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use -O3 with some optimizations disabled on sparc w/ gcc #62

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Feb 22, 2017
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use -O3 with some optimizations disabled on sparc w/ gcc #62

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6 changes: 4 additions & 2 deletions CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -700,8 +700,10 @@ endif()

if( "${CMAKE_CXX_COMPILER_ID}" MATCHES "GNU" AND "${LLVM_NATIVE_ARCH}" MATCHES "Sparc" )
# gcc 4.x, 5.x (at least) generate bad code on sparc above -O0 when compiling
# llvm; notably llvm-tblgen consistently core dumps.
llvm_replace_compiler_option(CMAKE_CXX_FLAGS_RELEASE "-O3" "-O0")
# llvm. Notably llvm-tblgen consistently core dumps, *unless*
# -fno-delayed-branch is specified. Finally, -fno-omit-frame-pointer is
# included to avoid additional code generation and debugging issues.
llvm_replace_compiler_option(CMAKE_CXX_FLAGS_RELEASE "-O3" "-O3 -fno-delayed-branch -fno-omit-frame-pointer")
endif()

# Put this before tblgen. Else we have a circular dependence.
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