BUILDING revision 1.10
1BUILDING(8) NetBSD System Manager's Manual BUILDING(8) 2 3NAME 4 BUILDING - Procedure for building NetBSD from source code. 5 6STATUS 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 USE_NEW_TOOLCHAIN 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 21REQUIREMENTS 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 host toolchain components are not yet available in 34 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 38FILES 39 Source tree layout 40 41 BUILDING.mdoc This document (in -mdoc troff format; the original copy). 42 43 BUILDING This document (in plaintext). 44 45 Makefile The main Makefile for NetBSD; should only be run for na- 46 tive builds with an appropriately up-to-date version of 47 NetBSD make(1). (For building from out-of-date systems or 48 on a non-native host, see the build.sh shell script.) 49 50 UPDATING Special notes for updating from an earlier revision of 51 NetBSD. It is important to read this file before every 52 build of an updated source tree. 53 54 build.sh Bourne-compatible shell script used for building the host 55 build tools and the NetBSD system from scratch. Can be 56 used for both native and cross builds, and should be used 57 instead of make(1) for any source tree that is updated and 58 recompiled regularly. 59 60 crypto/dist/, dist/, gnu/dist/ 61 Sources imported verbatim from third parties, without man- 62 gling the existing build structure. Other source trees in 63 bin through usr.sbin use the NetBSD make(1) ``reachover'' 64 Makefile semantics when building these programs for a na- 65 tive host. 66 67 distrib/, etc/ 68 Sources for items used when making a full release snap- 69 shot, such as files installed in /etc on the destination 70 system, boot media, and release notes. 71 72 regress/ Regression test harness. Can be cross-compiled, but only 73 run natively. 74 75 sys/ NetBSD kernel sources. 76 77 tools/ ``Reachover'' build structure for the host build tools. 78 This has a special method of determining out-of-date sta- 79 tus. 80 81 bin/ ... usr.sbin/ 82 Sources to the NetBSD userland (non-kernel) programs. If 83 any of these directories are missing, they will be skipped 84 during the build. 85 86 Build tree layout 87 The NetBSD build tree is described in hier(7), and the release layout is 88 described in release(7). 89 90CONFIGURATION 91 Environment variables 92 Several environment variables control the behaviour of NetBSD builds. 93 94 MACHINE Machine type. 95 96 MACHINE_ARCH Machine architecture. 97 98 MAKE Path name to invoke make(1) as. 99 100 MAKEFLAGS Flags to invoke make(1) with. 101 102 MAKEOBJDIR Directory to use as the .OBJDIR for the current direc- 103 tory. Used only if MAKEOBJDIRPREFIX is not defined. 104 MAKEOBJDIR can only be provided in the environment. 105 106 MAKEOBJDIRPREFIX Top level directory of the object directory tree. If 107 this is defined, ${MAKEOBJDIRPREFIX}/${.CURDIR} is used 108 as the .OBJDIR for the current directory. The current 109 directory may be read only. MAKEOBJDIRPREFIX can only 110 be provided in the environment. 111 112 "make" variables 113 Several variables control the behavior of NetBSD builds. Unless other- 114 wise specified, these variables may be set in either the process environ- 115 ment or the make(1) configuration file specified by MAKECONF. 116 117 BUILDID Identifier for the build. The identifier will be appended to 118 object directory names, and can be consulted in the make(1) 119 configuration file in order to set additional build parame- 120 ters, such as compiler flags. 121 122 DESTDIR Directory to contain the built NetBSD system. If set, spe- 123 cial options are passed to the compilation tools to prevent 124 their default use of the host system's /usr/include, 125 /usr/lib, and so forth. This pathname should not end with a 126 slash (/) character (for installation into the system's root 127 directory, set DESTDIR to an empty string). The directory 128 must reside on a file system which supports long file names 129 and hard links. 130 131 Default: Empty string if USETOOLS is ``yes''; unset other- 132 wise. 133 134 MAKECONF The name of the make(1) configuration file. Only settable in 135 the process environment. 136 137 Default: ``/etc/mk.conf'' 138 139 MKCATPAGES Can be set to ``yes'' or ``no''. Indicates whether prefor- 140 matted plaintext manual pages will be created during a build. 141 142 Default: ``yes'' 143 144 MKCRYPTO Can be set to ``yes'' or ``no''. Indicates whether crypto- 145 graphic code will be included in a build; provided for the 146 benefit of countries that do not allow strong cryptography. 147 Will not affect use of the standard low-security password en- 148 cryption system, crypt(3). 149 150 Default: ``yes'' 151 152 MKDOC Can be set to ``yes'' or ``no''. Indicates whether system 153 documentation destined for /usr/share/doc will be installed 154 during a build. 