7 files changed, 84 insertions, 0 deletions
diff --git a/.gitlab/ci/configure_linux_gcc_cxx_modules_ninja.cmake b/.gitlab/ci/configure_linux_gcc_cxx_modules_ninja.cmake
new file mode 100644
index 0000000000..bf990c8193
--- /dev/null
+++ b/.gitlab/ci/configure_linux_gcc_cxx_modules_ninja.cmake
@@ -0,0 +1,4 @@
+set(CMake_TEST_MODULE_COMPILATION "named,partitions,internal_partitions" CACHE STRING "")
+set(CMake_TEST_MODULE_COMPILATION_RULES "${CMAKE_CURRENT_LIST_DIR}/cxx_modules_rules_gcc.cmake" CACHE STRING "")
+
+include("${CMAKE_CURRENT_LIST_DIR}/configure_external_test.cmake")
diff --git a/.gitlab/ci/configure_linux_gcc_cxx_modules_ninja_multi.cmake b/.gitlab/ci/configure_linux_gcc_cxx_modules_ninja_multi.cmake
new file mode 100644
index 0000000000..bf990c8193
--- /dev/null
+++ b/.gitlab/ci/configure_linux_gcc_cxx_modules_ninja_multi.cmake
@@ -0,0 +1,4 @@
+set(CMake_TEST_MODULE_COMPILATION "named,partitions,internal_partitions" CACHE STRING "")
+set(CMake_TEST_MODULE_COMPILATION_RULES "${CMAKE_CURRENT_LIST_DIR}/cxx_modules_rules_gcc.cmake" CACHE STRING "")
+
+include("${CMAKE_CURRENT_LIST_DIR}/configure_external_test.cmake")
diff --git a/.gitlab/ci/cxx_modules_rules_gcc.cmake b/.gitlab/ci/cxx_modules_rules_gcc.cmake
new file mode 100644
index 0000000000..d800099935
--- /dev/null
+++ b/.gitlab/ci/cxx_modules_rules_gcc.cmake
@@ -0,0 +1,10 @@
+set(CMake_TEST_CXXModules_UUID "a246741c-d067-4019-a8fb-3d16b0c9d1d3")
+
+set(CMAKE_EXPERIMENTAL_CXX_MODULE_DYNDEP 1)
+string(CONCAT CMAKE_EXPERIMENTAL_CXX_SCANDEP_SOURCE
+  "<CMAKE_CXX_COMPILER> <DEFINES> <INCLUDES> <FLAGS> -E -x c++ <SOURCE>"
+  " -MT <DYNDEP_FILE> -MD -MF <DEP_FILE>"
+  " -fmodules-ts -fdep-file=<DYNDEP_FILE> -fdep-output=<OBJECT> -fdep-format=trtbd"
+  " -o <PREPROCESSED_SOURCE>")
+set(CMAKE_EXPERIMENTAL_CXX_MODULE_MAP_FORMAT "gcc")
+set(CMAKE_EXPERIMENTAL_CXX_MODULE_MAP_FLAG "-fmodules-ts -fmodule-mapper=<MODULE_MAP_FILE> -fdep-format=trtbd -x c++")
diff --git a/.gitlab/ci/docker/gcc_cxx_modules/Dockerfile b/.gitlab/ci/docker/gcc_cxx_modules/Dockerfile
new file mode 100644
index 0000000000..e0af0b9f0f
--- /dev/null
+++ b/.gitlab/ci/docker/gcc_cxx_modules/Dockerfile
@@ -0,0 +1,9 @@
+FROM fedora:36
+MAINTAINER Ben Boeckel <ben.boeckel@kitware.com>
+
+# Install build dependencies for packages.
+COPY install_deps.sh /root/install_deps.sh
+RUN sh /root/install_deps.sh
+
+COPY install_gcc.sh /root/install_gcc.sh
+RUN sh /root/install_gcc.sh
diff --git a/.gitlab/ci/docker/gcc_cxx_modules/install_deps.sh b/.gitlab/ci/docker/gcc_cxx_modules/install_deps.sh
new file mode 100755
index 0000000000..2556b54e24
--- /dev/null
+++ b/.gitlab/ci/docker/gcc_cxx_modules/install_deps.sh
@@ -0,0 +1,7 @@
+#!/bin/sh
+
+set -e
+
+dnf install -y --setopt=install_weak_deps=False \
+    gcc-c++ mpfr-devel libmpc-devel isl-devel flex bison file findutils diffutils
+dnf clean all
diff --git a/.gitlab/ci/docker/gcc_cxx_modules/install_gcc.sh b/.gitlab/ci/docker/gcc_cxx_modules/install_gcc.sh
new file mode 100755
index 0000000000..20ea35f6f7
--- /dev/null
+++ b/.gitlab/ci/docker/gcc_cxx_modules/install_gcc.sh
@@ -0,0 +1,26 @@
+#!/bin/sh
+
+set -e
+
+readonly revision="p1689r5-cmake-ci-20220614" # 3075e510e3d29583f8886b95aff044c0474c84a5
+readonly tarball="https://github.com/mathstuf/gcc/archive/$revision.tar.gz"
+
+readonly workdir="$HOME/gcc"
+readonly srcdir="$workdir/gcc"
+readonly builddir="$workdir/build"
+readonly njobs="$( nproc )"
+
+mkdir -p "$workdir"
+cd "$workdir"
+curl -L "$tarball" > "gcc-$revision.tar.gz"
+tar xf "gcc-$revision.tar.gz"
+mv "gcc-$revision" "$srcdir"
+mkdir -p "$builddir"
+cd "$builddir"
+"$srcdir/configure" \
+    --disable-multilib \
+    --enable-languages=c,c++ \
+    --prefix="/opt/gcc-p1689"
+make "-j$njobs"
+make "-j$njobs" install-strip
+rm -rf "$workdir"
diff --git a/.gitlab/os-linux.yml b/.gitlab/os-linux.yml
index 0b2d382e81..6afd299fa4 100644
--- a/.gitlab/os-linux.yml
+++ b/.gitlab/os-linux.yml
@@ -299,6 +299,30 @@
         CMAKE_CONFIGURATION: hip4.2_radeon
         CMAKE_GENERATOR: "Ninja Multi-Config"
 
+### C++ modules
+
+.gcc_cxx_modules_x86_64:
+    image: "kitware/cmake:ci-gcc_cxx_modules-x86_64-2022-06-14"
+
+    variables:
+        GIT_CLONE_PATH: "$CI_BUILDS_DIR/cmake ci"
+        CMAKE_ARCH: x86_64
+        CC: "/opt/gcc-p1689/bin/gcc"
+        CXX: "/opt/gcc-p1689/bin/g++"
+
+.gcc_cxx_modules_ninja:
+    extends: .gcc_cxx_modules_x86_64
+
+    variables:
+        CMAKE_CONFIGURATION: linux_gcc_cxx_modules_ninja
+
+.gcc_cxx_modules_ninja_multi:
+    extends: .gcc_cxx_modules_x86_64
+
+    variables:
+        CMAKE_CONFIGURATION: linux_gcc_cxx_modules_ninja_multi
+        CMAKE_GENERATOR: "Ninja Multi-Config"
+
 ## Tags
 
 .linux_builder_tags: