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enable cross compilation with cmake

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This patch allows us to use cmake to specify a cross compiler: target different
than host. In particular, it moves LLVM_DEFAULT_TARGET_TRIPLE and TARGET_TRIPLE
variables from cmake/config-ix.cmake to the toplevel CMakeLists.txt to make them
available at configure time.

Here is the command line that I have used to test my patches to create a Hexagon
cross compiler hosted on x86:

$ cmake -G Ninja -D LLVM_TARGETS_TO_BUILD:STRING=Hexagon -D TARGET_TRIPLE:STRING=hexagon-unknown-linux-gnu -D LLVM_DEFAULT_TARGET_TRIPLE:STRING=hexagon-unknown-linux-gnu -D LLVM_TARGET_ARCH:STRING=hexagon-unknown-linux-gnu ..
$ ninja check

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@162219 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Sebastian Pop 2012-08-20 19:56:52 +00:00
parent 974e12b376
commit df2598871e
2 changed files with 8 additions and 2 deletions
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8
CMakeLists.txt
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@ -249,6 +249,14 @@ option(LLVM_INCLUDE_TESTS "Generate build targets for the LLVM unit tests." ON)
# BEFORE this include, otherwise options will not be correctly set on
# first cmake run
include(config-ix)
# By default, we target the host, but this can be overridden at CMake
# invocation time.
set(LLVM_DEFAULT_TARGET_TRIPLE "${LLVM_HOST_TRIPLE}" CACHE STRING
"Default target for which LLVM will generate code." )
set(TARGET_TRIPLE "${LLVM_DEFAULT_TARGET_TRIPLE}" CACHE STRING
"Default target for which LLVM will generate code." )
include(HandleLLVMOptions)
# Verify that we can find a Python interpreter,

2
cmake/config-ix.cmake
View File

@ -294,9 +294,7 @@ get_host_triple(LLVM_HOST_TRIPLE)
# By default, we target the host, but this can be overridden at CMake
# invocation time.
set(LLVM_DEFAULT_TARGET_TRIPLE "${LLVM_HOST_TRIPLE}")
set(LLVM_HOSTTRIPLE "${LLVM_HOST_TRIPLE}")
set(TARGET_TRIPLE "${LLVM_DEFAULT_TARGET_TRIPLE}")
# Determine the native architecture.
string(TOLOWER "${LLVM_TARGET_ARCH}" LLVM_NATIVE_ARCH)