xref: /freebsd/share/mk/bsd.sys.mk (revision c1d255d3) 
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.if ${COMPILER_VERSION} < 130000
233CLANG_OPT_SMALL+= -mllvm -simplifycfg-dup-ret
234.endif
235CLANG_OPT_SMALL+= -mllvm -enable-load-pre=false
236CFLAGS.clang+=	 -Qunused-arguments
237# The libc++ headers use c++11 extensions.  These are normally silenced because
238# they are treated as system headers, but we explicitly disable that warning
239# suppression when building the base system to catch bugs in our headers.
240# Eventually we'll want to start building the base system C++ code as C++11,
241# but not yet.
242CXXFLAGS.clang+=	 -Wno-c++11-extensions
243
244.if ${MK_SSP} != "no"
245# Don't use -Wstack-protector as it breaks world with -Werror.
246SSP_CFLAGS?=	-fstack-protector-strong
247CFLAGS+=	${SSP_CFLAGS}
248.endif # SSP
249
250# Additional flags passed in CFLAGS and CXXFLAGS when MK_DEBUG_FILES is
251# enabled.
252DEBUG_FILES_CFLAGS?= -g -gz=zlib
253
254# Allow user-specified additional warning flags, plus compiler and file
255# specific flag overrides, unless we've overridden this...
256.if ${MK_WARNS} != "no"
257CFLAGS+=	${CWARNFLAGS:M*} ${CWARNFLAGS.${COMPILER_TYPE}}
258CFLAGS+=	${CWARNFLAGS.${.IMPSRC:T}}
259CXXFLAGS+=	${CXXWARNFLAGS:M*} ${CXXWARNFLAGS.${COMPILER_TYPE}}
260CXXFLAGS+=	${CXXWARNFLAGS.${.IMPSRC:T}}
261.endif
262
263CFLAGS+=	 ${CFLAGS.${COMPILER_TYPE}}
264CXXFLAGS+=	 ${CXXFLAGS.${COMPILER_TYPE}}
265
266AFLAGS+=	${AFLAGS.${.IMPSRC:T}}
267AFLAGS+=	${AFLAGS.${.TARGET:T}}
268ACFLAGS+=	${ACFLAGS.${.IMPSRC:T}}
269ACFLAGS+=	${ACFLAGS.${.TARGET:T}}
270CFLAGS+=	${CFLAGS.${.IMPSRC:T}}
271CXXFLAGS+=	${CXXFLAGS.${.IMPSRC:T}}
272
273LDFLAGS+=	${LDFLAGS.${LINKER_TYPE}}
274
275# Only allow .TARGET when not using PROGS as it has the same syntax
276# per PROG which is ambiguous with this syntax. This is only needed
277# for PROG_VARS vars.
278#
279# Some directories (currently just clang) also need to disable this since
280# CFLAGS.${COMPILER_TYPE}, CFLAGS.${.IMPSRC:T} and CFLAGS.${.TARGET:T} all live
281# in the same namespace, meaning that, for example, GCC builds of clang pick up
282# CFLAGS.clang via CFLAGS.${.TARGET:T} and thus try to pass Clang-specific
283# flags. Ideally the different sources of CFLAGS would be namespaced to avoid
284# collisions.
285.if !defined(_RECURSING_PROGS) && !defined(NO_TARGET_FLAGS)
286.if ${MK_WARNS} != "no"
287CFLAGS+=	${CWARNFLAGS.${.TARGET:T}}
288.endif
289CFLAGS+=	${CFLAGS.${.TARGET:T}}
290CXXFLAGS+=	${CXXFLAGS.${.TARGET:T}}
291LDFLAGS+=	${LDFLAGS.${.TARGET:T}}
292LDADD+=		${LDADD.${.TARGET:T}}
293LIBADD+=	${LIBADD.${.TARGET:T}}
294.endif
295
296.if defined(SRCTOP)
297# Prevent rebuilding during install to support read-only objdirs.
298.if ${.TARGETS:M*install*} == ${.TARGETS} && empty(.MAKE.MODE:Mmeta)
299CFLAGS+=	ERROR-tried-to-rebuild-during-make-install
300.endif
301.endif
302
303# Please keep this if in sync with kern.mk
304.if ${LD} != "ld" && (${CC:[1]:H} != ${LD:[1]:H} || ${LD:[1]:T} != "ld")
305# Add -fuse-ld=${LD} if $LD is in a different directory or not called "ld".
306.if ${COMPILER_TYPE} == "clang"
307# Note: Clang does not like relative paths for ld so we map ld.lld -> lld.
308.if ${COMPILER_VERSION} >= 120000
309LDFLAGS+=	--ld-path=${LD:[1]:S/^ld.//1W}
310.else
311LDFLAGS+=	-fuse-ld=${LD:[1]:S/^ld.//1W}
312.endif
313.else
314# GCC does not support an absolute path for -fuse-ld so we just print this
315# warning instead and let the user add the required symlinks.
316# However, we can avoid this warning if -B is set appropriately (e.g. for
317# CROSS_TOOLCHAIN=...-gcc).
