xref: /freebsd/share/mk/bsd.sys.mk (revision 65a1d63665bf8b9cd2596d4319b31efc2232b722)
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# -pedantic is problematic because it also imposes namespace restrictions
32#CFLAGS+=	-pedantic
33.if defined(WARNS)
34.if ${WARNS} >= 1
35CWARNFLAGS+=	-Wsystem-headers
36.if !defined(NO_WERROR) && !defined(NO_WERROR.${COMPILER_TYPE})
37CWARNFLAGS+=	-Werror
38.endif # !NO_WERROR && !NO_WERROR.${COMPILER_TYPE}
39.endif # WARNS >= 1
40.if ${WARNS} >= 2
41CWARNFLAGS+=	-Wall -Wno-format-y2k
42.endif # WARNS >= 2
43.if ${WARNS} >= 3
44CWARNFLAGS+=	-W -Wno-unused-parameter -Wstrict-prototypes\
45		-Wmissing-prototypes -Wpointer-arith
46.endif # WARNS >= 3
47.if ${WARNS} >= 4
48CWARNFLAGS+=	-Wreturn-type -Wcast-qual -Wwrite-strings -Wswitch -Wshadow\
49		-Wunused-parameter
50.if !defined(NO_WCAST_ALIGN) && !defined(NO_WCAST_ALIGN.${COMPILER_TYPE})
51CWARNFLAGS+=	-Wcast-align
52.endif # !NO_WCAST_ALIGN !NO_WCAST_ALIGN.${COMPILER_TYPE}
53.endif # WARNS >= 4
54.if ${WARNS} >= 6
55CWARNFLAGS+=	-Wchar-subscripts -Winline -Wnested-externs -Wredundant-decls\
56		-Wold-style-definition
57.if !defined(NO_WMISSING_VARIABLE_DECLARATIONS)
58CWARNFLAGS.clang+=	-Wmissing-variable-declarations
59.endif
60.if !defined(NO_WTHREAD_SAFETY)
61CWARNFLAGS.clang+=	-Wthread-safety
62.endif
63.endif # WARNS >= 6
64.if ${WARNS} >= 2 && ${WARNS} <= 4
65# XXX Delete -Wuninitialized by default for now -- the compiler doesn't
66# XXX always get it right.
67CWARNFLAGS+=	-Wno-uninitialized
68.endif # WARNS >=2 && WARNS <= 4
69CWARNFLAGS+=	-Wno-pointer-sign
70# Clang has more warnings enabled by default, and when using -Wall, so if WARNS
71# is set to low values, these have to be disabled explicitly.
72.if ${WARNS} <= 6
73CWARNFLAGS.clang+=	-Wno-empty-body -Wno-string-plus-int
74CWARNFLAGS.clang+=	-Wno-unused-const-variable
75.endif # WARNS <= 6
76.if ${WARNS} <= 3
77CWARNFLAGS.clang+=	-Wno-tautological-compare -Wno-unused-value\
78		-Wno-parentheses-equality -Wno-unused-function -Wno-enum-conversion
79CWARNFLAGS.clang+=	-Wno-unused-local-typedef
80CWARNFLAGS.clang+=	-Wno-address-of-packed-member
81.if ${COMPILER_TYPE} == "gcc" && ${COMPILER_VERSION} >= 90100
82CWARNFLAGS.gcc+=	-Wno-address-of-packed-member
83.endif
84.if ${COMPILER_TYPE} == "clang" && ${COMPILER_VERSION} >= 70000 && \
85    ${MACHINE_CPUARCH} == "arm" && !${MACHINE_ARCH:Marmv[67]*}
86CWARNFLAGS.clang+=	-Wno-atomic-alignment
87.endif
88.endif # WARNS <= 3
89.if ${WARNS} <= 2
90CWARNFLAGS.clang+=	-Wno-switch -Wno-switch-enum -Wno-knr-promoted-parameter
91.endif # WARNS <= 2
92.if ${WARNS} <= 1
93CWARNFLAGS.clang+=	-Wno-parentheses
94.endif # WARNS <= 1
95.if defined(NO_WARRAY_BOUNDS)
96CWARNFLAGS.clang+=	-Wno-array-bounds
97.endif # NO_WARRAY_BOUNDS
98.if defined(NO_WMISLEADING_INDENTATION) && \
99    ((${COMPILER_TYPE} == "clang" && ${COMPILER_VERSION} >= 100000) || \
100      ${COMPILER_TYPE} == "gcc")
101CWARNFLAGS+=		-Wno-misleading-indentation
102.endif # NO_WMISLEADING_INDENTATION
103.endif # WARNS
104
105.if defined(FORMAT_AUDIT)
106WFORMAT=	1
107.endif # FORMAT_AUDIT
108.if defined(WFORMAT)
109.if ${WFORMAT} > 0
110#CWARNFLAGS+=	-Wformat-nonliteral -Wformat-security -Wno-format-extra-args
111CWARNFLAGS+=	-Wformat=2 -Wno-format-extra-args
112.if ${WARNS} <= 3
113CWARNFLAGS.clang+=	-Wno-format-nonliteral
114.endif # WARNS <= 3
115.if !defined(NO_WERROR) && !defined(NO_WERROR.${COMPILER_TYPE})
116CWARNFLAGS+=	-Werror
117.endif # !NO_WERROR && !NO_WERROR.${COMPILER_TYPE}
118.endif # WFORMAT > 0
119.endif # WFORMAT
120.if defined(NO_WFORMAT) || defined(NO_WFORMAT.${COMPILER_TYPE})
121CWARNFLAGS+=	-Wno-format
122.endif # NO_WFORMAT || NO_WFORMAT.${COMPILER_TYPE}
123
124# GCC
125# We should clean up warnings produced with these flags.
