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| author | Amy Kwan <amy.kwan1@ibm.com> | 2019-11-21 23:06:33 -0600 |
|---|---|---|
| committer | Amy Kwan <amy.kwan1@ibm.com> | 2019-11-21 23:18:11 -0600 |
| commit | c84c62c50aa8524dbf96217c337f3b5ee4139000 (patch) | |
| tree | 5b432f43c2e51e669a6c9b8f23f92e61ddf05ebe /llvm/cmake | |
| parent | 29f6f9b2b2bfecccf903738e2f5a0cd0a70fce31 (diff) | |
| download | bcm5719-llvm-c84c62c50aa8524dbf96217c337f3b5ee4139000.tar.gz bcm5719-llvm-c84c62c50aa8524dbf96217c337f3b5ee4139000.zip | |
[CMake] Fix LLVM build non-determinism on RHEL
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
Diffstat (limited to 'llvm/cmake')
| -rw-r--r-- | llvm/cmake/modules/HandleLLVMOptions.cmake | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/llvm/cmake/modules/HandleLLVMOptions.cmake b/llvm/cmake/modules/HandleLLVMOptions.cmake index b1174f94ea4..9408eb94af2 100644 --- a/llvm/cmake/modules/HandleLLVMOptions.cmake +++ b/llvm/cmake/modules/HandleLLVMOptions.cmake @@ -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") |
