BUILDING revision 1.31
1 BUILDING(8) NetBSD System Manager's Manual BUILDING(8) 2 3 NAME 4 BUILDING - Procedure for building NetBSD from source code. 5 6 STATUS 7 This document is a work-in-progress. As such, the information described 8 here may not match the reality of the build system as of this writing. 9 Once this document is completely in sync with reality, this paragraph 10 will be removed. 11 12 Discrepancies between this documentation and the current reality of im- 13 plementation are noted specially, as with the note below: 14 15 Note: This document applies only to platforms which use the new toolchain 16 as indicated by the default setting of TOOLCHAIN_MISSING in <bsd.own.mk>. 17 Platforms which have not yet been switched to the new toolchain should 18 continue building traditionally, using the notes specified in the file 19 UPDATING. 20 21 REQUIREMENTS 22 NetBSD is designed to be buildable on most POSIX-compliant host systems. 23 The basic build procedure is the same whether compiling natively (on the 24 same NetBSD architecture) or cross compiling (on another architecture or 25 OS). 26 27 This source tree contains a special subtree, ``tools'', which uses the 28 host system to create a build toolchain for the target architecture. The 29 host system must have at least C and C++ compilers in order to create the 30 toolchain (make is not required); all other tools are created as part of 31 the NetBSD build process. 32 33 Note: A couple of host toolchain components are not yet available 34 in the tools directory. Also, some tools use non-POSIX, non-ANSI C 35 extensions and need to be standardized. As a result, cross-compil- 36 ing from systems other than NetBSD is not currently supported. 37 38 FILES 39 Source tree layout 40 41 doc/BUILDING.mdoc 42 This document (in -mdoc troff format; the original copy). 43 44 BUILDING This document (in plaintext). 45 46 Makefile The main Makefile for NetBSD; should only be run for na- 47 tive builds with an appropriately up-to-date version of 48 NetBSD make(1). (For building from out-of-date systems or 49 on a non-native host, see the build.sh shell script.) 50 51 UPDATING Special notes for updating from an earlier revision of 52 NetBSD. It is important to read this file before every 53 build of an updated source tree. 54 55 build.sh Bourne-compatible shell script used for building the host 56 build tools and the NetBSD system from scratch. Can be 57 used for both native and cross builds, and should be used 58 instead of make(1) for any source tree that is updated and 59 recompiled regularly. 60 61 crypto/dist/, dist/, gnu/dist/ 62 Sources imported verbatim from third parties, without man- 63 gling the existing build structure. Other source trees in 64 bin through usr.sbin use the NetBSD make(1) ``reachover'' 65 Makefile semantics when building these programs for a na- 66 tive host. 67 68 distrib/, etc/ 69 Sources for items used when making a full release snap- 70 shot, such as files installed in DESTDIR/etc on the desti- 71 nation system, boot media, and release notes. 72 73 regress/ Regression test harness. Can be cross-compiled, but only 74 run natively. 75 76 sys/ NetBSD kernel sources. 77 78 tools/ ``Reachover'' build structure for the host build tools. 79 This has a special method of determining out-of-date sta- 80 tus. 81 82 bin/ ... usr.sbin/ 83 Sources to the NetBSD userland (non-kernel) programs. If 84 any of these directories are missing, they will be skipped 85 during the build. 86 87 Build tree layout 88 The NetBSD build tree is described in hier(7), and the release layout is 89 described in release(7). 90 91 CONFIGURATION 92 Environment variables 93 Several environment variables control the behaviour of NetBSD builds. 94 95 MACHINE Machine type. 96 97 MACHINE_ARCH Machine architecture. 98 99 MAKE Path name to invoke make(1) as. 100 101 MAKEFLAGS Flags to invoke make(1) with. 102 103 MAKEOBJDIR Directory to use as the .OBJDIR for the current direc- 104 tory. Used only if MAKEOBJDIRPREFIX is not defined. 105 MAKEOBJDIR can only be provided in the environment. 