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Diffstat (limited to 'dev')
| -rw-r--r-- | dev/packaging/tutorials/basic.mdwn | 97 |
1 files changed, 97 insertions, 0 deletions
diff --git a/dev/packaging/tutorials/basic.mdwn b/dev/packaging/tutorials/basic.mdwn index f8a3ee9..263fd0d 100644 --- a/dev/packaging/tutorials/basic.mdwn +++ b/dev/packaging/tutorials/basic.mdwn @@ -97,8 +97,101 @@ Our expat `changelog` file looks like this: -- "J. Random Hacker" <jrandom@example.com> Sun, 18 Nov 2012 11:58:19 -0500 + +Building the Software +===================== + +We can now write our `build` makefile to try to get the Expat software to build. +[The `build` makefile][spf-build] "directs the process of building and +installing data files to be provided by binary packages". + +Looking Through the Source +-------------------------- + +With a ["no-op"][no-op] target in `build`, we can make **opkbuild**(1) prepare a +[work area][spf-work-area] with the unpacked source code and stop. So begin +writing `build` as follows: + + #!/usr/bin/make -f + + nop: + @: + +Note that, due to makefile syntax, the line after `nop:` must begin with a tab +character. This line is called a "command line" in makefile syntax. The [`:` +utility][posix-colon] is a "null utility" that returns an exit status of zero. +A command prefix of `@` tells make to not write the command to standard output +before executing it. + +The `build` makefile must be executable, so set its file mode: + + $ chmod 755 build + +We can now make **opkbuild**(1) prepare our build work area. + + $ opkbuild -b -c -T nop + +The options are explained in the help output of opkbuild, obtained by running +`opkbuild -h`. The `-b` option tells **opkbuild**(1) to build only binary +packages (no source package). The `-c` option tells it to not clean up the work +area after building packages. The `-T` option specifies a target to be built +instead of the standard `build` and `install` targets. + +Now look in `tmp/src/`, the location of the source code within the build work +area. + + $ ls tmp/src/ + +Look for some documentation file that might tell us how to build Expat. This +kind of information is usually kept in a file called `INSTALL` or `README`. +Expat's `README` file says to run `./configure`, then `make` and `make install`. + +Looking at `tmp/src/configure`, we see that it is "[g]enerated by GNU Autoconf +2.68 for expat 2.1.0". The `tmp/src/README` file reports that the makefile +supports the use of either the `DESTDIR` or `INSTALL_ROOT` macro to install +Expat somewhere other than in the root of the filesystem. So, we should be able +to use opkhelper's buildsystem utilities to automatically configure, build, and +install Expat for us. + +Building +-------- + +So let's add a `build` target to our `build` makefile. The makefile should now +look like this: + + #!/usr/bin/make -f + + nop: + @: + + build: + oh-autoconfigure + oh-autobuild + touch $@ + + install: build + oh-autoinstall + +Read the manual pages and/or source code of **oh-autoconfigure**(1), +**oh-autobuild**(1), and **oh-autoinstall**(1) to learn more about what they do. + +The `touch $@` command is recommended by SPF 2.0: + +> The build target should create a file named build in the build work area to +> prevent configuration and compilation from being performed multiple times. + +The `install` target is declared as depending on the `build` target: + + install: build + +We can now build Expat. + + $ opkbuild -b -c -T build + + TODO: Finish. + [opkbuild]: http://git.os.libiquity.com/opkbuild/opkbuild.git/ [spf]: http://specs.os.libiquity.com/spf-2.0/ [opkhelper]: http://git.os.libiquity.com/opkhelper/opkhelper.git/ @@ -111,3 +204,7 @@ TODO: Finish. [spf-fields-src]: http://specs.os.libiquity.com/spf-2.0/fields.html#fields-src [rfc-5322-3.4]: https://tools.ietf.org/html/rfc5322#section-3.4 [spf-changelog]: http://specs.os.libiquity.com/spf-2.0/metadata.html#changelog +[spf-build]: http://specs.os.libiquity.com/spf-2.0/buildsys.html#build +[no-op]: https://en.wiktionary.org/wiki/no-op +[spf-work-area]: http://specs.os.libiquity.com/spf-2.0/buildsys.html#work-area +[posix-colon]: http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#colon |