Use lld linker on travis.

Author: adam-azarchs

.travis.yml

@@ -4,22 +4,18 @@ python:
 - "2.7"
 compiler: clang
 env:
-- CC="clang" CXX="clang++"
+- CC="clang" CXX="clang++" LDFLAGS="-fuse-ld=lld"
 
 dist: xenial
 addons:
   apt:
     packages:
       - build-essential
       - cython
-      - llvm-3.7-dev
       - python-numpy
       - python-pytest
 
 install:
-  - llvm-config --libdir
-  - llvm-config --libdir | xargs sudo mkdir -p
-  - llvm-config --libdir | xargs sudo ln -s /usr/lib/llvm-3.7/lib/LLVMgold.so
   - pip install numpy cython pytest
 script:
   - pwd

setup.py

@@ -7,6 +7,7 @@
 """
 
 import sys
+import os
 import platform
 
 from distutils.core import setup
@@ -47,16 +48,18 @@
 
 else:
     # LINUX
-
+    ldflags = ['-flto', '-ffast-math']
+    if 'LDFLAGS' in os.environ and os.environ['LDFLAGS']:
+        ldflags.extend(os.environ['LDFLAGS'].split(' '))
+    ldflags.extend(['-Wl,-Bdynamic,--as-needed', '-lgcc_s'])
     ext_modules = [Extension(name='bh_sne',
                              sources=['tsne/bh_sne_src/sptree.cpp',
                                       'tsne/bh_sne_src/tsne.cpp', 'tsne/bh_sne.pyx'],
                              include_dirs=[
                                  numpy.get_include(), 'tsne/bh_sne_src/'],
                              extra_compile_args=['-msse3', '-O3', '-Wall', '-flto',
                                                  '-fPIC', '-w', '-std=c++14'],
-                             extra_link_args=['-flto', '-ffast-math',
-                                 '-Wl,-Bdynamic,--as-needed', '-lgcc_s'],
+                             extra_link_args=ldflags,
                              language='c++'),
                    ]