Wmissing-variable-declarations
70.endif
71.if !defined(NO_WTHREAD_SAFETY)
72CWARNFLAGS.clang+=	-Wthread-safety
73.endif
74.endif # WARNS >= 6
75.if ${WARNS} >= 2 && ${WARNS} <= 4
76# XXX Delete -Wuninitialized by default for now -- the compiler doesn't
77# XXX always get it right.
78CWARNFLAGS+=	-Wno-uninitialized
79.endif # WARNS >=2 && WARNS <= 4
80CWARNFLAGS+=	-Wno-pointer-sign
81.if !defined(NO_WDATE_TIME)
82CWARNFLAGS+=	-Wdate-time
83.endif # NO_WDATE_TIME
84# Clang has more warnings enabled by default, and when using -Wall, so if WARNS
85# is set to low values, these have to be disabled explicitly.
86.if ${WARNS} <= 6
87CWARNFLAGS.clang+=	-Wno-empty-body -Wno-string-plus-int
88CWARNFLAGS.clang+=	-Wno-unused-const-variable
89.if ${COMPILER_TYPE} == "clang" && ${COMPILER_VERSION} >= 150000
90CWARNFLAGS.clang+=	-Wno-error=unused-but-set-parameter
91.endif
92.endif # WARNS <= 6
93.if ${WARNS} <= 3
94CWARNFLAGS.clang+=	-Wno-tautological-compare -Wno-unused-value\
95		-Wno-parentheses-equality -Wno-unused-function -Wno-enum-conversion
96CWARNFLAGS.clang+=	-Wno-unused-local-typedef
97CWARNFLAGS.clang+=	-Wno-address-of-packed-member
98.if ${COMPILER_TYPE} == "gcc" && ${COMPILER_VERSION} >= 90100
99CWARNFLAGS.gcc+=	-Wno-address-of-packed-member
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 ${WARNS} <= 1
106CWARNFLAGS.clang+=	-Wno-parentheses
107.endif # WARNS <= 1
108.if defined(NO_WARRAY_BOUNDS)
109CWARNFLAGS.clang+=	-Wno-array-bounds
110.endif # NO_WARRAY_BOUNDS
111.if defined(NO_WMISLEADING_INDENTATION) && \
112    ((${COMPILER_TYPE} == "clang" && ${COMPILER_VERSION} >= 100000) || \
113      ${COMPILER_TYPE} == "gcc")
114CWARNFLAGS+=		-Wno-misleading-indentation
115.endif # NO_WMISLEADING_INDENTATION
116.if ${COMPILER_VERSION} >= 130000
117NO_WUNUSED_BUT_SET_VARIABLE=	-Wno-unused-but-set-variable
118.endif
119.if ${COMPILER_TYPE} == "clang" && ${COMPILER_VERSION} >= 140000
120NO_WBITWISE_INSTEAD_OF_LOGICAL=	-Wno-bitwise-instead-of-logical
121.endif
122.if ${COMPILER_TYPE} == "clang" && ${COMPILER_VERSION} >= 150000
123NO_WARRAY_PARAMETER=	-Wno-array-parameter
124NO_WSTRICT_PROTOTYPES=	-Wno-strict-prototypes
125NO_WDEPRECATED_NON_PROTOTYPE=-Wno-deprecated-non-prototype
126.endif
127.if ${COMPILER_TYPE} == "gcc" && ${COMPILER_VERSION} >= 50200
128NO_WUNUSED_BUT_SET_VARIABLE=-Wno-unused-but-set-variable
129.endif
130.if ${COMPILER_TYPE} == "gcc" && ${COMPILER_VERSION} >= 100100
131NO_WZERO_LENGTH_BOUNDS=	-Wno-zero-length-bounds
132.endif
133.if ${COMPILER_TYPE} == "gcc" && ${COMPILER_VERSION} >= 110100
134NO_WARRAY_PARAMETER=	-Wno-array-parameter
135.endif
136.if ${COMPILER_TYPE} == "gcc" && ${COMPILER_VERSION} >= 120100
137NO_WUSE_AFTER_FREE=	-Wno-use-after-free
138NO_WDANGLING_POINTER=	-Wno-dangling-pointer
139.endif
140.endif # WARNS
141
142.if defined(FORMAT_AUDIT)
143WFORMAT=	1
144.endif # FORMAT_AUDIT
145.if defined(WFORMAT)
146.if ${WFORMAT} > 0
147#CWARNFLAGS+=	-Wformat-nonliteral -Wformat-security -Wno-format-extra-args
148CWARNFLAGS+=	-Wformat=2 -Wno-format-extra-args
149.if ${WARNS:U0} <= 3
150CWARNFLAGS.clang+=	-Wno-format-nonliteral
151.endif # WARNS <= 3
152.if ${MK_WERROR} != "no" && ${MK_WERROR.${COMPILER_TYPE}:Uyes} != "no"
153CWARNFLAGS+=	-Werror
154.endif # ${MK_WERROR} != "no" && ${MK_WERROR.${COMPILER_TYPE}:Uyes} != "no"
155.endif # WFORMAT > 0
156.endif # WFORMAT
157.if defined(NO_WFORMAT) || defined(NO_WFORMAT.${COMPILER_TYPE})
158CWARNFLAGS+=	-Wno-format
159.endif # NO_WFORMAT || NO_WFORMAT.${COMPILER_TYPE}
160
161# GCC
162# We should clean up warnings produced with these flags.