155 156 Default: ``yes'' 157 158 MKHOSTOBJ Can be set to ``yes'' or ``no''. If set to ``yes'', then for 159 programs intended to be run on the compile host, the name, 160 release, and architecture of the host operating system will 161 be suffixed to the name of the object directory created by 162 ``make obj''. (This allows multiple host systems to compile 163 NetBSD for a single target.) If set to ``no'', then programs 164 built to be run on the compile host will use the same object 165 directory names as programs built to be run on the target. 166 167 Default: ``no'' 168 169 MKINFO Can be set to ``yes'' or ``no''. Indicates whether GNU Info 170 files, used for the documentation for most of the compilation 171 tools, will be created and installed during a build. 172 173 Default: ``yes'' 174 175 MKLINT Can be set to ``yes'' or ``no''. Indicates whether lint(1) 176 will be run against portions of the NetBSD source code during 177 the build, and whether lint libraries will be installed into 178 /usr/libdata/lint. 179 180 Default: ``yes'' 181 182 MKMAN Can be set to ``yes'' or ``no''. Indicates whether manual 183 pages will be installed during a build. 184 185 Default: ``yes'' 186 187 MKNLS Can be set to ``yes'' or ``no''. Indicates whether Native 188 Language System locale zone files will be compiled and in- 189 stalled during a build. 190 191 Default: ``yes'' 192 193 MKOBJ Can be set to ``yes'' or ``no''. Indicates whether object 194 directories will be created when running ``make obj''. If 195 set to ``no'', then all built files will be located inside 196 the regular source tree. 197 198 Default: ``yes'' 199 200 MKPIC Can be set to ``yes'' or ``no''. Indicates whether shared 201 objects and libraries will be created and installed during a 202 build. If set to ``no'', the entire built system will be 203 statically linked. 204 205 Default: Platform dependent. As of this writing, all plat- 206 forms except sh3 default to ``yes''. 207 208 MKPICINSTALL 209 Can be set to ``yes'' or ``no''. Indicates whether the ar(1) 210 format libraries (lib*_pic.a), used to generate shared li- 211 braries, are installed during a build. 212 213 Default: ``yes'' 214 215 MKPROFILE Can be set to ``yes'' or ``no''. Indicates whether profiled 216 libraries (lib*_p.a) will be built and installed during a 217 build. 218 219 Default: ``yes''; however, some platforms turn off MKPROFILE 220 by default at times due to toolchain problems with profiled 221 code. 222 223 MKSHARE Can be set to ``yes'' or ``no''. Indicates whether files 224 destined to reside in /usr/share will be built and installed 225 during a build. If set to ``no'', then all of MKCATPAGES, 226 MKDOC, MKINFO, MKMAN, and MKNLS will be set to ``no'' uncon- 227 ditionally. 228 229 Default: ``yes'' 230 231 TOOLDIR Directory to hold the host tools, once built. This directory 232 should be unique to a given host system and NetBSD source 233 tree. (However, multiple targets may share the same TOOLDIR; 234 the target-dependent files have unique names.) If unset, a 235 default based on the uname(1) information of the host plat- 236 form will be created in the .OBJDIR of src/tools. 237 238 Default: Unset. 239 240 UNPRIVED If set, then an unprivileged install will occur. The user, 241 group, permissions, and file flags, will not be set on the 242 installed item; instead the information will be appended to a 243 file called METALOG in the .OBJDIR of src. The contents of 244 METALOG is used during the generation of the distribution tar 245 files to ensure that the appropriate file ownership is 246 stored. 247 248 Default: Unset. 249 250 UPDATE If set, then all install operations intended to write to 251 DESTDIR will compare file timestamps before installing, and 252 skip the install phase if the destination files are up-to- 253 date. This also has implications on full builds (see next 254 subsection). 255 256 Default: Unset. 257 258 USETOOLS Indicates whether the tools specified by TOOLDIR should be 259 used as part of a build in progress. Must be set to ``yes'' 260 if cross-compiling. 261 262 yes Use the tools from TOOLDIR. 263 264 no Do not use the tools from TOOLDIR, but refuse to build 265 native compilation tool components that are version- 266 specific for that tool. 267 268 never Do not use the tools from TOOLDIR, even when building 269 native tool components. This is similar to the tradi- 270 tional NetBSD build method, but does not verify that 271 the compilation tools in use are up-to-date enough in 272 order to build the tree successfully. This may cause 273 build or runtime problems when building the whole 274 NetBSD source tree. 275 276 Default: ``yes'' if building all or part of a whole NetBSD 277 source tree (detected automatically); ``no'' otherwise (to 278 preserve traditional semantics of the <bsd.*.mk> make(1) in- 279 clude files). 