[Microbench] Sync with google/benchmark to change FindPFM.cmake (#198)

libpfm only contains dynamic library in some of our environments. Since we don't actually static link them, only find dynamic library is enough. This also aligns with LLVM's configuration

https://github.com/llvm/llvm-project/blob/7d5376270ae5807a29597a91d7cf59f967ccf39e/llvm/cmake/modules/FindLibpfm.cmake#L13

Cherry-picked from: google/benchmark@a092f82
Signed-off-by: Peter Rong <[email protected]>

Author: DataCorrupted

MicroBenchmarks/libs/benchmark/cmake/Modules/FindPFM.cmake

@@ -1,26 +1,33 @@
 # If successful, the following variables will be defined:
-# HAVE_LIBPFM.
-# Set BENCHMARK_ENABLE_LIBPFM to 0 to disable, regardless of libpfm presence.
-include(CheckIncludeFile)
-include(CheckLibraryExists)
+# PFM_FOUND.
+# PFM_LIBRARIES
+# PFM_INCLUDE_DIRS
+# the following target will be defined:
+# PFM::libpfm
+
 include(FeatureSummary)
-enable_language(C)
+include(FindPackageHandleStandardArgs)
 
 set_package_properties(PFM PROPERTIES
                        URL http://perfmon2.sourceforge.net/
-                       DESCRIPTION "a helper library to develop monitoring tools"
+                       DESCRIPTION "A helper library to develop monitoring tools"
                        PURPOSE "Used to program specific performance monitoring events")
 
-check_library_exists(libpfm.a 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)
+find_library(PFM_LIBRARY NAMES pfm)
+find_path(PFM_INCLUDE_DIR NAMES perfmon/pfmlib.h)
+
+find_package_handle_standard_args(PFM REQUIRED_VARS PFM_LIBRARY PFM_INCLUDE_DIR)
+
+if (PFM_FOUND AND NOT TARGET PFM::libpfm)
+    add_library(PFM::libpfm UNKNOWN IMPORTED)
+    set_target_properties(PFM::libpfm PROPERTIES
+        IMPORTED_LOCATION "${PFM_LIBRARY}"
+        INTERFACE_INCLUDE_DIRECTORIES "${PFM_INCLUDE_DIR}")
     message("Using Perf Counters.")
     set(HAVE_LIBPFM 1)
     set(PFM_FOUND 1)
-  endif()
 else()
-  message("Perf Counters support requested, but was unable to find libpfm.")
+    message("Perf Counters support requested, but was unable to find libpfm.")
 endif()
+
+mark_as_advanced(PFM_LIBRARY PFM_INCLUDE_DIR)