106 107 MAKEOBJDIRPREFIX Top level directory of the object directory tree. If 108 this is defined, ${MAKEOBJDIRPREFIX}/${.CURDIR} is used 109 as the .OBJDIR for the current directory. The current 110 directory may be read only. MAKEOBJDIRPREFIX can only 111 be provided in the environment. 112 113 "make" variables 114 Several variables control the behavior of NetBSD builds. Unless other- 115 wise specified, these variables may be set in either the process environ- 116 ment or the make(1) configuration file specified by MAKECONF. 117 118 BUILDID Identifier for the build. The identifier will be appended to 119 object directory names, and can be consulted in the make(1) 120 configuration file in order to set additional build parame- 121 ters, such as compiler flags. 122 123 DESTDIR Directory to contain the built NetBSD system. If set, spe- 124 cial options are passed to the compilation tools to prevent 125 their default use of the host system's /usr/include, 126 /usr/lib, and so forth. This pathname should not end with a 127 slash (/) character (for installation into the system's root 128 directory, set DESTDIR to an empty string). The directory 129 must reside on a file system which supports long file names 130 and hard links. 131 132 Default: Empty string if USETOOLS is ``yes''; unset other- 133 wise. 134 135 Note: build.sh will provide a default of destdir.MACHINE (in 136 the top-level .OBJDIR) unless run in `expert' mode 137 138 MAKECONF The name of the make(1) configuration file. Only settable in 139 the process environment. 140 141 Default: ``/etc/mk.conf'' 142 143 MKCATPAGES Can be set to ``yes'' or ``no''. Indicates whether prefor- 144 matted plaintext manual pages will be created during a build. 145 146 Default: ``yes'' 147 148 MKCRYPTO Can be set to ``yes'' or ``no''. Indicates whether crypto- 149 graphic code will be included in a build; provided for the 150 benefit of countries that do not allow strong cryptography. 151 Will not affect use of the standard low-security password en- 152 cryption system, crypt(3). 153 154 Default: ``yes'' 155 156 MKDOC Can be set to ``yes'' or ``no''. Indicates whether system 157 documentation destined for DESTDIR/usr/share/doc will be in- 158 stalled during a build. 159 160 Default: ``yes'' 161 162 MKHOSTOBJ Can be set to ``yes'' or ``no''. If set to ``yes'', then for 163 programs intended to be run on the compile host, the name, 164 release, and architecture of the host operating system will 165 be suffixed to the name of the object directory created by 166 ``make obj''. (This allows multiple host systems to compile 167 NetBSD for a single target.) If set to ``no'', then programs 168 built to be run on the compile host will use the same object 169 directory names as programs built to be run on the target. 170 171 Default: ``no'' 172 173 MKINFO Can be set to ``yes'' or ``no''. Indicates whether GNU Info 174 files, used for the documentation for most of the compilation 175 tools, will be created and installed during a build. 176 177 Default: ``yes'' 178 179 MKLINT Can be set to ``yes'' or ``no''. Indicates whether lint(1) 180 will be run against portions of the NetBSD source code during 181 the build, and whether lint libraries will be installed into 182 DESTDIR/usr/libdata/lint. 183 184 Default: ``yes'' 185 186 MKMAN Can be set to ``yes'' or ``no''. Indicates whether manual 187 pages will be installed during a build. 188 189 Default: ``yes'' 190 191 MKNLS Can be set to ``yes'' or ``no''. Indicates whether Native 192 Language System locale zone files will be compiled and in- 193 stalled during a build. 194 195 Default: ``yes'' 196 197 MKOBJ Can be set to ``yes'' or ``no''. Indicates whether object 198 directories will be created when running ``make obj''. If 199 set to ``no'', then all built files will be located inside 200 the regular source tree. 201 202 Default: ``yes'' 203 204 MKPIC Can be set to ``yes'' or ``no''. Indicates whether shared 205 objects and libraries will be created and installed during a 206 build. If set to ``no'', the entire built system will be 207 statically linked. 208 209 Default: Platform dependent. As of this writing, all plat- 210 forms except sh3 default to ``yes''. 