xref: /freebsd/share/mk/bsd.sys.mk (revision c9fdd4f3cc18c03683de85318ba8d318f96b58c4) 
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} >= 130000
90CWARNFLAGS.clang+=	-Wno-error=unused-but-set-variable
91.endif
92.if ${COMPILER_TYPE} == "clang" && ${COMPILER_VERSION} >= 150000
93CWARNFLAGS.clang+=	-Wno-error=unused-but-set-parameter
94.endif
95.endif # WARNS <= 6
96.if ${WARNS} <= 3
97CWARNFLAGS.clang+=	-Wno-tautological-compare -Wno-unused-value\
98		-Wno-parentheses-equality -Wno-unused-function -Wno-enum-conversion
99CWARNFLAGS.clang+=	-Wno-unused-local-typedef
100CWARNFLAGS.clang+=	-Wno-address-of-packed-member
101.if ${COMPILER_TYPE} == "gcc" && ${COMPILER_VERSION} >= 90100
102CWARNFLAGS.gcc+=	-Wno-address-of-packed-member
103.endif
104.endif # WARNS <= 3
105.if ${WARNS} <= 2
106CWARNFLAGS.clang+=	-Wno-switch -Wno-switch-enum -Wno-knr-promoted-parameter
107.endif # WARNS <= 2
108.if ${WARNS} <= 1
109CWARNFLAGS.clang+=	-Wno-parentheses
110.endif # WARNS <= 1
111.if defined(NO_WARRAY_BOUNDS)
112CWARNFLAGS.clang+=	-Wno-array-bounds
113.endif # NO_WARRAY_BOUNDS
114.if defined(NO_WMISLEADING_INDENTATION) && \
115    ((${COMPILER_TYPE} == "clang" && ${COMPILER_VERSION} >= 100000) || \
116      ${COMPILER_TYPE} == "gcc")
117CWARNFLAGS+=		-Wno-misleading-indentation
118.endif # NO_WMISLEADING_INDENTATION
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} >= 100100
128NO_WZERO_LENGTH_BOUNDS=	-Wno-zero-length-bounds
129.endif
130.if ${COMPILER_TYPE} == "gcc" && ${COMPILER_VERSION} >= 110100
131NO_WARRAY_PARAMETER=	-Wno-array-parameter
132.endif
133.if ${COMPILER_TYPE} == "gcc" && ${COMPILER_VERSION} >= 120100
134NO_WUSE_AFTER_FREE=	-Wno-use-after-free
135NO_WDANGLING_POINTER=	-Wno-dangling-pointer
136.endif
137.endif # WARNS
138
139.if defined(FORMAT_AUDIT)
140WFORMAT=	1
141.endif # FORMAT_AUDIT
142.if defined(WFORMAT)
143.if ${WFORMAT} > 0
144#CWARNFLAGS+=	-Wformat-nonliteral -Wformat-security -Wno-format-extra-args
145CWARNFLAGS+=	-Wformat=2 -Wno-format-extra-args
146.if ${WARNS:U0} <= 3
147CWARNFLAGS.clang+=	-Wno-format-nonliteral
148.endif # WARNS <= 3
149.if ${MK_WERROR} != "no" && ${MK_WERROR.${COMPILER_TYPE}:Uyes} != "no"
150CWARNFLAGS+=	-Werror
151.endif # ${MK_WERROR} != "no" && ${MK_WERROR.${COMPILER_TYPE}:Uyes} != "no"
152.endif # WFORMAT > 0
153.endif # WFORMAT
154.if defined(NO_WFORMAT) || defined(NO_WFORMAT.${COMPILER_TYPE})
155CWARNFLAGS+=	-Wno-format
156.endif # NO_WFORMAT || NO_WFORMAT.${COMPILER_TYPE}
157
158# GCC
159# We should clean up warnings produced with these flags.
160# They were originally added as a quick hack to enable gcc5/6.