280 281 "make" variables for full builds 282 These variables only affect the top level ``Makefile'' and do not affect 283 manually building subtrees of the NetBSD source code. 284 285 MKOBJDIRS Can be set to ``yes'' or ``no''. Indicates whether object 286 directories will be created automatically (via a ``make 287 obj'' pass) at the start of a build. 288 289 Default: ``yes'' 290 291 NBUILDJOBS Now obsolete. Use the make(1) option -j, instead (see be- 292 low) 293 294 Default: Unset. 295 296 NOCLEANDIR If set, avoids the ``make cleandir'' phase of a full 297 build. This has the effect of allowing only changed files 298 in a source tree to be recompiled. This can speed up 299 builds when updating only a few files in the tree. 300 301 Default: Unset. 302 303 NODISTRIBDIRS If set, avoids the ``make distrib-dirs'' phase of a full 304 build. This skips running mtree(8) on DESTDIR, useful on 305 systems where building as an unprivileged user, or where 306 it is known that the system-wide mtree files have not 307 changed. 308 309 Default: Unset. 310 311 NOINCLUDES If set, avoids the ``make includes'' phase of a full 312 build. This has the effect of preventing make(1) from 313 thinking that some programs are out-of-date simply because 314 the system include files have changed. However, this op- 315 tion should not be used when updating the entire NetBSD 316 source tree arbitrarily; it is suggested to use UPDATE in 317 that case. 318 319 Default: Unset. 320 321 RELEASEDIR If set, specifies the directory to which a release(7) lay- 322 out will be written at the end of a ``make release''. 323 324 Default: Unset. 325 326 UPDATE If set, then in addition to the effects described for UP- 327 DATE above, this implies the effects of NOCLEANDIR. 328 329BUILDING 330 "make" command line options 331 This is only a summary of options available to make(1); only the options 332 used most frequently with NetBSD builds are listed here. 333 334 -j njob Run up to njob make(1) subjobs in parallel. Makefiles should 335 use .WAIT or have explicit dependancies as necessary to en- 336 force build ordering. If you see build failures with -j, 337 please save complete build logs so the failures can be ana- 338 lyzed. 339 340 -m dir Specify the default directory for searching for system Make- 341 file segments, mainly the <bsd.*.mk> files. When building any 342 full NetBSD source tree, this should be set to the 343 ``share/mk'' directory in the source tree. (This is set auto- 344 matically when building from the top level.) 345 346 -n Display the commands that would have been executed, but do not 347 actually execute them. This will still cause recursion to 348 take place. 349 350 -v var Print make(1)'s idea of the value of var. Does not build any 351 targets. 352 353 var=value Set the variable var to value, overriding any setting speci- 354 fied by the process environment, the MAKECONF configuration 355 file, or the system Makefile segments. 356 357 "make" targets 358 These default targets may be built by running make(1) in any subtree of 359 the NetBSD source code. It is recommended that none of these be used 360 from the top level Makefile; as a specific exception, ``make obj'' and 361 ``make cleandir'' are useful in that context. 362 363 all Build programs, libraries, and preformatted documentation. 364 365 clean Remove program and library object code files. 366 367 cleandir Same as clean, but also remove preformatted documentation, de- 368 pendency files generated by ``make depend'', and any other 369 files known to be created at build time. ``make distclean'' 370 may be used as a synonym, for familiarity with a similar well- 371 known convention. 372 373 depend Create dependency files (.depend) containing more detailed in- 374 formation about the dependencies of source code on header 375 files. Allows programs to be recompiled automatically when a 376 dependency changes. 377 378 dependall Does a ``make depend'' immediately followed by a ``make all''. 379 This improves cache locality of the build since both passes 380 read the source files in their entirety. 381 382 includes Build and install system header files. Typically needed be- 383 fore any system libraries or programs can be built. 384 385 install Install programs, libraries, and documentation into DESTDIR. 386 387 lint Run lint(1) against the C source code, where appropriate, and 388 generate system-installed lint libraries. 389 390 obj Create object directories to be used for built files, instead 391 of building directly in the source tree. 392 393 tags Create ctags(1) searchable function lists usable by the ex(1) 394 and vi(1) text editors. 395 396 "make" targets for the top level 397 Additional make(1) targets are usable specifically from the top source 398 level to facilitate building the entire NetBSD source tree. 399 400 build Build the entire NetBSD system. This orders portions of the 401 source tree such that prerequisites will be built in the prop- 402 er order. 