xref: /freebsd/share/mk/bsd.sys.mk (revision edf8578117e8844e02c0121147f45e4609b30680) 
1#
2# This file contains common settings used for building FreeBSD
3# sources.
4
5# Enable various levels of compiler warning checks.  These may be
6# overridden (e.g. if using a non-gcc compiler) by defining MK_WARNS=no.
7
8# for GCC:   https://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html
9# for clang: https://clang.llvm.org/docs/DiagnosticsReference.html
10
11.include <bsd.compiler.mk>
12
13# the default is gnu99 for now
14CSTD?=		gnu99
15
16.if ${CSTD} == "c89" || ${CSTD} == "c90"
17CFLAGS+=	-std=iso9899:1990
18.elif ${CSTD} == "c94" || ${CSTD} == "c95"
19CFLAGS+=	-std=iso9899:199409
20.elif ${CSTD} == "c99"
21CFLAGS+=	-std=iso9899:1999
22.else # CSTD
23CFLAGS+=	-std=${CSTD}
24.endif # CSTD
25
26.if !empty(CXXSTD)
27CXXFLAGS+=	-std=${CXXSTD}
28.endif
29
30# This gives the Makefile we're evaluating at the top-level a chance to set
31# WARNS.  If it doesn't do so, we may freely pull a DEFAULTWARNS if it's set
32# and use that.  This allows us to default WARNS to 6 for src builds without
33# needing to set the default in various Makefile.inc.
34.if !defined(WARNS) && defined(DEFAULTWARNS)
35WARNS=	${DEFAULTWARNS}
36.endif
37
38# -pedantic is problematic because it also imposes namespace restrictions
39#CFLAGS+=	-pedantic
40.if defined(WARNS)
41.if ${WARNS} >= 1
42CWARNFLAGS+=	-Wsystem-headers
43.if ${MK_WERROR} != "no" && ${MK_WERROR.${COMPILER_TYPE}:Uyes} != "no"
44CWARNFLAGS+=	-Werror
45.endif # ${MK_WERROR} != "no" && ${MK_WERROR.${COMPILER_TYPE}:Uyes} != "no"
46.endif # WARNS >= 1
47.if ${WARNS} >= 2
48CWARNFLAGS+=	-Wall -Wno-format-y2k
49.endif # WARNS >= 2
50.if ${WARNS} >= 3
51CWARNFLAGS+=	-W -Wno-unused-parameter
52.if ${COMPILER_TYPE} == "clang"
53CWARNFLAGS+=	-Wstrict-prototypes
54.endif
55CWARNFLAGS+=	-Wmissing-prototypes -Wpointer-arith
56.endif # WARNS >= 3
57.if ${WARNS} >= 4
58CWARNFLAGS+=	-Wreturn-type -Wcast-qual -Wwrite-strings -Wswitch -Wshadow\
59		-Wunused-parameter
60.if !defined(NO_WCAST_ALIGN) && !defined(NO_WCAST_ALIGN.${COMPILER_TYPE})
61CWARNFLAGS+=	-Wcast-align
62.endif # !NO_WCAST_ALIGN !NO_WCAST_ALIGN.${COMPILER_TYPE}
63.endif # WARNS >= 4
64.if ${WARNS} >= 6
65CWARNFLAGS+=	-Wchar-subscripts -Wnested-externs \
66		-Wold-style-definition
67.if !defined(NO_WMISSING_VARIABLE_DECLARATIONS)
68CWARNFLAGS.clang+=	-Wmissing-variable-declarations
69.endif
70.if !defined(NO_WTHREAD_SAFETY)
71CWARNFLAGS.clang+=	-Wthread-safety
72.endif
73.endif # WARNS >= 6
74.if ${WARNS} >= 2 && ${WARNS} <= 4
75# XXX Delete -Wuninitialized by default for now -- the compiler doesn't
76# XXX always get it right.
77CWARNFLAGS+=	-Wno-uninitialized
78.endif # WARNS >=2 && WARNS <= 4
79CWARNFLAGS+=	-Wno-pointer-sign
80.if !defined(NO_WDATE_TIME)
81CWARNFLAGS+=	-Wdate-time
82.endif # NO_WDATE_TIME
83# Clang has more warnings enabled by default, and when using -Wall, so if WARNS
84# is set to low values, these have to be disabled explicitly.