211 212 MKPICINSTALL 213 Can be set to ``yes'' or ``no''. Indicates whether the ar(1) 214 format libraries (lib*_pic.a), used to generate shared li- 215 braries, are installed during a build. 216 217 Default: ``yes'' 218 219 MKPROFILE Can be set to ``yes'' or ``no''. Indicates whether profiled 220 libraries (lib*_p.a) will be built and installed during a 221 build. 222 223 Default: ``yes''; however, some platforms turn off MKPROFILE 224 by default at times due to toolchain problems with profiled 225 code. 226 227 MKSHARE Can be set to ``yes'' or ``no''. Indicates whether files 228 destined to reside in DESTDIR/usr/share will be built and in- 229 stalled during a build. If set to ``no'', then all of 230 MKCATPAGES, MKDOC, MKINFO, MKMAN, and MKNLS will be set to 231 ``no'' unconditionally. 232 233 Default: ``yes'' 234 235 TOOLDIR Directory to hold the host tools, once built. This directory 236 should be unique to a given host system and NetBSD source 237 tree. (However, multiple targets may share the same TOOLDIR; 238 the target-dependent files have unique names.) If unset, a 239 default based on the uname(1) information of the host plat- 240 form will be created in the .OBJDIR of src/tools. 241 242 Default: Unset. 243 244 UNPRIVED If set, then an unprivileged install will occur. The user, 245 group, permissions, and file flags, will not be set on the 246 installed item; instead the information will be appended to a 247 file called METALOG in DESTDIR. The contents of METALOG is 248 used during the generation of the distribution tar files to 249 ensure that the appropriate file ownership is stored. 250 251 Default: Unset. 252 253 UPDATE If set, then all install operations intended to write to 254 DESTDIR will compare file timestamps before installing, and 255 skip the install phase if the destination files are up-to- 256 date. This also has implications on full builds (see next 257 subsection). 258 259 Default: Unset. 260 261 USETOOLS Indicates whether the tools specified by TOOLDIR should be 262 used as part of a build in progress. Must be set to ``yes'' 263 if cross-compiling. 264 265 yes Use the tools from TOOLDIR. 266 267 no Do not use the tools from TOOLDIR, but refuse to build 268 native compilation tool components that are version- 269 specific for that tool. 270 271 never Do not use the tools from TOOLDIR, even when building 272 native tool components. This is similar to the tradi- 273 tional NetBSD build method, but does not verify that 274 the compilation tools in use are up-to-date enough in 275 order to build the tree successfully. This may cause 276 build or runtime problems when building the whole 277 NetBSD source tree. 278 279 Default: ``yes'' if building all or part of a whole NetBSD 280 source tree (detected automatically); ``no'' otherwise (to 281 preserve traditional semantics of the <bsd.*.mk> make(1) in- 282 clude files). 283 284 "make" variables for full builds 285 These variables only affect the top level ``Makefile'' and do not affect 286 manually building subtrees of the NetBSD source code. 287 288 INSTALLWORLDDIR Location for the ``make installworld'' target to install 289 to. 290 291 Default: ``/'' 292 293 MKOBJDIRS Can be set to ``yes'' or ``no''. Indicates whether ob- 294 ject directories will be created automatically (via a 295 ``make obj'' pass) at the start of a build. 296 297 Default: ``yes'' 298 299 NBUILDJOBS Now obsolete. Use the make(1) option -j, instead (see 300 below) 301 302 Default: Unset. 303 304 NOCLEANDIR If set, avoids the ``make cleandir'' phase of a full 305 build. This has the effect of allowing only changed 306 files in a source tree to be recompiled. This can speed 307 up builds when updating only a few files in the tree. 308 309 Default: Unset. 310 311 NODISTRIBDIRS If set, avoids the ``make distrib-dirs'' phase of a full 312 build. This skips running mtree(8) on DESTDIR, useful 313 on systems where building as an unprivileged user, or 314 where it is known that the system-wide mtree files have 315 not changed. 316 317 Default: Unset. 318 319 NOINCLUDES If set, avoids the ``make includes'' phase of a full 320 build. This has the effect of preventing make(1) from 321 thinking that some programs are out-of-date simply be- 322 cause the system include files have changed. However, 323 this option should not be used when updating the entire 324 NetBSD source tree arbitrarily; it is suggested to use 325 UPDATE in that case. 326 327 Default: Unset. 