I'm afraid we don't officially support cross-compiling on OSX, which means
it might work, but you're on your own. We'd be happy to accept patches or
documentation improvements, with community-maintained status.
That said:
I'd set is_clang=false and use_sysroot=false in args.gn, and set
CC/CXX/LINK via the environment. How far does that get you?
target_os=["android"] in .gclient should not be necessary. I believe that
only controls the downloading of the Android NDK, which you're not
interested in using.
GN ("generate ninja") and Ninja work together to provide Make-like
functionality. Ninja is designed to be simple but fast, GN does all the
evaluation of flags and conditions. By inspecting the generated *.ninja
files, you can check what GN did with the args you provided.
gclient is a dependency management tool (similar to git submodules); it is
not involved in the build process itself.
On Wed, Sep 19, 2018 at 4:00 AM <gra...@grahamreeves.com> wrote:
> I'm trying to build v8 for an arm cpu, and I have gcc/++/etc for that
> architecture built on osx (so I can cross compile), which currently builds
> my executable, all working fine.
>
> Now I'm hoping to build v8. Whatever OS side changes I might need to make,
> (this is not for linux) I can do.
>
> What I haven't managed to do yet, is get v8 compiling.
> Is this possible with depot_tools/ninja ?
>
> I've not been able to find any guides so far that aren't android focussed,
> eg.
>
> https://stackoverflow.com/questions/43490689/cross-compiling-v8-build-for-android-on-mac
> https://github.com/v8/v8/wiki/Cross-compiling-for-ARM
>
> From what I can tell, the gclient setup has some specific setup for when
> the target_os is "android".
> Maybe it's using some explicit NDK based paths to find GCC executables?
> (This is a little hidden)
> I looked at the gn --args all and couldn't really see anything about
> explicitly setting toolchain paths
>
> Is convention to build as if it's android, and maybe swap out all of NDK's
> gcc with my own?
> or set the target_os to unix, and then... where would I put the toolchain?
>
> I've set *is_clang = false*
>
> Unless I'm overthinking it? This is my error when I try to build
> arm.release. I have been assuming there are no rules setup to build .cc
> with a particular gcc executable
>
> ninja: error: '../../src/base/bits.cc', needed by
> 'clang_x86_v8_arm/obj/v8_libbase/bits.o', missing and no known rule to make
> it
>
>
> toolchain.ninja (which I assume is like a makefile, I'm very new to
> ninja/gclient) has entries for cc
>
> rule cc
>
> command = ../../third_party/llvm-build/Release+Asserts/bin/clang -MMD
> -MF ${out}.d ${defines} ${include_dirs} ${cflags} ${cflags_c} -c ${in} -o
> ${out}
>
> description = CC ${out}
>
> depfile = ${out}.d
>
> deps = gcc
> But I guess they're inheritly wrong?
>
> I feel like I've just missed an obvious step with setting up the target,
> but the android setup is obfuscated so I'm blindly hunting around trying to
> see if export CC= is set somewhere :)
>
>
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