lc-compliance: Build with gtest in subprojects

libgtest-dev is provided as a static library at least by Debian 10.
The compiler and linker to create the static library might be
different from ones used for libcamera. This causes a problem
upon linking.

This puts gtest code to subprojects, builds the code and link it
for lc-compliance. However, libgtest is locally built as a library on
ChromeOS and thus the used compiler and linker are the same as one
used for libcamera. We don't do these on ChromeOS build environment.

Signed-off-by: Hirokazu Honda <hiroh@chromium.org>
Tested-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

README.rst

@@ -99,7 +99,7 @@ for android: [optional]
         libexif-dev libjpeg-dev libyaml-dev
 
 for lc-compliance: [optional]
-        libevent-dev libgtest-dev
+        libevent-dev
 
 Using GStreamer plugin
 ~~~~~~~~~~~~~~~~~~~~~~

src/lc-compliance/meson.build

@@ -1,13 +1,25 @@
 # SPDX-License-Identifier: CC0-1.0
 
 libevent = dependency('libevent_pthreads', required : get_option('lc-compliance'))
-libgtest = dependency('gtest', required : get_option('lc-compliance'))
 
-if not (libevent.found() and libgtest.found())
+if not libevent.found()
     lc_compliance_enabled = false
     subdir_done()
 endif
 
+if get_option('android_platform') == 'cros'
+    libgtest = dependency('gtest', required : get_option('lc-compliance'))
+
+    if not libgtest.found()
+        lc_compliance_enabled = false
+        subdir_done()
+    endif
+
+else
+    libgtest_sp = subproject('gtest')
+    libgtest = libgtest_sp.get_variable('gtest_dep')
+endif
+
 lc_compliance_enabled = true
 
 lc_compliance_sources = files([

subprojects/.gitignore

@@ -1 +1,3 @@
-/libyuv
+/googletest-release*
+/libyuv
+/packagecache

subprojects/gtest.wrap

@@ -0,0 +1,14 @@
+[wrap-file]
+directory = googletest-release-1.11.0
+source_url = https://github.com/google/googletest/archive/release-1.11.0.zip
+source_filename = gtest-1.11.0.zip
+source_hash = 353571c2440176ded91c2de6d6cd88ddd41401d14692ec1f99e35d013feda55a
+patch_filename = gtest_1.11.0-1_patch.zip
+patch_url = https://wrapdb.mesonbuild.com/v2/gtest_1.11.0-1/get_patch
+patch_hash = d38c39184384608b08419be52aed1d0f9d9d1b5ed71c0c35e51cccbdddab7084
+
+[provide]
+gtest = gtest_dep
+gtest_main = gtest_main_dep
+gmock = gmock_dep
+gmock_main = gmock_main_dep