328 329 RELEASEDIR If set, specifies the directory to which a release(7) 330 layout will be written at the end of a ``make release''. 331 332 Default: Unset. 333 334 Note: build.sh will provide a default of releasedir (in 335 the top-level .OBJDIR) unless run in `expert' mode 336 337 UPDATE If set, then in addition to the effects described for 338 UPDATE above, this implies the effects of NOCLEANDIR 339 (i.e., ``make cleandir'' is avoided). 340 341 BUILDING 342 "make" command line options 343 This is only a summary of options available to make(1); only the options 344 used most frequently with NetBSD builds are listed here. 345 346 -j njob Run up to njob make(1) subjobs in parallel. Makefiles should 347 use .WAIT or have explicit dependancies as necessary to en- 348 force build ordering. If you see build failures with -j, 349 please save complete build logs so the failures can be ana- 350 lyzed. 351 352 -m dir Specify the default directory for searching for system Make- 353 file segments, mainly the <bsd.*.mk> files. When building any 354 full NetBSD source tree, this should be set to the 355 ``share/mk'' directory in the source tree. (This is set auto- 356 matically when building from the top level.) 357 358 -n Display the commands that would have been executed, but do not 359 actually execute them. This will still cause recursion to 360 take place. 361 362 -v var Print make(1)'s idea of the value of var. Does not build any 363 targets. 364 365 var=value Set the variable var to value, overriding any setting speci- 366 fied by the process environment, the MAKECONF configuration 367 file, or the system Makefile segments. 368 369 "make" targets 370 These default targets may be built by running make(1) in any subtree of 371 the NetBSD source code. It is recommended that none of these be used 372 from the top level Makefile; as a specific exception, ``make obj'' and 373 ``make cleandir'' are useful in that context. 374 375 all Build programs, libraries, and preformatted documentation. 376 377 clean Remove program and library object code files. 378 379 cleandir Same as clean, but also remove preformatted documentation, de- 380 pendency files generated by ``make depend'', and any other 381 files known to be created at build time. ``make distclean'' 382 may be used as a synonym, for familiarity with a similar well- 383 known convention. 384 385 depend Create dependency files (.depend) containing more detailed in- 386 formation about the dependencies of source code on header 387 files. Allows programs to be recompiled automatically when a 388 dependency changes. 389 390 dependall Does a ``make depend'' immediately followed by a ``make all''. 391 This improves cache locality of the build since both passes 392 read the source files in their entirety. 393 394 includes Build and install system header files. Typically needed be- 395 fore any system libraries or programs can be built. 396 397 install Install programs, libraries, and documentation into DESTDIR. 398 Few files will be installed to DESTDIR/dev, DESTDIR/etc, 399 DESTDIR/root or DESTDIR/var in order to prevent user supplied 400 configuration data from being overwritten. 401 402 lint Run lint(1) against the C source code, where appropriate, and 403 generate system-installed lint libraries. 404 405 obj Create object directories to be used for built files, instead 406 of building directly in the source tree. 407 408 tags Create ctags(1) searchable function lists usable by the ex(1) 409 and vi(1) text editors. 410 411 "make" targets for the top level 412 Additional make(1) targets are usable specifically from the top source 413 level to facilitate building the entire NetBSD source tree. 414 415 build Build the entire NetBSD system. This orders portions of 416 the source tree such that prerequisites will be built in 417 the proper order. 418 419 distribution Do a ``make build'', and then install a full distribution 420 into DESTDIR, including files in DESTDIR/dev, DESTDIR/etc, 421 DESTDIR/root and DESTDIR/var. 422 423 buildworld As per ``make distribution'', except that it ensures that 424 DESTDIR is not the root directory. 