126# They were originally added as a quick hack to enable gcc5/6.
127.if ${COMPILER_TYPE} == "gcc"
128CWARNFLAGS+=	-Wno-error=address			\
129		-Wno-error=array-bounds			\
130		-Wno-error=attributes			\
131		-Wno-error=bool-compare			\
132		-Wno-error=cast-align			\
133		-Wno-error=clobbered			\
134		-Wno-error=deprecated-declarations	\
135		-Wno-error=enum-compare			\
136		-Wno-error=extra			\
137		-Wno-error=inline			\
138		-Wno-error=logical-not-parentheses	\
139		-Wno-error=nonnull-compare		\
140		-Wno-error=shift-negative-value		\
141		-Wno-error=strict-aliasing		\
142		-Wno-error=tautological-compare		\
143		-Wno-error=uninitialized		\
144		-Wno-error=unused-but-set-variable	\
145		-Wno-error=unused-const-variable	\
146		-Wno-error=unused-function		\
147		-Wno-error=unused-value
148
149# GCC 7.1.0
150.if ${COMPILER_VERSION} >= 70100
151CWARNFLAGS+=	-Wno-error=bool-operation		\
152		-Wno-error=deprecated			\
153		-Wno-error=expansion-to-defined		\
154		-Wno-error=format-overflow		\
155		-Wno-error=format-truncation		\
156		-Wno-error=implicit-fallthrough		\
157		-Wno-error=int-in-bool-context		\
158		-Wno-error=memset-elt-size		\
159		-Wno-error=noexcept-type		\
160		-Wno-error=nonnull			\
161		-Wno-error=pointer-compare		\
162		-Wno-error=stringop-overflow
163.endif
164
165# GCC 8.1.0
166.if ${COMPILER_VERSION} >= 80100
167CWARNFLAGS+=	-Wno-error=aggressive-loop-optimizations	\
168		-Wno-error=cast-function-type			\
169		-Wno-error=catch-value				\
170		-Wno-error=multistatement-macros		\
171		-Wno-error=restrict				\
172		-Wno-error=sizeof-pointer-memaccess		\
173		-Wno-error=stringop-truncation
174.endif
175.endif	# gcc
176
177# How to handle FreeBSD custom printf format specifiers.
178.if ${COMPILER_TYPE} == "clang"
179FORMAT_EXTENSIONS=	-D__printf__=__freebsd_kprintf__
180.else
181FORMAT_EXTENSIONS=	-fformat-extensions
182.endif
183
184.if defined(IGNORE_PRAGMA)
185CWARNFLAGS+=	-Wno-unknown-pragmas
186.endif # IGNORE_PRAGMA
187
188# This warning is utter nonsense
189CFLAGS+=	-Wno-format-zero-length
190
191.if ${COMPILER_TYPE} == "clang"
192# The headers provided by clang are incompatible with the FreeBSD headers.
193# If the version of clang is not one that has been patched to omit the
194# incompatible headers, we need to compile with -nobuiltininc and add the
195# resource dir to the end of the search paths. This ensures that headers such as
196# immintrin.h are still found but stddef.h, etc. are picked up from FreeBSD.
197#
198# XXX: This is a hack to support complete external installs of clang while
199# we work to synchronize our decleration guards with those in the clang tree.
