xref: /freebsd-13.1/share/mk/bsd.sys.mk (revision 284434f7) 
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 -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.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=redundant-decls		\
170		-Wno-error=shift-negative-value		\
171		-Wno-error=tautological-compare		\
172		-Wno-error=unused-const-variable
173.endif
174
175# GCC 7.1.0
176.if ${COMPILER_VERSION} >= 70100
177CWARNFLAGS+=	-Wno-error=bool-operation		\
178		-Wno-error=deprecated			\
179		-Wno-error=expansion-to-defined		\
180		-Wno-error=format-overflow		\
181		-Wno-error=format-truncation		\
182		-Wno-error=implicit-fallthrough		\
183		-Wno-error=int-in-bool-context		\
184		-Wno-error=memset-elt-size		\
185		-Wno-error=noexcept-type		\
186		-Wno-error=nonnull			\
187		-Wno-error=pointer-compare		\
188		-Wno-error=stringop-overflow
189.endif
190
191# GCC 8.1.0
192.if ${COMPILER_VERSION} >= 80100
193CWARNFLAGS+=	-Wno-error=aggressive-loop-optimizations	\
194		-Wno-error=cast-function-type			\
195		-Wno-error=catch-value				\
196		-Wno-error=multistatement-macros		\
197		-Wno-error=restrict				\
198		-Wno-error=sizeof-pointer-memaccess		\
199		-Wno-error=stringop-truncation
200.endif
201
202# GCC's own arm_neon.h triggers various warnings
203.if ${MACHINE_CPUARCH} == "aarch64"
204CWARNFLAGS+=	-Wno-system-headers
205.endif
206.endif	# gcc
207
208# How to handle FreeBSD custom printf format specifiers.
209.if ${COMPILER_TYPE} == "clang"
210FORMAT_EXTENSIONS=	-D__printf__=__freebsd_kprintf__
211.else
212FORMAT_EXTENSIONS=	-fformat-extensions
213.endif
214
215.if defined(IGNORE_PRAGMA)
216CWARNFLAGS+=	-Wno-unknown-pragmas
217.endif # IGNORE_PRAGMA
218
219# This warning is utter nonsense
220CFLAGS+=	-Wno-format-zero-length
221
222.if ${COMPILER_TYPE} == "clang"
223# The headers provided by clang are incompatible with the FreeBSD headers.
224# If the version of clang is not one that has been patched to omit the
225# incompatible headers, we need to compile with -nobuiltininc and add the
226# resource dir to the end of the search paths. This ensures that headers such as
227# immintrin.h are still found but stddef.h, etc. are picked up from FreeBSD.
228#
229# XXX: This is a hack to support complete external installs of clang while
230# we work to synchronize our decleration guards with those in the clang tree.
231.if ${MK_CLANG_BOOTSTRAP:Uno} == "no" && \
232    ${COMPILER_RESOURCE_DIR} != "unknown" && !defined(BOOTSTRAPPING)
233CFLAGS+=-nobuiltininc -idirafter ${COMPILER_RESOURCE_DIR}/include
234.endif
235.endif
236
237CLANG_OPT_SMALL= -mstack-alignment=8 -mllvm -inline-threshold=3
238.if ${COMPILER_VERSION} < 130000
239CLANG_OPT_SMALL+= -mllvm -simplifycfg-dup-ret
240.endif
241CLANG_OPT_SMALL+= -mllvm -enable-load-pre=false
242CFLAGS.clang+=	 -Qunused-arguments
243# The libc++ headers use c++11 extensions.  These are normally silenced because
244# they are treated as system headers, but we explicitly disable that warning
245# suppression when building the base system to catch bugs in our headers.
246# Eventually we'll want to start building the base system C++ code as C++11,
247# but not yet.
248CXXFLAGS.clang+=	 -Wno-c++11-extensions
249
250.if ${MK_SSP} != "no"
251# Don't use -Wstack-protector as it breaks world with -Werror.
252SSP_CFLAGS?=	-fstack-protector-strong
253CFLAGS+=	${SSP_CFLAGS}
254.endif # SSP
255
256# Additional flags passed in CFLAGS and CXXFLAGS when MK_DEBUG_FILES is
257# enabled.
258DEBUG_FILES_CFLAGS?= -g
259
260# Allow user-specified additional warning flags, plus compiler and file
261# specific flag overrides, unless we've overridden this...
