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 \
  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 .if ${COMPILER_TYPE} == "clang" && ${COMPILER_VERSION} >= 130000
  84 CWARNFLAGS.clang+=      -Wno-error=unused-but-set-variable
  85 .endif
  86 .endif # WARNS <= 6
  87 .if ${WARNS} <= 3
  88 CWARNFLAGS.clang+=      -Wno-tautological-compare -Wno-unused-value\
  89                 -Wno-parentheses-equality -Wno-unused-function -Wno-enum-conversion
  90 CWARNFLAGS.clang+=      -Wno-unused-local-typedef
  91 CWARNFLAGS.clang+=      -Wno-address-of-packed-member
  92 .if ${COMPILER_TYPE} == "gcc" && ${COMPILER_VERSION} >= 90100
  93 CWARNFLAGS.gcc+=        -Wno-address-of-packed-member
  94 .endif
  95 .if ${COMPILER_TYPE} == "clang" && ${COMPILER_VERSION} >= 70000 && \
  96     ${MACHINE_CPUARCH} == "arm" && !${MACHINE_ARCH:Marmv[67]*}
  97 CWARNFLAGS.clang+=      -Wno-atomic-alignment
  98 .endif
  99 .endif # WARNS <= 3
 100 .if ${WARNS} <= 2
 101 CWARNFLAGS.clang+=      -Wno-switch -Wno-switch-enum -Wno-knr-promoted-parameter
 102 .endif # WARNS <= 2
 103 .if ${WARNS} <= 1
 104 CWARNFLAGS.clang+=      -Wno-parentheses
 105 .endif # WARNS <= 1
 106 .if defined(NO_WARRAY_BOUNDS)
 107 CWARNFLAGS.clang+=      -Wno-array-bounds
 108 .endif # NO_WARRAY_BOUNDS
 109 .if defined(NO_WMISLEADING_INDENTATION) && \
 110     ((${COMPILER_TYPE} == "clang" && ${COMPILER_VERSION} >= 100000) || \
 111       ${COMPILER_TYPE} == "gcc")
 112 CWARNFLAGS+=            -Wno-misleading-indentation
 113 .endif # NO_WMISLEADING_INDENTATION
 114 .if ${COMPILER_TYPE} == "clang" && ${COMPILER_VERSION} >= 140000
 115 NO_WBITWISE_INSTEAD_OF_LOGICAL= -Wno-bitwise-instead-of-logical
 116 .endif
 117 .endif # WARNS
 118
 119 .if defined(FORMAT_AUDIT)
 120 WFORMAT=        1
 121 .endif # FORMAT_AUDIT
 122 .if defined(WFORMAT)
 123 .if ${WFORMAT} > 0
 124 #CWARNFLAGS+=   -Wformat-nonliteral -Wformat-security -Wno-format-extra-args
 125 CWARNFLAGS+=    -Wformat=2 -Wno-format-extra-args
 126 .if ${WARNS} <= 3
 127 CWARNFLAGS.clang+=      -Wno-format-nonliteral
 128 .endif # WARNS <= 3
 129 .if ${MK_WERROR} != "no" && ${MK_WERROR.${COMPILER_TYPE}:Uyes} != "no"
 130 CWARNFLAGS+=    -Werror
 131 .endif # ${MK_WERROR} != "no" && ${MK_WERROR.${COMPILER_TYPE}:Uyes} != "no"
 132 .endif # WFORMAT > 0
 133 .endif # WFORMAT
 134 .if defined(NO_WFORMAT) || defined(NO_WFORMAT.${COMPILER_TYPE})
 135 CWARNFLAGS+=    -Wno-format
 136 .endif # NO_WFORMAT || NO_WFORMAT.${COMPILER_TYPE}
 137
 138 # GCC
 139 # We should clean up warnings produced with these flags.
 140 # They were originally added as a quick hack to enable gcc5/6.
 141 # The base system requires at least GCC 6.4, but some ports
 142 # use this file with older compilers.  Request an exprun
 143 # before changing these.
