[Clang][CI] Extend clang version output (#20520)

There is a customer request to make `clang++ --version` output more
informative. This patch adds a string like this to the output:
"Intel SYCL compiler X build based on:" - here goes regular clang
output.
Where X is "development" by default.
"Nightly YYYY-MM-DD" for regular nightly builds.
"X.Y.Z Nightly YYYY-MM-DD" for nightly release builds.
"X.Y.Z release" for official releases.
E.g.:
```
Intel SYCL compiler development build based on:
clang version 22.0.0git (https://github.com/intel/llvm.git 479b59d)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /localdisk2/llvm/build/bin
Build config: +assertions
```

Author: KornevNikita

.github/workflows/sycl-linux-build.yml

@@ -209,6 +209,7 @@ jobs:
       id: build
       # Emulate default value for manual dispatch as we've run out of available arguments.
       run: cmake --build $GITHUB_WORKSPACE/build --target ${{ inputs.build_target || 'sycl-toolchain' }}
+    - run: $GITHUB_WORKSPACE/build/bin/clang++ --version
     - name: check-llvm
       if: ${{ !cancelled() && contains(inputs.changes, 'llvm') }}
       env:

.github/workflows/sycl-nightly.yml

@@ -23,13 +23,22 @@ jobs:
         git diff --exit-code -I "^# RUN" origin/sycl-rel-6_3:sycl/test/abi/sycl_symbols_linux.dump sycl/test/abi/sycl_symbols_linux-sycl-rel-6_3.dump
         git diff --exit-code -I "^# RUN" origin/sycl-rel-6_3:sycl/test/abi/sycl_symbols_windows.dump sycl/test/abi/sycl_symbols_windows-sycl-rel-6_3.dump
 
+  get_date:
+    runs-on: ubuntu-latest
+    outputs:
+      date: ${{ steps.get_date.outputs.date }}
+    steps:
+    - id: get_date
+      run: echo "date=$(date +'%Y-%m-%d')" >> $GITHUB_OUTPUT
+
   ubuntu2204_build:
+    needs: get_date
     if: github.repository == 'intel/llvm'
     uses: ./.github/workflows/sycl-linux-build.yml
     secrets: inherit
     with:
       build_cache_root: "/__w/"
-      build_configure_extra_args: '--hip --cuda'
+      build_configure_extra_args: '--hip --cuda -DSYCL_BUILD_INFO="Nightly ${{ needs.get_date.outputs.date }}"'
       build_image: ghcr.io/intel/llvm/ubuntu2204_build:latest
 
       retention-days: 90
@@ -189,6 +198,7 @@ jobs:
       toolchain_decompress_command: ${{ needs.ubuntu2404_oneapi_build.outputs.toolchain_decompress_command }}
 
   build-win:
+    needs: get_date
     uses: ./.github/workflows/sycl-windows-build.yml
     if: github.repository == 'intel/llvm'
     with:
@@ -197,7 +207,7 @@ jobs:
       # functionality, make sure Linux/Windows names follow the same pattern.
       toolchain_artifact_filename: sycl_windows.tar.gz
       # Disable the spirv-dis requirement as to not require SPIR-V Tools.
-      build_configure_extra_args: -DLLVM_SPIRV_ENABLE_LIBSPIRV_DIS=off
+      build_configure_extra_args: -DLLVM_SPIRV_ENABLE_LIBSPIRV_DIS=off -DSYCL_BUILD_INFO="Nightly ${{ needs.get_date.outputs.date }}"
       build_target: all
 
