[PATCH] D45436: [llvm-exegesis] Add a flag to disable libpfm even if present.

[Clement Courbet via Phabricator via llvm-commits]

courbet updated this revision to Diff 141620.
courbet added a comment.

document LLVM_ENABLE_LIBPFM in docs/CMake.rst


Repository:
  rL LLVM

https://reviews.llvm.org/D45436

Files:
  CMakeLists.txt
  cmake/config-ix.cmake
  docs/CMake.rst


Index: docs/CMake.rst
===================================================================
--- docs/CMake.rst
+++ docs/CMake.rst
@@ -374,6 +374,11 @@
 **LLVM_USE_INTEL_JITEVENTS**:BOOL
   Enable building support for Intel JIT Events API. Defaults to OFF.
 
+**LLVM_ENABLE_LIBPFM**:BOOL
+  Enable building with libpfm to support hardware counter measurements in LLVM
+  tools.
+  Defaults to ON.
+
 **LLVM_ENABLE_ZLIB**:BOOL
   Enable building with zlib to support compression/uncompression in LLVM tools.
   Defaults to ON.
Index: cmake/config-ix.cmake
===================================================================
--- cmake/config-ix.cmake
+++ cmake/config-ix.cmake
@@ -90,13 +90,15 @@
 endif()
 
 # Check for 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)
+if (LLVM_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)
+    endif()
   endif()
 endif()
 
Index: CMakeLists.txt
===================================================================
--- CMakeLists.txt
+++ CMakeLists.txt
@@ -366,6 +366,8 @@
 
 option(LLVM_ENABLE_LIBEDIT "Use libedit if available." ON)
 
+option(LLVM_ENABLE_LIBPFM "Use libpfm for performance counters if available." ON)
+
 option(LLVM_ENABLE_THREADS "Use threads if available." ON)
 
 option(LLVM_ENABLE_ZLIB "Use zlib for compression/decompression if available." ON)


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