gitlab-ci: Rename CI config variable to avoid conflict with CMAKE_BUILD_TYPE

Since commit e216b9bbd3 (cmake: Allow CMAKE_BUILD_TYPE to be set by
environment variable, 2021-06-29), the `CMAKE_BUILD_TYPE` environment
variable is interpreted by CMake, and can affect the test suite.
Rename our CI config variable to avoid conflict.

.gitlab/ci/configure_common.cmake

@@ -6,8 +6,8 @@ set(CMAKE_SKIP_INSTALL_ALL_DEPENDENCY "ON" CACHE BOOL "")
 set(CMAKE_INSTALL_PREFIX "${CMAKE_BINARY_DIR}/install" CACHE PATH "")
 set(CMake_TEST_INSTALL "OFF" CACHE BOOL "")
 
-if (NOT "$ENV{CMAKE_BUILD_TYPE}" STREQUAL "")
-  set(CMAKE_BUILD_TYPE "$ENV{CMAKE_BUILD_TYPE}" CACHE STRING "")
+if (NOT "$ENV{CMAKE_CI_BUILD_TYPE}" STREQUAL "")
+  set(CMAKE_BUILD_TYPE "$ENV{CMAKE_CI_BUILD_TYPE}" CACHE STRING "")
 endif ()
 
 if (NOT configure_no_sccache)

.gitlab/ci/gitlab_ci.cmake

@@ -26,8 +26,8 @@ set(CTEST_SITE "gitlab-ci")
 set(ctest_model "Experimental")
 
 # Default to Release builds.
-if (NOT "$ENV{CMAKE_BUILD_TYPE}" STREQUAL "")
-  set(CTEST_BUILD_CONFIGURATION "$ENV{CMAKE_BUILD_TYPE}")
+if (NOT "$ENV{CMAKE_CI_BUILD_TYPE}" STREQUAL "")
+  set(CTEST_BUILD_CONFIGURATION "$ENV{CMAKE_CI_BUILD_TYPE}")
 endif ()
 if (NOT CTEST_BUILD_CONFIGURATION)
   set(CTEST_BUILD_CONFIGURATION "Release")

.gitlab/os-linux.yml

@@ -90,7 +90,7 @@
 
     variables:
         CMAKE_CONFIGURATION: fedora34_clang_analyzer
-        CMAKE_BUILD_TYPE: Debug
+        CMAKE_CI_BUILD_TYPE: Debug
         CTEST_NO_WARNINGS_ALLOWED: 1
         CMake_SKIP_INSTALL: 1
 
@@ -168,7 +168,7 @@
 
 .fedora_memcheck:
     variables:
-        CMAKE_BUILD_TYPE: RelWithDebInfo
+        CMAKE_CI_BUILD_TYPE: RelWithDebInfo
 
 .fedora_asan_addon:
     extends: .fedora_memcheck

.gitlab/os-windows.yml

@@ -28,7 +28,7 @@
         # Debug and RelWithDebinfo build types use the `/Zi` which results in
         # uncacheable compiations.
         # https://github.com/mozilla/sccache/issues/242
-        CMAKE_BUILD_TYPE: Release
+        CMAKE_CI_BUILD_TYPE: Release
         CTEST_NO_WARNINGS_ALLOWED: 1
 
 .windows_vs2019_x64_ninja: