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Commit b817bcec6b53 ("libcamera: Auto generate version information")
generates version information in order to automatically include it
various locations (Sphinx and Doxygen documentation, libcamera::version
variable available at runtime, and version.h available at compile time).
Unfortunately this causes lots of unnecessary rebuilds when modifying
the git tree state, which hinders development.
The problem is caused by the generated version.h being listed as a
dependency for the whole libcamera. This is required as meson (to the
best of my knowledge) doesn't provide a way to explicitly specify the
dependency of a single object file (camera_manager.o in this case, as
camera_manager.cpp is the only consumer of the generated version string)
on the custom target used to generate version.h. The dependency can't be
automatically detected at build time, like dependencies on normal
headers that are generated by parsing the source, because the version.h
header may not exist yet. The build could then fail in a racy way.
This change attempts at solving the issue by generating a version.cpp
instead of a version.h to set the git-based version. This minimises the
number of files that need to be rebuild when then git tree state
changes, while retaining the main purpose of the original automatic
version generation, the ability to access the git-based version string
at runtime. We however lose the ability to access git-based version
information at build time in an application building against libcamera,
but there is no expected use case for this.
The version string is moved from the libcamera namespace to the
CameraManager class in order to avoid including version.h inside
libcamera (in version.cpp and in camera_manager.cpp), which would create
dependencies causing more rebuild steps, as described above.
On the other hand, major, minor and patch level version numbers are
useful at build time. This commit changes the generation of version.h in
order to add three macros named LIBCAMERA_VERSION_MAJOR,
LIBCAMERA_VERSION_MINOR and LIBCAMERA_VERSION_PATCH for this purpose.
version.h is not included by any other libcamera header or source file,
and thus doesn't force a rebuild of the library.
The Sphinx and Doxygen documentation keep their git-based version
information, which is set during the configuration of the build and then
doesn't track git commits. We may want to investigate how to improve
this, but given that git-based version for the documentation has very
few use cases outside of tagging nightly builds, this isn't considered
an issue at the moment.
The documentation install directory now uses the base version string, in
order to avoid increasing the number of documentation directories
needlessly. This shouldn't cause any issue as the API should not change
without a change to the version number.
The version number generation and handling code now also standardises
the version variables to not start with a 'v' prefix in meson, in order
to simplify their handling. The prefix is added when generating the
relevant files.
Note that we go back to specifying the fallback version in the main
meson.build, in the call to the project() function. For the time being I
believe this should be a good compromise to avoid unnecessary
recompilation, and moving the fallback version to a different file for
tarball releases can be built on top of this.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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Generate a version string, and provide a global string object which
allows applications to interrogate the current libcamera version
information.
The version header is automatically updated by meson on each build.
The string roughly follows the semver [0] conventions of
major.minor.patch-label as a value.
[0] https://semver.org/
A script (utils/gen-version.sh) is provided which is modelled upon the
processing from autoconf's git-version-gen. The gen-version.sh script
will look for tags in the form vX.Y as starting points for the version
string. While the repository does not have any matching tags, v0.0 will
be assumed, resulting in versions with both major and minor being set to
'0', and the patch count resulting from the number of patches in the
history to that point.
Finally, a uniquely identifying shortened hash is provided from git:
v0.0.509+0ec0edf7
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
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libc++ is used by Chrome OS, and likely as well by other environments
based on clang. Using it by default if available when compiling with
clang will help extending the compile-testing coverage. The drawback is
that issues specific to clang with libstdc++ will not be caught as
easily, but based on the experience with clang so far, code compiling
correctly with gcc/libstdc++ has failed with clang due to either
clang-specific or libc++-specific behaviour, never due only to the
combination of clang with libstdc++.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
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Consistently go for 4 spaces indentation, and always put a space between
the colon in argument lists, as per the examples from the meson
documentation.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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libcamera depends on libudev for device enumeration. It is however
useful to allow building documentation without requiring the dependency
to be installed. Make the libudev dependency optional and compile the
udev-based device enumerator out when libudev is not present.
