alexshap created this revision.
Herald added a subscriber: mgorny.
At the moment if LLVM_BUILD_INSTRUMENTED is set to True
one has to set LLVM_PROFTDATA even if it's not necessary (because of
message(FATAL_ERROR ...)).
Building instrumented Clang is useful even if one doesn't plan to use the
target generate-profdata
(currently that target would use only
llvm/tools/clang/utils/perf-training/cxx/hello_world.cpp as a source).
For example, one can run the instrumented version of Clang via a separate build
system against a different codebase,
collect the profiles and merge them by lllvm-profdata later.
Repository:
rL LLVM
https://reviews.llvm.org/D38859
Files:
utils/perf-training/CMakeLists.txt
Index: utils/perf-training/CMakeLists.txt
===================================================================
--- utils/perf-training/CMakeLists.txt
+++ utils/perf-training/CMakeLists.txt
@@ -30,13 +30,18 @@
endif()
if(NOT LLVM_PROFDATA)
- message(FATAL_ERROR "Must set LLVM_PROFDATA to point to llvm-profdata to
use for merging PGO data")
+ set(LLVM_PROFDATA ${LLVM_RUNTIME_OUTPUT_INTDIR}/llvm-profdata)
+ message(STATUS "LLVM_PROFDATA is set to point to llvm-profdata built from
the sources")
+ set(GENERATE_PROFDATA_DEPENDS_ON_LLVM_PROFTDATA TRUE)
endif()
-
+
add_custom_target(generate-profdata
COMMAND ${PYTHON_EXECUTABLE} ${CMAKE_CURRENT_SOURCE_DIR}/perf-helper.py
merge ${LLVM_PROFDATA} ${CMAKE_CURRENT_BINARY_DIR}/clang.profdata
${CMAKE_CURRENT_BINARY_DIR}
COMMENT "Merging profdata"
DEPENDS generate-profraw)
+ if (GENERATE_PROFDATA_DEPENDS_ON_LLVM_PROFTDATA)
+ add_dependencies(generate-profdata llvm-profdata)
+ endif()
endif()
find_program(DTRACE dtrace)
Index: utils/perf-training/CMakeLists.txt
===================================================================
--- utils/perf-training/CMakeLists.txt
+++ utils/perf-training/CMakeLists.txt
@@ -30,13 +30,18 @@
endif()
if(NOT LLVM_PROFDATA)
- message(FATAL_ERROR "Must set LLVM_PROFDATA to point to llvm-profdata to use for merging PGO data")
+ set(LLVM_PROFDATA ${LLVM_RUNTIME_OUTPUT_INTDIR}/llvm-profdata)
+ message(STATUS "LLVM_PROFDATA is set to point to llvm-profdata built from the sources")
+ set(GENERATE_PROFDATA_DEPENDS_ON_LLVM_PROFTDATA TRUE)
endif()
-
+
add_custom_target(generate-profdata
COMMAND ${PYTHON_EXECUTABLE} ${CMAKE_CURRENT_SOURCE_DIR}/perf-helper.py merge ${LLVM_PROFDATA} ${CMAKE_CURRENT_BINARY_DIR}/clang.profdata ${CMAKE_CURRENT_BINARY_DIR}
COMMENT "Merging profdata"
DEPENDS generate-profraw)
+ if (GENERATE_PROFDATA_DEPENDS_ON_LLVM_PROFTDATA)
+ add_dependencies(generate-profdata llvm-profdata)
+ endif()
endif()
find_program(DTRACE dtrace)
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