share/mk/bsd.sys.mk

   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
  15 CSTD?=          gnu99
  16
  17 .if ${CSTD} == "c89" || ${CSTD} == "c90"
  18 CFLAGS+=        -std=iso9899:1990
  19 .elif ${CSTD} == "c94" || ${CSTD} == "c95"
  20 CFLAGS+=        -std=iso9899:199409
  21 .elif ${CSTD} == "c99"
  22 CFLAGS+=        -std=iso9899:1999
  23 .else # CSTD
  24 CFLAGS+=        -std=${CSTD}
  25 .endif # CSTD
  26
  27 .if !empty(CXXSTD)
  28 CXXFLAGS+=      -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)
  36 WARNS=  ${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
  43 CWARNFLAGS+=    -Wsystem-headers
  44 .if ${MK_WERROR} != "no" && ${MK_WERROR.${COMPILER_TYPE}:Uyes} != "no"
  45 CWARNFLAGS+=    -Werror
  46 .endif # ${MK_WERROR} != "no" && ${MK_WERROR.${COMPILER_TYPE}:Uyes} != "no"
  47 .endif # WARNS >= 1
  48 .if ${WARNS} >= 2
  49 CWARNFLAGS+=    -Wall -Wno-format-y2k
  50 .endif # WARNS >= 2
  51 .if ${WARNS} >= 3
  52 CWARNFLAGS+=    -W -Wno-unused-parameter -Wstrict-prototypes\
  53                 -Wmissing-prototypes -Wpointer-arith
  54 .endif # WARNS >= 3
  55 .if ${WARNS} >= 4
  56 CWARNFLAGS+=    -Wreturn-type -Wcast-qual -Wwrite-strings -Wswitch -Wshadow\
  57                 -Wunused-parameter
  58 .if !defined(NO_WCAST_ALIGN) && !defined(NO_WCAST_ALIGN.${COMPILER_TYPE})
  59 CWARNFLAGS+=    -Wcast-align
  60 .endif # !NO_WCAST_ALIGN !NO_WCAST_ALIGN.${COMPILER_TYPE}
  61 .endif # WARNS >= 4
  62 .if ${WARNS} >= 6
  63 CWARNFLAGS+=    -Wchar-subscripts -Wnested-externs -Wredundant-decls\
  64                 -Wold-style-definition
  65 .if !defined(NO_WMISSING_VARIABLE_DECLARATIONS)
  66 CWARNFLAGS.clang+=      -Wmissing-variable-declarations
  67 .endif
  68 .if !defined(NO_WTHREAD_SAFETY)
  69 CWARNFLAGS.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.
  75 CWARNFLAGS+=    -Wno-uninitialized
  76 .endif # WARNS >=2 && WARNS <= 4
  77 CWARNFLAGS+=    -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
  81 CWARNFLAGS.clang+=      -Wno-empty-body -Wno-string-plus-int
  82 CWARNFLAGS.clang+=      -Wno-unused-const-variable
  83 .endif # WARNS <= 6
  84 .if ${WARNS} <= 3
  85 CWARNFLAGS.clang+=      -Wno-tautological-compare -Wno-unused-value\
  86                 -Wno-parentheses-equality -Wno-unused-function -Wno-enum-conversion
  87 CWARNFLAGS.clang+=      -Wno-unused-local-typedef
  88 CWARNFLAGS.clang+=      -Wno-address-of-packed-member
  89 .if ${COMPILER_TYPE} == "gcc" && ${COMPILER_VERSION} >= 90100
  90 CWARNFLAGS.gcc+=        -Wno-address-of-packed-member
  91 .endif
  92 .if ${COMPILER_TYPE} == "clang" && ${COMPILER_VERSION} >= 70000 && \
  93     ${MACHINE_CPUARCH} == "arm" && !${MACHINE_ARCH:Marmv[67]*}
  94 CWARNFLAGS.clang+=      -Wno-atomic-alignment
  95 .endif
  96 .endif # WARNS <= 3
  97 .if ${WARNS} <= 2