161# The base system requires at least GCC 6.4, but some ports
162# use this file with older compilers.  Request an exprun
163# before changing these.
164.if ${COMPILER_TYPE} == "gcc"
165# GCC 5.2.0
166.if ${COMPILER_VERSION} >= 50200
167CWARNFLAGS+=	-Wno-error=address			\
168		-Wno-error=array-bounds			\
169		-Wno-error=attributes			\
170		-Wno-error=bool-compare			\
171		-Wno-error=cast-align			\
172		-Wno-error=clobbered			\
173		-Wno-error=deprecated-declarations	\
174		-Wno-error=enum-compare			\
175		-Wno-error=extra			\
176		-Wno-error=logical-not-parentheses	\
177		-Wno-error=strict-aliasing		\
178		-Wno-error=uninitialized		\
179		-Wno-error=unused-but-set-variable	\
180		-Wno-error=unused-function		\
181		-Wno-error=unused-value
182.endif
183
184# GCC 6.1.0
185.if ${COMPILER_VERSION} >= 60100
186CWARNFLAGS+=	-Wno-error=empty-body			\
187		-Wno-error=maybe-uninitialized		\
188		-Wno-error=nonnull-compare		\
189		-Wno-error=shift-negative-value		\
190		-Wno-error=tautological-compare		\
191		-Wno-error=unused-const-variable
192.endif
193
194# GCC 7.1.0
195.if ${COMPILER_VERSION} >= 70100
196CWARNFLAGS+=	-Wno-error=bool-operation		\
197		-Wno-error=deprecated			\
198		-Wno-error=expansion-to-defined		\
199		-Wno-error=format-overflow		\
200		-Wno-error=format-truncation		\
201		-Wno-error=implicit-fallthrough		\
202		-Wno-error=int-in-bool-context		\
203		-Wno-error=memset-elt-size		\
204		-Wno-error=noexcept-type		\
205		-Wno-error=nonnull			\
206		-Wno-error=pointer-compare		\
207		-Wno-error=stringop-overflow
208.endif
209
210# GCC 8.1.0
211.if ${COMPILER_VERSION} >= 80100
212CWARNFLAGS+=	-Wno-error=aggressive-loop-optimizations	\
213		-Wno-error=cast-function-type			\
214		-Wno-error=catch-value				\
215		-Wno-error=multistatement-macros		\
216		-Wno-error=restrict				\
217		-Wno-error=sizeof-pointer-memaccess		\
218		-Wno-error=stringop-truncation
219.endif
220
221# GCC 9.2.0
222.if ${COMPILER_VERSION} >= 90200
223.if ${MACHINE_ARCH} == "i386"
224CWARNFLAGS+=	-Wno-error=overflow
225.endif
226.endif
227
228# GCC 12.1.0
229.if ${COMPILER_VERSION} >= 120100
230# These warnings are raised by headers in libc++ so are disabled
231# globally for all C++
232CXXWARNFLAGS+=	-Wno-literal-suffix 			\
233		-Wno-error=unknown-pragmas
234.endif
235
236# GCC produces false positives for functions that switch on an
237# enum (GCC bug 87950)
238CWARNFLAGS+=	-Wno-return-type
239
240# GCC's own arm_neon.h triggers various warnings
241.if ${MACHINE_CPUARCH} == "aarch64"
242CWARNFLAGS+=	-Wno-system-headers
243.endif
244.endif	# gcc
245
246# How to handle FreeBSD custom printf format specifiers.
247.if ${COMPILER_TYPE} == "clang" || \
248    (${COMPILER_TYPE} == "gcc" && ${COMPILER_VERSION} >= 120100)
249FORMAT_EXTENSIONS=	-D__printf__=__freebsd_kprintf__
250.else
251FORMAT_EXTENSIONS=	-fformat-extensions
252.endif
253
254.if defined(IGNORE_PRAGMA)
255CWARNFLAGS+=	-Wno-unknown-pragmas
256.endif # IGNORE_PRAGMA
257
258# This warning is utter nonsense
259CFLAGS+=	-Wno-format-zero-length
260
261.if ${COMPILER_TYPE} == "clang"
262# The headers provided by clang are incompatible with the FreeBSD headers.
