GYP should add -fPIC compile flag for clang and gcc for shared_library on x86-64 and ARM

What steps will reproduce the problem?
Build a shared_library target using gcc or clang without cflags on x86-64.

Example gyp file:

  {
    'targets': [
      {
        'target_name': 'libsomething',
        'type': 'shared_library',
        'sources': [
          'src/filename.cc',
          'src/filename.h',
        ],
      },
    ],
  }

Environment:
  CC=clang
  CXX=clang++
  GYP_GENERATORS=ninja

Gyp command:

$ /usr/bin/gyp --depth .

What is the expected output? What do you see instead?
Expected successful linking of the shared library.

Observed:

FAILED: flock linker.lock clang++ -shared  -o lib/libsomething.so 
-Wl,-soname=libsomething.so -Wl,--whole-archive obj/src/libsomething.filename.o 
-Wl,--no-whole-archive 
/usr/bin/ld: obj/src/libsomething.filename.o: relocation R_X86_64_32S against 
`_ZTVN4i18n12yournamespace10YourClassNamerE' can not be used when making a 
shared object; recompile with -fPIC
obj/src/libsomething.filename.o: could not read symbols: Bad value
clang: error: linker command failed with exit code 1 (use -v to see invocation)
ninja: build stopped: subcommand failed.

What version of the product are you using? On what operating system?
GYP version 0.1~svn1395-1 on Ubuntu 12.04.3 LTS.

Please provide any additional information below.
This is on x86-64 arch. The work-around is to add "-fPIC" clang file manually.

Original issue reported on code.google.com by rous...@chromium.org on 16 Oct 2013 at 6:33

yujiahui / gyp

GYP should add -fPIC compile flag for clang and gcc for shared_library on x86-64 and ARM #374