llvm/cmake/modules/FindLibpfm.cmake

   1 # CMake module for finding libpfm4.
   2 #
   3 # If successful, the following variables will be defined:
   4 # HAVE_LIBPFM
   5 #
   6 # Libpfm can be disabled by setting LLVM_ENABLE_LIBPFM to 0.
   7
   8 include(CheckIncludeFile)
   9 include(CheckLibraryExists)
  10 include(CheckCXXSourceCompiles)
  11
  12 if (LLVM_ENABLE_LIBPFM)
  13   check_library_exists(pfm pfm_initialize "" HAVE_LIBPFM_INITIALIZE)
  14   if(HAVE_LIBPFM_INITIALIZE)
  15     check_include_file(perfmon/perf_event.h HAVE_PERFMON_PERF_EVENT_H)
  16     check_include_file(perfmon/pfmlib.h HAVE_PERFMON_PFMLIB_H)
  17     check_include_file(perfmon/pfmlib_perf_event.h HAVE_PERFMON_PFMLIB_PERF_EVENT_H)
  18     if(HAVE_PERFMON_PERF_EVENT_H AND HAVE_PERFMON_PFMLIB_H AND HAVE_PERFMON_PFMLIB_PERF_EVENT_H)
  19       set(HAVE_LIBPFM 1)
  20       # Check to see if perf_branch_entry has the field 'cycles'.
  21       # We couldn't use CheckStructHasMember here because 'cycles' is a bit field which is not
  22       # supported by CheckStructHasMember.
  23       CHECK_CXX_SOURCE_COMPILES("
  24         #include <perfmon/perf_event.h>
  25         int main() {
  26           perf_branch_entry entry;
  27           entry.cycles = 2;
  28           return 0;
  29         }" COMPILE_WITH_CYCLES)
  30       if(COMPILE_WITH_CYCLES)
  31         set(LIBPFM_HAS_FIELD_CYCLES 1)
  32       endif()
  33     endif()
  34   endif()
  35 endif()
  36
  37