200.if ${MK_CLANG_BOOTSTRAP:Uno} == "no" && \
201    ${COMPILER_RESOURCE_DIR} != "unknown" && !defined(BOOTSTRAPPING)
202CFLAGS+=-nobuiltininc -idirafter ${COMPILER_RESOURCE_DIR}/include
203.endif
204.endif
205
206CLANG_OPT_SMALL= -mstack-alignment=8 -mllvm -inline-threshold=3\
207		 -mllvm -simplifycfg-dup-ret
208CLANG_OPT_SMALL+= -mllvm -enable-load-pre=false
209CFLAGS.clang+=	 -Qunused-arguments
210# The libc++ headers use c++11 extensions.  These are normally silenced because
211# they are treated as system headers, but we explicitly disable that warning
212# suppression when building the base system to catch bugs in our headers.
213# Eventually we'll want to start building the base system C++ code as C++11,
214# but not yet.
215CXXFLAGS.clang+=	 -Wno-c++11-extensions
216
217.if ${MK_SSP} != "no" && \
218    ${MACHINE_CPUARCH} != "arm" && ${MACHINE_CPUARCH} != "mips"
219# Don't use -Wstack-protector as it breaks world with -Werror.
220SSP_CFLAGS?=	-fstack-protector-strong
221CFLAGS+=	${SSP_CFLAGS}
222.endif # SSP && !ARM && !MIPS
223
224# Additional flags passed in CFLAGS and CXXFLAGS when MK_DEBUG_FILES is
225# enabled.
226DEBUG_FILES_CFLAGS?= -g
227
228# Allow user-specified additional warning flags, plus compiler and file
229# specific flag overrides, unless we've overridden this...
230.if ${MK_WARNS} != "no"
231CFLAGS+=	${CWARNFLAGS:M*} ${CWARNFLAGS.${COMPILER_TYPE}}
232CFLAGS+=	${CWARNFLAGS.${.IMPSRC:T}}
233CXXFLAGS+=	${CXXWARNFLAGS:M*} ${CXXWARNFLAGS.${COMPILER_TYPE}}
234CXXFLAGS+=	${CXXWARNFLAGS.${.IMPSRC:T}}
235.endif
236
237CFLAGS+=	 ${CFLAGS.${COMPILER_TYPE}}
238CXXFLAGS+=	 ${CXXFLAGS.${COMPILER_TYPE}}
239
240AFLAGS+=	${AFLAGS.${.IMPSRC:T}}
241AFLAGS+=	${AFLAGS.${.TARGET:T}}
242ACFLAGS+=	${ACFLAGS.${.IMPSRC:T}}
243ACFLAGS+=	${ACFLAGS.${.TARGET:T}}
244CFLAGS+=	${CFLAGS.${.IMPSRC:T}}
245CXXFLAGS+=	${CXXFLAGS.${.IMPSRC:T}}
246
247LDFLAGS+=	${LDFLAGS.${LINKER_TYPE}}
248
249# Only allow .TARGET when not using PROGS as it has the same syntax
250# per PROG which is ambiguous with this syntax. This is only needed
251# for PROG_VARS vars.
252.if !defined(_RECURSING_PROGS)
253.if ${MK_WARNS} != "no"
254CFLAGS+=	${CWARNFLAGS.${.TARGET:T}}
255.endif
256CFLAGS+=	${CFLAGS.${.TARGET:T}}
257CXXFLAGS+=	${CXXFLAGS.${.TARGET:T}}
258LDFLAGS+=	${LDFLAGS.${.TARGET:T}}
259LDADD+=		${LDADD.${.TARGET:T}}
260LIBADD+=	${LIBADD.${.TARGET:T}}
261.endif
262
263.if defined(SRCTOP)
264# Prevent rebuilding during install to support read-only objdirs.
265.if ${.TARGETS:M*install*} == ${.TARGETS} && empty(.MAKE.MODE:Mmeta)
266CFLAGS+=	ERROR-tried-to-rebuild-during-make-install
267.endif
268.endif
269
270# Tell bmake not to mistake standard targets for things to be searched for
271# or expect to ever be up-to-date.
