[extend PGO to C++ parts]

Author: kinke

.github/actions/2a-build-pgo/action.yml

@@ -18,7 +18,9 @@ runs:
         cmake_flags: >-
           -DBUILD_SHARED_LIBS=OFF
           "-DDFLAGS_LDC=-fprofile-generate${{ runner.os == 'Windows' && ' -vp-counters-per-site=1.5' || '' }}"
-        #  -DEXTRA_CXXFLAGS=-fprofile-generate
+          -DEXTRA_CXXFLAGS=-fprofile-instr-generate
+          ${{ runner.os == 'Linux' && '-DCMAKE_C_COMPILER="$PWD/../clang/bin/clang"' || '' }}
+          ${{ runner.os == 'Linux' && '-DCMAKE_CXX_COMPILER="$PWD/../clang/bin/clang++"' || '' }}
         extra_d_flags: ${{ inputs.extra_d_flags }}
         arch: ${{ inputs.arch }}
       env:

.github/actions/helper-build-ldc/action.yml

@@ -55,7 +55,7 @@ runs:
         fi
         if [[ "$with_pgo" == true ]]; then
           flags+="-DDFLAGS_LDC=-fprofile-use=../pgo-ldc/merged.profdata "
-          #cxx_flags+=(-fprofile-use=../pgo-ldc/merged.profdata)
+          cxx_flags+=(-fprofile-instr-use=../pgo-ldc/merged.profdata)
         fi
 
         if [[ "${#d_flags[@]}" -gt 0 ]]; then