Note that while libcamera will compile without libudev, it will not be
able to enumerate devices. A sysfs-based device enumerator is planned as
a fallback but not implemented yet.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
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Not all libc make secure_getenv() available, this could lead to build
failure on certain build systems.
Check if secure_getenv() is available and emit #define
HAVE_SECURE_GETENV to config.h Include config.h to every c/c++ file
during building by adding `-include config.h` to project arguments for
both c and c++.
Signed-off-by: Giulio Benetti <giulio.benetti@micronovasrl.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
[Kieran: Drop unnessecary meson message
Update commit message]
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
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Re-order the optional components to make them alphabetical, and fix up
the indentation to use two spaces as required by meson. A comment is
added to highlight that these optional components are enabled by
default.
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
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It can be desirable to disable the compilation and processing of both
the test suite and documentation for use cases such as packaging to an
embedded target.
Provide a new meson_options.txt file to allow disabling either or both
of the tests and documentation components of libcamera.
These options can be provided at the initial configuration time, for
example:
meson build -Dtests=false -Ddocumentation=false
or by reconfiguring an existing build tree:
cd build
meson configure -Ddocumentation=false
meson configure -Dtests=false
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
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Remove our custom declarations for cpp_std=c++11, -Wall, -Wextra and
-Werror, instead prefering to use the built-in default_option parameters
from meson.
Our custom compiler flags (such as -Wno-unused-parameter) are
maintained.
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
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The project description is really the project name. The extraneosly long
string gets printed at the test runner prefixed to the suite. As such it
should really be the shortened simple project name.
Remove the 'description' from the project naming field.
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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Building the current master branch with g++ 5.4.0-6 fails with:
./src/libcamera/include/log.h:25:34:
error: defaulted and deleted functions only available with -std=c++11 \
or -std=gnu++11 [-Werror]
LogMessage(const LogMessage&) = delete;
Fix this by adding the 'std=c++11' compiler argument for to the list of
cpp build flags.
Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
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Extend the documentation build system to automatically generate
documentation from source code using Doxygen. This is currently separate
from the sphinx documentation, and should be integrated using the
breathe (and possibly exhale) extensions.
As the Documentation/meson.build file needs to reference the variables
holding the source files, move the Documentation directory to the end of
the subdirs() in the top-level meson.build.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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In order to match the directory structure of traditional projects,
rename the top-level lib/ directory to src/libcamera/. Other libraries
developed as part of the project will later find a home in src/.
Split the libcamera header files in three categories: public headers
describing the public API in include/libcamera/, internal headers
describing the internal API in src/libcamera/include/, and private
headers local to one or a small number of compilation units along the
corresponding .cpp files. As no internal header exists yet the
src/libcamera/include/ directory is created empty as the build system
would fail otherwise.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
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We utilise 'add_project_arguments' which is only available in version
0.36 and 'build_by_default' which is only available in version 0.40 of
meson.
Add this dependancy to the project requirements.
Reported-by: Jacopo Mondi <jacopo@mondi.org>
Acked-by: Jacopo Mondi <jacopo@jmondi.org>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
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Utilise sphinx-build to generate documentation in HTML form, and
populate with some initial content.
An initial conf.py is generated from sphinx-quickstart and answering
initial questions.
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
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Add language specific project arguments and ensure that -Werror is
enabled, enforcing code to be as clean as possible.
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
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The include directory was defined but not installed.
Add it to the meson build structure to incorporate it as part of the
library install.
To facilitate the same include paths in our internal includes, update
the structure for headers to match the install structure.
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
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The IPU3 captures Bayer data in a 25-pixels-in-32-bytes packed format,
which no standard tool can process. Add a quick implementation of data
unpacking to turn raw binary files into 16 bits per pixel unpacked Bayer
data.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
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Define the starting points for the libcamera build using
meson and ninja build components.
An initial 'dummy' library class is created, and a test binary links
against the shared library calling it's init_lib() function.
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
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