BUILDING revision 1.7
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 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 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 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 38 FILES 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 (For building from out-of-date systems or 48 on a non-native host, see the build.sh shell script.) 49 50 UPDATING Special notes for updating from an earlier revision of 51 NetBSD.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 90 CONFIGURATION 91 "make" variables 92 Several variables control the behavior of NetBSD builds. Unless other- 93 wise specified, these variables may be set in either the process environ- 94 ment or the make(1) configuration file specified by MAKECONF. 95 96 DESTDIR Directory to contain the built NetBSD system. If set, spe- 97 cial options are passed to the compilation tools to prevent 98 their default use of the host system's /usr/include, 99 /usr/lib, and so forth. This pathname should not end with a 100 slash (/) character (for installation into the system's root 101 directory, set DESTDIR to an empty string). The directory 102 must reside on a file system which supports long file names 103 and hard links. 104 105 Default: Empty string if USETOOLS is ``yes''; unset other- 106 wise. 107 108 MAKECONF The name of the make(1) configuration file. Only settable in 109 the process environment. 110 111 Default: ``/etc/mk.conf'' 112 113 MKCATPAGES Can be set to ``yes'' or ``no''. Indicates whether prefor- 114 matted plaintext manual pages will be created during a build. 115 116 Default: ``yes'' 117 118 MKCRYPTO Can be set to ``yes'' or ``no''. Indicates whether crypto- 119 graphic code will be included in a build; provided for the 120 benefit of countries that do not allow strong cryptography. 121 Will not affect use of the standard low-security password en- 122 cryption system, crypt(3). 123 124 Default: ``yes'' 125 126 MKDOC Can be set to ``yes'' or ``no''. Indicates whether system 127 documentation destined for /usr/share/doc will be installed 128 during a build. 129 130 Default: ``yes'' 131 132 MKHOSTOBJ Can be set to ``yes'' or ``no''. If set to ``yes'', then for 133 programs intended to be run on the compile host, the name, 134 release, and architecture of the host operating system will 135 be suffixed to the name of the object directory created by 136 ``make obj''. (This allows multiple host systems to compile 137 NetBSD for a single target.) If set to ``no'', then programs 138 built to be run on the compile host will use the same object 139 directory names as programs built to be run on the target. 140 141 Default: ``no'' 142 143 MKINFO Can be set to ``yes'' or ``no''. Indicates whether GNU Info 144 files, used for the documentation for most of the compilation 145 tools, will be created and installed during a build. 146 147 Default: ``yes'' 148 149 MKLINT Can be set to ``yes'' or ``no''. Indicates whether lint(1) 150 will be run against portions of the NetBSD source code during 151 the build, and whether lint libraries will be installed into 152 /usr/libdata/lint. 153 154 Default: ``yes'' 155 156 MKMAN Can be set to ``yes'' or ``no''. Indicates whether manual 157 pages will be installed during a build. 158 159 Default: ``yes'' 160 161 MKNLS Can be set to ``yes'' or ``no''. Indicates whether Native 162 Language System locale zone files will be compiled and in- 163 stalled during a build. 164 165 Default: ``yes'' 166 167 MKOBJ Can be set to ``yes'' or ``no''. Indicates whether object 168 directories will be created when running ``make obj''. If 169 set to ``no'', then all built files will be located inside 170 the regular source tree. 171 172 Default: ``yes'' 173 174 MKPIC Can be set to ``yes'' or ``no''. Indicates whether shared 175 objects and libraries will be created and installed during a 176 build. If set to ``no'', the entire built system will be 177 statically linked. 178 179 Default: Platform dependent. As of this writing, all plat- 180 forms except sh3 default to ``yes''. 181 182 MKPICINSTALL 183 Can be set to ``yes'' or ``no''. Indicates whether the ar(1) 184 format libraries (lib*_pic.a), used to generate shared li- 185 braries, are installed during a build. 186 187 Default: ``yes'' 188 189 MKPROFILE Can be set to ``yes'' or ``no''. Indicates whether profiled 190 libraries (lib*_p.a) will be built and installed during a 191 build. 192 193 Default: ``yes''; however, some platforms turn off MKPROFILE 194 by default at times due to toolchain problems with profiled 195 code. 196 197 MKSHARE Can be set to ``yes'' or ``no''. Indicates whether files 198 destined to reside in /usr/share will be built and installed 199 during a build. If set to ``no'', then all of MKCATPAGES, 200 MKDOC, MKINFO, MKMAN, and MKNLS will be set to ``no'' uncon- 201 ditionally. 202 203 Default: ``yes'' 204 205 TOOLDIR Directory to hold the host tools, once built. This directory 206 should be unique to a given host system and NetBSD source 207 tree. (However, multiple targets may share the same TOOLDIR; 208 the target-dependent files have unique names.) If unset, a 209 default based on the uname(1) information of the host plat- 210 form will be created in the .OBJDIR of src/tools. 211 212 Default: Unset. 213 214 UNPRIVED If set, then an unprivileged install will occur. The user, 215 group, permissions, and file flags, will not be set on the 216 installed item; instead the information will be appended to a 217 file called METALOG in the .OBJDIR of src. The contents of 218 METALOG is used during the generation of the distribution tar 219 files to ensure that the appropriate file ownership is 220 stored. 