 144 .if ${COMPILER_TYPE} == "gcc"
 145 # GCC 5.2.0
 146 .if ${COMPILER_VERSION} >= 50200
 147 CWARNFLAGS+=    -Wno-error=address                      \
 148                 -Wno-error=array-bounds                 \
 149                 -Wno-error=attributes                   \
 150                 -Wno-error=bool-compare                 \
 151                 -Wno-error=cast-align                   \
 152                 -Wno-error=clobbered                    \
 153                 -Wno-error=deprecated-declarations      \
 154                 -Wno-error=enum-compare                 \
 155                 -Wno-error=extra                        \
 156                 -Wno-error=logical-not-parentheses      \
 157                 -Wno-error=strict-aliasing              \
 158                 -Wno-error=uninitialized                \
 159                 -Wno-error=unused-but-set-variable      \
 160                 -Wno-error=unused-function              \
 161                 -Wno-error=unused-value
 162 .endif
 163
 164 # GCC 6.1.0
 165 .if ${COMPILER_VERSION} >= 60100
 166 CWARNFLAGS+=    -Wno-error=empty-body                   \
 167                 -Wno-error=maybe-uninitialized          \
 168                 -Wno-error=nonnull-compare              \
 169                 -Wno-error=shift-negative-value         \
 170                 -Wno-error=tautological-compare         \
 171                 -Wno-error=unused-const-variable
 172 .endif
 173
 174 # GCC 7.1.0
 175 .if ${COMPILER_VERSION} >= 70100
 176 CWARNFLAGS+=    -Wno-error=bool-operation               \
 177                 -Wno-error=deprecated                   \
 178                 -Wno-error=expansion-to-defined         \
 179                 -Wno-error=format-overflow              \
 180                 -Wno-error=format-truncation            \
 181                 -Wno-error=implicit-fallthrough         \
 182                 -Wno-error=int-in-bool-context          \
 183                 -Wno-error=memset-elt-size              \
 184                 -Wno-error=noexcept-type                \
 185                 -Wno-error=nonnull                      \
 186                 -Wno-error=pointer-compare              \
 187                 -Wno-error=stringop-overflow
 188 .endif
 189
 190 # GCC 8.1.0
 191 .if ${COMPILER_VERSION} >= 80100
 192 CWARNFLAGS+=    -Wno-error=aggressive-loop-optimizations        \
 193                 -Wno-error=cast-function-type                   \
 194                 -Wno-error=catch-value                          \
 195                 -Wno-error=multistatement-macros                \
 196                 -Wno-error=restrict                             \
 197                 -Wno-error=sizeof-pointer-memaccess             \
 198                 -Wno-error=stringop-truncation
 199 .endif
 200
 201 # GCC 9.2.0
 202 .if ${COMPILER_VERSION} >= 90200
 203 .if ${MACHINE_ARCH} == "i386"
 204 CWARNFLAGS+=    -Wno-error=overflow
 205 .endif
 206 .endif
 207
 208 # GCC produces false positives for functions that switch on an
 209 # enum (GCC bug 87950)
 210 CWARNFLAGS+=    -Wno-return-type
 211
 212 # GCC's own arm_neon.h triggers various warnings
 213 .if ${MACHINE_CPUARCH} == "aarch64"
 214 CWARNFLAGS+=    -Wno-system-headers
 215 .endif
 216 .endif  # gcc
 217
 218 # How to handle FreeBSD custom printf format specifiers.
 219 .if ${COMPILER_TYPE} == "clang"
 220 FORMAT_EXTENSIONS=      -D__printf__=__freebsd_kprintf__
 221 .else
 222 FORMAT_EXTENSIONS=      -fformat-extensions
 223 .endif
 224
 225 .if defined(IGNORE_PRAGMA)
 226 CWARNFLAGS+=    -Wno-unknown-pragmas
 227 .endif # IGNORE_PRAGMA
 228
 229 # This warning is utter nonsense
 230 CFLAGS+=        -Wno-format-zero-length
 231
 232 .if ${COMPILER_TYPE} == "clang"
 233 # The headers provided by clang are incompatible with the FreeBSD headers.
 234 # If the version of clang is not one that has been patched to omit the
 235 # incompatible headers, we need to compile with -nobuiltininc and add the
 236 # resource dir to the end of the search paths. This ensures that headers such as
 237 # immintrin.h are still found but stddef.h, etc. are picked up from FreeBSD.
 238 #
 239 # XXX: This is a hack to support complete external installs of clang while
 240 # we work to synchronize our decleration guards with those in the clang tree.
 241 .if ${MK_CLANG_BOOTSTRAP:Uno} == "no" && \
 242     ${COMPILER_RESOURCE_DIR} != "unknown" && !defined(BOOTSTRAPPING)
 243 CFLAGS+=-nobuiltininc -idirafter ${COMPILER_RESOURCE_DIR}/include
 244 .endif
 245 .endif
 246
 247 CLANG_OPT_SMALL= -mstack-alignment=8 -mllvm -inline-threshold=3
 248 .if ${COMPILER_VERSION} < 130000
 249 CLANG_OPT_SMALL+= -mllvm -simplifycfg-dup-ret
 250 .endif
 251 CLANG_OPT_SMALL+= -mllvm -enable-load-pre=false
 252 CFLAGS.clang+=   -Qunused-arguments
 253 # The libc++ headers use c++11 extensions.  These are normally silenced because
 254 # they are treated as system headers, but we explicitly disable that warning
 255 # suppression when building the base system to catch bugs in our headers.
 256 # Eventually we'll want to start building the base system C++ code as C++11,
 257 # but not yet.
 258 CXXFLAGS.clang+=         -Wno-c++11-extensions
 259
 260 .if ${MK_SSP} != "no"
 261 # Don't use -Wstack-protector as it breaks world with -Werror.
 262 SSP_CFLAGS?=    -fstack-protector-strong
 263 CFLAGS+=        ${SSP_CFLAGS}
 264 .endif # SSP
 265
 266 # Additional flags passed in CFLAGS and CXXFLAGS when MK_DEBUG_FILES is
 267 # enabled.
 268 DEBUG_FILES_CFLAGS?= -g -gz=zlib
 269
 270 # Allow user-specified additional warning flags, plus compiler and file
 271 # specific flag overrides, unless we've overridden this...
 272 .if ${MK_WARNS} != "no"
 273 CFLAGS+=        ${CWARNFLAGS:M*} ${CWARNFLAGS.${COMPILER_TYPE}}
 274 CFLAGS+=        ${CWARNFLAGS.${.IMPSRC:T}}
 275 CXXFLAGS+=      ${CXXWARNFLAGS:M*} ${CXXWARNFLAGS.${COMPILER_TYPE}}
 276 CXXFLAGS+=      ${CXXWARNFLAGS.${.IMPSRC:T}}
 277 .endif
 278
 279 CFLAGS+=         ${CFLAGS.${COMPILER_TYPE}}
 280 CXXFLAGS+=       ${CXXFLAGS.${COMPILER_TYPE}}
 281
 282 AFLAGS+=        ${AFLAGS.${.IMPSRC:T}}
 283 AFLAGS+=        ${AFLAGS.${.TARGET:T}}
 284 ACFLAGS+=       ${ACFLAGS.${.IMPSRC:T}}
 285 ACFLAGS+=       ${ACFLAGS.${.TARGET:T}}
 286 CFLAGS+=        ${CFLAGS.${.IMPSRC:T}}
 287 CXXFLAGS+=      ${CXXFLAGS.${.IMPSRC:T}}
 288
 289 LDFLAGS+=       ${LDFLAGS.${LINKER_TYPE}}
 290
 291 # Only allow .TARGET when not using PROGS as it has the same syntax
 292 # per PROG which is ambiguous with this syntax. This is only needed
 293 # for PROG_VARS vars.
 294 #
 295 # Some directories (currently just clang) also need to disable this since
 296 # CFLAGS.${COMPILER_TYPE}, CFLAGS.${.IMPSRC:T} and CFLAGS.${.TARGET:T} all live
 297 # in the same namespace, meaning that, for example, GCC builds of clang pick up
 298 # CFLAGS.clang via CFLAGS.${.TARGET:T} and thus try to pass Clang-specific
 299 # flags. Ideally the different sources of CFLAGS would be namespaced to avoid
 300 # collisions.
