[PATCH] D84076: [llvm-exegesis] Unset HAVE_LIBPFM if the kernel is too old.

[Vy Nguyen via Phabricator via llvm-commits]

oontvoo updated this revision to Diff 280015.
oontvoo added a comment.

Use Cmake's CheckStructHasMember to check for `cycles` field.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D84076/new/

https://reviews.llvm.org/D84076

Files:
  llvm/cmake/modules/FindLibpfm.cmake


Index: llvm/cmake/modules/FindLibpfm.cmake
===================================================================
--- llvm/cmake/modules/FindLibpfm.cmake
+++ llvm/cmake/modules/FindLibpfm.cmake
@@ -7,6 +7,7 @@
 
 include(CheckIncludeFile)
 include(CheckLibraryExists)
+include(CheckStructHasMember)
 
 if (LLVM_ENABLE_LIBPFM)
   check_library_exists(pfm pfm_initialize "" HAVE_LIBPFM_INITIALIZE)
@@ -16,6 +17,11 @@
     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 this  versions have `cycles` in `struct perf_branch_entry`
+      Check_struct_has_member("struct perf_branch_entry" cycles perfmon/perf_event.h HAS_CYCLES LANGUAGE C)
+      if(HAS_CYCLES)
+        set(LIBPFM_HAS_FIELD_CYCLES 1)
+      endif()
     endif()
   endif()
 endif()


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