CI: Stop building QEMU in general

We spend an awful lot of CI time building QEMU, even though most changes don't
touch the subset of tools/libs/ used by QEMU.  Some numbers taken at a time
when CI was otherwise quiet:

                       With     Without
  Alpine:              13m38s   6m04s
  Debian 12:           10m05s   8m10s
  OpenSUSE Tumbleweed: 11m40s   7m54s
  Ubuntu 24.04:        14m56s   8m06s

which is a >50% improvement in wallclock time in some cases.

The only build we have that needs QEMU is alpine-3.18-gcc-debug.  This is the
build deployed and used by the QubesOS ADL-* and Zen3p-* jobs.

Xilinx-x86_64 deploys it too, but is PVH-only and doesn't use QEMU.

QEMU is also built by CirrusCI for FreeBSD (fully Clang/LLVM toolchain).

This should help quite a lot with Gitlab CI capacity.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
(cherry picked from commit e305256e69b1c943db3ca20173da6ded3db2d252)

diff --git a/automation/gitlab-ci/build.yaml b/automation/gitlab-ci/build.yaml
index 33590329b972dd069103dce8b01ec9c76874bce5..1b27e5c01b756db1a4bccd7e27a92959a10478de 100644 (file)
--- a/automation/gitlab-ci/build.yaml
+++ b/automation/gitlab-ci/build.yaml
@@ -434,6 +434,7 @@ alpine-3.12-gcc-debug:
   extends: .gcc-x86-64-build-debug
   variables:
     CONTAINER: alpine:3.12
+    BUILD_QEMU_XEN: y
 
 alpine-3.12-clang:
   extends: .clang-x86-64-build

diff --git a/automation/scripts/build b/automation/scripts/build
index 5dafa72ba540304a27372aa14eb44335a46b6486..ca444674cc66078e2e4eae4d70e279b27adc8df4 100755 (executable)
--- a/automation/scripts/build
+++ b/automation/scripts/build
@@ -59,9 +59,8 @@ if ! test -z "$(ldd /bin/ls|grep musl|head -1)"; then
     cfgargs+=("--with-system-seabios=/bin/false")
 fi
 
-# Qemu requires Python 3.5 or later, and ninja
-if ! type python3 || python3 -c "import sys; res = sys.version_info < (3, 5); exit(not(res))" \
-        || ! type ninja; then
+# QEMU is only for those who ask
+if [[ "$BUILD_QEMU_XEN" != "y" ]]; then
     cfgargs+=("--with-system-qemu=/bin/false")
 fi