support/dependencies: introduce BR2_HOST_CMAKE_AT_LEAST
Some packages (e.g. libjxl) requires a quite recent cmake version,
that is not yet available in most distributions, especially those
LTS versions.
Currently, when we bump the minimum cmake version we require, it gets
bumped for all packages, regardless of their own minimum required
version, which means that a given configuration will trigger the
build of our host-cmake even if the packages that require it are not
enabled and those that are would be content with the system-provided
cmake.
Since host-cmake can take quite some time to build, this can get a
bit annoying to pay the price of a host-cmake build that would
otherwise not be needed.
Some packages even use an alternative build system when available
since they requires a more recent version of cmake than the our
minimum cmake version
(wpewebkit use Ninja: 78d499409f71d8a22b0632c8ebc06f67ee6ae6dd).
We introduce config options that packages can select to indicate
what minimal cmake version they require, and use that version as the
required minimal version required by the current configuration [0].
We would like to ensure that the currently selected minimum cmake
version is indeed lower (or equal) to the cmake version we package,
but that is not possible: dependencies.mk is parsed before we parse
packages, so we do not yet know the cmake version we have, and we
can't invert the parsing order as we need to know the required
dependencies before we parse packages (so that we can build their
dependency rules in Makefile). So we can only add comments in both
places, that refer to the other location.
[0] note that this is yet not optimal, as in such a case, host-cmake
would be in the dependency chain of all cmake-based packages, even
for those packages that do not require it. The optimum would be for
each package to gain such a dependency on an as-needed basis, but
this is by far more complex to achieve, and would only speed up
cases where a single package is built from scratch (e.g. with:
make clean; make foo), which is not worth optimising (yet?)
Signed-off-by: Romain Naour <romain.naour@gmail.com>
Cc: Julien Olivain <ju.o@free.fr>
Cc: Arnout Vandecappelle <arnout@mind.be>
Cc: Peter Korsgaard <peter@korsgaard.com>
Cc: Yann E. MORIN <yann.morin.1998@free.fr>
Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
2023-06-05 11:56:06 +02:00
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# The cmake minimum version is set to either 3.18 or higher,
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# depending on the highest minimum version required by any
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# of the packages bundled in Buildroot. If a package is
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# bumped or a new one added, and it requires a higher
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# cmake version than the one provided by the host, our
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# cmake infra will catch it and build its own.
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core: don't build host-cmake if it is available on the build host
Currently all cmake packages depend on host-cmake. Unfortunately
host-cmake takes a long time to configure and build: almost 7 minutes
on a dual-core i5 with SSD. The time does not change even with ccache
enabled.
Indeed, building host-cmake is avoidable if it is already installed on
the build host: CMake is supposed to be quite portable, and the only
patch in Buildroot for the CMake package seems to only affect
target-cmake.
Thus we automatically skip building host-cmake and use the one on the
system if:
- cmake is available on the system and
- it is recent enough.
First, we leverage the existing infrastructure in
support/dependencies/dependencies.mk to find out whether there's a
suitable cmake executable on the system. Its path can be passed in the
BR2_CMAKE environment variable, otherwise it defaults to "cmake". If
it is enabled, found and suitable then we set BR2_CMAKE_HOST_DEPENDENCY
to empty; otherwise we set BR2_CMAKE_HOST_DEPENDENCY to 'host-cmake' and
override BR2_CMAKE with "$(HOST_DIR)/usr/bin/cmake" to revert to using
our own cmake (the old behaviour).
Then in pkg-cmake.mk we replace the hard-coded dependency on host-cmake
to using the BR2_CMAKE_HOST_DEPENDENCY variable, and we use $(BR2_CMAKE)
instead of $(HOST_DIR)/usr/bin/cmake.
Unlike what we do for host-tar and host-xzcat, for host-cmake we do
not add host-cmake to DEPENDENCIES_HOST_PREREQ. If we did, host-cmake
would be a dependency for _any_ package when it's not installed on the
host, even when no cmake package is selected.
Cmake versions older than 3.0 are affected by the bug described and
fixed in Buildroot in ef2c1970e4bf ("cmake: add patch to fix Qt mkspecs
detection"). The bug was fixed in upstream CMake in version 3.0 [0].
Amongst all the cmake packages currently in Buildroot, the currently
highest version mentioned in cmake_minimum_required() is 3.1 (grantlee
and opencv3).
Thus we use 3.1 as the lowest required cmake for now, until a package is
bumped, or a new package added, with a higher required version.