272PHONY_NOTMAIN = analyze afterdepend afterinstall all beforedepend beforeinstall \
273		beforelinking build build-tools buildconfig buildfiles \
274		buildincludes check checkdpadd clean cleandepend cleandir \
275		cleanobj configure depend distclean distribute exe \
276		files html includes install installconfig installdirs \
277		installfiles installincludes lint obj objlink objs objwarn \
278		realinstall tags whereobj
279
280# we don't want ${PROG} to be PHONY
281.PHONY: ${PHONY_NOTMAIN:N${PROG:U}}
282.NOTMAIN: ${PHONY_NOTMAIN:Nall}
283
284.if ${MK_STAGING} != "no"
285.if defined(_SKIP_BUILD) || (!make(all) && !make(clean*) && !make(*clean))
286_SKIP_STAGING?= yes
287.endif
288.if ${_SKIP_STAGING:Uno} == "yes"
289staging stage_libs stage_files stage_as stage_links stage_symlinks:
290.else
291# allow targets like beforeinstall to be leveraged
292DESTDIR= ${STAGE_OBJTOP}
293.export DESTDIR
294
295.if target(beforeinstall)
296.if !empty(_LIBS) || (${MK_STAGING_PROG} != "no" && !defined(INTERNALPROG))
297staging: beforeinstall
298.endif
299.endif
300
301# normally only libs and includes are staged
302.if ${MK_STAGING_PROG} != "no" && !defined(INTERNALPROG)
303STAGE_DIR.prog= ${STAGE_OBJTOP}${BINDIR}
304
305.if !empty(PROG)
306.if defined(PROGNAME)
307STAGE_AS_SETS+= prog
308STAGE_AS_${PROG}= ${PROGNAME}
309stage_as.prog: ${PROG}
310.else
311STAGE_SETS+= prog
312stage_files.prog: ${PROG}
313STAGE_TARGETS+= stage_files
314.endif
315.endif
316.endif
317
318.if !empty(_LIBS) && !defined(INTERNALLIB)
319.if defined(SHLIBDIR) && ${SHLIBDIR} != ${LIBDIR} && ${_LIBS:Uno:M*.so.*} != ""
320STAGE_SETS+= shlib
321STAGE_DIR.shlib= ${STAGE_OBJTOP}${SHLIBDIR}
322STAGE_FILES.shlib+= ${_LIBS:M*.so.*}
323stage_files.shlib: ${_LIBS:M*.so.*}
324.endif
325
326.if defined(SHLIB_LINK) && commands(${SHLIB_LINK:R}.ld)
327STAGE_AS_SETS+= ldscript
328STAGE_AS.ldscript+= ${SHLIB_LINK:R}.ld
329stage_as.ldscript: ${SHLIB_LINK:R}.ld
330STAGE_DIR.ldscript = ${STAGE_LIBDIR}
331STAGE_AS_${SHLIB_LINK:R}.ld:= ${SHLIB_LINK}
332NO_SHLIB_LINKS=
333.endif
334
335.if target(stage_files.shlib)
336stage_libs: ${_LIBS}
337.if defined(DEBUG_FLAGS) && target(${SHLIB_NAME}.symbols)
338stage_files.shlib: ${SHLIB_NAME}.symbols
339.endif
340.else
341stage_libs: ${_LIBS}
342.endif
343.if defined(SHLIB_NAME) && defined(DEBUG_FLAGS) && target(${SHLIB_NAME}.symbols)
344stage_libs: ${SHLIB_NAME}.symbols
345.endif
346
347.endif
348
349.if !empty(INCS) || !empty(INCSGROUPS) && target(buildincludes)
350.if !defined(NO_BEFOREBUILD_INCLUDES)
351stage_includes: buildincludes
352beforebuild: stage_includes
353.endif
354.endif
355
356.for t in stage_libs stage_files stage_as
357.if target($t)
358STAGE_TARGETS+= $t
359.endif
360.endfor
361
362.if !empty(STAGE_AS_SETS)
363STAGE_TARGETS+= stage_as
364.endif
365
366.if !empty(STAGE_TARGETS) || (${MK_STAGING_PROG} != "no" && !defined(INTERNALPROG))
367
368.if !empty(LINKS)
369STAGE_TARGETS+= stage_links
370.if ${MAKE_VERSION} < 20131001
371stage_links.links: ${_LIBS} ${PROG}
372.endif
373STAGE_SETS+= links
374STAGE_LINKS.links= ${LINKS}
375.endif
376
377.if !empty(SYMLINKS)
378STAGE_TARGETS+= stage_symlinks
379STAGE_SETS+= links
380STAGE_SYMLINKS.links= ${SYMLINKS}
381.endif
382
383.endif
384
385.include <meta.stage.mk>
386.endif
387.endif
388
389.if defined(META_TARGETS)
390.for _tgt in ${META_TARGETS}
391.if target(${_tgt})
392${_tgt}: ${META_DEPS}
393.endif
394.endfor
395.endif
396