xref: /freebsd/share/mk/bsd.sys.mk (revision dc318a4ffabcbfa23bb56a33403aad36e6de30af) 
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.endif # WARNS <= 6
84.if ${WARNS} <= 3
85CWARNFLAGS.clang+=	-Wno-tautological-compare -Wno-unused-value\
86		-Wno-parentheses-equality -Wno-unused-function -Wno-enum-conversion
87CWARNFLAGS.clang+=	-Wno-unused-local-typedef
88CWARNFLAGS.clang+=	-Wno-address-of-packed-member
89.if ${COMPILER_TYPE} == "gcc" && ${COMPILER_VERSION} >= 90100
90CWARNFLAGS.gcc+=	-Wno-address-of-packed-member
91.endif
92.if ${COMPILER_TYPE} == "clang" && ${COMPILER_VERSION} >= 70000 && \
93    ${MACHINE_CPUARCH} == "arm" && !${MACHINE_ARCH:Marmv[67]*}
94CWARNFLAGS.clang+=	-Wno-atomic-alignment
95.endif
96.endif # WARNS <= 3
97.if ${WARNS} <= 2
98CWARNFLAGS.clang+=	-Wno-switch -Wno-switch-enum -Wno-knr-promoted-parameter
99.endif # WARNS <= 2
100.if ${WARNS} <= 1
101CWARNFLAGS.clang+=	-Wno-parentheses
102.endif # WARNS <= 1
103.if defined(NO_WARRAY_BOUNDS)
104CWARNFLAGS.clang+=	-Wno-array-bounds
105.endif # NO_WARRAY_BOUNDS
106.if defined(NO_WMISLEADING_INDENTATION) && \
107    ((${COMPILER_TYPE} == "clang" && ${COMPILER_VERSION} >= 100000) || \
108      ${COMPILER_TYPE} == "gcc")
109CWARNFLAGS+=		-Wno-misleading-indentation
110.endif # NO_WMISLEADING_INDENTATION
111.endif # WARNS
112
113.if defined(FORMAT_AUDIT)
114WFORMAT=	1
115.endif # FORMAT_AUDIT
116.if defined(WFORMAT)
117.if ${WFORMAT} > 0
118#CWARNFLAGS+=	-Wformat-nonliteral -Wformat-security -Wno-format-extra-args
119CWARNFLAGS+=	-Wformat=2 -Wno-format-extra-args
120.if ${WARNS} <= 3
121CWARNFLAGS.clang+=	-Wno-format-nonliteral
122.endif # WARNS <= 3
123.if ${MK_WERROR} != "no" && ${MK_WERROR.${COMPILER_TYPE}:Uyes} != "no"
124CWARNFLAGS+=	-Werror
125.endif # ${MK_WERROR} != "no" && ${MK_WERROR.${COMPILER_TYPE}:Uyes} != "no"
126.endif # WFORMAT > 0
127.endif # WFORMAT
128.if defined(NO_WFORMAT) || defined(NO_WFORMAT.${COMPILER_TYPE})
129CWARNFLAGS+=	-Wno-format
130.endif # NO_WFORMAT || NO_WFORMAT.${COMPILER_TYPE}
131
132# GCC
133# We should clean up warnings produced with these flags.
134# They were originally added as a quick hack to enable gcc5/6.
135# The base system requires at least GCC 6.4, but some ports
136# use this file with older compilers.  Request an exprun
137# before changing these.