[0] https://cmake.org/gitweb?p=cmake.git;h=e8b8b37ef6fef094940d3384df5a1d421b9fa568
Signed-off-by: Luca Ceresoli <luca@lucaceresoli.net>
Cc: Samuel Martin <s.martin49@gmail.com>
Cc: Davide Viti <zinosat@tiscali.it>
Cc: Arnout Vandecappelle <arnout@mind.be>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Reviewed-by: Romain Naour <romain.naour@gmail.com>
Tested-by: Romain Naour <romain.naour@gmail.com>
[yann.morin.1998@free.fr:
- simplify logic in check-host-cmake.mk;
- set and use BR2_CMAKE_HOST_DEPENDENCY, drop USE_SYSTEM_CMAKE;
- bump to cmake 3.1 for grantlee and opencv;
]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
2016-09-12 23:59:19 +02:00
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#
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support/dependencies: introduce BR2_HOST_CMAKE_AT_LEAST
Some packages (e.g. libjxl) requires a quite recent cmake version,
that is not yet available in most distributions, especially those
LTS versions.
Currently, when we bump the minimum cmake version we require, it gets
bumped for all packages, regardless of their own minimum required
version, which means that a given configuration will trigger the
build of our host-cmake even if the packages that require it are not
enabled and those that are would be content with the system-provided
cmake.
Since host-cmake can take quite some time to build, this can get a
bit annoying to pay the price of a host-cmake build that would
otherwise not be needed.
Some packages even use an alternative build system when available
since they requires a more recent version of cmake than the our
minimum cmake version
(wpewebkit use Ninja: 78d499409f71d8a22b0632c8ebc06f67ee6ae6dd).
We introduce config options that packages can select to indicate
what minimal cmake version they require, and use that version as the
required minimal version required by the current configuration [0].
We would like to ensure that the currently selected minimum cmake
version is indeed lower (or equal) to the cmake version we package,
but that is not possible: dependencies.mk is parsed before we parse
packages, so we do not yet know the cmake version we have, and we
can't invert the parsing order as we need to know the required
dependencies before we parse packages (so that we can build their
dependency rules in Makefile). So we can only add comments in both
places, that refer to the other location.
[0] note that this is yet not optimal, as in such a case, host-cmake
would be in the dependency chain of all cmake-based packages, even
for those packages that do not require it. The optimum would be for
each package to gain such a dependency on an as-needed basis, but
this is by far more complex to achieve, and would only speed up
cases where a single package is built from scratch (e.g. with:
make clean; make foo), which is not worth optimising (yet?)
Signed-off-by: Romain Naour <romain.naour@gmail.com>
Cc: Julien Olivain <ju.o@free.fr>
Cc: Arnout Vandecappelle <arnout@mind.be>
Cc: Peter Korsgaard <peter@korsgaard.com>
Cc: Yann E. MORIN <yann.morin.1998@free.fr>
Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
2023-06-05 11:56:06 +02:00
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BR2_CMAKE_VERSION_MIN = $(BR2_HOST_CMAKE_AT_LEAST)
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core: don't build host-cmake if it is available on the build host
Currently all cmake packages depend on host-cmake. Unfortunately
host-cmake takes a long time to configure and build: almost 7 minutes
on a dual-core i5 with SSD. The time does not change even with ccache
enabled.
Indeed, building host-cmake is avoidable if it is already installed on
the build host: CMake is supposed to be quite portable, and the only
patch in Buildroot for the CMake package seems to only affect
target-cmake.
Thus we automatically skip building host-cmake and use the one on the
system if:
- cmake is available on the system and
- it is recent enough.
First, we leverage the existing infrastructure in
support/dependencies/dependencies.mk to find out whether there's a
suitable cmake executable on the system. Its path can be passed in the
BR2_CMAKE environment variable, otherwise it defaults to "cmake". If
it is enabled, found and suitable then we set BR2_CMAKE_HOST_DEPENDENCY
to empty; otherwise we set BR2_CMAKE_HOST_DEPENDENCY to 'host-cmake' and
override BR2_CMAKE with "$(HOST_DIR)/usr/bin/cmake" to revert to using
our own cmake (the old behaviour).
Then in pkg-cmake.mk we replace the hard-coded dependency on host-cmake
to using the BR2_CMAKE_HOST_DEPENDENCY variable, and we use $(BR2_CMAKE)
instead of $(HOST_DIR)/usr/bin/cmake.
Unlike what we do for host-tar and host-xzcat, for host-cmake we do
not add host-cmake to DEPENDENCIES_HOST_PREREQ. If we did, host-cmake
would be a dependency for _any_ package when it's not installed on the
host, even when no cmake package is selected.
Cmake versions older than 3.0 are affected by the bug described and
fixed in Buildroot in ef2c1970e4bf ("cmake: add patch to fix Qt mkspecs
detection"). The bug was fixed in upstream CMake in version 3.0 [0].