163# They were originally added as a quick hack to enable gcc5/6.
164# The base system requires at least GCC 6.4, but some ports
165# use this file with older compilers.  Request an exprun
166# before changing these.
167.if ${COMPILER_TYPE} == "gcc"
168# GCC 5.2.0
169.if ${COMPILER_VERSION} >= 50200
170CWARNFLAGS+=	-Wno-error=address			\
171		-Wno-error=array-bounds			\
172		-Wno-error=attributes			\
173		-Wno-error=bool-compare			\
174		-Wno-error=cast-align			\
175		-Wno-error=clobbered			\
176		-Wno-error=deprecated-declarations	\
177		-Wno-error=enum-compare			\
178		-Wno-error=extra			\
179		-Wno-error=logical-not-parentheses	\
180		-Wno-error=strict-aliasing		\
181		-Wno-error=uninitialized		\
182		-Wno-error=unused-function		\
183		-Wno-error=unused-value
184.endif
185
186# GCC 6.1.0
187.if ${COMPILER_VERSION} >= 60100
188CWARNFLAGS+=	-Wno-error=empty-body			\
189		-Wno-error=maybe-uninitialized		\
190		-Wno-error=nonnull-compare		\
191		-Wno-error=shift-negative-value		\
192		-Wno-error=tautological-compare		\
193		-Wno-error=unused-const-variable
194.endif
195
196# GCC 7.1.0
197.if ${COMPILER_VERSION} >= 70100
198CWARNFLAGS+=	-Wno-error=bool-operation		\
199		-Wno-error=deprecated			\
200		-Wno-error=expansion-to-defined		\
201		-Wno-error=format-overflow		\
202		-Wno-error=format-truncation		\
203		-Wno-error=implicit-fallthrough		\
204		-Wno-error=int-in-bool-context		\
205		-Wno-error=memset-elt-size		\
206		-Wno-error=noexcept-type		\
207		-Wno-error=nonnull			\
208		-Wno-error=pointer-compare		\
209		-Wno-error=stringop-overflow
210.endif
211
212# GCC 8.1.0
213.if ${COMPILER_VERSION} >= 80100
214CWARNFLAGS+=	-Wno-error=aggressive-loop-optimizations	\
215		-Wno-error=cast-function-type			\
216		-Wno-error=catch-value				\
217		-Wno-error=multistatement-macros		\
218		-Wno-error=restrict				\
219		-Wno-error=sizeof-pointer-memaccess		\
220		-Wno-error=stringop-truncation
221.endif
222
223# GCC 9.2.0
224.if ${COMPILER_VERSION} >= 90200
225.if ${MACHINE_ARCH} == "i386"
226CWARNFLAGS+=	-Wno-error=overflow
227.endif
228.endif
229
230# GCC 12.1.0
231.if ${COMPILER_VERSION} >= 120100
232# These warnings are raised by headers in libc++ so are disabled
233# globally for all C++
234CXXWARNFLAGS+=	-Wno-literal-suffix 			\
235		-Wno-error=unknown-pragmas
236.endif
237
238# GCC produces false positives for functions that switch on an
239# enum (GCC bug 87950)
240CWARNFLAGS+=	-Wno-return-type
241
242# GCC's own arm_neon.h triggers various warnings
243.if ${MACHINE_CPUARCH} == "aarch64"
244CWARNFLAGS+=	-Wno-system-headers
245.endif
246.endif	# gcc
247
248# How to handle FreeBSD custom printf format specifiers.