  98 CWARNFLAGS.clang+=      -Wno-switch -Wno-switch-enum -Wno-knr-promoted-parameter
  99 .endif # WARNS <= 2
 100 .if ${WARNS} <= 1
 101 CWARNFLAGS.clang+=      -Wno-parentheses
 102 .endif # WARNS <= 1
 103 .if defined(NO_WARRAY_BOUNDS)
 104 CWARNFLAGS.clang+=      -Wno-array-bounds
 105 .endif # NO_WARRAY_BOUNDS
 106 .if defined(NO_WMISLEADING_INDENTATION) && \
 107     ((${COMPILER_TYPE} == "clang" && ${COMPILER_VERSION} >= 100000) || \
 108       ${COMPILER_TYPE} == "gcc")
 109 CWARNFLAGS+=            -Wno-misleading-indentation
 110 .endif # NO_WMISLEADING_INDENTATION
 111 .endif # WARNS
 112
 113 .if defined(FORMAT_AUDIT)
 114 WFORMAT=        1
 115 .endif # FORMAT_AUDIT
 116 .if defined(WFORMAT)
 117 .if ${WFORMAT} > 0
 118 #CWARNFLAGS+=   -Wformat-nonliteral -Wformat-security -Wno-format-extra-args
 119 CWARNFLAGS+=    -Wformat=2 -Wno-format-extra-args
 120 .if ${WARNS} <= 3
 121 CWARNFLAGS.clang+=      -Wno-format-nonliteral
 122 .endif # WARNS <= 3
 123 .if ${MK_WERROR} != "no" && ${MK_WERROR.${COMPILER_TYPE}:Uyes} != "no"
 124 CWARNFLAGS+=    -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.${COMPILER_TYPE})
 129 CWARNFLAGS+=    -Wno-format
 130 .endif # NO_WFORMAT || NO_WFORMAT.${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
 141 CWARNFLAGS+=    -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
 160 CWARNFLAGS+=    -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
 171 CWARNFLAGS+=    -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
 187 CWARNFLAGS+=    -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"
 198 CWARNFLAGS+=    -Wno-system-headers
 199 .endif
 200 .endif  # gcc
 201
 202 # How to handle FreeBSD custom printf format specifiers.
 203 .if ${COMPILER_TYPE} == "clang"
 204 FORMAT_EXTENSIONS=      -D__printf__=__freebsd_kprintf__
 205 .else
 206 FORMAT_EXTENSIONS=      -fformat-extensions
 207 .endif
 208
 209 .if defined(IGNORE_PRAGMA)
 210 CWARNFLAGS+=    -Wno-unknown-pragmas
 211 .endif # IGNORE_PRAGMA
 212
 213 # This warning is utter nonsense
 214 CFLAGS+=        -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)
 227 CFLAGS+=-nobuiltininc -idirafter ${COMPILER_RESOURCE_DIR}/include
 228 .endif
 229 .endif
 230
 231 CLANG_OPT_SMALL= -mstack-alignment=8 -mllvm -inline-threshold=3
 232 .if ${COMPILER_VERSION} < 130000
 233 CLANG_OPT_SMALL+= -mllvm -simplifycfg-dup-ret
 234 .endif
 235 CLANG_OPT_SMALL+= -mllvm -enable-load-pre=false
 236 CFLAGS.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.
 242 CXXFLAGS.clang+=         -Wno-c++11-extensions
 243
 244 .if ${MK_SSP} != "no"
 245 # Don't use -Wstack-protector as it breaks world with -Werror.
 246 SSP_CFLAGS?=    -fstack-protector-strong
 247 CFLAGS+=        ${SSP_CFLAGS}
 248 .endif # SSP
 249
 250 # Additional flags passed in CFLAGS and CXXFLAGS when MK_DEBUG_FILES is
 251 # enabled.
