Hi all,
I am trying to cross-compile a “straight” Darwin toolchain, completely separate
from the toolchain that ships with Xcode on OS X (working with OS X 10.9).
I want to remove all OS X-level dependencies and work purely with the Darwin
layer. In order to do this, it seemed appropriate to follow the
cross-compilation instructions at:
http://llvm.org/docs/HowToCrossCompileLLVM.html
And I ended up with the following build commands:
mkdir build
cd build
CC='clang' CXX='clang++' cmake -G "Unix Makefiles" ../llvm/
-DCMAKE_CROSSCOMPILING=True \
-DCMAKE_INSTALL_PREFIX=/vanillaTools/tools
-DLLVM_DEFAULT_TARGET_TRIPLE=x86_64-novendor-darwin13.1.0 \
-DLLVM_TARGETS_TO_BUILD=X86 -DLLVM_TARGET_ARCH=x86_64 \
-DCMAKE_CXX_FLAGS="-target x86_64-novendor-darwin13.1.0"
make
make install
I noticed the following output in the CMake script:
...
-- Performing Test SUPPORTS_NO_VARIADIC_MACROS_FLAG - Success
-- Target triple: x86_64-apple-darwin13.1.0 # Should the vendor still be
-apple- ?
-- Native target architecture is X86
…
Once installed, I ran the “which clang” command, with the (expected) output:
/vanillaTools/tools/bin/clang
But then I ran:
echo "int main() { return 0; }" | clang -v -x c -
Which resulted in the following output:
clang version 3.5.0 (208516)
Target: x86_64-novendor-darwin13.1.0
Thread model: posix
"/Volumes/DarwinHD/tools/bin/clang-3.5" -cc1 -triple
x86_64-novendor-macosx10.9.0 -emit-obj -mrelax-all -disable-free
-disable-llvm-verifier -main-file-name - -mrelocation-model pic -pic-level 2
-mdisable-fp-elim -masm-verbose -munwind-tables -target-cpu core2 -v
-resource-dir /Volumes/DarwinHD/tools/bin/../lib/clang/3.5.0
-fdebug-compilation-dir /Volumes/DarwinHD/sources/build -ferror-limit 19
-fmessage-length 130 -stack-protector 1 -mstackrealign -fblocks
-fobjc-runtime=macosx-10.9.0 -fencode-extended-block-signature
-fdiagnostics-show-option -fcolor-diagnostics -o /var/tmp/--2f1bef.o -x c -
clang -cc1 version 3.5.0 based upon LLVM 3.5.0svn default target
x86_64-novendor-darwin13.1.0
ignoring nonexistent directory "/usr/include"
#include "..." search starts here:
#include <...> search starts here:
/usr/local/include
/Volumes/DarwinHD/tools/bin/../lib/clang/3.5.0/include
/System/Library/Frameworks (framework directory)
/Library/Frameworks (framework directory)
End of search list.
"/usr/bin/ld" -dynamic -arch x86_64 -macosx_version_min 10.9.0 -o a.out
/var/tmp/--2f1bef.o -lSystem # This is a separate issue - still using the
default linker.
Although the target always says “…darwin13.1.0” the "-triple
x86_64-novendor-macosx10.9.0” and "-fobjc-runtime=macosx-10.9.0” arguments are
inserted by default, even though I have cross compiled the suite for Darwin,
not OS X.
Is this expected behaviour, or have I missed something in the cross-compilation?
I understand that the Obj-C runtime would default to the OS X brand (rather
than the GNU one) - though the fact that it identifies the 10.9.0 version is
concerning - and I would have expected the -triple option to read
x86_64-novendor-darwin13.1.0. Any insight would be much appreciated!
Many thanks in advance,
David Piper
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