85.if ${WARNS} <= 6
86CWARNFLAGS.clang+=	-Wno-empty-body -Wno-string-plus-int
87CWARNFLAGS.clang+=	-Wno-unused-const-variable
88.if ${COMPILER_TYPE} == "clang" && ${COMPILER_VERSION} >= 150000
89CWARNFLAGS.clang+=	-Wno-error=unused-but-set-parameter
90.endif
91.endif # WARNS <= 6
92.if ${WARNS} <= 3
93CWARNFLAGS.clang+=	-Wno-tautological-compare -Wno-unused-value\
94		-Wno-parentheses-equality -Wno-unused-function -Wno-enum-conversion
95CWARNFLAGS.clang+=	-Wno-unused-local-typedef
96CWARNFLAGS.clang+=	-Wno-address-of-packed-member
97.if ${COMPILER_TYPE} == "gcc" && ${COMPILER_VERSION} >= 90100
98CWARNFLAGS.gcc+=	-Wno-address-of-packed-member
99.endif
100.endif # WARNS <= 3
101.if ${WARNS} <= 2
102CWARNFLAGS.clang+=	-Wno-switch -Wno-switch-enum -Wno-knr-promoted-parameter
103.endif # WARNS <= 2
104.if ${WARNS} <= 1
105CWARNFLAGS.clang+=	-Wno-parentheses
106.endif # WARNS <= 1
107.if defined(NO_WARRAY_BOUNDS)
108CWARNFLAGS.clang+=	-Wno-array-bounds
109.endif # NO_WARRAY_BOUNDS
110.if defined(NO_WMISLEADING_INDENTATION) && \
111    ((${COMPILER_TYPE} == "clang" && ${COMPILER_VERSION} >= 100000) || \
112      ${COMPILER_TYPE} == "gcc")
113CWARNFLAGS+=		-Wno-misleading-indentation
114.endif # NO_WMISLEADING_INDENTATION
115.if ${COMPILER_VERSION} >= 130000
116NO_WUNUSED_BUT_SET_VARIABLE=	-Wno-unused-but-set-variable
117.endif
118.if ${COMPILER_TYPE} == "clang" && ${COMPILER_VERSION} >= 140000
119NO_WBITWISE_INSTEAD_OF_LOGICAL=	-Wno-bitwise-instead-of-logical
120.endif
121.if ${COMPILER_TYPE} == "clang" && ${COMPILER_VERSION} >= 150000
122NO_WARRAY_PARAMETER=	-Wno-array-parameter
123NO_WSTRICT_PROTOTYPES=	-Wno-strict-prototypes
124NO_WDEPRECATED_NON_PROTOTYPE=-Wno-deprecated-non-prototype
125.endif
126.if ${COMPILER_TYPE} == "gcc" && ${COMPILER_VERSION} >= 50200
127NO_WUNUSED_BUT_SET_VARIABLE=-Wno-unused-but-set-variable
128.endif
129.if ${COMPILER_TYPE} == "gcc" && ${COMPILER_VERSION} >= 100100
130NO_WZERO_LENGTH_BOUNDS=	-Wno-zero-length-bounds
131.endif
132.if ${COMPILER_TYPE} == "gcc" && ${COMPILER_VERSION} >= 110100
133NO_WARRAY_PARAMETER=	-Wno-array-parameter
134.endif
135.if ${COMPILER_TYPE} == "gcc" && ${COMPILER_VERSION} >= 120100
136NO_WUSE_AFTER_FREE=	-Wno-use-after-free
137NO_WDANGLING_POINTER=	-Wno-dangling-pointer
138.endif
139.endif # WARNS
140
141.if defined(FORMAT_AUDIT)
142WFORMAT=	1
143.endif # FORMAT_AUDIT
144.if defined(WFORMAT)
145.if ${WFORMAT} > 0
146#CWARNFLAGS+=	-Wformat-nonliteral -Wformat-security -Wno-format-extra-args
147CWARNFLAGS+=	-Wformat=2 -Wno-format-extra-args
148.if ${WARNS:U0} <= 3
149CWARNFLAGS.clang+=	-Wno-format-nonliteral
150.endif # WARNS <= 3
151.if ${MK_WERROR} != "no" && ${MK_WERROR.${COMPILER_TYPE}:Uyes} != "no"
152CWARNFLAGS+=	-Werror
153.endif # ${MK_WERROR} != "no" && ${MK_WERROR.${COMPILER_TYPE}:Uyes} != "no"
154.endif # WFORMAT > 0
155.endif # WFORMAT
156.if defined(NO_WFORMAT) || defined(NO_WFORMAT.${COMPILER_TYPE})
157CWARNFLAGS+=	-Wno-format
158.endif # NO_WFORMAT || NO_WFORMAT.${COMPILER_TYPE}
159
160# GCC
161# We should clean up warnings produced with these flags.