 252 DEBUG_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"
 257 CFLAGS+=        ${CWARNFLAGS:M*} ${CWARNFLAGS.${COMPILER_TYPE}}
 258 CFLAGS+=        ${CWARNFLAGS.${.IMPSRC:T}}
 259 CXXFLAGS+=      ${CXXWARNFLAGS:M*} ${CXXWARNFLAGS.${COMPILER_TYPE}}
 260 CXXFLAGS+=      ${CXXWARNFLAGS.${.IMPSRC:T}}
 261 .endif
 262
 263 CFLAGS+=         ${CFLAGS.${COMPILER_TYPE}}
 264 CXXFLAGS+=       ${CXXFLAGS.${COMPILER_TYPE}}
 265
 266 AFLAGS+=        ${AFLAGS.${.IMPSRC:T}}
 267 AFLAGS+=        ${AFLAGS.${.TARGET:T}}
 268 ACFLAGS+=       ${ACFLAGS.${.IMPSRC:T}}
 269 ACFLAGS+=       ${ACFLAGS.${.TARGET:T}}
 270 CFLAGS+=        ${CFLAGS.${.IMPSRC:T}}
 271 CXXFLAGS+=      ${CXXFLAGS.${.IMPSRC:T}}
 272
 273 LDFLAGS+=       ${LDFLAGS.${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"
 287 CFLAGS+=        ${CWARNFLAGS.${.TARGET:T}}
 288 .endif
 289 CFLAGS+=        ${CFLAGS.${.TARGET:T}}
 290 CXXFLAGS+=      ${CXXFLAGS.${.TARGET:T}}
 291 LDFLAGS+=       ${LDFLAGS.${.TARGET:T}}
 292 LDADD+=         ${LDADD.${.TARGET:T}}
 293 LIBADD+=        ${LIBADD.${.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)
 299 CFLAGS+=        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 ${COMPILER_VERSION} >= 120000
 309 LDFLAGS+=       --ld-path=${LD:[1]:S/^ld.//1W}
 310 .else
 311 LDFLAGS+=       -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.
 326 PHONY_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"
 343 staging stage_libs stage_files stage_as stage_links stage_symlinks:
 344 .else
 345 # allow targets like beforeinstall to be leveraged
 346 DESTDIR= ${STAGE_OBJTOP}
 347 .export DESTDIR
 348
 349 .if target(beforeinstall)
 350 .if !empty(_LIBS) || (${MK_STAGING_PROG} != "no" && !defined(INTERNALPROG))
 351 staging: beforeinstall
 352 .endif
 353 .endif
 354
 355 # normally only libs and includes are staged
 356 .if ${MK_STAGING_PROG} != "no" && !defined(INTERNALPROG)
 357 STAGE_DIR.prog= ${STAGE_OBJTOP}${BINDIR}
 358
 359 .if !empty(PROG)
 360 .if defined(PROGNAME)
 361 STAGE_AS_SETS+= prog
 362 STAGE_AS_${PROG}= ${PROGNAME}
 363 stage_as.prog: ${PROG}
 364 .else
 365 STAGE_SETS+= prog
 366 stage_files.prog: ${PROG}
 367 STAGE_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.*} != ""
 374 STAGE_SETS+= shlib
 375 STAGE_DIR.shlib= ${STAGE_OBJTOP}${SHLIBDIR}
 376 STAGE_FILES.shlib+= ${_LIBS:M*.so.*}
 377 stage_files.shlib: ${_LIBS:M*.so.*}
 378 .endif
 379
 380 .if defined(SHLIB_LINK) && commands(${SHLIB_LINK:R}.ld)
 381 STAGE_AS_SETS+= ldscript
 382 STAGE_AS.ldscript+= ${SHLIB_LINK:R}.ld
 383 stage_as.ldscript: ${SHLIB_LINK:R}.ld
 384 STAGE_DIR.ldscript = ${STAGE_LIBDIR}
 385 STAGE_AS_${SHLIB_LINK:R}.ld:= ${SHLIB_LINK}
 386 NO_SHLIB_LINKS=
 387 .endif
 388
 389 .if target(stage_files.shlib)
 390 stage_libs: ${_LIBS}
 391 .if defined(DEBUG_FLAGS) && target(${SHLIB_NAME}.symbols)
 392 stage_files.shlib: ${SHLIB_NAME}.symbols
 393 .endif
 394 .else
 395 stage_libs: ${_LIBS}
 396 .endif
 397 .if defined(SHLIB_NAME) && defined(DEBUG_FLAGS) && target(${SHLIB_NAME}.symbols)
 398 stage_libs: ${SHLIB_NAME}.symbols
 399 .endif
 400
 401 .endif
 402
 403 .if !empty(INCS) || !empty(INCSGROUPS) && target(buildincludes)
 404 .if !defined(NO_BEFOREBUILD_INCLUDES)
 405 stage_includes: buildincludes
 406 beforebuild: stage_includes
 407 .endif
 408 .endif
 409
 410 .for t in stage_libs stage_files stage_as
 411 .if target($t)
 412 STAGE_TARGETS+= $t
 413 .endif
 414 .endfor
 415
 416 .if !empty(STAGE_AS_SETS)
 417 STAGE_TARGETS+= stage_as
 418 .endif
 419
 420 .if !empty(STAGE_TARGETS) || (${MK_STAGING_PROG} != "no" && !defined(INTERNALPROG))
 421
 422 .if !empty(LINKS)
 423 STAGE_TARGETS+= stage_links
 424 .if ${MAKE_VERSION} < 20131001
 425 stage_links.links: ${_LIBS} ${PROG}
 426 .endif
 427 STAGE_SETS+= links
 428 STAGE_LINKS.links= ${LINKS}
 429 .endif
 430
 431 .if !empty(SYMLINKS)
 432 STAGE_TARGETS+= stage_symlinks
 433 STAGE_SETS+= links
 434 STAGE_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