Add Docker image for RHEL 10 (#59)

This change adds support for RHEL 10. At the moment no gcc-toolsets exist,
and RHEL 10 comes bundled with GCC 14.

Assuming gcc-toolsets will be added in the near future, this change
therefore checks whether the image built is RHEL 9 (in which case it
will install the requested GCC version using the gcc-toolset), or
otherwise will install the default compiler (until some day we can
revert this piece of conditional logic to also use the toolset).

Author: bthomee

.github/workflows/rhel.yml

@@ -48,6 +48,9 @@ jobs:
           - release: 9
             compiler_name: gcc
             compiler_version: 14
+          - release: 10
+            compiler_name: gcc
+            compiler_version: 14
           - release: 9
             compiler_name: clang
             compiler_version: 'any'
@@ -148,6 +151,9 @@ jobs:
           - release: 9
             compiler_name: gcc
             compiler_version: 14
+          - release: 10
+            compiler_name: gcc
+            compiler_version: 14
           - release: 9
             compiler_name: clang
             compiler_version: 'any'

docker/rhel/Dockerfile

@@ -90,26 +90,31 @@ ARG RHEL_VERSION
 # where typically you would run `scl enable gcc-toolset-X` to open another Bash
 # shell with the GCC toolset enabled. To avoid having to do so, we delete the
 # default GCC packages first, and then reference the GCC toolset binaries
-# directly.
+# directly. Note: we only do so for RHEL 9, as no toolsets are available for
+# RHEL 10 at the moment, and the default GCC 14 is sufficient.
 RUN <<EOF
-dnf remove -y gcc gcc-c++
-dnf install -y --setopt=tsflags=nodocs gcc-toolset-${GCC_VERSION}-gcc gcc-toolset-${GCC_VERSION}-gcc-c++
+if [ "${RHEL_VERSION}" -eq "9" ]; then
+  dnf remove -y gcc gcc-c++
+  dnf install -y --setopt=tsflags=nodocs gcc-toolset-${GCC_VERSION}-gcc gcc-toolset-${GCC_VERSION}-gcc-c++
+  update-alternatives \
+    --install /usr/bin/cc cc /opt/rh/gcc-toolset-${GCC_VERSION}/root/usr/bin/gcc 999
+  update-alternatives \
+    --install /usr/bin/c++ c++ /opt/rh/gcc-toolset-${GCC_VERSION}/root/usr/bin/g++ 999
+  update-alternatives \
+    --install /usr/bin/gcc gcc /opt/rh/gcc-toolset-${GCC_VERSION}/root/usr/bin/gcc 100 \
+    --slave /usr/bin/g++ g++ /opt/rh/gcc-toolset-${GCC_VERSION}/root/usr/bin/g++ \
+    --slave /usr/bin/cpp cpp /opt/rh/gcc-toolset-${GCC_VERSION}/root/usr/bin/cpp \
+    --slave /usr/bin/gcov gcov /opt/rh/gcc-toolset-${GCC_VERSION}/root/usr/bin/gcov \
+    --slave /usr/bin/gcov-dump gcov-dump /opt/rh/gcc-toolset-${GCC_VERSION}/root/usr/bin/gcov-dump-${GCC_VERSION} \
+    --slave /usr/bin/gcov-tool gcov-tool /opt/rh/gcc-toolset-${GCC_VERSION}/root/usr/bin/gcov-tool-${GCC_VERSION}
+  update-alternatives --auto cc
+  update-alternatives --auto c++
+  update-alternatives --auto gcc
+else
+  dnf install -y --setopt=tsflags=nodocs gcc gcc-c++
+fi
 dnf clean -y all
 rm -rf /var/cache/dnf/*
-update-alternatives \
-  --install /usr/bin/cc cc /opt/rh/gcc-toolset-${GCC_VERSION}/root/usr/bin/gcc 999
-update-alternatives \
-  --install /usr/bin/c++ c++ /opt/rh/gcc-toolset-${GCC_VERSION}/root/usr/bin/g++ 999
-update-alternatives \
-  --install /usr/bin/gcc gcc /opt/rh/gcc-toolset-${GCC_VERSION}/root/usr/bin/gcc 100 \
-  --slave /usr/bin/g++ g++ /opt/rh/gcc-toolset-${GCC_VERSION}/root/usr/bin/g++ \
-  --slave /usr/bin/cpp cpp /opt/rh/gcc-toolset-${GCC_VERSION}/root/usr/bin/cpp \
-  --slave /usr/bin/gcov gcov /opt/rh/gcc-toolset-${GCC_VERSION}/root/usr/bin/gcov \
-  --slave /usr/bin/gcov-dump gcov-dump /opt/rh/gcc-toolset-${GCC_VERSION}/root/usr/bin/gcov-dump-${GCC_VERSION} \
-  --slave /usr/bin/gcov-tool gcov-tool /opt/rh/gcc-toolset-${GCC_VERSION}/root/usr/bin/gcov-tool-${GCC_VERSION}
-update-alternatives --auto cc
-update-alternatives --auto c++
-update-alternatives --auto gcc
 EOF
 # Set the compiler environment variables to point to the GCC binaries.
 ENV CC=/usr/bin/gcc