162# They were originally added as a quick hack to enable gcc5/6.
163# The base system requires at least GCC 6.4, but some ports
164# use this file with older compilers.  Request an exprun
165# before changing these.
166.if ${COMPILER_TYPE} == "gcc"
167# GCC 5.2.0
168.if ${COMPILER_VERSION} >= 50200
169CWARNFLAGS+=	-Wno-error=address			\
170		-Wno-error=array-bounds			\
171		-Wno-error=attributes			\
172		-Wno-error=bool-compare			\
173		-Wno-error=cast-align			\
174		-Wno-error=clobbered			\
175		-Wno-error=deprecated-declarations	\
176		-Wno-error=enum-compare			\
177		-Wno-error=extra			\
178		-Wno-error=logical-not-parentheses	\
179		-Wno-error=strict-aliasing		\
180		-Wno-error=uninitialized		\
181		-Wno-error=unused-function		\
182		-Wno-error=unused-value
183.endif
184
185# GCC 6.1.0
186.if ${COMPILER_VERSION} >= 60100
187CWARNFLAGS+=	-Wno-error=empty-body			\
188		-Wno-error=maybe-uninitialized		\
189		-Wno-error=nonnull-compare		\
190		-Wno-error=shift-negative-value		\
191		-Wno-error=tautological-compare		\
192		-Wno-error=unused-const-variable
193.endif
194
195# GCC 7.1.0
196.if ${COMPILER_VERSION} >= 70100
197CWARNFLAGS+=	-Wno-error=bool-operation		\
198		-Wno-error=deprecated			\
199		-Wno-error=expansion-to-defined		\
200		-Wno-error=format-overflow		\
201		-Wno-error=format-truncation		\
202		-Wno-error=implicit-fallthrough		\
203		-Wno-error=int-in-bool-context		\
204		-Wno-error=memset-elt-size		\
205		-Wno-error=noexcept-type		\
206		-Wno-error=nonnull			\
207		-Wno-error=pointer-compare		\
208		-Wno-error=stringop-overflow
209.endif
210
211# GCC 8.1.0
212.if ${COMPILER_VERSION} >= 80100
213CWARNFLAGS+=	-Wno-error=aggressive-loop-optimizations	\
214		-Wno-error=cast-function-type			\
215		-Wno-error=catch-value				\
216		-Wno-error=multistatement-macros		\
217		-Wno-error=restrict				\
218		-Wno-error=sizeof-pointer-memaccess		\
219		-Wno-error=stringop-truncation
220.endif
221
222# GCC 9.2.0
223.if ${COMPILER_VERSION} >= 90200
224.if ${MACHINE_ARCH} == "i386"
225CWARNFLAGS+=	-Wno-error=overflow
226.endif
227.endif
228
229# GCC 12.1.0
230.if ${COMPILER_VERSION} >= 120100
231# These warnings are raised by headers in libc++ so are disabled
232# globally for all C++
233CXXWARNFLAGS+=	-Wno-literal-suffix 			\
234		-Wno-error=unknown-pragmas
235.endif
236
237# GCC produces false positives for functions that switch on an
238# enum (GCC bug 87950)
239CWARNFLAGS+=	-Wno-return-type
240
241# GCC's own arm_neon.h triggers various warnings
242.if ${MACHINE_CPUARCH} == "aarch64"
243CWARNFLAGS+=	-Wno-system-headers
244.endif
245.endif	# gcc
246
247# How to handle FreeBSD custom printf format specifiers.
