meson: Convert CMake to Meson build infrastructure

Provide infrastructure to be able to build the uvc-gadget library as a
shared object and an executable which links against this as a dependency
to implment the reference 'uvc-gadget' application.

All existing cmake infrastructure is removed. This removes custom glob
support that was previously used by an early development for Android,
which is expected to be re-added later when required.

Reviewed-by: Daniel Scally <dan.scally@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

1 files changed, 58 insertions, 0 deletions

diff --git a/meson.build b/meson.build
new file mode 100644
index 0000000..5a9d3fb
--- /dev/null
+++ b/meson.build
@@ -0,0 +1,58 @@
+# SPDX-License-Identifier: CC0-1.0
+
+project('uvc-gadget', 'c',
+    meson_version : '>= 0.56',
+    version : '0.0.0',
+    default_options : [
+        'werror=true',
+        'warning_level=2',
+    ],
+    license : 'LGPL 2.1+')
+
+# Generate version information. The uvc_gadget_git_version variable contains the
+# full version with git patch count and SHA1 (e.g. 1.2.3+211-c94a24f4), while
+# the uvc_gadget_version variable contains the major.minor.patch (e.g. 1.2.3)
+# only. If the source tree isn't under git control, or if it matches the last
+# git version tag, the build metadata (e.g. +211-c94a24f4) is omitted from
+# uvc_gadget_git_version.
+uvc_gadget_git_version = run_command('scripts/gen-version.sh',
+                                    meson.project_build_root(),
+                                    meson.project_source_root(),
+                                    check: false).stdout().strip()
+if uvc_gadget_git_version == ''
+    uvc_gadget_git_version = meson.project_version()
+endif
+
+uvc_gadget_version = uvc_gadget_git_version.split('+')[0]
+
+# A shallow clone, or a clone without a reachable tag equivalent to the
+# meson.project_version() could leave the project in a mis-described state.
+# Produce a warning in this event, and fix to a best effort.
+if uvc_gadget_version != meson.project_version()
+    warning('The sources disagree about the version: '
+            + uvc_gadget_version + ' != ' + meson.project_version())
+
+    summary({'uvc-gadget git version' : uvc_gadget_git_version,
+             'Source version match' : false,
+            },
+            bool_yn : true, section : 'Versions')
+
+    # Replace the version components reported by git with the release version,
+    # but keep all trailing information supplied by git.
+    uvc_gadget_git_version = (meson.project_version() +
+                              uvc_gadget_git_version.strip(uvc_gadget_version))
+    uvc_gadget_version = meson.project_version()
+
+    # Append a marker to show we have modified this version string
+    uvc_gadget_git_version += '-nvm'
+endif
+
+summary({ 'Sources': uvc_gadget_git_version, }, section : 'Versions')
+
+# Configure the build environment.
+cc = meson.get_compiler('c')
+
+subdir('include')
+
+subdir('lib')
+subdir('src')