249.if ${COMPILER_TYPE} == "clang" || \
250    (${COMPILER_TYPE} == "gcc" && ${COMPILER_VERSION} >= 120100)
251FORMAT_EXTENSIONS=	-D__printf__=__freebsd_kprintf__
252.else
253FORMAT_EXTENSIONS=	-fformat-extensions
254.endif
255
256.if defined(IGNORE_PRAGMA)
257CWARNFLAGS+=	-Wno-unknown-pragmas
258.endif # IGNORE_PRAGMA
259
260# This warning is utter nonsense
261CFLAGS+=	-Wno-format-zero-length
262
263.if ${COMPILER_TYPE} == "clang"
264# The headers provided by clang are incompatible with the FreeBSD headers.
265# If the version of clang is not one that has been patched to omit the
266# incompatible headers, we need to compile with -nobuiltininc and add the
267# resource dir to the end of the search paths. This ensures that headers such as
268# immintrin.h are still found but stddef.h, etc. are picked up from FreeBSD.
269#
270# XXX: This is a hack to support complete external installs of clang while
271# we work to synchronize our decleration guards with those in the clang tree.
272.if ${MK_CLANG_BOOTSTRAP:Uno} == "no" && \
273    ${COMPILER_RESOURCE_DIR} != "unknown" && !defined(BOOTSTRAPPING)
274CFLAGS+=-nobuiltininc -idirafter ${COMPILER_RESOURCE_DIR}/include
275.endif
276.endif
277
278CLANG_OPT_SMALL= -mstack-alignment=8 -mllvm -inline-threshold=3
279.if ${COMPILER_VERSION} < 130000
280CLANG_OPT_SMALL+= -mllvm -simplifycfg-dup-ret
281.endif
282CLANG_OPT_SMALL+= -mllvm -enable-load-pre=false
283CFLAGS.clang+=	 -Qunused-arguments
284# The libc++ headers use c++11 extensions.  These are normally silenced because
285# they are treated as system headers, but we explicitly disable that warning
286# suppression when building the base system to catch bugs in our headers.
287# Eventually we'll want to start building the base system C++ code as C++11,
288# but not yet.
289CXXFLAGS.clang+=	 -Wno-c++11-extensions
290
291.if ${MK_SSP} != "no"
292# Don't use -Wstack-protector as it breaks world with -Werror.
293SSP_CFLAGS?=	-fstack-protector-strong
294CFLAGS+=	${SSP_CFLAGS}
295.endif # SSP
296
297# Additional flags passed in CFLAGS and CXXFLAGS when MK_DEBUG_FILES is
298# enabled.
299DEBUG_FILES_CFLAGS?= -g -gz=zlib
300
301# Allow user-specified additional warning flags, plus compiler and file
302# specific flag overrides, unless we've overridden this...
303.if ${MK_WARNS} != "no"
304CFLAGS+=	${CWARNFLAGS:M*} ${CWARNFLAGS.${COMPILER_TYPE}}
305CFLAGS+=	${CWARNFLAGS.${.IMPSRC:T}}
306CXXFLAGS+=	${CXXWARNFLAGS:M*} ${CXXWARNFLAGS.${COMPILER_TYPE}}
307CXXFLAGS+=	${CXXWARNFLAGS.${.IMPSRC:T}}
308.endif
309
310CFLAGS+=	 ${CFLAGS.${COMPILER_TYPE}}
311CXXFLAGS+=	 ${CXXFLAGS.${COMPILER_TYPE}}
312
313AFLAGS+=	${AFLAGS.${.IMPSRC:T}}
314AFLAGS+=	${AFLAGS.${.TARGET:T}}
315ACFLAGS+=	${ACFLAGS.${.IMPSRC:T}}
316ACFLAGS+=	${ACFLAGS.${.TARGET:T}}
317CFLAGS+=	${CFLAGS.${.IMPSRC:T}}
318CXXFLAGS+=	${CXXFLAGS.${.IMPSRC:T}}
319
320LDFLAGS+=	${LDFLAGS.${LINKER_TYPE}}
321
322# Only allow .TARGET when not using PROGS as it has the same syntax
323# per PROG which is ambiguous with this syntax. This is only needed
324# for PROG_VARS vars.