262.if ${MK_WARNS} != "no"
263CFLAGS+=	${CWARNFLAGS:M*} ${CWARNFLAGS.${COMPILER_TYPE}}
264CFLAGS+=	${CWARNFLAGS.${.IMPSRC:T}}
265CXXFLAGS+=	${CXXWARNFLAGS:M*} ${CXXWARNFLAGS.${COMPILER_TYPE}}
266CXXFLAGS+=	${CXXWARNFLAGS.${.IMPSRC:T}}
267.endif
268
269CFLAGS+=	 ${CFLAGS.${COMPILER_TYPE}}
270CXXFLAGS+=	 ${CXXFLAGS.${COMPILER_TYPE}}
271
272AFLAGS+=	${AFLAGS.${.IMPSRC:T}}
273AFLAGS+=	${AFLAGS.${.TARGET:T}}
274ACFLAGS+=	${ACFLAGS.${.IMPSRC:T}}
275ACFLAGS+=	${ACFLAGS.${.TARGET:T}}
276CFLAGS+=	${CFLAGS.${.IMPSRC:T}}
277CXXFLAGS+=	${CXXFLAGS.${.IMPSRC:T}}
278
279LDFLAGS+=	${LDFLAGS.${LINKER_TYPE}}
280
281# Only allow .TARGET when not using PROGS as it has the same syntax
282# per PROG which is ambiguous with this syntax. This is only needed
283# for PROG_VARS vars.
284#
285# Some directories (currently just clang) also need to disable this since
286# CFLAGS.${COMPILER_TYPE}, CFLAGS.${.IMPSRC:T} and CFLAGS.${.TARGET:T} all live
287# in the same namespace, meaning that, for example, GCC builds of clang pick up
288# CFLAGS.clang via CFLAGS.${.TARGET:T} and thus try to pass Clang-specific
289# flags. Ideally the different sources of CFLAGS would be namespaced to avoid
290# collisions.
291.if !defined(_RECURSING_PROGS) && !defined(NO_TARGET_FLAGS)
292.if ${MK_WARNS} != "no"
293CFLAGS+=	${CWARNFLAGS.${.TARGET:T}}
294.endif
295CFLAGS+=	${CFLAGS.${.TARGET:T}}
296CXXFLAGS+=	${CXXFLAGS.${.TARGET:T}}
297LDFLAGS+=	${LDFLAGS.${.TARGET:T}}
298LDADD+=		${LDADD.${.TARGET:T}}
299LIBADD+=	${LIBADD.${.TARGET:T}}
300.endif
301
302.if defined(SRCTOP)
303# Prevent rebuilding during install to support read-only objdirs.
304.if ${.TARGETS:M*install*} == ${.TARGETS} && empty(.MAKE.MODE:Mmeta)
305CFLAGS+=	ERROR-tried-to-rebuild-during-make-install
306.endif
307.endif
308
309# Please keep this if in sync with kern.mk
310.if ${LD} != "ld" && (${CC:[1]:H} != ${LD:[1]:H} || ${LD:[1]:T} != "ld")
311# Add -fuse-ld=${LD} if $LD is in a different directory or not called "ld".
312.if ${COMPILER_TYPE} == "clang"
313# Note: Clang does not like relative paths for ld so we map ld.lld -> lld.
314.if ${COMPILER_VERSION} >= 120000
315LDFLAGS+=	--ld-path=${LD:[1]:S/^ld.//1W}
316.else
317LDFLAGS+=	-fuse-ld=${LD:[1]:S/^ld.//1W}
318.endif
319.else
320# GCC does not support an absolute path for -fuse-ld so we just print this
321# warning instead and let the user add the required symlinks.
322# However, we can avoid this warning if -B is set appropriately (e.g. for
323# CROSS_TOOLCHAIN=...-gcc).
324.if !(${LD:[1]:T} == "ld" && ${CC:tw:M-B${LD:[1]:H}/})
325.warning LD (${LD}) is not the default linker for ${CC} but -fuse-ld= is not supported
326.endif
327.endif
328.endif
329
330# Tell bmake not to mistake standard targets for things to be searched for
331# or expect to ever be up-to-date.