138.if ${COMPILER_TYPE} == "gcc"
139# GCC 5.2.0
140.if ${COMPILER_VERSION} >= 50200
141CWARNFLAGS+=	-Wno-error=address			\
142		-Wno-error=array-bounds			\
143		-Wno-error=attributes			\
144		-Wno-error=bool-compare			\
145		-Wno-error=cast-align			\
146		-Wno-error=clobbered			\
147		-Wno-error=deprecated-declarations	\
148		-Wno-error=enum-compare			\
149		-Wno-error=extra			\
150		-Wno-error=logical-not-parentheses	\
151		-Wno-error=strict-aliasing		\
152		-Wno-error=uninitialized		\
153		-Wno-error=unused-but-set-variable	\
154		-Wno-error=unused-function		\
155		-Wno-error=unused-value
156.endif
157
158# GCC 6.1.0
159.if ${COMPILER_VERSION} >= 60100
160CWARNFLAGS+=	-Wno-error=empty-body			\
161		-Wno-error=maybe-uninitialized		\
162		-Wno-error=nonnull-compare		\
163		-Wno-error=redundant-decls		\
164		-Wno-error=shift-negative-value		\
165		-Wno-error=tautological-compare		\
166		-Wno-error=unused-const-variable
167.endif
168
169# GCC 7.1.0
170.if ${COMPILER_VERSION} >= 70100
171CWARNFLAGS+=	-Wno-error=bool-operation		\
172		-Wno-error=deprecated			\
173		-Wno-error=expansion-to-defined		\
174		-Wno-error=format-overflow		\
175		-Wno-error=format-truncation		\
176		-Wno-error=implicit-fallthrough		\
177		-Wno-error=int-in-bool-context		\
178		-Wno-error=memset-elt-size		\
179		-Wno-error=noexcept-type		\
180		-Wno-error=nonnull			\
181		-Wno-error=pointer-compare		\
182		-Wno-error=stringop-overflow
183.endif
184
185# GCC 8.1.0
186.if ${COMPILER_VERSION} >= 80100
187CWARNFLAGS+=	-Wno-error=aggressive-loop-optimizations	\
188		-Wno-error=cast-function-type			\
189		-Wno-error=catch-value				\
190		-Wno-error=multistatement-macros		\
191		-Wno-error=restrict				\
192		-Wno-error=sizeof-pointer-memaccess		\
193		-Wno-error=stringop-truncation
194.endif
195
196# GCC's own arm_neon.h triggers various warnings
197.if ${MACHINE_CPUARCH} == "aarch64"
198CWARNFLAGS+=	-Wno-system-headers
199.endif
200.endif	# gcc
201
202# How to handle FreeBSD custom printf format specifiers.
203.if ${COMPILER_TYPE} == "clang"
204FORMAT_EXTENSIONS=	-D__printf__=__freebsd_kprintf__
205.else
206FORMAT_EXTENSIONS=	-fformat-extensions
207.endif
208
209.if defined(IGNORE_PRAGMA)
210CWARNFLAGS+=	-Wno-unknown-pragmas
211.endif # IGNORE_PRAGMA
212
213# This warning is utter nonsense
214CFLAGS+=	-Wno-format-zero-length
215
216.if ${COMPILER_TYPE} == "clang"
217# The headers provided by clang are incompatible with the FreeBSD headers.
218# If the version of clang is not one that has been patched to omit the
219# incompatible headers, we need to compile with -nobuiltininc and add the
220# resource dir to the end of the search paths. This ensures that headers such as
221# immintrin.h are still found but stddef.h, etc. are picked up from FreeBSD.
222#
223# XXX: This is a hack to support complete external installs of clang while
224# we work to synchronize our decleration guards with those in the clang tree.
225.if ${MK_CLANG_BOOTSTRAP:Uno} == "no" && \
226    ${COMPILER_RESOURCE_DIR} != "unknown" && !defined(BOOTSTRAPPING)
227CFLAGS+=-nobuiltininc -idirafter ${COMPILER_RESOURCE_DIR}/include
228.endif
229.endif
230
231CLANG_OPT_SMALL= -mstack-alignment=8 -mllvm -inline-threshold=3\
232		 -mllvm -simplifycfg-dup-ret
233CLANG_OPT_SMALL+= -mllvm -enable-load-pre=false
234CFLAGS.clang+=	 -Qunused-arguments
235# The libc++ headers use c++11 extensions.  These are normally silenced because
236# they are treated as system headers, but we explicitly disable that warning
237# suppression when building the base system to catch bugs in our headers.
238# Eventually we'll want to start building the base system C++ code as C++11,
239# but not yet.
240CXXFLAGS.clang+=	 -Wno-c++11-extensions
241
242.if ${MK_SSP} != "no" && \
243    ${MACHINE_CPUARCH} != "arm" && ${MACHINE_CPUARCH} != "mips"
244# Don't use -Wstack-protector as it breaks world with -Werror.
245SSP_CFLAGS?=	-fstack-protector-strong
246CFLAGS+=	${SSP_CFLAGS}
247.endif # SSP && !ARM && !MIPS
248
249# Additional flags passed in CFLAGS and CXXFLAGS when MK_DEBUG_FILES is
250# enabled.