403 404 release Do a ``make build'', then package the system into a standard 405 release layout as described by release(7). This requires that 406 RELEASEDIR be set (see above). 407 408 regression-tests 409 Can only be run after building the regression tests in the di- 410 rectory ``regress''. Runs the compiled regression tests on 411 the local host. 412 413 The "build.sh" script 414 This script file is a Bourne shell script designed to build the entire 415 NetBSD system on any host with a Bourne shell in /bin/sh, including many 416 that are not POSIX compliant. Note that if a host system's /bin/sh is 417 unusually old and broken, the Korn Shell (/bin/ksh), if available, may be 418 a usable alternative. 419 420 All cross-compile builds, and most native builds, of the entire system 421 should make use of build.sh rather than just running ``make''. This way, 422 the make(1) program will be bootstrapped properly, in case the host sys- 423 tem has an older or incompatible ``make'' program. 424 425 When compiling the entire system via build.sh, many make(1) variables are 426 set for you in order to help encapsulate the build process. In the list 427 of options below, variables that are automatically set by build.sh are 428 noted where applicable. 429 430 The following are available command line options that may be supplied to 431 build.sh: 432 433 -a arch Set the value of MACHINE_ARCH to arch. 434 435 -B buildid 436 Set the value of BUILDID to buildid. This will also append the 437 build idenfitier to the name of the ``make'' wrapper script so 438 that the resulting name is of the form ``nbmake-MACHINE- 439 BUILDID''. 440 441 -b Bootstrap ``make'' and create a nbmake-MACHINE script (see be- 442 low). 443 444 -d Build a full distribution. This differs from a normal build in 445 that etc files will also be installed. Note this does not 446 build a ``release''; no release sets are placed in ${RE- 447 LEASEDIR}. 448 449 -j njob Passed through to make(1). Makefiles should use .WAIT or have 450 explicit dependancies as necessary to enforce build ordering. 451 If you see build failures with -j, please save complete build 452 logs so the failures can be analyzed. 453 454 -m mach Set the value of MACHINE to mach. This will also override any 455 value of MACHINE_ARCH in the process environment with a value 456 deduced from mach, unless -a is specified. All cross builds 457 require -m, but if unset on a NetBSD host, the host's value of 458 MACHINE will be detected and used automatically. 459 460 -n Show the commands that would be executed by build.sh, but do 461 not make any changes. This is similar in concept to ``make 462 -n''. 463 464 -o Set the value of MKOBJDIRS to ``no''. 465 466 -r Remove the contents of DESTDIR and TOOLDIR before building 467 (provides a clean starting point). This will skip deleting 468 DESTDIR if building on a native system to the root directory. 469 470 -t Build and install the host tools from src/tools only. This op- 471 tion implies -b. 472 473 -u Set the UPDATE variable. 474 475 -w wrapper 476 Create the nbmake wrapper script (see below) in a custom loca- 477 tion, specified by wrapper. This allows, for instance, to 478 place the wrapper in PATH automatically. Note that wrapper is 479 the full name of the file, not just a directory name. 480 481 -D dest Set the value of DESTDIR to dest. 482 483 -O obj Create an appropriate transform macro for MAKEOBJDIR that will 484 place the built object files under obj. For instance, a set- 485 ting of /usr/obj will place build-time files files under 486 /usr/obj/bin, /usr/obj/lib, and so forth. 487 488 -R rel Set the value of RELEASEDIR to rel. Setting this option will 489 cause build.sh to run ``make release'' instead of ``make 490 build''. 491 492 -T tools Set the value of TOOLDIR to tools. If set, the bootstrap 493 ``make'' will only be rebuilt as needed (when the source files 494 for make(1) change). 495 496 -U Set the UNPRIVED variable. 497 498 The "nbmake-MACHINE" wrapper script 499 If using the build.sh script to build NetBSD, a nbmake-MACHINE script 500 will be created in TOOLDIR/bin upon the first build to assist in building 501 subtrees on a cross-compile host. 502 503 nbmake-MACHINE can be invoked in lieu of make(1), and will instead call 504 the up-to-date version of ``nbmake'' installed into TOOLDIR/bin with sev- 505 eral key variables pre-set, including MACHINE, MACHINE_ARCH, and TOOLDIR. 506 This script can be symlinked into a directory listed in PATH, or called 507 with an absolute path. 508 509OBSOLETE VARIABLES 510 NBUILDJOBS Now obsolete. Use the make(1) option -j, instead. 511 512SEE ALSO 513 make(1), hier(7), release(7) 514 515HISTORY 516 The USE_NEW_TOOLCHAIN based build scheme was introduced in the ``NetBSD- 517 current'' development sources between NetBSD 1.5 and NetBSD 1.6. 518 519BUGS 520 A few platforms are not yet using the USE_NEW_TOOLCHAIN system. 521 522NetBSD March 5, 2002 8 523