263# If the version of clang is not one that has been patched to omit the
264# incompatible headers, we need to compile with -nobuiltininc and add the
265# resource dir to the end of the search paths. This ensures that headers such as
266# immintrin.h are still found but stddef.h, etc. are picked up from FreeBSD.
267#
268# XXX: This is a hack to support complete external installs of clang while
269# we work to synchronize our decleration guards with those in the clang tree.
270.if ${MK_CLANG_BOOTSTRAP:Uno} == "no" && \
271    ${COMPILER_RESOURCE_DIR} != "unknown" && !defined(BOOTSTRAPPING)
272CFLAGS+=-nobuiltininc -idirafter ${COMPILER_RESOURCE_DIR}/include
273.endif
274.endif
275
276CLANG_OPT_SMALL= -mstack-alignment=8 -mllvm -inline-threshold=3
277.if ${COMPILER_VERSION} < 130000
278CLANG_OPT_SMALL+= -mllvm -simplifycfg-dup-ret
279.endif
280CLANG_OPT_SMALL+= -mllvm -enable-load-pre=false
281CFLAGS.clang+=	 -Qunused-arguments
282# The libc++ headers use c++11 extensions.  These are normally silenced because
283# they are treated as system headers, but we explicitly disable that warning
284# suppression when building the base system to catch bugs in our headers.
285# Eventually we'll want to start building the base system C++ code as C++11,
286# but not yet.
287CXXFLAGS.clang+=	 -Wno-c++11-extensions
288
289.if ${MK_SSP} != "no"
290# Don't use -Wstack-protector as it breaks world with -Werror.
291SSP_CFLAGS?=	-fstack-protector-strong
292CFLAGS+=	${SSP_CFLAGS}
293.endif # SSP
294
295# Additional flags passed in CFLAGS and CXXFLAGS when MK_DEBUG_FILES is
296# enabled.
297DEBUG_FILES_CFLAGS?= -g -gz=zlib
298
299# Allow user-specified additional warning flags, plus compiler and file
300# specific flag overrides, unless we've overridden this...
301.if ${MK_WARNS} != "no"
302CFLAGS+=	${CWARNFLAGS:M*} ${CWARNFLAGS.${COMPILER_TYPE}}
303CFLAGS+=	${CWARNFLAGS.${.IMPSRC:T}}
304CXXFLAGS+=	${CXXWARNFLAGS:M*} ${CXXWARNFLAGS.${COMPILER_TYPE}}
305CXXFLAGS+=	${CXXWARNFLAGS.${.IMPSRC:T}}
306.endif
307
308CFLAGS+=	 ${CFLAGS.${COMPILER_TYPE}}
309CXXFLAGS+=	 ${CXXFLAGS.${COMPILER_TYPE}}
310
311AFLAGS+=	${AFLAGS.${.IMPSRC:T}}
312AFLAGS+=	${AFLAGS.${.TARGET:T}}
313ACFLAGS+=	${ACFLAGS.${.IMPSRC:T}}
314ACFLAGS+=	${ACFLAGS.${.TARGET:T}}
315CFLAGS+=	${CFLAGS.${.IMPSRC:T}}
316CXXFLAGS+=	${CXXFLAGS.${.IMPSRC:T}}
317
318LDFLAGS+=	${LDFLAGS.${LINKER_TYPE}}
319
320# Only allow .TARGET when not using PROGS as it has the same syntax
321# per PROG which is ambiguous with this syntax. This is only needed
322# for PROG_VARS vars.
323#
324# Some directories (currently just clang) also need to disable this since
325# CFLAGS.${COMPILER_TYPE}, CFLAGS.${.IMPSRC:T} and CFLAGS.${.TARGET:T} all live
326# in the same namespace, meaning that, for example, GCC builds of clang pick up
327# CFLAGS.clang via CFLAGS.${.TARGET:T} and thus try to pass Clang-specific
328# flags. Ideally the different sources of CFLAGS would be namespaced to avoid
329# collisions.