221 222 Default: Unset. 223 224 UPDATE If set, then all install operations intended to write to 225 DESTDIR will compare file timestamps before installing, and 226 skip the install phase if the destination files are up-to- 227 date. This also has implications on full builds (see next 228 subsection). 229 230 Default: Unset. 231 232 USETOOLS Indicates whether the tools specified by TOOLDIR should be 233 used as part of a build in progress. Must be set to ``yes'' 234 if cross-compiling. 235 236 yes Use the tools from TOOLDIR. 237 238 no Do not use the tools from TOOLDIR, but refuse to build 239 native compilation tool components that are version- 240 specific for that tool. 241 242 never Do not use the tools from TOOLDIR, even when building 243 native tool components. This is similar to the tradi- 244 tional NetBSD build method, but does not verify that 245 the compilation tools in use are up-to-date enough in 246 order to build the tree successfully. This may cause 247 build or runtime problems when building the whole 248 NetBSD source tree. 249 250 Default: ``yes'' if building all or part of a whole NetBSD 251 source tree (detected automatically); ``no'' otherwise (to 252 preserve traditional semantics of the <bsd.*.mk> make(1) in- 253 clude files). 254 255 "make" variables for full builds 256 These variables only affect the top level ``Makefile'' and do not affect 257 manually building subtrees of the NetBSD source code. 258 259 MKOBJDIRS Can be set to ``yes'' or ``no''. Indicates whether object 260 directories will be created automatically (via a ``make 261 obj'' pass) at the start of a build. 262 263 Default: ``yes'' 264 265 NBUILDJOBS If set, specifies the number of parallel make(1) processes 266 that should be run simultaneously. This can speed up 267 builds on SMP machines, or machines with much more CPU 268 power than I/O availability. This should be used instead 269 of the make(1) option -j, in order to ensure proper order- 270 ing of build components. 271 272 Default: Unset. 273 274 NOCLEANDIR If set, avoids the ``make cleandir'' phase of a full 275 build. This has the effect of allowing only changed files 276 in a source tree to be recompiled. This can speed up 277 builds when updating only a few files in the tree. 278 279 Default: Unset. 280 281 NODISTRIBDIRS If set, avoids the ``make distrib-dirs'' phase of a full 282 build. This skips running mtree(8) on DESTDIR, useful on 283 systems where building as an unprivileged user, or where 284 it is known that the system-wide mtree files have not 285 changed. 286 287 Default: Unset. 288 289 NOINCLUDES If set, avoids the ``make includes'' phase of a full 290 build. This has the effect of preventing make(1) from 291 thinking that some programs are out-of-date simply because 292 the system include files have changed. However, this op- 293 tion should not be used when updating the entire NetBSD 294 source tree arbitrarily; it is suggested to use UPDATE in 295 that case. 296 297 Default: Unset. 298 299 RELEASEDIR If set, specifies the directory to which a release(7) lay- 300 out will be written at the end of a ``make release''. 301 302 Default: Unset. 303 304 UPDATE If set, then in addition to the effects described for UP- 305 DATE above, this implies the effects of NOCLEANDIR. 306 307 BUILDING 308 "make" command line options 309 This is only a summary of options available to make(1); only the options 310 used most frequently with NetBSD builds are listed here. 311 312 -m dir Specify the default directory for searching for system Make- 313 file segments, mainly the <bsd.*.mk> files. When building any 314 full NetBSD source tree, this should be set to the 315 ``share/mk'' directory in the source tree. (This is set auto- 316 matically when building from the top level.) 317 318 -n Display the commands that would have been executed, but do not 319 actually execute them. This will still cause recursion to 320 take place. 321 322 -v var Print make(1)'s idea of the value of var. Does not build any 323 targets. 324 325 var=value Set the variable var to value, overriding any setting speci- 326 fied by the process environment, the MAKECONF configuration 327 file, or the system Makefile segments. 328 329 "make" targets 330 These default targets may be built by running make(1) in any subtree of 331 the NetBSD source code. It is recommended that none of these be used 332 from the top level Makefile; as a specific exception, ``make obj'' and 333 ``make cleandir'' are useful in that context. 334 335 all Build programs, libraries, and preformatted documentation. 336 337 clean Remove program and library object code files. 338 339 cleandir Same as clean, but also remove preformatted documentation, de- 340 pendency files generated by ``make depend'', and any other 341 files known to be created at build time. ``make distclean'' 342 may be used as a synonym, for familiarity with a similar well- 343 known convention. 344 345 depend Create dependency files (.depend) containing more detailed in- 346 formation about the dependencies of source code on header 347 files. Allows programs to be recompiled automatically when a 348 dependency changes. 349 350 dependall Does a ``make depend'' immediately followed by a ``make all''. 351 This combined target recurses as an atomic unit, so that the 352 ``make depend'' phase can participate in make -j parallelism. 