libcamera: Enable vimc pipeline handler when tests are enabled

The addition of the new IPA IPC mechanism compiles pipeline-specific
headers to define the interface between the pipeline and the IPA.

This was optimised in 08ce394465 ("meson: ipa, proxy: Only build
proxies for enabled pipelines") to only build for enabled pipelines,
however the tests directly use the VIMC pipeline handler, and require
it to be built.

Create a local variable to store the requested pipelines from the user
configuration and extend the enabled pipelines to ensure that VIMC is
always enabled if the tests are also enabled

Fixes: 08ce394465 ("meson: ipa, proxy: Only build proxies for enabled pipelines")
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Tested-by: Sebastian Fricke<sebastian.fricke@posteo.net>

include/libcamera/ipa/meson.build

@@ -72,7 +72,7 @@ ipa_mojoms = []
 foreach file : ipa_mojom_files
     name = file.split('.')[0]
 
-    if not get_option('pipelines').contains(name)
+    if name not in pipelines
         continue
     endif
 

meson.build

@@ -111,6 +111,17 @@ py_modules = []
 # Libraries used by multiple components
 liblttng = cc.find_library('lttng-ust', required : get_option('tracing'))
 
+# Pipeline handlers
+#
+# Tests require the vimc pipeline handler, include it automatically when tests
+# are enabled.
+pipelines = get_option('pipelines')
+
+if get_option('test') and 'vimc' not in pipelines
+    message('Enabling vimc pipeline handler to support tests')
+    pipelines += ['vimc']
+endif
+
 # Utilities are parsed first to provide support for other components.
 subdir('utils')
 
@@ -156,5 +167,5 @@ py_mod.find_installation('python3', modules: py_modules)
 
 ## Summarise Configurations
 summary({
-            'Enabled pipelines': get_option('pipelines'),
+            'Enabled pipelines': pipelines,
         }, section : 'Configuration')

src/ipa/meson.build

@@ -22,7 +22,7 @@ ipa_sign = files('ipa-sign.sh')
 ipas = ['ipu3', 'raspberrypi', 'rkisp1', 'vimc']
 ipa_names = []
 
-foreach pipeline : get_option('pipelines')
+foreach pipeline : pipelines
     if ipas.contains(pipeline)
         subdir(pipeline)
         ipa_names += join_paths(ipa_install_dir, ipa_name + '.so')

src/libcamera/pipeline/meson.build

@@ -1,5 +1,5 @@
 # SPDX-License-Identifier: CC0-1.0
 
-foreach pipeline : get_option('pipelines')
+foreach pipeline : pipelines
     subdir(pipeline)
 endforeach