 301 .if !defined(_RECURSING_PROGS) && !defined(NO_TARGET_FLAGS)
 302 .if ${MK_WARNS} != "no"
 303 CFLAGS+=        ${CWARNFLAGS.${.TARGET:T}}
 304 .endif
 305 CFLAGS+=        ${CFLAGS.${.TARGET:T}}
 306 CXXFLAGS+=      ${CXXFLAGS.${.TARGET:T}}
 307 LDFLAGS+=       ${LDFLAGS.${.TARGET:T}}
 308 LDADD+=         ${LDADD.${.TARGET:T}}
 309 LIBADD+=        ${LIBADD.${.TARGET:T}}
 310 .endif
 311
 312 .if defined(SRCTOP)
 313 # Prevent rebuilding during install to support read-only objdirs.
 314 .if ${.TARGETS:M*install*} == ${.TARGETS} && empty(.MAKE.MODE:Mmeta)
 315 CFLAGS+=        ERROR-tried-to-rebuild-during-make-install
 316 .endif
 317 .endif
 318
 319 # Please keep this if in sync with kern.mk
 320 .if ${LD} != "ld" && (${CC:[1]:H} != ${LD:[1]:H} || ${LD:[1]:T} != "ld")
 321 # Add -fuse-ld=${LD} if $LD is in a different directory or not called "ld".
 322 .if ${COMPILER_TYPE} == "clang"
 323 # Note: Clang does not like relative paths for ld so we map ld.lld -> lld.
 324 .if ${COMPILER_VERSION} >= 120000
 325 LDFLAGS+=       --ld-path=${LD:[1]:S/^ld.//1W}
 326 .else
 327 LDFLAGS+=       -fuse-ld=${LD:[1]:S/^ld.//1W}
 328 .endif
 329 .elif ${COMPILER_TYPE} == "gcc"
 330 # GCC does not support an absolute path for -fuse-ld so we just print this
 331 # warning instead and let the user add the required symlinks.
 332 # However, we can avoid this warning if -B is set appropriately (e.g. for
 333 # CROSS_TOOLCHAIN=...-gcc).
 334 .if !(${LD:[1]:T} == "ld" && ${CC:tw:M-B${LD:[1]:H}/})
 335 .warning LD (${LD}) is not the default linker for ${CC} but -fuse-ld= is not supported
 336 .endif
 337 .endif
 338 .endif
 339
 340 # Tell bmake not to mistake standard targets for things to be searched for
 341 # or expect to ever be up-to-date.
 342 PHONY_NOTMAIN = analyze afterdepend afterinstall all beforedepend beforeinstall \
 343                 beforelinking build build-tools buildconfig buildfiles \
 344                 buildincludes check checkdpadd clean cleandepend cleandir \
 345                 cleanobj configure depend distclean distribute exe \
 346                 files html includes install installconfig installdirs \
 347                 installfiles installincludes lint obj objlink objs objwarn \
 348                 realinstall tags whereobj
 349
 350 # we don't want ${PROG} to be PHONY
 351 .PHONY: ${PHONY_NOTMAIN:N${PROG:U}}
 352 .NOTMAIN: ${PHONY_NOTMAIN:Nall}
 353
 354 .if ${MK_STAGING} != "no"
 355 .if defined(_SKIP_BUILD) || (!make(all) && !make(clean*) && !make(*clean))
 356 _SKIP_STAGING?= yes
 357 .endif
 358 .if ${_SKIP_STAGING:Uno} == "yes"
 359 staging stage_libs stage_files stage_as stage_links stage_symlinks:
 360 .else
 361 # allow targets like beforeinstall to be leveraged
