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pkg-cmake: add option to select the Ninja generator

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Cmake supports multiple generators. For now, Buildroot only uses the
venerable "GNU Makefile" generator, which generates Makefiles as the
build backend.

Cmake also has support for Ninja as a build backend, and provides the
corresponding generator. Ninja is a small build system with a focus on
speed. It is mainly used with the meson build system, but also cmake has
very good support for it.

Packages that are selecting Ninja (or over time another generator),
should also use the _BUILD_{ENV,OPTS} variables instead of the _MAKE
variables.

No _INSTALL{,_STAGING,_TARGET}_OPTS used so far, so reuse as cmake install opts:

    $ grep '_INSTALL_OPTS' $(git grep -l -E '\$\(eval \$\((host-)?cmake-package))')
    $ grep '_INSTALL_STAGING_OPTS' $(git grep -l -E '\$\(eval \$\((host-)?cmake-package))')
    $ grep '_INSTALL_TARGET_OPTS' $(git grep -l -E '\$\(eval \$\((host-)?cmake-package))')

The _MAKE_{ENV,OPTS} are copied to _BUILD_{ENV,OPTS}, involved packages:

    $ grep '_MAKE_ENV =' $(git grep -l -E '\$\(eval \$\((host-)?cmake-package))')

    package/netopeer2/netopeer2.mk:NETOPEER2_MAKE_ENV = \
    package/racehound/racehound.mk:RACEHOUND_MAKE_ENV = $(LINUX_MAKE_FLAGS)

    (qt6, webkitgtk, and wpewebkit also match, but already use -Gninja)

    $ grep '_MAKE_OPTS =' $(git grep -l -E '\$\(eval \$\((host-)?cmake-package))')

    package/mariadb/mariadb.mk:HOST_MARIADB_MAKE_OPTS = import_executables
    package/zeek/zeek.mk:HOST_ZEEK_MAKE_OPTS = binpac bifcl

Only "musepack" seems to overwrite MAKE to enforce -j1, so replace it:

    $ grep '_MAKE =' $(git grep -l -E '\$\(eval \$\((host-)?cmake-package))')

    package/musepack/musepack.mk:MUSEPACK_MAKE = $(MAKE1)

Signed-off-by: Thomas Devoogdt <thomas.devoogdt@barco.com>
Reviewed-by: John Keeping <john@metanate.com>
[yann.morin.1998@free.fr:
  - switch to FOO_CMAKE_BACKEND = (make|ninja)
  - use firstword of $(MAKE), not $(BR2_MAKE)
  - explain why we use firstword of $(MAKE)
  - update manual with the three new variables
  - yweak commit log
]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
This commit is contained in:
Thomas Devoogdt
2023-08-02 13:14:44 +02:00
committed by Yann E. MORIN
parent 0fb677c087
commit 4cf79d9b71
3 changed files with 38 additions and 13 deletions
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8
docs/manual/adding-packages-cmake.txt
View File

@@ -91,6 +91,10 @@ typical packages will therefore only use a few of them.
the tree extracted by the tarball. If +HOST_LIBFOO_SUBDIR+ is not
specified, it defaults to +LIBFOO_SUBDIR+.
* +LIBFOO_CMAKE_BACKEND+ specifies the cmake backend to use, one of
`make` (to use the GNU Makefiles generator, the default) or `ninja`
(to use the Ninja generator).
* +LIBFOO_CONF_ENV+, to specify additional environment variables to
pass to CMake. By default, empty.
@@ -107,6 +111,10 @@ typical packages will therefore only use a few of them.
** +BUILD_EXAMPLE+, +BUILD_EXAMPLES+ are disabled;
** +BUILD_TEST+, +BUILD_TESTS+, +BUILD_TESTING+ are disabled.
* +LIBFOO_BUILD_ENV+ and +LIBFOO_BUILD_OPTS+ to specify additional
environment variables, or command line options, to pass to the backend
at build time.
* +LIBFOO_SUPPORTS_IN_SOURCE_BUILD = NO+ should be set when the package
cannot be built inside the source tree but needs a separate build
directory.