   e2e-win:
@@ -358,7 +368,7 @@ jobs:
   nightly_build_upload:
     name: Nightly Build Upload
     if: ${{ github.ref_name == 'sycl' }}
-    needs: [ubuntu2204_build, build-win]
+    needs: [get_date, ubuntu2204_build, build-win]
     runs-on: ubuntu-latest
     permissions:
       contents: write
@@ -378,10 +388,10 @@ jobs:
       id: tag
       run: |
         if [ "${{ github.event_name == 'schedule' }}" == "true" ]; then
-          echo "TAG=$(date +'%Y-%m-%d')" >> "$GITHUB_OUTPUT"
+          echo "TAG=${{ needs.get_date.outputs.date }}" >> "$GITHUB_OUTPUT"
         else
           # TODO: Use date of the commit?
-          echo "TAG=$(date +'%Y-%m-%d')-${GITHUB_SHA::7}" >> "$GITHUB_OUTPUT"
+          echo "TAG=${{ needs.get_date.outputs.date }}-${GITHUB_SHA::7}" >> "$GITHUB_OUTPUT"
         fi
     - name: Upload binaries
       uses: softprops/action-gh-release@6da8fa9354ddfdc4aeace5fc48d7f679b5214090 # v2.4.1

.github/workflows/sycl-windows-build.yml

@@ -159,6 +159,7 @@ jobs:
       shell: bash
       run: |
         cmake --build build --target ${{ inputs.build_target }}
+    - run: build/bin/clang++ --version
     - name: check-llvm
       if: ${{ !cancelled() && contains(inputs.changes, 'llvm') }}
       shell: bash

clang/include/clang/Basic/Version.h

@@ -66,6 +66,9 @@ namespace clang {
   /// the CL_SYCL_LANGUAGE_VERSION and SYCL_LANGUAGE_VERSION macros.
   llvm::SmallVector<std::pair<llvm::StringRef, llvm::StringRef>, 2>
   getSYCLVersionMacros(const LangOptions &LangOpts);
+
+  /// Retrieves a string representing the Intel SYCL compiler build info.
+  std::string getSYCLBuildInfo();
 }
 
 #endif // LLVM_CLANG_BASIC_VERSION_H

clang/lib/Basic/CMakeLists.txt

@@ -42,6 +42,7 @@ add_custom_command(OUTPUT "${version_inc}"
                            "-DLLVM_VC_REVISION=${llvm_vc_revision}"
                            "-DLLVM_FORCE_VC_REVISION=${LLVM_FORCE_VC_REVISION}"
                            "-DLLVM_FORCE_VC_REPOSITORY=${LLVM_FORCE_VC_REPOSITORY}"
+                           "-DSYCL_BUILD_INFO=${SYCL_BUILD_INFO}"
                            -P "${generate_vcs_version_script}")
 
 # Mark the generated header as being generated.

clang/lib/Basic/Version.cpp

@@ -65,6 +65,14 @@ std::string getClangVendor() {
 #endif
 }
 
+std::string getSYCLBuildInfo() {
+#ifdef SYCL_BUILD_INFO
+  return SYCL_BUILD_INFO;
+#else
+  return "development";
+#endif
+}
+
 std::string getClangFullRepositoryVersion() {
   std::string buf;
   llvm::raw_string_ostream OS(buf);

clang/lib/Driver/Driver.cpp

@@ -2735,6 +2735,7 @@ void Driver::PrintSYCLToolHelp(const Compilation &C) const {
 }
 
 void Driver::PrintVersion(const Compilation &C, raw_ostream &OS) const {
+  OS << "Intel SYCL compiler " << getSYCLBuildInfo() << " build based on:\n";
   if (IsFlangMode()) {
     OS << getClangToolFullVersion("flang") << '\n';
   } else {

clang/test/Driver/sycl-build-info.c

@@ -0,0 +1,3 @@
+// RUN: %clang --version 2>&1 | FileCheck %s
+
+// CHECK: Intel SYCL compiler{{.*}}based on:

llvm/cmake/modules/GenerateVersionFromVCS.cmake

@@ -56,6 +56,11 @@ foreach(name IN LISTS NAMES)
   append_info(${name} "${revision}" "${repository}")
 endforeach()
 
+if(SYCL_BUILD_INFO)
+  file(APPEND "${HEADER_FILE}.tmp"
+      "#define SYCL_BUILD_INFO \"${SYCL_BUILD_INFO}\"\n")
+endif()
+
 # Copy the file only if it has changed.
 execute_process(COMMAND ${CMAKE_COMMAND} -E copy_if_different
   "${HEADER_FILE}.tmp" "${HEADER_FILE}")