[llvm-commits] [llvm] r162219 - in /llvm/trunk: CMakeLists.txt cmake/config-ix.cmake

[Sebastian Pop]

Author: spop
Date: Mon Aug 20 14:56:52 2012
New Revision: 162219

URL: http://llvm.org/viewvc/llvm-project?rev=162219&view=rev
Log:
enable cross compilation with cmake

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

Modified:
    llvm/trunk/CMakeLists.txt
    llvm/trunk/cmake/config-ix.cmake

Modified: llvm/trunk/CMakeLists.txt
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/CMakeLists.txt?rev=162219&r1=162218&r2=162219&view=diff
==============================================================================
--- llvm/trunk/CMakeLists.txt (original)
+++ llvm/trunk/CMakeLists.txt Mon Aug 20 14:56:52 2012
@@ -249,6 +249,14 @@
 # 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,

Modified: llvm/trunk/cmake/config-ix.cmake
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/cmake/config-ix.cmake?rev=162219&r1=162218&r2=162219&view=diff
==============================================================================
--- llvm/trunk/cmake/config-ix.cmake (original)
+++ llvm/trunk/cmake/config-ix.cmake Mon Aug 20 14:56:52 2012
@@ -294,9 +294,7 @@
 
 # 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)