251DEBUG_FILES_CFLAGS?= -g
252
253# Allow user-specified additional warning flags, plus compiler and file
254# specific flag overrides, unless we've overridden this...
255.if ${MK_WARNS} != "no"
256CFLAGS+=	${CWARNFLAGS:M*} ${CWARNFLAGS.${COMPILER_TYPE}}
257CFLAGS+=	${CWARNFLAGS.${.IMPSRC:T}}
258CXXFLAGS+=	${CXXWARNFLAGS:M*} ${CXXWARNFLAGS.${COMPILER_TYPE}}
259CXXFLAGS+=	${CXXWARNFLAGS.${.IMPSRC:T}}
260.endif
261
262CFLAGS+=	 ${CFLAGS.${COMPILER_TYPE}}
263CXXFLAGS+=	 ${CXXFLAGS.${COMPILER_TYPE}}
264
265AFLAGS+=	${AFLAGS.${.IMPSRC:T}}
266AFLAGS+=	${AFLAGS.${.TARGET:T}}
267ACFLAGS+=	${ACFLAGS.${.IMPSRC:T}}
268ACFLAGS+=	${ACFLAGS.${.TARGET:T}}
269CFLAGS+=	${CFLAGS.${.IMPSRC:T}}
270CXXFLAGS+=	${CXXFLAGS.${.IMPSRC:T}}
271
272LDFLAGS+=	${LDFLAGS.${LINKER_TYPE}}
273
274# Only allow .TARGET when not using PROGS as it has the same syntax
275# per PROG which is ambiguous with this syntax. This is only needed
276# for PROG_VARS vars.
277.if !defined(_RECURSING_PROGS)
278.if ${MK_WARNS} != "no"
279CFLAGS+=	${CWARNFLAGS.${.TARGET:T}}
280.endif
281CFLAGS+=	${CFLAGS.${.TARGET:T}}
282CXXFLAGS+=	${CXXFLAGS.${.TARGET:T}}
283LDFLAGS+=	${LDFLAGS.${.TARGET:T}}
284LDADD+=		${LDADD.${.TARGET:T}}
285LIBADD+=	${LIBADD.${.TARGET:T}}
286.endif
287
288.if defined(SRCTOP)
289# Prevent rebuilding during install to support read-only objdirs.
290.if ${.TARGETS:M*install*} == ${.TARGETS} && empty(.MAKE.MODE:Mmeta)
291CFLAGS+=	ERROR-tried-to-rebuild-during-make-install
292.endif
293.endif
294
295# Please keep this if in sync with kern.mk
296.if ${LD} != "ld" && (${CC:[1]:H} != ${LD:[1]:H} || ${LD:[1]:T} != "ld")
297# Add -fuse-ld=${LD} if $LD is in a different directory or not called "ld".
298.if ${COMPILER_TYPE} == "clang"
299# Note: Clang does not like relative paths for ld so we map ld.lld -> lld.
300.if ${COMPILER_VERSION} >= 120000
301LDFLAGS+=	--ld-path=${LD:[1]:S/^ld.//1W}
302.else
303LDFLAGS+=	-fuse-ld=${LD:[1]:S/^ld.//1W}
304.endif
305.else
306# GCC does not support an absolute path for -fuse-ld so we just print this
307# warning instead and let the user add the required symlinks.
308# However, we can avoid this warning if -B is set appropriately (e.g. for
309# CROSS_TOOLCHAIN=...-gcc).
310.if !(${LD:[1]:T} == "ld" && ${CC:tw:M-B${LD:[1]:H}/})
311.warning LD (${LD}) is not the default linker for ${CC} but -fuse-ld= is not supported
312.endif
313.endif
314.endif
315
316# Tell bmake not to mistake standard targets for things to be searched for
317# or expect to ever be up-to-date.
