1# $FreeBSD: stable/12/share/mk/bsd.sys.mk 372989 2023-03-22 22:30:10Z jhb $
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 4.2.1 GCC:   http://gcc.gnu.org/onlinedocs/gcc-4.2.1/gcc/Warning-Options.html
10# for current GCC: https://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html
11# for clang: https://clang.llvm.org/docs/DiagnosticsReference.html
12
13.include <bsd.compiler.mk>
14
15# the default is gnu99 for now
16CSTD?=		gnu99
17
18.if ${CSTD} == "c89" || ${CSTD} == "c90"
19CFLAGS+=	-std=iso9899:1990
20.elif ${CSTD} == "c94" || ${CSTD} == "c95"
21CFLAGS+=	-std=iso9899:199409
22.elif ${CSTD} == "c99"
23CFLAGS+=	-std=iso9899:1999
24.else # CSTD
25CFLAGS+=	-std=${CSTD}
26.endif # CSTD
27
28.if !empty(CXXSTD)
29CXXFLAGS+=	-std=${CXXSTD}
30.endif
31
32#
33# Turn off -Werror for gcc 4.2.1. The compiler is on the glide path out of the
34# system, and any warnings specific to it are no longer relevant as there are
35# too many false positives.
36#
37.if ${COMPILER_VERSION} <  50000
38NO_WERROR.gcc=	yes
39.endif
40
41# -pedantic is problematic because it also imposes namespace restrictions
42#CFLAGS+=	-pedantic
43.if defined(WARNS)
44.if ${WARNS} >= 1
45CWARNFLAGS+=	-Wsystem-headers
46.if !defined(NO_WERROR) && !defined(NO_WERROR.${COMPILER_TYPE})
47CWARNFLAGS+=	-Werror
48.endif # !NO_WERROR && !NO_WERROR.${COMPILER_TYPE}
49.endif # WARNS >= 1
50.if ${WARNS} >= 2
51CWARNFLAGS+=	-Wall -Wno-format-y2k
52.endif # WARNS >= 2
53.if ${WARNS} >= 3
54CWARNFLAGS+=	-W -Wno-unused-parameter -Wstrict-prototypes\
55		-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 -Winline -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# Clang has more warnings enabled by default, and when using -Wall, so if WARNS
81# is set to low values, these have to be disabled explicitly.
82.if ${WARNS} <= 6
83CWARNFLAGS.clang+=	-Wno-empty-body -Wno-string-plus-int
84.if ${COMPILER_TYPE} == "clang" && ${COMPILER_VERSION} >= 30400
85CWARNFLAGS.clang+=	-Wno-unused-const-variable
86.endif
87.if ${COMPILER_TYPE} == "clang" && ${COMPILER_VERSION} >= 130000
88CWARNFLAGS.clang+=	-Wno-error=unused-but-set-variable
89.endif
90.endif # WARNS <= 6
91.if ${WARNS} <= 3
92CWARNFLAGS.clang+=	-Wno-tautological-compare -Wno-unused-value\
93		-Wno-parentheses-equality -Wno-unused-function -Wno-enum-conversion
94.if ${COMPILER_TYPE} == "clang" && ${COMPILER_VERSION} >= 30600
95CWARNFLAGS.clang+=	-Wno-unused-local-typedef
96.endif
97.if ${COMPILER_TYPE} == "clang" && ${COMPILER_VERSION} >= 40000
98CWARNFLAGS.clang+=	-Wno-address-of-packed-member
99.endif
100.if ${COMPILER_TYPE} == "gcc" && ${COMPILER_VERSION} >= 90100
101CWARNFLAGS.gcc+=	-Wno-address-of-packed-member
102.endif
103.if ${COMPILER_TYPE} == "clang" && ${COMPILER_VERSION} >= 70000 && \
104    ${MACHINE_CPUARCH} == "arm" && !${MACHINE_ARCH:Marmv[67]*}
105CWARNFLAGS.clang+=	-Wno-atomic-alignment
106.endif
107.endif # WARNS <= 3
108.if ${WARNS} <= 2
109CWARNFLAGS.clang+=	-Wno-switch -Wno-switch-enum -Wno-knr-promoted-parameter
110.endif # WARNS <= 2
111.if ${WARNS} <= 1
112CWARNFLAGS.clang+=	-Wno-parentheses
113.endif # WARNS <= 1
114.if defined(NO_WARRAY_BOUNDS)
