Simplify maintenance of NO_BUILD_TEST_PREREQ CI hack

Our split between build and test phases in CI triggers odd corner case
in Meson:
- Newer Meson versions (1.7.0+) do not build test targets as part of
  "all" target.
- We copy build artifacts from build phase into test container.
- meson test --no-rebuild does not build test artifacts even if they are
  missing.
- To build these test binaries Meson has special target
  "meson-test-prereq". This target exists only in Meson >= 0.63.
- Ubuntu 22.04 has only Meson 0.61.2 so this target does not exist.

To counter this problem, we introduced BUILD_TEST_PREREQ variable in CI
to explicitly build "meson-test-prereq" target in the "build" phase only
inside images with new-enough Meson versions. This worked, but it forced
us to keep track of Meson versions on various
distros and update the variable accordingly.

This commit inverts the logic so we build the special target by default
(in the build phase) and skip building it only if Meson version is too
old. So once we drop the old image, the variable (or rather it's usage)
will be gone and we don't need to touch it for newer images.

We have also considered installing newer Meson into the test image, but
decided to keep the old version around so we can test minimal Meson
version specified in meson.build file.

diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index bb4fc8b29c7605a738bd76802e66623a10419a46..ca6d4661f2476fda93f3f3069152bc45615f639b 100644 (file)
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -336,7 +336,7 @@ stages:
     - *check_readline_setup
     - meson compile -C build
     - meson compile -C build system-test-dependencies
-    - test -z "${BUILD_TEST_PREREQ}" || ninja -C build meson-test-prereq
+    - test -z "${NO_BUILD_TEST_PREREQ}" && ninja -C build meson-test-prereq
     - test -z "${RUN_MESON_INSTALL}" || meson install -C build --destdir=$INSTALL_PATH
     - test -z "${RUN_MESON_INSTALL}" || DESTDIR="${INSTALL_PATH}" sh build/util/check-make-install
     #- test -z "${CROSS_COMPILATION}" || grep -F -A 1 "checking whether we are cross compiling" config.log | grep -q "result.*yes"
@@ -753,7 +753,6 @@ docs:tarball:
 
 gcc:alpine3.22:amd64:
   variables:
-    BUILD_TEST_PREREQ: 1
     CC: gcc
     CFLAGS: "${CFLAGS_COMMON}"
     EXTRA_CONFIGURE: "${WITHOUT_LIBEDIT}"
@@ -828,7 +827,6 @@ unit:gcc:almalinux9:amd64:
 
 gcc:8fips:amd64:
   variables:
-    BUILD_TEST_PREREQ: 1
     CC: gcc
     CFLAGS: "${CFLAGS_COMMON}"
     EXTRA_CONFIGURE: "-Didn=enabled -Dfips=enabled -Dtracing=disabled"
@@ -975,7 +973,6 @@ gcc:ossl3:sid:amd64:
   <<: *debian_sid_amd64_image
   <<: *build_job
   variables:
-    BUILD_TEST_PREREQ: 1
     CC: gcc
     CFLAGS: "${CFLAGS_COMMON} -DOPENSSL_NO_DEPRECATED=1 -DOPENSSL_API_COMPAT=30000"
     # See https://gitlab.isc.org/isc-projects/bind9/-/issues/3444
@@ -1011,7 +1008,6 @@ gcc:sid:amd64:
     CFLAGS: "${CFLAGS_COMMON}"
     EXTRA_CONFIGURE: "-Doptimization=3 -Didn=enabled -Dlmdb=disabled ${WITH_LIBEDIT}"
     RUN_MESON_INSTALL: 1
-    BUILD_TEST_PREREQ: 1
 
 system:gcc:sid:amd64:
   <<: *debian_sid_amd64_image
@@ -1075,7 +1071,6 @@ gcc:tumbleweed:amd64:
     CC: gcc
     CFLAGS: "${CFLAGS_COMMON} -DDEBUG"
     EXTRA_CONFIGURE: "-Didn=enabled -Dgssapi=disabled ${WITH_LIBEDIT}"
-    BUILD_TEST_PREREQ: 1
 
 system:gcc:tumbleweed:amd64:
   <<: *tumbleweed_latest_amd64_image
@@ -1098,6 +1093,7 @@ gcc:jammy:amd64:
     CC: gcc
     CFLAGS: "${CFLAGS_COMMON}"
     EXTRA_CONFIGURE: "-Dgeoip=disabled -Didn=enabled -Ddoh=disabled -Dcmocka=disabled -Ddnstap=disabled -Dgssapi=disabled"
+    NO_BUILD_TEST_PREREQ: 1  # remove this variable after removing this particular distro
   <<: *ubuntu_jammy_amd64_image
   <<: *build_job
 
@@ -1148,7 +1144,6 @@ gcc:asan:
     CC: gcc
     CFLAGS: "${CFLAGS_COMMON}"
     EXTRA_CONFIGURE: "-Db_sanitize=address,undefined -Didn=enabled -Djemalloc=disabled -Dtracing=disabled"
-    BUILD_TEST_PREREQ: 1
   <<: *fedora_42_amd64_image
   <<: *build_job
 
@@ -1202,7 +1197,6 @@ gcc:tsan:
     CFLAGS: "${CFLAGS_COMMON} -Wno-stringop-overread"
     LDFLAGS: "-Wl,--disable-new-dtags"
     EXTRA_CONFIGURE: "${TSAN_CONFIGURE_FLAGS_COMMON}"
-    BUILD_TEST_PREREQ: 1
   <<: *tsan_fedora_42_amd64_image
   <<: *build_job