325#
326# Some directories (currently just clang) also need to disable this since
327# CFLAGS.${COMPILER_TYPE}, CFLAGS.${.IMPSRC:T} and CFLAGS.${.TARGET:T} all live
328# in the same namespace, meaning that, for example, GCC builds of clang pick up
329# CFLAGS.clang via CFLAGS.${.TARGET:T} and thus try to pass Clang-specific
330# flags. Ideally the different sources of CFLAGS would be namespaced to avoid
331# collisions.
332.if !defined(_RECURSING_PROGS) && !defined(NO_TARGET_FLAGS)
333.if ${MK_WARNS} != "no"
334CFLAGS+=	${CWARNFLAGS.${.TARGET:T}}
335.endif
336CFLAGS+=	${CFLAGS.${.TARGET:T}}
337CXXFLAGS+=	${CXXFLAGS.${.TARGET:T}}
338LDFLAGS+=	${LDFLAGS.${.TARGET:T}}
339LDADD+=		${LDADD.${.TARGET:T}}
340LIBADD+=	${LIBADD.${.TARGET:T}}
341.endif
342
343.if defined(SRCTOP)
344# Prevent rebuilding during install to support read-only objdirs.
345.if ${.TARGETS:M*install*} == ${.TARGETS} && empty(.MAKE.MODE:Mmeta)
346CFLAGS+=	ERROR-tried-to-rebuild-during-make-install
347.endif
348.endif
349
350# Please keep this if in sync with kern.mk
351.if ${LD} != "ld" && (${CC:[1]:H} != ${LD:[1]:H} || ${LD:[1]:T} != "ld")
352# Add -fuse-ld=${LD} if $LD is in a different directory or not called "ld".
353.if ${COMPILER_TYPE} == "clang"
354# Note: Clang does not like relative paths for ld so we map ld.lld -> lld.
355.if ${COMPILER_VERSION} >= 120000
356LDFLAGS+=	--ld-path=${LD:[1]:S/^ld.//1W}
357.else
358LDFLAGS+=	-fuse-ld=${LD:[1]:S/^ld.//1W}
359.endif
360.elif ${COMPILER_TYPE} == "gcc"
361# GCC does not support an absolute path for -fuse-ld so we just print this
362# warning instead and let the user add the required symlinks.
363# However, we can avoid this warning if -B is set appropriately (e.g. for
364# CROSS_TOOLCHAIN=...-gcc).
365.if !(${LD:[1]:T} == "ld" && ${CC:tw:M-B${LD:[1]:H}/})
366.warning LD (${LD}) is not the default linker for ${CC} but -fuse-ld= is not supported
367.endif
368.endif
369.endif
370
371# Tell bmake not to mistake standard targets for things to be searched for
372# or expect to ever be up-to-date.