332PHONY_NOTMAIN = analyze afterdepend afterinstall all beforedepend beforeinstall \
333		beforelinking build build-tools buildconfig buildfiles \
334		buildincludes check checkdpadd clean cleandepend cleandir \
335		cleanobj configure depend distclean distribute exe \
336		files html includes install installconfig installdirs \
337		installfiles installincludes lint obj objlink objs objwarn \
338		realinstall tags whereobj
339
340# we don't want ${PROG} to be PHONY
341.PHONY: ${PHONY_NOTMAIN:N${PROG:U}}
342.NOTMAIN: ${PHONY_NOTMAIN:Nall}
343
344.if ${MK_STAGING} != "no"
345.if defined(_SKIP_BUILD) || (!make(all) && !make(clean*) && !make(*clean))
346_SKIP_STAGING?= yes
347.endif
348.if ${_SKIP_STAGING:Uno} == "yes"
349staging stage_libs stage_files stage_as stage_links stage_symlinks:
350.else
351# allow targets like beforeinstall to be leveraged
352DESTDIR= ${STAGE_OBJTOP}
353.export DESTDIR
354
355.if target(beforeinstall)
356.if !empty(_LIBS) || (${MK_STAGING_PROG} != "no" && !defined(INTERNALPROG))
357staging: beforeinstall
358.endif
359.endif
360
361# normally only libs and includes are staged
362.if ${MK_STAGING_PROG} != "no" && !defined(INTERNALPROG)
363STAGE_DIR.prog= ${STAGE_OBJTOP}${BINDIR}
364
365.if !empty(PROG)
366.if defined(PROGNAME)
367STAGE_AS_SETS+= prog
368STAGE_AS_${PROG}= ${PROGNAME}
369stage_as.prog: ${PROG}
370.else
371STAGE_SETS+= prog
372stage_files.prog: ${PROG}
373STAGE_TARGETS+= stage_files
374.endif
375.endif
376.endif
377
378.if !empty(_LIBS) && !defined(INTERNALLIB)
379.if defined(SHLIBDIR) && ${SHLIBDIR} != ${LIBDIR} && ${_LIBS:Uno:M*.so.*} != ""
380STAGE_SETS+= shlib
381STAGE_DIR.shlib= ${STAGE_OBJTOP}${SHLIBDIR}
382STAGE_FILES.shlib+= ${_LIBS:M*.so.*}
383stage_files.shlib: ${_LIBS:M*.so.*}
384.endif
385
386.if defined(SHLIB_LINK) && commands(${SHLIB_LINK:R}.ld)
387STAGE_AS_SETS+= ldscript
388STAGE_AS.ldscript+= ${SHLIB_LINK:R}.ld
389stage_as.ldscript: ${SHLIB_LINK:R}.ld
390STAGE_DIR.ldscript = ${STAGE_LIBDIR}
391STAGE_AS_${SHLIB_LINK:R}.ld:= ${SHLIB_LINK}
392NO_SHLIB_LINKS=
393.endif
394
395.if target(stage_files.shlib)
396stage_libs: ${_LIBS}
397.if defined(DEBUG_FLAGS) && target(${SHLIB_NAME}.symbols)
398stage_files.shlib: ${SHLIB_NAME}.symbols
399.endif
400.else
401stage_libs: ${_LIBS}
402.endif
403.if defined(SHLIB_NAME) && defined(DEBUG_FLAGS) && target(${SHLIB_NAME}.symbols)
404stage_libs: ${SHLIB_NAME}.symbols
405.endif
406
407.endif
408
409.if !empty(INCS) || !empty(INCSGROUPS) && target(buildincludes)
410.if !defined(NO_BEFOREBUILD_INCLUDES)
411stage_includes: buildincludes
412beforebuild: stage_includes
413.endif
414.endif
415
416.for t in stage_libs stage_files stage_as
417.if target($t)
418STAGE_TARGETS+= $t
419.endif
420.endfor
421
422.if !empty(STAGE_AS_SETS)
423STAGE_TARGETS+= stage_as
424.endif
425
426.if !empty(STAGE_TARGETS) || (${MK_STAGING_PROG} != "no" && !defined(INTERNALPROG))
427
428.if !empty(LINKS)
429STAGE_TARGETS+= stage_links
430.if ${MAKE_VERSION} < 20131001
431stage_links.links: ${_LIBS} ${PROG}
432.endif
433STAGE_SETS+= links
434STAGE_LINKS.links= ${LINKS}
435.endif
436
437.if !empty(SYMLINKS)
438STAGE_TARGETS+= stage_symlinks
439STAGE_SETS+= links
440STAGE_SYMLINKS.links= ${SYMLINKS}
441.endif
442
443.endif
444
445.include <meta.stage.mk>
446.endif
447.endif
448
449.if defined(META_TARGETS)
450.for _tgt in ${META_TARGETS}
451.if target(${_tgt})
452${_tgt}: ${META_DEPS}
453.endif
454.endfor
455.endif
456