Make it possible to build iojs with ninja

[yury-s]

This change fixes link-time error when building iojs with ninja instead of make. The following commands now work fine:

$ ./tools/gyp_node.gyp -f ninja
$ ninja -C out/Release iojs -j100

The patch is going to be merged into gyp (https://codereview.chromium.org/1209553002/). The more details about why this change is necessary can be found in the mentioned codereview.

[Fishrock123]

It is currently possible to build io.js with ninja (I do it all the time), but make will still do some steps if you run it, which is a little annoying for things like make test.

I have an alias set up to do: ./configure && tools/gyp_node.py -f ninja && ninja -C out/Release && ln -fs out/Release/iojs iojs

@yury-s does this fix that issue where make will still do extra build stuff if you run it, or?

[yury-s]

@Fishrock123 which platform are you on (I suspect it may work on Mac because of different toolset used there, did't have chance to check)?

The command line you specified fails for me on linux. ninja -C out/Release fails with tons of 'multiple symbol definition' errors:
.....
/usr/lib/gcc/x86_64-linux-gnu/4.8/libgcc.a(morestack.o):(.text+0x157): first defined here
/usr/lib/gcc/x86_64-linux-gnu/4.8/libgcc.a(morestack.o): In function __morestack_make_guard': (.text+0x161): multiple definition of__morestack_make_guard'
/usr/lib/gcc/x86_64-linux-gnu/4.8/libgcc.a(morestack.o):(.text+0x161): first defined here
collect2: error: ld returned 1 exit status
ninja: build stopped: subcommand failed.

btw, the gyp patch I mentioned has landed in the gyp repository. I'm not sure how often iojs' copy of gyp is updated though.

[bnoordhuis]

#2074 - it was about time we upgraded again anyway.

[Fishrock123]

@Fishrock123 which platform are you on (I suspect it may work on Mac because of different toolset used there, did't have chance to check)?

Ah, possibly, yes. I use Ninja 1.5.3 on OS X 10.10.3

[bnoordhuis]

Fixed by 99cbbc0.