248.if ${COMPILER_TYPE} == "clang" || \
249    (${COMPILER_TYPE} == "gcc" && ${COMPILER_VERSION} >= 120100)
250FORMAT_EXTENSIONS=	-D__printf__=__freebsd_kprintf__
251.else
252FORMAT_EXTENSIONS=	-fformat-extensions
253.endif
254
255.if defined(IGNORE_PRAGMA)
256CWARNFLAGS+=	-Wno-unknown-pragmas
257.endif # IGNORE_PRAGMA
258
259# This warning is utter nonsense
260CFLAGS+=	-Wno-format-zero-length
261
262.if ${COMPILER_TYPE} == "clang"
263# The headers provided by clang are incompatible with the FreeBSD headers.
264# If the version of clang is not one that has been patched to omit the
265# incompatible headers, we need to compile with -nobuiltininc and add the
266# resource dir to the end of the search paths. This ensures that headers such as
267# immintrin.h are still found but stddef.h, etc. are picked up from FreeBSD.
268#
269# XXX: This is a hack to support complete external installs of clang while
270# we work to synchronize our decleration guards with those in the clang tree.
271.if ${MK_CLANG_BOOTSTRAP:Uno} == "no" && \
272    ${COMPILER_RESOURCE_DIR} != "unknown" && !defined(BOOTSTRAPPING)
273CFLAGS+=-nobuiltininc -idirafter ${COMPILER_RESOURCE_DIR}/include
274.endif
275.endif
276
277CLANG_OPT_SMALL= -mstack-alignment=8 -mllvm -inline-threshold=3
278.if ${COMPILER_VERSION} < 130000
279CLANG_OPT_SMALL+= -mllvm -simplifycfg-dup-ret
280.endif
281CLANG_OPT_SMALL+= -mllvm -enable-load-pre=false
282CFLAGS.clang+=	 -Qunused-arguments
283# The libc++ headers use c++11 extensions.  These are normally silenced because
284# they are treated as system headers, but we explicitly disable that warning
285# suppression when building the base system to catch bugs in our headers.
286# Eventually we'll want to start building the base system C++ code as C++11,
287# but not yet.
288CXXFLAGS.clang+=	 -Wno-c++11-extensions
289
290.if ${MK_SSP} != "no"
291# Don't use -Wstack-protector as it breaks world with -Werror.
292SSP_CFLAGS?=	-fstack-protector-strong
293CFLAGS+=	${SSP_CFLAGS}
294.endif # SSP
295
296# Additional flags passed in CFLAGS and CXXFLAGS when MK_DEBUG_FILES is
297# enabled.
298DEBUG_FILES_CFLAGS?= -g -gz=zlib
299
300# Allow user-specified additional warning flags, plus compiler and file
301# specific flag overrides, unless we've overridden this...
302.if ${MK_WARNS} != "no"
303CFLAGS+=	${CWARNFLAGS:M*} ${CWARNFLAGS.${COMPILER_TYPE}}
304CFLAGS+=	${CWARNFLAGS.${.IMPSRC:T}}
305CXXFLAGS+=	${CXXWARNFLAGS:M*} ${CXXWARNFLAGS.${COMPILER_TYPE}}
306CXXFLAGS+=	${CXXWARNFLAGS.${.IMPSRC:T}}
307.endif
308
309CFLAGS+=	 ${CFLAGS.${COMPILER_TYPE}}
310CXXFLAGS+=	 ${CXXFLAGS.${COMPILER_TYPE}}
311
312AFLAGS+=	${AFLAGS.${.IMPSRC:T}}
313AFLAGS+=	${AFLAGS.${.TARGET:T}}
314ACFLAGS+=	${ACFLAGS.${.IMPSRC:T}}
315ACFLAGS+=	${ACFLAGS.${.TARGET:T}}
316CFLAGS+=	${CFLAGS.${.IMPSRC:T}}
317CXXFLAGS+=	${CXXFLAGS.${.IMPSRC:T}}
318
319LDFLAGS+=	${LDFLAGS.${LINKER_TYPE}}
320
321# Only allow .TARGET when not using PROGS as it has the same syntax
322# per PROG which is ambiguous with this syntax. This is only needed
323# for PROG_VARS vars.
