[libcamera-devel] [PATCH v2 2/5] meson: Shared Object version handling

[Kieran Bingham]

The libcamera project is not yet ready to declare ABI nor API stability,
but it will benefit the community to be able to provide more regular
release cycles to determine 'versioned' points of history.

Ideally, these releases will be made at any ABI breakage, but can be
made at arbitary time based points along the way.

To support releases which may not be ABI stable, declare the soversion
of both the libcamera and libcamera-base library to be dependant upon
both the major and minor component of the project version.

As part of this, introduce a new 'Versions' summary section to highlight
the different version components that may become apparent within any
given build.

Reviewed-by: Jacopo Mondi <jacopo at jmondi.org>
Signed-off-by: Kieran Bingham <kieran.bingham at ideasonboard.com>
---
 Documentation/Doxyfile.in      |  4 +++-
 meson.build                    | 15 +++++++++++++++
 src/libcamera/base/meson.build |  1 +
 src/libcamera/meson.build      |  1 +
 4 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/Documentation/Doxyfile.in b/Documentation/Doxyfile.in
index 88dfcddaebf6..761807005294 100644
--- a/Documentation/Doxyfile.in
+++ b/Documentation/Doxyfile.in
@@ -46,7 +46,9 @@ EXCLUDE                = @TOP_SRCDIR@/include/libcamera/base/span.h \
                          @TOP_BUILDDIR@/include/libcamera/internal/tracepoints.h \
                          @TOP_BUILDDIR@/src/libcamera/proxy/
 
-EXCLUDE_PATTERNS       = @TOP_BUILDDIR@/include/libcamera/ipa/*_serializer.h \
+EXCLUDE_PATTERNS       = @TOP_BUILDDIR@/src/libcamera/libcamera.so* \
+                         @TOP_BUILDDIR@/src/libcamera/base/libcamera-base.so* \
+                         @TOP_BUILDDIR@/include/libcamera/ipa/*_serializer.h \
                          @TOP_BUILDDIR@/include/libcamera/ipa/*_proxy.h \
                          @TOP_BUILDDIR@/include/libcamera/ipa/ipu3_*.h \
                          @TOP_BUILDDIR@/include/libcamera/ipa/raspberrypi_*.h \
diff --git a/meson.build b/meson.build
index 2c6173b4f97e..2a7b90133bbd 100644
--- a/meson.build
+++ b/meson.build
@@ -26,6 +26,21 @@ endif
 
 libcamera_version = libcamera_git_version.split('+')[0]
 
+# Enforce Major and Minor as part of the soversion. Until we make a first major
+# release and remain on version 0.x, each release may denote ABI instabilty.
+# We can continue to consider that a patch level increment should be
+# compatible.
+project_version = meson.project_version().split('.')
+libcamera_soversion = project_version[0] + '.' + project_version[1]
+
+summary({
+            'Project': meson.project_version(),
+            'Sources': libcamera_git_version,
+            'libcamera': libcamera_version,
+            'soname': libcamera_soversion,
+        },
+        section : 'Versions')
+
 # This script generates the .tarball-version file on a 'meson dist' command.
 meson.add_dist_script('utils/run-dist.sh')
 
diff --git a/src/libcamera/base/meson.build b/src/libcamera/base/meson.build
index 3b9d74efe935..65933905a5df 100644
--- a/src/libcamera/base/meson.build
+++ b/src/libcamera/base/meson.build
@@ -51,6 +51,7 @@ libcamera_base_args = [ '-DLIBCAMERA_BASE_PRIVATE' ]
 libcamera_base_lib = shared_library('libcamera-base',
                                     [libcamera_base_sources, libcamera_base_headers],
                                     version : libcamera_version,
+                                    soversion : libcamera_soversion,
                                     name_prefix : '',
                                     install : true,
                                     cpp_args : libcamera_base_args,
diff --git a/src/libcamera/meson.build b/src/libcamera/meson.build
index 63b47b177fd2..f905c15ece85 100644
--- a/src/libcamera/meson.build
+++ b/src/libcamera/meson.build
@@ -160,6 +160,7 @@ libcamera_deps = [
 libcamera = shared_library('libcamera',
                            libcamera_sources,
                            version : libcamera_version,
+                           soversion : libcamera_soversion,
                            name_prefix : '',
                            install : true,
                            include_directories : includes,
-- 
2.34.1