[CI] [PATCH v1 1/2] Add compilation test with C++20

[Laurent Pinchart]

libcamera currently uses C++17, but we want to prepare for a switch to
C++20 in the somehow distant future. Avoid C++20 regressions by adding a
compilation test with C++20. Do so with g++ 13, which is the most likely
version of g++ to support this newer language version properly.

Signed-off-by: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
---
 gitlab-ci.yml | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/gitlab-ci.yml b/gitlab-ci.yml
index 3dcb512525ed..225d929bd2ed 100644
--- a/gitlab-ci.yml
+++ b/gitlab-ci.yml
@@ -185,10 +185,17 @@ build-full:debian:13:
   needs:
     - job: container-debian:13
       artifacts: false
-  variables:
-    ARCH: amd64
-    CC: gcc-13
-    CXX: g++-13
+  parallel:
+    matrix:
+      - ARCH: amd64
+        CC: gcc-13
+        CXX: g++-13
+      - ARCH: amd64
+        CC: gcc-13
+        CXX: g++-13
+        MESON_OPTIONS: >-
+          ${MESON_ALL_OPTIONS}
+          -D cpp_std=c++20
 
 # Build each commit in the branch individually to detect compilation breakages.
 build-history:
-- 
Regards,

Laurent Pinchart