when building with cwd = source root, use relative pathsconfigure

The pull request that introduced building from a directory other
than the source dir, https://github.com/ninja-build/ninja/pull/979,
made it so all source paths are effectively absolute paths.  This
change restores the old behavior in the case when you are building
in the source.  See the comments there.

1 files changed, 6 insertions, 1 deletions

diff --git a/configure.py b/configure.py
index 845b046..d60cbac 100755
--- a/configure.py
+++ b/configure.py
@@ -281,7 +281,12 @@ def binary(name):
         return exe
     return name
 
-n.variable('root', sourcedir)
+root = sourcedir
+if root == os.getcwd():
+    # In the common case where we're building directly in the source
+    # tree, simplify all the paths to just be cwd-relative.
+    root = '.'
+n.variable('root', root)
 n.variable('builddir', 'build')
 n.variable('cxx', CXX)
 if platform.is_msvc():