115CWARNFLAGS.clang+=	-Wno-array-bounds
116.endif # NO_WARRAY_BOUNDS
117.if defined(NO_WMISLEADING_INDENTATION) && \
118    ((${COMPILER_TYPE} == "clang" && ${COMPILER_VERSION} >= 100000) || \
119     (${COMPILER_TYPE} == "gcc" && ${COMPILER_VERSION} >= 60100))
120CWARNFLAGS+=		-Wno-misleading-indentation
121.endif # NO_WMISLEADING_INDENTATION
122.endif # WARNS
123
124.if defined(FORMAT_AUDIT)
125WFORMAT=	1
126.endif # FORMAT_AUDIT
127.if defined(WFORMAT)
128.if ${WFORMAT} > 0
129#CWARNFLAGS+=	-Wformat-nonliteral -Wformat-security -Wno-format-extra-args
130CWARNFLAGS+=	-Wformat=2 -Wno-format-extra-args
131.if ${WARNS} <= 3
132CWARNFLAGS.clang+=	-Wno-format-nonliteral
133.endif # WARNS <= 3
134.if !defined(NO_WERROR) && !defined(NO_WERROR.${COMPILER_TYPE})
135CWARNFLAGS+=	-Werror
136.endif # !NO_WERROR && !NO_WERROR.${COMPILER_TYPE}
137.endif # WFORMAT > 0
138.endif # WFORMAT
139.if defined(NO_WFORMAT) || defined(NO_WFORMAT.${COMPILER_TYPE})
140CWARNFLAGS+=	-Wno-format
141.endif # NO_WFORMAT || NO_WFORMAT.${COMPILER_TYPE}
142
143# GCC 5.2.0
144.if ${COMPILER_TYPE} == "gcc" && ${COMPILER_VERSION} >= 50200
145CWARNFLAGS+=	-Wno-error=address			\
146		-Wno-error=array-bounds			\
147		-Wno-error=attributes			\
148		-Wno-error=bool-compare			\
149		-Wno-error=cast-align			\
150		-Wno-error=clobbered			\
151		-Wno-error=deprecated-declarations	\
152		-Wno-error=enum-compare			\
153		-Wno-error=extra			\
154		-Wno-error=inline			\
155		-Wno-error=logical-not-parentheses	\
156		-Wno-error=strict-aliasing		\
157		-Wno-error=uninitialized		\
158		-Wno-error=unused-but-set-variable	\
159		-Wno-error=unused-function		\
160		-Wno-error=unused-value
161.endif
162
163# GCC 6.1.0
164.if ${COMPILER_TYPE} == "gcc" && ${COMPILER_VERSION} >= 60100
165CWARNFLAGS+=	-Wno-error=empty-body			\
166		-Wno-error=maybe-uninitialized		\
167		-Wno-error=nonnull-compare		\
168		-Wno-error=shift-negative-value		\
169		-Wno-error=tautological-compare		\
170		-Wno-error=unused-const-variable
171.endif
172
173# GCC 7.1.0
174.if ${COMPILER_TYPE} == "gcc" && ${COMPILER_VERSION} >= 70100
175CWARNFLAGS+=	-Wno-error=bool-operation		\
176		-Wno-error=deprecated			\
177		-Wno-error=expansion-to-defined		\
178		-Wno-error=format-overflow		\
179		-Wno-error=format-truncation		\
180		-Wno-error=implicit-fallthrough		\
181		-Wno-error=int-in-bool-context		\
182		-Wno-error=memset-elt-size		\
183		-Wno-error=noexcept-type		\
184		-Wno-error=nonnull			\
185		-Wno-error=pointer-compare		\
186		-Wno-error=stringop-overflow
187.endif
188
189# GCC 8.1.0
190.if ${COMPILER_TYPE} == "gcc" && ${COMPILER_VERSION} >= 80100
191CWARNFLAGS+=	-Wno-error=aggressive-loop-optimizations	\
192		-Wno-error=cast-function-type			\
193		-Wno-error=catch-value				\
194		-Wno-error=multistatement-macros		\
195		-Wno-error=restrict				\
196		-Wno-error=sizeof-pointer-memaccess		\
197		-Wno-error=stringop-truncation
198.endif
199
200.if ${COMPILER_TYPE} == "gcc"
201# GCC produces false positives for functions that switch on an
202# enum (GCC bug 87950)
203CWARNFLAGS+=	-Wno-return-type
204.endif
205
206# How to handle FreeBSD custom printf format specifiers.