330.if !defined(_RECURSING_PROGS) && !defined(NO_TARGET_FLAGS)
331.if ${MK_WARNS} != "no"
332CFLAGS+=	${CWARNFLAGS.${.TARGET:T}}
333.endif
334CFLAGS+=	${CFLAGS.${.TARGET:T}}
335CXXFLAGS+=	${CXXFLAGS.${.TARGET:T}}
336LDFLAGS+=	${LDFLAGS.${.TARGET:T}}
337LDADD+=		${LDADD.${.TARGET:T}}
338LIBADD+=	${LIBADD.${.TARGET:T}}
339.endif
340
341.if defined(SRCTOP)
342# Prevent rebuilding during install to support read-only objdirs.
343.if ${.TARGETS:M*install*} == ${.TARGETS} && empty(.MAKE.MODE:Mmeta)
344CFLAGS+=	ERROR-tried-to-rebuild-during-make-install
345.endif
346.endif
347
348# Please keep this if in sync with kern.mk
349.if ${LD} != "ld" && (${CC:[1]:H} != ${LD:[1]:H} || ${LD:[1]:T} != "ld")
350# Add -fuse-ld=${LD} if $LD is in a different directory or not called "ld".
351.if ${COMPILER_TYPE} == "clang"
352# Note: Clang does not like relative paths for ld so we map ld.lld -> lld.
353.if ${COMPILER_VERSION} >= 120000
354LDFLAGS+=	--ld-path=${LD:[1]:S/^ld.//1W}
355.else
356LDFLAGS+=	-fuse-ld=${LD:[1]:S/^ld.//1W}
357.endif
358.elif ${COMPILER_TYPE} == "gcc"
359# GCC does not support an absolute path for -fuse-ld so we just print this
360# warning instead and let the user add the required symlinks.
361# However, we can avoid this warning if -B is set appropriately (e.g. for
362# CROSS_TOOLCHAIN=...-gcc).
363.if !(${LD:[1]:T} == "ld" && ${CC:tw:M-B${LD:[1]:H}/})
364.warning LD (${LD}) is not the default linker for ${CC} but -fuse-ld= is not supported
365.endif
366.endif
367.endif
368
369# Tell bmake not to mistake standard targets for things to be searched for
370# or expect to ever be up-to-date.
371PHONY_NOTMAIN = analyze afterdepend afterinstall all beforedepend beforeinstall \
372		beforelinking build build-tools buildconfig buildfiles \
373		buildincludes check checkdpadd clean cleandepend cleandir \
374		cleanobj configure depend distclean distribute exe \
375		files html includes install installconfig installdirs \
376		installfiles installincludes lint obj objlink objs objwarn \
377		realinstall tags whereobj
378
379# we don't want ${PROG} to be PHONY
380.PHONY: ${PHONY_NOTMAIN:N${PROG:U}}
381.NOTMAIN: ${PHONY_NOTMAIN:Nall}
382
383.if ${MK_STAGING} != "no"
384.if defined(_SKIP_BUILD) || (!make(all) && !make(clean*) && !make(*clean))
385_SKIP_STAGING?= yes
386.endif
387.if ${_SKIP_STAGING:Uno} == "yes"
388staging stage_libs stage_files stage_as stage_links stage_symlinks:
389.else
390# allow targets like beforeinstall to be leveraged
391DESTDIR= ${STAGE_OBJTOP}
392.export DESTDIR
393
394.if target(beforeinstall)
395.if !empty(_LIBS) || (${MK_STAGING_PROG} != "no" && !defined(INTERNALPROG))
