[Premerge] Add flang-rt (#128678)

Flang's runtime can now be built using LLVM's LLVM_ENABLE_RUNTIMES
mechanism, with the intent to remove the old mechanism in #124126.
Update the pre-merge builders to use the new mechanism.

In the current form, #124126 actually will add
LLVM_ENABLE_RUNTIMES=flang-rt implicitly, so no change is strictly
needed. I still think it is a good idea to do it explicitly and in
advance.

On Windows, flang-rt also requires compiler-rt, but which is not
building on Windows anyway.

.ci/compute-projects.sh

@@ -18,15 +18,14 @@ function compute-projects-to-test() {
   shift
   projects=${@}
   for project in ${projects}; do
-    echo "${project}"
     case ${project} in
     lld)
-      for p in bolt cross-project-tests; do
+      for p in lld bolt cross-project-tests; do
         echo $p
       done
     ;;
     llvm)
-      for p in bolt clang clang-tools-extra lld lldb mlir polly; do
+      for p in llvm bolt clang clang-tools-extra lld lldb mlir polly; do
         echo $p
       done
       # Flang is not stable in Windows CI at the moment
@@ -36,21 +35,30 @@ function compute-projects-to-test() {
     ;;
     clang)
       # lldb is temporarily removed to alleviate Linux pre-commit CI waiting times
-      for p in clang-tools-extra compiler-rt cross-project-tests; do
+      for p in clang clang-tools-extra compiler-rt cross-project-tests; do
         echo $p
       done
     ;;
     clang-tools-extra)
-      echo libc
+      for p in clang-tools-extra libc; do
+        echo $p
+      done
     ;;
     mlir)
+      echo mlir
+      # Flang is not stable in Windows CI at the moment
+      if [[ $isForWindows == 0 ]]; then
+        echo flang
+      fi
+    ;;
+    flang-rt)
       # Flang is not stable in Windows CI at the moment
       if [[ $isForWindows == 0 ]]; then
         echo flang
       fi
     ;;
     *)
-      # Nothing to do
+      echo "${project}"
     ;;
     esac
   done
@@ -65,6 +73,11 @@ function compute-runtimes-to-test() {
         echo $p
       done
     ;;
+    flang)
+      for p in flang-rt; do
+        echo $p
+      done
+    ;;
     *)
       # Nothing to do
     ;;

.ci/generate-buildkite-pipeline-premerge

@@ -73,7 +73,7 @@ fi
 # needs while letting them run on the infrastructure provided by LLVM.
 
 # Figure out which projects need to be built on each platform
-all_projects="bolt clang clang-tools-extra compiler-rt cross-project-tests flang libc libclc lld lldb llvm mlir openmp polly pstl"
+all_projects="bolt clang clang-tools-extra compiler-rt cross-project-tests flang flang-rt libc libclc lld lldb llvm mlir openmp polly pstl"
 modified_projects="$(keep-modified-projects ${all_projects})"
 
 linux_projects_to_test=$(exclude-linux $(compute-projects-to-test 0 ${modified_projects}))

.ci/monolithic-linux.sh

@@ -65,6 +65,7 @@ cmake -S "${MONOREPO_ROOT}"/llvm -B "${BUILD_DIR}" \
       -D CMAKE_CXX_FLAGS=-gmlt \
       -D LLVM_CCACHE_BUILD=ON \
       -D MLIR_ENABLE_BINDINGS_PYTHON=ON \
+      -D FLANG_ENABLE_FLANG_RT=OFF \
       -D CMAKE_INSTALL_PREFIX="${INSTALL_DIR}"
 
 echo "--- ninja"
@@ -95,6 +96,9 @@ if [[ "${runtimes}" != "" ]]; then
   cmake -S "${MONOREPO_ROOT}/runtimes" -B "${RUNTIMES_BUILD_DIR}" -GNinja \
       -D CMAKE_C_COMPILER="${INSTALL_DIR}/bin/clang" \
       -D CMAKE_CXX_COMPILER="${INSTALL_DIR}/bin/clang++" \
+      -D CMAKE_Fortran_COMPILER="${BUILD_DIR}/bin/flang" \
+      -D CMAKE_Fortran_COMPILER_WORKS=ON \
+      -D LLVM_BINARY_DIR="${BUILD_DIR}" \
       -D LLVM_ENABLE_RUNTIMES="${runtimes}" \
       -D LIBCXX_CXX_ABI=libcxxabi \
       -D CMAKE_BUILD_TYPE=RelWithDebInfo \
@@ -113,6 +117,9 @@ if [[ "${runtimes}" != "" ]]; then
   cmake -S "${MONOREPO_ROOT}/runtimes" -B "${RUNTIMES_BUILD_DIR}" -GNinja \
       -D CMAKE_C_COMPILER="${INSTALL_DIR}/bin/clang" \
       -D CMAKE_CXX_COMPILER="${INSTALL_DIR}/bin/clang++" \
+      -D CMAKE_Fortran_COMPILER="${BUILD_DIR}/bin/flang" \
+      -D CMAKE_Fortran_COMPILER_WORKS=ON \
+      -D LLVM_BINARY_DIR="${BUILD_DIR}" \
       -D LLVM_ENABLE_RUNTIMES="${runtimes}" \
       -D LIBCXX_CXX_ABI=libcxxabi \
       -D CMAKE_BUILD_TYPE=RelWithDebInfo \
@@ -131,6 +138,9 @@ if [[ "${runtimes}" != "" ]]; then
   cmake -S "${MONOREPO_ROOT}/runtimes" -B "${RUNTIMES_BUILD_DIR}" -GNinja \
       -D CMAKE_C_COMPILER="${INSTALL_DIR}/bin/clang" \
       -D CMAKE_CXX_COMPILER="${INSTALL_DIR}/bin/clang++" \
+      -D CMAKE_Fortran_COMPILER="${BUILD_DIR}/bin/flang" \
+      -D CMAKE_Fortran_COMPILER_WORKS=ON \
+      -D LLVM_BINARY_DIR="${BUILD_DIR}" \
       -D LLVM_ENABLE_RUNTIMES="${runtimes}" \
       -D LIBCXX_CXX_ABI=libcxxabi \
       -D CMAKE_BUILD_TYPE=RelWithDebInfo \

flang-rt/README.md

@@ -124,7 +124,7 @@ $ ninja install
 
 ## Configuration Option Reference
 
-Flang-RT has the followign configuration options. This is in
+Flang-RT has the following configuration options. This is in
 addition to the build options the LLVM_ENABLE_RUNTIMES mechanism and
 CMake itself provide.