373PHONY_NOTMAIN = analyze afterdepend afterinstall all beforedepend beforeinstall \
374		beforelinking build build-tools buildconfig buildfiles \
375		buildincludes check checkdpadd clean cleandepend cleandir \
376		cleanobj configure depend distclean distribute exe \
377		files html includes install installconfig installdirs \
378		installfiles installincludes lint obj objlink objs objwarn \
379		realinstall tags whereobj
380
381# we don't want ${PROG} to be PHONY
382.PHONY: ${PHONY_NOTMAIN:N${PROG:U}}
383.NOTMAIN: ${PHONY_NOTMAIN:Nall}
384
385.if ${MK_STAGING} != "no"
386.if defined(_SKIP_BUILD) || (!make(all) && !make(clean*) && !make(*clean))
387_SKIP_STAGING?= yes
388.endif
389.if ${_SKIP_STAGING:Uno} == "yes"
390staging stage_libs stage_files stage_as stage_links stage_symlinks:
391.else
392# allow targets like beforeinstall to be leveraged
393DESTDIR= ${STAGE_OBJTOP}
394.export DESTDIR
395
396.if target(beforeinstall)
397.if !empty(_LIBS) || (${MK_STAGING_PROG} != "no" && !defined(INTERNALPROG))
398staging: beforeinstall
399.endif
400.endif
401
402# normally only libs and includes are staged
403.if ${MK_STAGING_PROG} != "no" && !defined(INTERNALPROG)
404STAGE_DIR.prog= ${STAGE_OBJTOP}${BINDIR}
405
406.if !empty(PROG)
407.if defined(PROGNAME)
408STAGE_AS_SETS+= prog
409STAGE_AS_${PROG}= ${PROGNAME}
410stage_as.prog: ${PROG}
411.else
412STAGE_SETS+= prog
413stage_files.prog: ${PROG}
414STAGE_TARGETS+= stage_files
415.endif
416.endif
417.endif
418
419.if !empty(_LIBS) && !defined(INTERNALLIB)
420.if defined(SHLIBDIR) && ${SHLIBDIR} != ${LIBDIR} && ${_LIBS:Uno:M*.so.*} != ""
421STAGE_SETS+= shlib
422STAGE_DIR.shlib= ${STAGE_OBJTOP}${SHLIBDIR}
423STAGE_FILES.shlib+= ${_LIBS:M*.so.*}
424stage_files.shlib: ${_LIBS:M*.so.*}
425.endif
426
427.if defined(SHLIB_LINK) && commands(${SHLIB_LINK:R}.ld)
428STAGE_AS_SETS+= ldscript
429STAGE_AS.ldscript+= ${SHLIB_LINK:R}.ld
430stage_as.ldscript: ${SHLIB_LINK:R}.ld
431STAGE_DIR.ldscript = ${STAGE_LIBDIR}
432STAGE_AS_${SHLIB_LINK:R}.ld:= ${SHLIB_LINK}
433NO_SHLIB_LINKS=
434.endif
435
436.if defined(STATIC_LDSCRIPT) && target(lib${LIB}.ald)
437STAGE_AS_SETS+= ald
438STAGE_DIR.ald = ${STAGE_LIBDIR}
439STAGE_AS.ald+= lib${LIB}.ald
440STAGE_AS_lib${LIB}.ald = lib${LIB}.a
441stage_as.ald: lib${LIB}.ald
442.endif
443
444.if target(stage_files.shlib)
445stage_libs: ${_LIBS}
446.if defined(DEBUG_FLAGS) && target(${SHLIB_NAME}.symbols)
447stage_files.shlib: ${SHLIB_NAME}.symbols
448.endif
449.else
450stage_libs: ${_LIBS}
451.endif
452.if defined(SHLIB_NAME) && defined(DEBUG_FLAGS) && target(${SHLIB_NAME}.symbols)
453stage_libs: ${SHLIB_NAME}.symbols
454.endif
455
456.endif
457
458.if !empty(INCS) || !empty(INCSGROUPS) && target(buildincludes)
459.if !defined(NO_BEFOREBUILD_INCLUDES)
460stage_includes: buildincludes
461beforebuild: stage_includes
462.endif
463.endif
464
465.for t in stage_libs stage_files stage_as
466.if target($t)
467STAGE_TARGETS+= $t
468.endif
469.endfor
470
471.if !empty(STAGE_AS_SETS)
472STAGE_TARGETS+= stage_as
473.endif
474
475.if !empty(STAGE_TARGETS) || (${MK_STAGING_PROG} != "no" && !defined(INTERNALPROG))
476
477.if !empty(LINKS)
478STAGE_TARGETS+= stage_links
479.if ${MAKE_VERSION} < 20131001
480stage_links.links: ${_LIBS} ${PROG}
481.endif
482STAGE_SETS+= links
483STAGE_LINKS.links= ${LINKS}
484.endif
485
486.if !empty(SYMLINKS)
487STAGE_TARGETS+= stage_symlinks
488STAGE_SETS+= links
489STAGE_SYMLINKS.links= ${SYMLINKS}
490.endif
491
492.endif
493
494.include <meta.stage.mk>
495.endif
496.endif
497
498.if defined(META_TARGETS)
499.for _tgt in ${META_TARGETS}
500.if target(${_tgt})
501${_tgt}: ${META_DEPS}
502.endif
503.endfor
504.endif
505