425 426 installworld Install the distribution from DESTDIR to INSTALLWORLDDIR 427 (which defaults to the root directory). Ensures that 428 INSTALLWORLDDIR is the not root directory if cross compil- 429 ing. 430 431 Note: It is highly recommended that you upgrade your kernel 432 and reboot before performing this operation. 433 434 sets Create distribution sets from DESTDIR into 435 RELEASEDIR/MACHINE/binary/sets. Should be run after ``make 436 distribution'' (as ``make build'' does not install all of 437 the required files). 438 439 sourcesets Create source sets of the source tree into 440 RELEASEDIR/source/sets. 441 442 release Do a ``make distribution'', build kernels, distribution me- 443 dia, and install sets (this as per ``make sets''), and then 444 package the system into a standard release layout as de- 445 scribed by release(7). This requires that RELEASEDIR be 446 set (see above). 447 448 regression-tests 449 Can only be run after building the regression tests in the 450 directory ``regress''. Runs the compiled regression tests 451 on the local host. 452 453 The "build.sh" script 454 This script file is a Bourne shell script designed to build the entire 455 NetBSD system on any host with a Bourne shell in /bin/sh, including many 456 that are not POSIX compliant. Note that if a host system's /bin/sh is 457 unusually old and broken, the Korn Shell (/bin/ksh), if available, may be 458 a usable alternative. 459 460 All cross-compile builds, and most native builds, of the entire system 461 should make use of build.sh rather than just running ``make''. This way, 462 the make(1) program will be bootstrapped properly, in case the host sys- 463 tem has an older or incompatible ``make'' program. 464 465 When compiling the entire system via build.sh, many make(1) variables are 466 set for you in order to help encapsulate the build process. In the list 467 of options below, variables that are automatically set by build.sh are 468 noted where applicable. 469 470 The following operations are supported by build.sh: 471 472 build Build the system as per ``make build''. This option im- 473 plies the obj and tools operations. 474 475 distribution Build a full distribution as per ``make distribution''. 476 This option implies the build operation. 477 478 release Build a full release as per ``make release''. This option 479 implies the distribution operation. 480 481 makewrapper Create the nbmake-MACHINE wrapper. This operation is auto- 482 matically performed for any of the other operations. 483 484 obj Perform ``make obj''. 485 486 tools Build and install the host tools from src/tools. 487 488 kernel=kconf Build a new kernel. The kconf argument is the name of a 489 configuration file suitable for use by config(8). If kconf 490 does not contain any `/' characters, the configuration file 491 is expected to be found in the KERNCONFDIR directory, which 492 is typically sys/arch/MACHINE/conf. The new kernel will be 493 built in a subdirectory of KERNOBJDIR, which is typically 494 sys/arch/MACHINE/compile or an associated object directory. 495 In order to ensure that the kernel is built using up-to- 496 date tools, it is strongly recommended that the tools be 497 rebuilt (using the tools operation). 498 499 install=idir Install the contents of DESTDIR to idir, using ``make 500 installworld''. 501 502 sets Perform ``make sets''. 503 504 sourcesets Perform ``make sourcesets''. 505 506 The following command line options alter the behaviour of the above oper- 507 ations: The following command line options alter the behaviour of the 508 build.sh operations described above: 509 510 -a arch Set the value of MACHINE_ARCH to arch. 511 512 -B buildid 513 Set the value of BUILDID to buildid. This will also append the 514 build idenfitier to the name of the ``make'' wrapper script so 515 that the resulting name is of the form ``nbmake-MACHINE- 516 BUILDID''. 