396staging: beforeinstall
397.endif
398.endif
399
400# normally only libs and includes are staged
401.if ${MK_STAGING_PROG} != "no" && !defined(INTERNALPROG)
402STAGE_DIR.prog= ${STAGE_OBJTOP}${BINDIR}
403
404.if !empty(PROG)
405.if defined(PROGNAME)
406STAGE_AS_SETS+= prog
407STAGE_AS_${PROG}= ${PROGNAME}
408stage_as.prog: ${PROG}
409.else
410STAGE_SETS+= prog
411stage_files.prog: ${PROG}
412STAGE_TARGETS+= stage_files
413.endif
414.endif
415.endif
416
417.if !empty(_LIBS) && !defined(INTERNALLIB)
418.if defined(SHLIBDIR) && ${SHLIBDIR} != ${LIBDIR} && ${_LIBS:Uno:M*.so.*} != ""
419STAGE_SETS+= shlib
420STAGE_DIR.shlib= ${STAGE_OBJTOP}${SHLIBDIR}
421STAGE_FILES.shlib+= ${_LIBS:M*.so.*}
422stage_files.shlib: ${_LIBS:M*.so.*}
423.endif
424
425.if defined(SHLIB_LINK) && commands(${SHLIB_LINK:R}.ld)
426STAGE_AS_SETS+= ldscript
427STAGE_AS.ldscript+= ${SHLIB_LINK:R}.ld
428stage_as.ldscript: ${SHLIB_LINK:R}.ld
429STAGE_DIR.ldscript = ${STAGE_LIBDIR}
430STAGE_AS_${SHLIB_LINK:R}.ld:= ${SHLIB_LINK}
431NO_SHLIB_LINKS=
432.endif
433
434.if defined(STATIC_LDSCRIPT) && target(lib${LIB}.ald)
435STAGE_AS_SETS+= ald
436STAGE_DIR.ald = ${STAGE_LIBDIR}
437STAGE_AS.ald+= lib${LIB}.ald
438STAGE_AS_lib${LIB}.ald = lib${LIB}.a
439stage_as.ald: lib${LIB}.ald
440.endif
441
442.if target(stage_files.shlib)
443stage_libs: ${_LIBS}
444.if defined(DEBUG_FLAGS) && target(${SHLIB_NAME}.symbols)
445stage_files.shlib: ${SHLIB_NAME}.symbols
446.endif
447.else
448stage_libs: ${_LIBS}
449.endif
450.if defined(SHLIB_NAME) && defined(DEBUG_FLAGS) && target(${SHLIB_NAME}.symbols)
451stage_libs: ${SHLIB_NAME}.symbols
452.endif
453
454.endif
455
456.if !empty(INCS) || !empty(INCSGROUPS) && target(buildincludes)
457.if !defined(NO_BEFOREBUILD_INCLUDES)
458stage_includes: buildincludes
459beforebuild: stage_includes
460.endif
461.endif
462
463.for t in stage_libs stage_files stage_as
464.if target($t)
465STAGE_TARGETS+= $t
466.endif
467.endfor
468
469.if !empty(STAGE_AS_SETS)
470STAGE_TARGETS+= stage_as
471.endif
472
473.if !empty(STAGE_TARGETS) || (${MK_STAGING_PROG} != "no" && !defined(INTERNALPROG))
474
475.if !empty(LINKS)
476STAGE_TARGETS+= stage_links
477.if ${MAKE_VERSION} < 20131001
478stage_links.links: ${_LIBS} ${PROG}
479.endif
480STAGE_SETS+= links
481STAGE_LINKS.links= ${LINKS}
482.endif
483
484.if !empty(SYMLINKS)
485STAGE_TARGETS+= stage_symlinks
486STAGE_SETS+= links
487STAGE_SYMLINKS.links= ${SYMLINKS}
488.endif
489
490.endif
491
492.include <meta.stage.mk>
493.endif
494.endif
495
496.if defined(META_TARGETS)
497.for _tgt in ${META_TARGETS}
498.if target(${_tgt})
499${_tgt}: ${META_DEPS}
500.endif
501.endfor
502.endif
503