[CMake] Add RCC platform configuration checks

1 files changed, 37 insertions, 0 deletions

diff --git a/rcc/cmake/modules/FindLibpfm.cmake b/rcc/cmake/modules/FindLibpfm.cmake
new file mode 100644
index 0000000..9e5900b
--- /dev/null
+++ b/rcc/cmake/modules/FindLibpfm.cmake
@@ -0,0 +1,37 @@
+# CMake module for finding libpfm4.
+#
+# If successful, the following variables will be defined:
+# HAVE_LIBPFM
+#
+# Libpfm can be disabled by setting RCC_ENABLE_LIBPFM to 0.
+
+include(CheckIncludeFile)
+include(CheckLibraryExists)
+include(CheckCXXSourceCompiles)
+
+if (RCC_ENABLE_LIBPFM)
+  check_library_exists(pfm pfm_initialize "" HAVE_LIBPFM_INITIALIZE)
+  if(HAVE_LIBPFM_INITIALIZE)
+    check_include_file(perfmon/perf_event.h HAVE_PERFMON_PERF_EVENT_H)
+    check_include_file(perfmon/pfmlib.h HAVE_PERFMON_PFMLIB_H)
+    check_include_file(perfmon/pfmlib_perf_event.h HAVE_PERFMON_PFMLIB_PERF_EVENT_H)
+    if(HAVE_PERFMON_PERF_EVENT_H AND HAVE_PERFMON_PFMLIB_H AND HAVE_PERFMON_PFMLIB_PERF_EVENT_H)
+      set(HAVE_LIBPFM 1)
+      # Check to see if perf_branch_entry has the field 'cycles'.
+      # We couldn't use CheckStructHasMember here because 'cycles' is a bit field which is not
+      # supported by CheckStructHasMember.
+      CHECK_CXX_SOURCE_COMPILES("
+        #include <perfmon/perf_event.h>
+        int main() {
+          perf_branch_entry entry;
+          entry.cycles = 2;
+          return 0;
+        }" COMPILE_WITH_CYCLES)
+      if(COMPILE_WITH_CYCLES)
+        set(LIBPFM_HAS_FIELD_CYCLES 1)
+      endif()
+    endif()
+  endif()
+endif()
+
+