207.if ${COMPILER_TYPE} == "clang" && ${COMPILER_VERSION} >= 30600
208FORMAT_EXTENSIONS=	-D__printf__=__freebsd_kprintf__
209.else
210FORMAT_EXTENSIONS=	-fformat-extensions
211.endif
212
213.if defined(IGNORE_PRAGMA)
214CWARNFLAGS+=	-Wno-unknown-pragmas
215.endif # IGNORE_PRAGMA
216
217# This warning is utter nonsense
218CFLAGS+=	-Wno-format-zero-length
219
220CLANG_OPT_SMALL= -mstack-alignment=8 -mllvm -inline-threshold=3
221.if ${COMPILER_VERSION} < 130000
222CLANG_OPT_SMALL+= -mllvm -simplifycfg-dup-ret
223.endif
224.if ${COMPILER_VERSION} >= 30500 && ${COMPILER_VERSION} < 30700
225CLANG_OPT_SMALL+= -mllvm -enable-gvn=false
226.else
227CLANG_OPT_SMALL+= -mllvm -enable-load-pre=false
228.endif
229CFLAGS.clang+=	 -Qunused-arguments
230.if ${MACHINE_CPUARCH} == "sparc64"
231# Don't emit .cfi directives, since we must use GNU as on sparc64, for now.
232CFLAGS.clang+=	 -fno-dwarf2-cfi-asm
233.endif # SPARC64
234# The libc++ headers use c++11 extensions.  These are normally silenced because
235# they are treated as system headers, but we explicitly disable that warning
236# suppression when building the base system to catch bugs in our headers.
237# Eventually we'll want to start building the base system C++ code as C++11,
238# but not yet.
239CXXFLAGS.clang+=	 -Wno-c++11-extensions
240
241.if ${MK_SSP} != "no" && \
242    ${MACHINE_CPUARCH} != "arm" && ${MACHINE_CPUARCH} != "mips"
243.if (${COMPILER_TYPE} == "clang" && ${COMPILER_VERSION} >= 30500) || \
244    (${COMPILER_TYPE} == "gcc" && \
245     (${COMPILER_VERSION} == 40201 || ${COMPILER_VERSION} >= 40900))
246# Don't use -Wstack-protector as it breaks world with -Werror.
247SSP_CFLAGS?=	-fstack-protector-strong
248.else
249SSP_CFLAGS?=	-fstack-protector
250.endif
251CFLAGS+=	${SSP_CFLAGS}
252.endif # SSP && !ARM && !MIPS
253
254# Additional flags passed in CFLAGS and CXXFLAGS when MK_DEBUG_FILES is
255# enabled.
256DEBUG_FILES_CFLAGS?= -g
257
258# Allow user-specified additional warning flags, plus compiler and file
259# specific flag overrides, unless we've overridden this...