353 354 includes Build and install system header files. Typically needed be- 355 fore any system libraries or programs can be built. 356 357 install Install programs, libraries, and documentation into DESTDIR. 358 359 lint Run lint(1) against the C source code, where appropriate, and 360 generate system-installed lint libraries. 361 362 obj Create object directories to be used for built files, instead 363 of building directly in the source tree. 364 365 tags Create ctags(1) searchable function lists usable by the ex(1) 366 and vi(1) text editors. 367 368 "make" targets for the top level 369 Additional make(1) targets are usable specifically from the top source 370 level to facilitate building the entire NetBSD source tree. 371 372 build Build the entire NetBSD system. This orders portions of the 373 source tree such that prerequisites will be built in the prop- 374 er order. 375 376 release Do a ``make build'', then package the system into a standard 377 release layout as described by release(7). This requires that 378 RELEASEDIR be set (see above). 379 380 regression-tests 381 Can only be run after building the regression tests in the di- 382 rectory ``regress''. Runs the compiled regression tests on 383 the local host. 384 385 The "build.sh" script 386 This script file is a Bourne shell script designed to build the entire 387 NetBSD system on any host with a Bourne shell in /bin/sh, including many 388 that are not POSIX compliant. Note that if a host system's /bin/sh is 389 unusually old and broken, the Korn Shell (/bin/ksh), if available, may be 390 a usable alternative. 391 392 All cross-compile builds, and most native builds, of the entire system 393 should make use of build.sh rather than just running ``make''. This way, 394 the make(1) program will be bootstrapped properly, in case the host sys- 395 tem has an older or incompatible ``make'' program. 396 397 When compiling the entire system via build.sh, many make(1) variables are 398 set for you in order to help encapsulate the build process. In the list 399 of options below, variables that are automatically set by build.sh are 400 noted where applicable. 401 402 The following are available command line options that may be supplied to 403 build.sh: 404 405 -a arch Set the value of MACHINE_ARCH to arch. 406 407 -b Bootstrap ``make'' and create a nbmake-MACHINE script (see be- 408 low). 409 410 -d Build a full distribution. This differs from a normal build in 411 that etc files will also be installed. Note this does not 412 build a ``release''; no release sets are placed in ${RE- 413 LEASEDIR}. 414 415 -j njob Set the value of NBUILDJOBS to njob. This provides similar 416 functionality to the familiar ``make -j'', but preserves the 417 ordering of the top level ``make build''. 418 419 -m mach Set the value of MACHINE to mach. This will also override any 420 value of MACHINE_ARCH in the process environment with a value 421 deduced from mach, unless -a is specified. All cross builds 422 require -m, but if unset on a NetBSD host, the host's value of 423 MACHINE will be detected and used automatically. 424 425 -n Show the commands that would be executed by build.sh, but do 426 not make any changes. This is similar in concept to ``make 427 -n''. 428 429 -o Set the value of MKOBJDIRS to ``no''. 430 431 -r Remove the contents of DESTDIR and TOOLDIR before building 432 (provides a clean starting point). This will skip deleting 433 DESTDIR if building on a native system to the root directory. 434 435 -t Build and install the host tools from src/tools only. This op- 436 tion implies -b. 437 438 -u Set the UPDATE variable. 439 440 -w wrapper 441 Create the nbmake wrapper script (see below) in a custom loca- 442 tion, specified by wrapper. This allows, for instance, to 443 place the wrapper in PATH automatically. Note that wrapper is 444 the full name of the file, not just a directory name. 445 446 -D dest Set the value of DESTDIR to dest. 447 448 -O obj Create an appropriate transform macro for MAKEOBJDIR that will 449 place the built object files under obj. For instance, a set- 450 ting of /usr/obj will place build-time files files under 451 /usr/obj/bin, /usr/obj/lib, and so forth. 452 453 -R rel Set the value of RELEASEDIR to rel. Setting this option will 454 cause build.sh to run ``make release'' instead of ``make 455 build''. 456 457 -T tools Set the value of TOOLDIR to tools. If set, the bootstrap 458 ``make'' will only be rebuilt as needed (when the source files 459 for make(1) change). 460 461 -U Set the UNPRIVED variable. 462 463 The "nbmake-MACHINE" wrapper script 464 If using the build.sh script to build NetBSD, a nbmake-MACHINE script 465 will be created in TOOLDIR/bin upon the first build to assist in building 466 subtrees on a cross-compile host. 467 468 nbmake-MACHINE can be invoked in lieu of make(1), and will instead call 469 the up-to-date version of ``nbmake'' installed into TOOLDIR/bin with sev- 470 eral key variables pre-set, including MACHINE, MACHINE_ARCH, and TOOLDIR. 471 This script can be symlinked into a directory listed in PATH, or called 472 with an absolute path. 473 474 SEE ALSO 475 make(1), hier(7), release(7) 476 477 HISTORY 478 The USE_NEW_TOOLCHAIN based build scheme was introduced in the ``NetBSD- 479 current'' development sources between NetBSD 1.5 and NetBSD 1.6. 480 481 BUGS 482 Many platforms are not yet using the USE_NEW_TOOLCHAIN system. 483 484 NetBSD March 4, 2002 8 485
Indexes created Fri Oct 10 14:10:03 GMT 2025