cmake, ldc, and cross compiling
kai at redstar.de
Tue Jan 21 09:35:07 PST 2014
On Tuesday, 21 January 2014 at 08:23:45 UTC, Dan Olson wrote:
> When I build ldc as cross compiler to iOS (armv7-apple-darwin),
> I'd like
> - use gcc-4.8 to compile ldc to host
> - use clang llvm to cross compile runtime C code to iOS
> cmake seems to only have room from one C compiler. Is there a
> around this?
You want to use a target compiler and a host compiler. This is
possible with CMake. See here:
The bad news is that the current CMake files do not support this
setup. (This is issue #490,
> I was initially able to get away with using clang for both
> since I built
> it with all targets enabled. Now I switched from clang to gcc
> for ldc
> build since llvm trunk insists on a newer stdc++. Installing
> from macports was my solution.
clang 3.3 should suffice, too. (But I don't know if it is
available in precompiled form.)
> I think supporting different compilers for ldc and
> runtime/phobos should
> be expected when cross compiling though.
Yes, it is common setup. See above.
> Also, I'd like to add something like CACHE to RT_CFLAGS so that
> it can
> be set with cmake. This will let the runtime C compiler be
> invoked with
> cross compile flags like this:
> set(RT_CFLAGS "-target armv7-apple-darwin -isysroot
Also a reasonable wish.
> I have just been editing the CMakeLists.txt for now to set
> these flags.
We currently have no concept how to setup a cross compiler chain.
All your thoughts are reasonable but not yet integrated into our
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