260.if ${MK_WARNS} != "no"
261CFLAGS+=	${CWARNFLAGS:M*} ${CWARNFLAGS.${COMPILER_TYPE}}
262CFLAGS+=	${CWARNFLAGS.${.IMPSRC:T}}
263CXXFLAGS+=	${CXXWARNFLAGS:M*} ${CXXWARNFLAGS.${COMPILER_TYPE}}
264CXXFLAGS+=	${CXXWARNFLAGS.${.IMPSRC:T}}
265.endif
266
267CFLAGS+=	 ${CFLAGS.${COMPILER_TYPE}}
268CXXFLAGS+=	 ${CXXFLAGS.${COMPILER_TYPE}}
269
270AFLAGS+=	${AFLAGS.${.IMPSRC:T}}
271AFLAGS+=	${AFLAGS.${.TARGET:T}}
272ACFLAGS+=	${ACFLAGS.${.IMPSRC:T}}
273ACFLAGS+=	${ACFLAGS.${.TARGET:T}}
274CFLAGS+=	${CFLAGS.${.IMPSRC:T}}
275CXXFLAGS+=	${CXXFLAGS.${.IMPSRC:T}}
276
277LDFLAGS+=	${LDFLAGS.${LINKER_TYPE}}
278
279# Only allow .TARGET when not using PROGS as it has the same syntax
280# per PROG which is ambiguous with this syntax. This is only needed
281# for PROG_VARS vars.
282#
283# Some directories (currently just clang) also need to disable this since
284# CFLAGS.${COMPILER_TYPE}, CFLAGS.${.IMPSRC:T} and CFLAGS.${.TARGET:T} all live
285# in the same namespace, meaning that, for example, GCC builds of clang pick up
286# CFLAGS.clang via CFLAGS.${.TARGET:T} and thus try to pass Clang-specific
287# flags. Ideally the different sources of CFLAGS would be namespaced to avoid
288# collisions.
289.if !defined(_RECURSING_PROGS) && !defined(NO_TARGET_FLAGS)
290.if ${MK_WARNS} != "no"
291CFLAGS+=	${CWARNFLAGS.${.TARGET:T}}
292.endif
293CFLAGS+=	${CFLAGS.${.TARGET:T}}
294CXXFLAGS+=	${CXXFLAGS.${.TARGET:T}}
295LDFLAGS+=	${LDFLAGS.${.TARGET:T}}
296LDADD+=		${LDADD.${.TARGET:T}}
297LIBADD+=	${LIBADD.${.TARGET:T}}
298.endif
299
300.if defined(SRCTOP)
301# Prevent rebuilding during install to support read-only objdirs.
302.if ${.TARGETS:M*install*} == ${.TARGETS} && empty(.MAKE.MODE:Mmeta)
303CFLAGS+=	ERROR-tried-to-rebuild-during-make-install
304.endif
305.endif
306
307# Tell bmake not to mistake standard targets for things to be searched for
308# or expect to ever be up-to-date.