Amongst all the cmake packages currently in Buildroot, the currently
highest version mentioned in cmake_minimum_required() is 3.1 (grantlee
and opencv3).
Thus we use 3.1 as the lowest required cmake for now, until a package is
bumped, or a new package added, with a higher required version.
[0] https://cmake.org/gitweb?p=cmake.git;h=e8b8b37ef6fef094940d3384df5a1d421b9fa568
Signed-off-by: Luca Ceresoli <luca@lucaceresoli.net>
Cc: Samuel Martin <s.martin49@gmail.com>
Cc: Davide Viti <zinosat@tiscali.it>
Cc: Arnout Vandecappelle <arnout@mind.be>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Reviewed-by: Romain Naour <romain.naour@gmail.com>
Tested-by: Romain Naour <romain.naour@gmail.com>
[yann.morin.1998@free.fr:
- simplify logic in check-host-cmake.mk;
- set and use BR2_CMAKE_HOST_DEPENDENCY, drop USE_SYSTEM_CMAKE;
- bump to cmake 3.1 for grantlee and opencv;
]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
2016-09-12 23:59:19 +02:00
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2017-05-07 06:32:21 +02:00
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BR2_CMAKE_CANDIDATES ?= cmake cmake3
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2017-05-07 06:32:20 +02:00
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BR2_CMAKE ?= $(call suitable-host-package,cmake,\
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$(BR2_CMAKE_VERSION_MIN) $(BR2_CMAKE_CANDIDATES))
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ifeq ($(BR2_CMAKE),)
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2017-07-05 13:14:19 +02:00
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BR2_CMAKE = $(HOST_DIR)/bin/cmake
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core: don't build host-cmake if it is available on the build host
Currently all cmake packages depend on host-cmake. Unfortunately
host-cmake takes a long time to configure and build: almost 7 minutes
on a dual-core i5 with SSD. The time does not change even with ccache
enabled.
Indeed, building host-cmake is avoidable if it is already installed on
the build host: CMake is supposed to be quite portable, and the only
patch in Buildroot for the CMake package seems to only affect
target-cmake.
Thus we automatically skip building host-cmake and use the one on the
system if:
- cmake is available on the system and
- it is recent enough.
First, we leverage the existing infrastructure in
support/dependencies/dependencies.mk to find out whether there's a
suitable cmake executable on the system. Its path can be passed in the
BR2_CMAKE environment variable, otherwise it defaults to "cmake". If
it is enabled, found and suitable then we set BR2_CMAKE_HOST_DEPENDENCY
to empty; otherwise we set BR2_CMAKE_HOST_DEPENDENCY to 'host-cmake' and
override BR2_CMAKE with "$(HOST_DIR)/usr/bin/cmake" to revert to using
our own cmake (the old behaviour).
Then in pkg-cmake.mk we replace the hard-coded dependency on host-cmake
to using the BR2_CMAKE_HOST_DEPENDENCY variable, and we use $(BR2_CMAKE)
instead of $(HOST_DIR)/usr/bin/cmake.
Unlike what we do for host-tar and host-xzcat, for host-cmake we do
not add host-cmake to DEPENDENCIES_HOST_PREREQ. If we did, host-cmake
would be a dependency for _any_ package when it's not installed on the
host, even when no cmake package is selected.
Cmake versions older than 3.0 are affected by the bug described and
fixed in Buildroot in ef2c1970e4bf ("cmake: add patch to fix Qt mkspecs
detection"). The bug was fixed in upstream CMake in version 3.0 [0].
Amongst all the cmake packages currently in Buildroot, the currently
highest version mentioned in cmake_minimum_required() is 3.1 (grantlee
and opencv3).
Thus we use 3.1 as the lowest required cmake for now, until a package is
bumped, or a new package added, with a higher required version.
[0] https://cmake.org/gitweb?p=cmake.git;h=e8b8b37ef6fef094940d3384df5a1d421b9fa568
Signed-off-by: Luca Ceresoli <luca@lucaceresoli.net>
Cc: Samuel Martin <s.martin49@gmail.com>
Cc: Davide Viti <zinosat@tiscali.it>
Cc: Arnout Vandecappelle <arnout@mind.be>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Reviewed-by: Romain Naour <romain.naour@gmail.com>
Tested-by: Romain Naour <romain.naour@gmail.com>
[yann.morin.1998@free.fr:
- simplify logic in check-host-cmake.mk;
- set and use BR2_CMAKE_HOST_DEPENDENCY, drop USE_SYSTEM_CMAKE;
- bump to cmake 3.1 for grantlee and opencv;
]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
2016-09-12 23:59:19 +02:00
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BR2_CMAKE_HOST_DEPENDENCY = host-cmake
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endif
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