318.if !(${LD:[1]:T} == "ld" && ${CC:tw:M-B${LD:[1]:H}/})
319.warning LD (${LD}) is not the default linker for ${CC} but -fuse-ld= is not supported
320.endif
321.endif
322.endif
323
324# Tell bmake not to mistake standard targets for things to be searched for
325# or expect to ever be up-to-date.
326PHONY_NOTMAIN = analyze afterdepend afterinstall all beforedepend beforeinstall \
327		beforelinking build build-tools buildconfig buildfiles \
328		buildincludes check checkdpadd clean cleandepend cleandir \
329		cleanobj configure depend distclean distribute exe \
330		files html includes install installconfig installdirs \
331		installfiles installincludes lint obj objlink objs objwarn \
332		realinstall tags whereobj
333
334# we don't want ${PROG} to be PHONY
335.PHONY: ${PHONY_NOTMAIN:N${PROG:U}}
336.NOTMAIN: ${PHONY_NOTMAIN:Nall}
337
338.if ${MK_STAGING} != "no"
339.if defined(_SKIP_BUILD) || (!make(all) && !make(clean*) && !make(*clean))
340_SKIP_STAGING?= yes
341.endif
342.if ${_SKIP_STAGING:Uno} == "yes"
343staging stage_libs stage_files stage_as stage_links stage_symlinks:
344.else
345# allow targets like beforeinstall to be leveraged
346DESTDIR= ${STAGE_OBJTOP}
347.export DESTDIR
348
349.if target(beforeinstall)
350.if !empty(_LIBS) || (${MK_STAGING_PROG} != "no" && !defined(INTERNALPROG))
351staging: beforeinstall
352.endif
353.endif
354
355# normally only libs and includes are staged
356.if ${MK_STAGING_PROG} != "no" && !defined(INTERNALPROG)
357STAGE_DIR.prog= ${STAGE_OBJTOP}${BINDIR}
358
359.if !empty(PROG)
360.if defined(PROGNAME)
361STAGE_AS_SETS+= prog
362STAGE_AS_${PROG}= ${PROGNAME}
363stage_as.prog: ${PROG}
364.else
365STAGE_SETS+= prog
366stage_files.prog: ${PROG}
367STAGE_TARGETS+= stage_files
368.endif
369.endif
370.endif
371
372.if !empty(_LIBS) && !defined(INTERNALLIB)
373.if defined(SHLIBDIR) && ${SHLIBDIR} != ${LIBDIR} && ${_LIBS:Uno:M*.so.*} != ""
374STAGE_SETS+= shlib
375STAGE_DIR.shlib= ${STAGE_OBJTOP}${SHLIBDIR}
376STAGE_FILES.shlib+= ${_LIBS:M*.so.*}
377stage_files.shlib: ${_LIBS:M*.so.*}
378.endif
379
380.if defined(SHLIB_LINK) && commands(${SHLIB_LINK:R}.ld)
381STAGE_AS_SETS+= ldscript
382STAGE_AS.ldscript+= ${SHLIB_LINK:R}.ld
383stage_as.ldscript: ${SHLIB_LINK:R}.ld
384STAGE_DIR.ldscript = ${STAGE_LIBDIR}
385STAGE_AS_${SHLIB_LINK:R}.ld:= ${SHLIB_LINK}
386NO_SHLIB_LINKS=
387.endif
388
389.if target(stage_files.shlib)
390stage_libs: ${_LIBS}
391.if defined(DEBUG_FLAGS) && target(${SHLIB_NAME}.symbols)
392stage_files.shlib: ${SHLIB_NAME}.symbols
393.endif
394.else
395stage_libs: ${_LIBS}
396.endif
397.if defined(SHLIB_NAME) && defined(DEBUG_FLAGS) && target(${SHLIB_NAME}.symbols)
398stage_libs: ${SHLIB_NAME}.symbols
399.endif
400
401.endif
402
403.if !empty(INCS) || !empty(INCSGROUPS) && target(buildincludes)
404.if !defined(NO_BEFOREBUILD_INCLUDES)
405stage_includes: buildincludes
406beforebuild: stage_includes
407.endif
408.endif
409
410.for t in stage_libs stage_files stage_as
411.if target($t)
412STAGE_TARGETS+= $t
413.endif
414.endfor
415
416.if !empty(STAGE_AS_SETS)
417STAGE_TARGETS+= stage_as
418.endif
419
420.if !empty(STAGE_TARGETS) || (${MK_STAGING_PROG} != "no" && !defined(INTERNALPROG))
421
422.if !empty(LINKS)
423STAGE_TARGETS+= stage_links
424.if ${MAKE_VERSION} < 20131001
425stage_links.links: ${_LIBS} ${PROG}
426.endif
427STAGE_SETS+= links
428STAGE_LINKS.links= ${LINKS}
429.endif
430
431.if !empty(SYMLINKS)
432STAGE_TARGETS+= stage_symlinks
433STAGE_SETS+= links
434STAGE_SYMLINKS.links= ${SYMLINKS}
435.endif
436
437.endif
438
439.include <meta.stage.mk>
440.endif
441.endif
442
443.if defined(META_TARGETS)
444.for _tgt in ${META_TARGETS}
445.if target(${_tgt})
446${_tgt}: ${META_DEPS}
447.endif
448.endfor
449.endif
450