309PHONY_NOTMAIN = analyze afterdepend afterinstall all beforedepend beforeinstall \
310		beforelinking build build-tools buildconfig buildfiles \
311		buildincludes check checkdpadd clean cleandepend cleandir \
312		cleanobj configure depend distclean distribute exe \
313		files html includes install installconfig installdirs \
314		installfiles installincludes lint obj objlink objs objwarn \
315		realinstall tags whereobj
316
317# we don't want ${PROG} to be PHONY
318.PHONY: ${PHONY_NOTMAIN:N${PROG:U}}
319.NOTMAIN: ${PHONY_NOTMAIN:Nall}
320
321.if ${MK_STAGING} != "no"
322.if defined(_SKIP_BUILD) || (!make(all) && !make(clean*) && !make(*clean))
323_SKIP_STAGING?= yes
324.endif
325.if ${_SKIP_STAGING:Uno} == "yes"
326staging stage_libs stage_files stage_as stage_links stage_symlinks:
327.else
328# allow targets like beforeinstall to be leveraged
329DESTDIR= ${STAGE_OBJTOP}
330.export DESTDIR
331
332.if target(beforeinstall)
333.if !empty(_LIBS) || (${MK_STAGING_PROG} != "no" && !defined(INTERNALPROG))
334staging: beforeinstall
335.endif
336.endif
337
338# normally only libs and includes are staged
339.if ${MK_STAGING_PROG} != "no" && !defined(INTERNALPROG)
340STAGE_DIR.prog= ${STAGE_OBJTOP}${BINDIR}
341
342.if !empty(PROG)
343.if defined(PROGNAME)
344STAGE_AS_SETS+= prog
345STAGE_AS_${PROG}= ${PROGNAME}
346stage_as.prog: ${PROG}
347.else
348STAGE_SETS+= prog
349stage_files.prog: ${PROG}
350STAGE_TARGETS+= stage_files
351.endif
352.endif
353.endif
354
355.if !empty(_LIBS) && !defined(INTERNALLIB)
356.if defined(SHLIBDIR) && ${SHLIBDIR} != ${LIBDIR} && ${_LIBS:Uno:M*.so.*} != ""
357STAGE_SETS+= shlib
358STAGE_DIR.shlib= ${STAGE_OBJTOP}${SHLIBDIR}
359STAGE_FILES.shlib+= ${_LIBS:M*.so.*}
360stage_files.shlib: ${_LIBS:M*.so.*}
361.endif
362
363.if defined(SHLIB_LINK) && commands(${SHLIB_LINK:R}.ld)
364STAGE_AS_SETS+= ldscript
365STAGE_AS.ldscript+= ${SHLIB_LINK:R}.ld
366stage_as.ldscript: ${SHLIB_LINK:R}.ld
367STAGE_DIR.ldscript = ${STAGE_LIBDIR}
368STAGE_AS_${SHLIB_LINK:R}.ld:= ${SHLIB_LINK}
369NO_SHLIB_LINKS=
370.endif
371
372.if target(stage_files.shlib)
373stage_libs: ${_LIBS}
374.if defined(DEBUG_FLAGS) && target(${SHLIB_NAME}.symbols)
375stage_files.shlib: ${SHLIB_NAME}.symbols
376.endif
377.else
378stage_libs: ${_LIBS}
379.endif
380.if defined(SHLIB_NAME) && defined(DEBUG_FLAGS) && target(${SHLIB_NAME}.symbols)
381stage_libs: ${SHLIB_NAME}.symbols
382.endif
383
384.endif
385
386.if !empty(INCS) || !empty(INCSGROUPS) && target(buildincludes)
387.if !defined(NO_BEFOREBUILD_INCLUDES)
388stage_includes: buildincludes
389beforebuild: stage_includes
390.endif
391.endif
392
393.for t in stage_libs stage_files stage_as
394.if target($t)
395STAGE_TARGETS+= $t
396.endif
397.endfor
398
399.if !empty(STAGE_AS_SETS)
400STAGE_TARGETS+= stage_as
401.endif
402
403.if !empty(STAGE_TARGETS) || (${MK_STAGING_PROG} != "no" && !defined(INTERNALPROG))
404
405.if !empty(LINKS)
406STAGE_TARGETS+= stage_links
407.if ${MAKE_VERSION} < 20131001
408stage_links.links: ${_LIBS} ${PROG}
409.endif
410STAGE_SETS+= links
411STAGE_LINKS.links= ${LINKS}
412.endif
413
414.if !empty(SYMLINKS)
415STAGE_TARGETS+= stage_symlinks
416STAGE_SETS+= links
417STAGE_SYMLINKS.links= ${SYMLINKS}
418.endif
419
420.endif
421
422.include <meta.stage.mk>
423.endif
424.endif
425
426.if defined(META_TARGETS)
427.for _tgt in ${META_TARGETS}
428.if target(${_tgt})
429${_tgt}: ${META_DEPS}
430.endif
431.endfor
432.endif
433