Aha! Exactly the bits of information I need. :)
I'll give it a go shortly. If it doesn't go smoothly, I'll switch to docker
and try the same for cross compiling on Linux.
Does use_sysroot=false mean it's explicitly looking for CC/CXX instead of
whatever is on the PATH, or is it for something different?
I assumed the thing about gclient, but just wanted to be sure, given docs
are explicit about "don't just clone" :)
On Wed, 19 Sep 2018 at 5:19 pm, Jakob Kummerow <jkumme...@chromium.org>
wrote:
> 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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