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[CMake] Fix LLVM build non-determinism on RHEL

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On RHEL, the OS tooling (ar, ranlib) is not deterministic by default.
Therefore, we cannot get bit-for-bit identical builds.

The goal of this patch is that it adds the flags required to force determinism.

Differential Revision: https://reviews.llvm.org/D64817
This commit is contained in:
Amy Kwan 2019-11-21 23:06:33 -06:00
parent 0ce2ab6b1d
commit 64269c1442
1 changed files with 22 additions and 0 deletions
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22
cmake/modules/HandleLLVMOptions.cmake
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@ -135,6 +135,28 @@ if(APPLE)
set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} -Wl,-flat_namespace -Wl,-undefined -Wl,suppress")
endif()
if(${CMAKE_SYSTEM_NAME} MATCHES "Linux")
# RHEL7 has ar and ranlib being non-deterministic by default. The D flag forces determinism,
# however only GNU version of ar and ranlib (2.27) have this option.
# RHEL DTS7 is also affected by this, which uses GNU binutils 2.28
execute_process(COMMAND ${CMAKE_AR} rD t.a
WORKING_DIRECTORY ${CMAKE_BINARY_DIR} RESULT_VARIABLE AR_RESULT OUTPUT_VARIABLE RANLIB_OUTPUT)
if(${AR_RESULT} EQUAL 0)
execute_process(COMMAND ${CMAKE_RANLIB} -D t.a
WORKING_DIRECTORY ${CMAKE_BINARY_DIR} RESULT_VARIABLE RANLIB_RESULT OUTPUT_VARIABLE RANLIB_OUTPUT)
if(${RANLIB_RESULT} EQUAL 0)
set(CMAKE_C_ARCHIVE_CREATE "<CMAKE_AR> Dqc <TARGET> <LINK_FLAGS> <OBJECTS>")
set(CMAKE_C_ARCHIVE_APPEND "<CMAKE_AR> Dq <TARGET> <LINK_FLAGS> <OBJECTS>")
set(CMAKE_C_ARCHIVE_FINISH "<CMAKE_RANLIB> -D <TARGET>")
set(CMAKE_CXX_ARCHIVE_CREATE "<CMAKE_AR> Dqc <TARGET> <LINK_FLAGS> <OBJECTS>")
set(CMAKE_CXX_ARCHIVE_APPEND "<CMAKE_AR> Dq <TARGET> <LINK_FLAGS> <OBJECTS>")
set(CMAKE_CXX_ARCHIVE_FINISH "<CMAKE_RANLIB> -D <TARGET>")
endif()
file(REMOVE ${CMAKE_BINARY_DIR}/t.a)
endif()
endif()
if(${CMAKE_SYSTEM_NAME} MATCHES "AIX")
if(NOT LLVM_BUILD_32_BITS)
if (CMAKE_CXX_COMPILER_ID MATCHES "XL")