 362 DESTDIR= ${STAGE_OBJTOP}
 363 .export DESTDIR
 364
 365 .if target(beforeinstall)
 366 .if !empty(_LIBS) || (${MK_STAGING_PROG} != "no" && !defined(INTERNALPROG))
 367 staging: beforeinstall
 368 .endif
 369 .endif
 370
 371 # normally only libs and includes are staged
 372 .if ${MK_STAGING_PROG} != "no" && !defined(INTERNALPROG)
 373 STAGE_DIR.prog= ${STAGE_OBJTOP}${BINDIR}
 374
 375 .if !empty(PROG)
 376 .if defined(PROGNAME)
 377 STAGE_AS_SETS+= prog
 378 STAGE_AS_${PROG}= ${PROGNAME}
 379 stage_as.prog: ${PROG}
 380 .else
 381 STAGE_SETS+= prog
 382 stage_files.prog: ${PROG}
 383 STAGE_TARGETS+= stage_files
 384 .endif
 385 .endif
 386 .endif
 387
 388 .if !empty(_LIBS) && !defined(INTERNALLIB)
 389 .if defined(SHLIBDIR) && ${SHLIBDIR} != ${LIBDIR} && ${_LIBS:Uno:M*.so.*} != ""
 390 STAGE_SETS+= shlib
 391 STAGE_DIR.shlib= ${STAGE_OBJTOP}${SHLIBDIR}
 392 STAGE_FILES.shlib+= ${_LIBS:M*.so.*}
 393 stage_files.shlib: ${_LIBS:M*.so.*}
 394 .endif
 395
 396 .if defined(SHLIB_LINK) && commands(${SHLIB_LINK:R}.ld)
 397 STAGE_AS_SETS+= ldscript
 398 STAGE_AS.ldscript+= ${SHLIB_LINK:R}.ld
 399 stage_as.ldscript: ${SHLIB_LINK:R}.ld
 400 STAGE_DIR.ldscript = ${STAGE_LIBDIR}
 401 STAGE_AS_${SHLIB_LINK:R}.ld:= ${SHLIB_LINK}
 402 NO_SHLIB_LINKS=
 403 .endif
 404
 405 .if target(stage_files.shlib)
 406 stage_libs: ${_LIBS}
 407 .if defined(DEBUG_FLAGS) && target(${SHLIB_NAME}.symbols)
 408 stage_files.shlib: ${SHLIB_NAME}.symbols
 409 .endif
 410 .else
 411 stage_libs: ${_LIBS}
 412 .endif
 413 .if defined(SHLIB_NAME) && defined(DEBUG_FLAGS) && target(${SHLIB_NAME}.symbols)
 414 stage_libs: ${SHLIB_NAME}.symbols
 415 .endif
 416
 417 .endif
 418
 419 .if !empty(INCS) || !empty(INCSGROUPS) && target(buildincludes)
 420 .if !defined(NO_BEFOREBUILD_INCLUDES)
 421 stage_includes: buildincludes
 422 beforebuild: stage_includes
 423 .endif
 424 .endif
 425
 426 .for t in stage_libs stage_files stage_as
 427 .if target($t)
 428 STAGE_TARGETS+= $t
 429 .endif
 430 .endfor
 431
 432 .if !empty(STAGE_AS_SETS)
 433 STAGE_TARGETS+= stage_as
 434 .endif
 435
 436 .if !empty(STAGE_TARGETS) || (${MK_STAGING_PROG} != "no" && !defined(INTERNALPROG))
 437
 438 .if !empty(LINKS)
 439 STAGE_TARGETS+= stage_links
 440 .if ${MAKE_VERSION} < 20131001
 441 stage_links.links: ${_LIBS} ${PROG}
 442 .endif
 443 STAGE_SETS+= links
 444 STAGE_LINKS.links= ${LINKS}
 445 .endif
 446
 447 .if !empty(SYMLINKS)
 448 STAGE_TARGETS+= stage_symlinks
 449 STAGE_SETS+= links
 450 STAGE_SYMLINKS.links= ${SYMLINKS}
 451 .endif
 452
 453 .endif
 454
 455 .include <meta.stage.mk>
 456 .endif
 457 .endif
 458
 459 .if defined(META_TARGETS)
 460 .for _tgt in ${META_TARGETS}
 461 .if target(${_tgt})
 462 ${_tgt}: ${META_DEPS}
 463 .endif
 464 .endfor
 465 .endif