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Add a LLVM_USE_LINKER that defines the linker to use when building LLVM 

Summary:
This string parameter is passed to -fuse-ld when linking. It can be
an absolute path to your custom linker, otherwise clang will look for
`ld.{name}`.

Reviewers: davide, tejohnson, pcc

Subscribers: llvm-commits, mgorny

Differential Revision: https://reviews.llvm.org/D28738

llvm-svn: 292047
This commit is contained in:
Mehdi Amini 2017-01-15 03:21:30 +00:00
parent 1705f99c77
commit 284ac3c932
2 changed files with 25 additions and 3 deletions
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16
llvm/cmake/modules/HandleLLVMOptions.cmake
View File

@ -147,9 +147,19 @@ function(add_flag_or_print_warning flag name)
endif()
endfunction()
if(LLVM_ENABLE_LLD)
check_cxx_compiler_flag("-fuse-ld=lld" CXX_SUPPORTS_LLD)
append_if(CXX_SUPPORTS_LLD "-fuse-ld=lld"
if( LLVM_ENABLE_LLD )
if ( LLVM_USE_LINKER )
message(FATAL_ERROR "LLVM_ENABLE_LLD and LLVM_USE_LINKER can't be set at the same time")
endif()
set(LLVM_USE_LINKER "lld")
endif()
if( LLVM_USE_LINKER )
check_cxx_compiler_flag("-fuse-ld=${LLVM_USE_LINKER}" CXX_SUPPORTS_CUSTOM_LINKER)
if ( NOT CXX_SUPPORTS_CUSTOM_LINKER )
message(FATAL_ERROR "Host compiler does not support '-fuse-ld=${LLVM_USE_LINKER}'")
endif()
append("-fuse-ld=${LLVM_USE_LINKER}"
CMAKE_EXE_LINKER_FLAGS CMAKE_MODULE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS)
endif()

12
llvm/docs/CMake.rst
View File

@ -382,6 +382,18 @@ LLVM-specific variables
lines, enabling link-time optimization. Possible values are ``Off``,
``On``, ``Thin`` and ``Full``. Defaults to OFF.
**LLVM_USE_LINKER**:STRING
Add ``-fuse-ld={name}`` to the link invocation. The possible value depend on
your compiler, for clang the value can be an absolute path to your custom
linker, otherwise clang will prefix the name with ``ld.`` and apply its usual
search. For example to link LLVM with the Gold linker, cmake can be invoked
with ``-DLLVM_USE_LINKER=gold``.
**LLVM_ENABLE_LLD**:BOOL
This option is equivalent to `-DLLVM_USE_LINKER=lld`, except during a 2-stage
build where a dependency is added from the first stage to the second ensuring
that lld is built before stage2 begins.
**LLVM_PARALLEL_COMPILE_JOBS**:STRING
Define the maximum number of concurrent compilation jobs.