318PHONY_NOTMAIN = analyze afterdepend afterinstall all beforedepend beforeinstall \
319		beforelinking build build-tools buildconfig buildfiles \
320		buildincludes check checkdpadd clean cleandepend cleandir \
321		cleanobj configure depend distclean distribute exe \
322		files html includes install installconfig installdirs \
323		installfiles installincludes lint obj objlink objs objwarn \
324		realinstall tags whereobj
325
326# we don't want ${PROG} to be PHONY
327.PHONY: ${PHONY_NOTMAIN:N${PROG:U}}
328.NOTMAIN: ${PHONY_NOTMAIN:Nall}
329
330.if ${MK_STAGING} != "no"
331.if defined(_SKIP_BUILD) || (!make(all) && !make(clean*) && !make(*clean))
332_SKIP_STAGING?= yes
333.endif
334.if ${_SKIP_STAGING:Uno} == "yes"
335staging stage_libs stage_files stage_as stage_links stage_symlinks:
336.else
337# allow targets like beforeinstall to be leveraged
338DESTDIR= ${STAGE_OBJTOP}
339.export DESTDIR
340
341.if target(beforeinstall)
342.if !empty(_LIBS) || (${MK_STAGING_PROG} != "no" && !defined(INTERNALPROG))
343staging: beforeinstall
344.endif
345.endif
346
347# normally only libs and includes are staged
348.if ${MK_STAGING_PROG} != "no" && !defined(INTERNALPROG)
349STAGE_DIR.prog= ${STAGE_OBJTOP}${BINDIR}
350
351.if !empty(PROG)
352.if defined(PROGNAME)
353STAGE_AS_SETS+= prog
354STAGE_AS_${PROG}= ${PROGNAME}
355stage_as.prog: ${PROG}
356.else
357STAGE_SETS+= prog
358stage_files.prog: ${PROG}
359STAGE_TARGETS+= stage_files
360.endif
361.endif
362.endif
363
364.if !empty(_LIBS) && !defined(INTERNALLIB)
365.if defined(SHLIBDIR) && ${SHLIBDIR} != ${LIBDIR} && ${_LIBS:Uno:M*.so.*} != ""
366STAGE_SETS+= shlib
367STAGE_DIR.shlib= ${STAGE_OBJTOP}${SHLIBDIR}
368STAGE_FILES.shlib+= ${_LIBS:M*.so.*}
369stage_files.shlib: ${_LIBS:M*.so.*}
370.endif
371
372.if defined(SHLIB_LINK) && commands(${SHLIB_LINK:R}.ld)
373STAGE_AS_SETS+= ldscript
374STAGE_AS.ldscript+= ${SHLIB_LINK:R}.ld
375stage_as.ldscript: ${SHLIB_LINK:R}.ld
376STAGE_DIR.ldscript = ${STAGE_LIBDIR}
377STAGE_AS_${SHLIB_LINK:R}.ld:= ${SHLIB_LINK}
378NO_SHLIB_LINKS=
379.endif
380
381.if target(stage_files.shlib)
382stage_libs: ${_LIBS}
383.if defined(DEBUG_FLAGS) && target(${SHLIB_NAME}.symbols)
384stage_files.shlib: ${SHLIB_NAME}.symbols
385.endif
386.else
387stage_libs: ${_LIBS}
388.endif
389.if defined(SHLIB_NAME) && defined(DEBUG_FLAGS) && target(${SHLIB_NAME}.symbols)
390stage_libs: ${SHLIB_NAME}.symbols
391.endif
392
393.endif
394
395.if !empty(INCS) || !empty(INCSGROUPS) && target(buildincludes)
396.if !defined(NO_BEFOREBUILD_INCLUDES)
397stage_includes: buildincludes
398beforebuild: stage_includes
399.endif
400.endif
401
402.for t in stage_libs stage_files stage_as
403.if target($t)
404STAGE_TARGETS+= $t
405.endif
406.endfor
407
408.if !empty(STAGE_AS_SETS)
409STAGE_TARGETS+= stage_as
410.endif
411
412.if !empty(STAGE_TARGETS) || (${MK_STAGING_PROG} != "no" && !defined(INTERNALPROG))
413
414.if !empty(LINKS)
415STAGE_TARGETS+= stage_links
416.if ${MAKE_VERSION} < 20131001
417stage_links.links: ${_LIBS} ${PROG}
418.endif
419STAGE_SETS+= links
420STAGE_LINKS.links= ${LINKS}
421.endif
422
423.if !empty(SYMLINKS)
424STAGE_TARGETS+= stage_symlinks
425STAGE_SETS+= links
426STAGE_SYMLINKS.links= ${SYMLINKS}
427.endif
428
429.endif
430
431.include <meta.stage.mk>
432.endif
433.endif
434
435.if defined(META_TARGETS)
436.for _tgt in ${META_TARGETS}
437.if target(${_tgt})
438${_tgt}: ${META_DEPS}
439.endif
440.endfor
441.endif
442