324#
325# Some directories (currently just clang) also need to disable this since
326# CFLAGS.${COMPILER_TYPE}, CFLAGS.${.IMPSRC:T} and CFLAGS.${.TARGET:T} all live
327# in the same namespace, meaning that, for example, GCC builds of clang pick up
328# CFLAGS.clang via CFLAGS.${.TARGET:T} and thus try to pass Clang-specific
329# flags. Ideally the different sources of CFLAGS would be namespaced to avoid
330# collisions.
331.if !defined(_RECURSING_PROGS) && !defined(NO_TARGET_FLAGS)
332.if ${MK_WARNS} != "no"
333CFLAGS+=	${CWARNFLAGS.${.TARGET:T}}
334.endif
335CFLAGS+=	${CFLAGS.${.TARGET:T}}
336CXXFLAGS+=	${CXXFLAGS.${.TARGET:T}}
337LDFLAGS+=	${LDFLAGS.${.TARGET:T}}
338LDADD+=		${LDADD.${.TARGET:T}}
339LIBADD+=	${LIBADD.${.TARGET:T}}
340.endif
341
342.if defined(SRCTOP)
343# Prevent rebuilding during install to support read-only objdirs.
344.if ${.TARGETS:M*install*} == ${.TARGETS} && empty(.MAKE.MODE:Mmeta)
345CFLAGS+=	ERROR-tried-to-rebuild-during-make-install
346.endif
347.endif
348
349# Please keep this if in sync with kern.mk
350.if ${LD} != "ld" && (${CC:[1]:H} != ${LD:[1]:H} || ${LD:[1]:T} != "ld")
351# Add -fuse-ld=${LD} if $LD is in a different directory or not called "ld".
352.if ${COMPILER_TYPE} == "clang"
353# Note: Clang does not like relative paths for ld so we map ld.lld -> lld.
354.if ${COMPILER_VERSION} >= 120000
355LDFLAGS+=	--ld-path=${LD:[1]:S/^ld.//1W}
356.else
357LDFLAGS+=	-fuse-ld=${LD:[1]:S/^ld.//1W}
358.endif
359.elif ${COMPILER_TYPE} == "gcc"
360# GCC does not support an absolute path for -fuse-ld so we just print this
361# warning instead and let the user add the required symlinks.
362# However, we can avoid this warning if -B is set appropriately (e.g. for
363# CROSS_TOOLCHAIN=...-gcc).
364.if !(${LD:[1]:T} == "ld" && ${CC:tw:M-B${LD:[1]:H}/})
365.warning LD (${LD}) is not the default linker for ${CC} but -fuse-ld= is not supported
366.endif
367.endif
368.endif
369
370# Tell bmake not to mistake standard targets for things to be searched for
371# or expect to ever be up-to-date.
372PHONY_NOTMAIN = analyze afterdepend afterinstall all beforedepend beforeinstall \
373		beforelinking build build-tools buildconfig buildfiles \
374		buildincludes check checkdpadd clean cleandepend cleandir \
375		cleanobj configure depend distclean distribute exe \
376		files html includes install installconfig installdirs \
377		installfiles installincludes lint obj objlink objs objwarn \
378		realinstall tags whereobj
379
380# we don't want ${PROG} to be PHONY
381.PHONY: ${PHONY_NOTMAIN:N${PROG:U}}
382.NOTMAIN: ${PHONY_NOTMAIN:Nall}
383
384.if ${MK_STAGING} != "no"
385.if defined(_SKIP_BUILD) || (!make(all) && !make(clean*) && !make(*clean))
386_SKIP_STAGING?= yes
387.endif
388.if ${_SKIP_STAGING:Uno} == "yes"
389staging stage_libs stage_files stage_as stage_links stage_symlinks:
390.else
391# allow targets like beforeinstall to be leveraged
392DESTDIR= ${STAGE_OBJTOP}
