Support PPC64 LE Linux

[runlevel5]

This would add a build config for PowerPC 64 Little Endian architecture with gcc

It's part of my effort to get LWJGL working for game development on the OpenPOWER platform.

Many thanks

How to build?

# make sure you build bx/genie binary on your ppc64le first because the bundled genie is for x86_64
./tools/bin/linux/genie  --gcc=linux-ppc64le-gcc gmake

make  -R -C .build/projects/gmake-linux-ppc64le-gcc/ config=debug64

[runlevel5]

@bkaradzic I hope you are well and sound. I would like to ask the PR is rejected please.

[bkaradzic]

You provided no description about it. So I assumed I don't have to provide reason either...

[runlevel5]

@bkaradzic my bad. Thanks for the feedback.

[runlevel5]

@bkaradzic I have just added description for the PR. If possible, would you be able to re-open the PR? Thanks for the consideration

[bkaradzic]

Which OpenPPC you're using for testing?
Do you need big endian?
Is this the only change that's needed for bgfx to work on Linux PPC or there will be more changes?

[runlevel5]

Which OpenPPC you're using for testing?

Mainly LE variant but I do believe some devs might find BE useful.

---

Is this the only change that's needed for bgfx to work on Linux PPC or there will be more changes?

This is the only change.

[bkaradzic]

Mainly LE variant but I do believe some devs might find BE useful.

I do not plan to support BE at all.

This is the only change.

What's the difference if you just compile it with linux-gcc instead?

[runlevel5]

@bkaradzic the linux-gcc profile has build option for SSE which is not available in PowerISA

make  -R -C .build/projects/gmake-linux config=debug64
make: Entering directory '/home/tle/Work/bx/.build/projects/gmake-linux'
==== Building bx (debug64) ====
Creating ../../linux64_gcc/obj/x64/Debug/bx
Creating ../../linux64_gcc/obj/x64/Debug/bx/src
Creating ../../linux64_gcc/bin
allocator.cpp
g++: error: unrecognized command-line option ‘-mfpmath=sse’
g++: error: unrecognized command-line option ‘-msse2’
make[1]: *** [bx.make:441: ../../linux64_gcc/obj/x64/Debug/bx/src/allocator.o] Error 1
make: *** [Makefile:17: bx] Error 2
make: Leaving directory '/home/tle/Work/bx/.build/projects/gmake-linux'

P/S: I compiled the genie locally so I could run on ppc64le linux

[runlevel5]

I do not plan to support BE at all.

👍 I added a new commit to ensure that

Ref: runlevel5@f63daba

[runlevel5]

Is this the only change that's needed for bgfx to work on Linux PPC or there will be more changes?

It should be enough to unblock me with LWJGL Pull Request LWJGL-CI/bgfx#3

[runlevel5]

@bkaradzic great thanks for reviewing this PR.

I would like to ask if you plan to bundle ppc64le version of genie in ./tools/bin/linux/? If the answer is yes, I could make a pull request

Kind regards