setup: use relative paths for distutils (#51)

I hope this fixes things...
indygreg · Oct 6, 2018 · 194e5a2 · 194e5a2
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diff --git a/NEWS.rst b/NEWS.rst
@@ -41,6 +41,7 @@ Other Actions Not Blocking Release
 0.10.0 (not yet released)
 =========================
 
+* Use relative paths in setup.py to appease Python 3.7 (#51).
 * Added CI for Python 3.7.
 
 0.9.1 (released 2018-06-04)

diff --git a/setup_zstd.py b/setup_zstd.py
@@ -151,6 +151,11 @@ def get_c_extension(support_legacy=False, system_zstd=False, name='zstd',
 
     libraries = ['zstd'] if system_zstd else []
 
+    # Python 3.7 doesn't like absolute paths. So normalize to relative.
+    sources = [os.path.relpath(p, root) for p in sources]
+    include_dirs = [os.path.relpath(p, root) for p in include_dirs]
+    depends = [os.path.relpath(p, root) for p in depends]
+
     # TODO compile with optimizations.
     return Extension(name, sources,
                      include_dirs=include_dirs,