517 518 -D dest Set the value of DESTDIR to dest. 519 520 -E Set `expert' mode. This overrides various sanity checks, and 521 allows: DESTDIR does not have to be set to a non-root path for 522 builds, and UNPRIVED does not have to be set when building as a 523 non-root user. 524 525 Note: It is highly recommended that you know what you are doing 526 when you use this option. 527 528 -j njob Passed through to make(1). Makefiles should use .WAIT or have 529 explicit dependancies as necessary to enforce build ordering. 530 If you see build failures with -j, please save complete build 531 logs so the failures can be analyzed. 532 533 -M obj Set MAKEOBJDIRPREFIX to obj. 534 535 -m mach Set the value of MACHINE to mach. This will also override any 536 value of MACHINE_ARCH in the process environment with a value 537 deduced from mach, unless -a is specified. All cross builds 538 require -m, but if unset on a NetBSD host, the host's value of 539 MACHINE will be detected and used automatically. 540 541 -n Show the commands that would be executed by build.sh, but do 542 not make any changes. This is similar in concept to ``make 543 -n''. 544 545 -O obj Create an appropriate transform macro for MAKEOBJDIR that will 546 place the built object files under obj. For instance, a set- 547 ting of /usr/obj will place build-time files under 548 /usr/obj/bin, /usr/obj/lib, and so forth. 549 550 -o Set the value of MKOBJDIRS to ``no''. 551 552 -R rel Set the value of RELEASEDIR to rel. 553 554 -r Remove the contents of DESTDIR and TOOLDIR before building 555 (provides a clean starting point). This will skip deleting 556 DESTDIR if building on a native system to the root directory. 557 558 -T tools Set the value of TOOLDIR to tools. If set, the bootstrap 559 ``make'' will only be rebuilt as needed (when the source files 560 for make(1) change). 561 562 -U Set the UNPRIVED variable. 563 564 -u Set the UPDATE variable. 565 566 -V var=[value] 567 Set the variable var to value (which is optional). 568 569 -w wrapper 570 Create the nbmake wrapper script (see below) in a custom loca- 571 tion, specified by wrapper. This allows, for instance, to 572 place the wrapper in PATH automatically. Note that wrapper is 573 the full name of the file, not just a directory name. 574 575 The "nbmake-MACHINE" wrapper script 576 If using the build.sh script to build NetBSD, a nbmake-MACHINE script 577 will be created in TOOLDIR/bin upon the first build to assist in building 578 subtrees on a cross-compile host. 579 580 nbmake-MACHINE can be invoked in lieu of make(1), and will instead call 581 the up-to-date version of ``nbmake'' installed into TOOLDIR/bin with sev- 582 eral key variables pre-set, including MACHINE, MACHINE_ARCH, and TOOLDIR. 583 This script can be symlinked into a directory listed in PATH, or called 584 with an absolute path. 585 586 EXAMPLES 587 1. ./build.sh tools kernel=GENERIC 588 589 Build a new toolchain, and use the new toolchain to configure and 590 build a new GENERIC kernel. 591 592 2. ./build.sh -U distribution 593 594 Using unprivileged mode, build a complete distribution to a DESTDIR 595 directory that build.sh selects (and will display). 596 597 3. # ./build.sh -U install=/ 598 599 As root, install to / the distribution that was built by example 2. 600 Even though this is run as root, -U is required so that the permis- 601 sions stored in DESTDIR/METALOG are correctly applied to the files 602 as they're copied to /. 603 604 4. ./build.sh -U -u release 605 606 Using unprivileged mode, build a complete release to DESTDIR and 607 RELEASEDIR directories that build.sh selects (and will display). 608 UPDATE (-u) is set to prevent the ``make cleandir'', so that if this 609 is run after example 2, it doesn't need to redo that portion of the 610 release build. 611 612 OBSOLETE VARIABLES 613 NBUILDJOBS Use the make(1) option -j, instead. 614 615 USE_NEW_TOOLCHAIN 616 The new toolchain is now the default. To disable, use 617 TOOLCHAIN_MISSING=yes. 618 619 SEE ALSO 620 make(1), hier(7), release(7) 621 622 HISTORY 623 The build.sh based build scheme was introduced for NetBSD 1.6 as 624 USE_NEW_TOOLCHAIN, and re-worked to TOOLCHAIN_MISSING after that. 625 626 BUGS 627 A few platforms are not yet using this build system. 628 629 NetBSD May 8, 2003 10 630
Indexes created Fri Oct 10 14:10:03 GMT 2025