393.export DESTDIR
394
395.if target(beforeinstall)
396.if !empty(_LIBS) || (${MK_STAGING_PROG} != "no" && !defined(INTERNALPROG))
397staging: beforeinstall
398.endif
399.endif
400
401# normally only libs and includes are staged
402.if ${MK_STAGING_PROG} != "no" && !defined(INTERNALPROG)
403STAGE_DIR.prog= ${STAGE_OBJTOP}${BINDIR}
404
405.if !empty(PROG)
406.if defined(PROGNAME)
407STAGE_AS_SETS+= prog
408STAGE_AS_${PROG}= ${PROGNAME}
409stage_as.prog: ${PROG}
410.else
411STAGE_SETS+= prog
412stage_files.prog: ${PROG}
413STAGE_TARGETS+= stage_files
414.endif
415.endif
416.endif
417
418.if !empty(_LIBS) && !defined(INTERNALLIB)
419.if defined(SHLIBDIR) && ${SHLIBDIR} != ${LIBDIR} && ${_LIBS:Uno:M*.so.*} != ""
420STAGE_SETS+= shlib
421STAGE_DIR.shlib= ${STAGE_OBJTOP}${SHLIBDIR}
422STAGE_FILES.shlib+= ${_LIBS:M*.so.*}
423stage_files.shlib: ${_LIBS:M*.so.*}
424.endif
425
426.if defined(SHLIB_LINK) && commands(${SHLIB_LINK:R}.ld)
427STAGE_AS_SETS+= ldscript
428STAGE_AS.ldscript+= ${SHLIB_LINK:R}.ld
429stage_as.ldscript: ${SHLIB_LINK:R}.ld
430STAGE_DIR.ldscript = ${STAGE_LIBDIR}
431STAGE_AS_${SHLIB_LINK:R}.ld:= ${SHLIB_LINK}
432NO_SHLIB_LINKS=
433.endif
434
435.if defined(STATIC_LDSCRIPT) && target(lib${LIB}.ald)
436STAGE_AS_SETS+= ald
437STAGE_DIR.ald = ${STAGE_LIBDIR}
438STAGE_AS.ald+= lib${LIB}.ald
439STAGE_AS_lib${LIB}.ald = lib${LIB}.a
440stage_as.ald: lib${LIB}.ald
441.endif
442
443.if target(stage_files.shlib)
444stage_libs: ${_LIBS}
445.if defined(DEBUG_FLAGS) && target(${SHLIB_NAME}.symbols)
446stage_files.shlib: ${SHLIB_NAME}.symbols
447.endif
448.else
449stage_libs: ${_LIBS}
450.endif
451.if defined(SHLIB_NAME) && defined(DEBUG_FLAGS) && target(${SHLIB_NAME}.symbols)
452stage_libs: ${SHLIB_NAME}.symbols
453.endif
454
455.endif
456
457.if !empty(INCS) || !empty(INCSGROUPS) && target(buildincludes)
458.if !defined(NO_BEFOREBUILD_INCLUDES)
459stage_includes: buildincludes
460beforebuild: stage_includes
461.endif
462.endif
463
464.for t in stage_libs stage_files stage_as
465.if target($t)
466STAGE_TARGETS+= $t
467.endif
468.endfor
469
470.if !empty(STAGE_AS_SETS)
471STAGE_TARGETS+= stage_as
472.endif
473
474.if !empty(STAGE_TARGETS) || (${MK_STAGING_PROG} != "no" && !defined(INTERNALPROG))
475
476.if !empty(LINKS)
477STAGE_TARGETS+= stage_links
478.if ${MAKE_VERSION} < 20131001
479stage_links.links: ${_LIBS} ${PROG}
480.endif
481STAGE_SETS+= links
482STAGE_LINKS.links= ${LINKS}
483.endif
484
485.if !empty(SYMLINKS)
486STAGE_TARGETS+= stage_symlinks
487STAGE_SETS+= links
488STAGE_SYMLINKS.links= ${SYMLINKS}
489.endif
490
491.endif
492
493.include <meta.stage.mk>
494.endif
495.endif
496
497.if defined(META_TARGETS)
498.for _tgt in ${META_TARGETS}
499.if target(${_tgt})
500${_tgt}: ${META_DEPS}
501.endif
502.endfor
503.endif
504
505# we are generally the last makefile read
506CFLAGS+= ${CFLAGS_LAST}
507CXXFLAGS+= ${CXXFLAGS_LAST}
508LDFLAGS+= ${LDFLAGS_LAST}
509