update git version while bootstrap if git is available

GNUmakefile

@@ -32,14 +32,20 @@ ninja.bootstrap: bootstrap.py
 	  fi; \
 	  unzip -o $(gtestarchive); \
 	fi
+	if [ -d .git ]; then \
+	  branch=`git status -bsu no`; \
+	  revisioncount=`git log --oneline | wc -l`; \
+	  projectversion=`git describe --tags --long --always`; \
+	  echo "const char* kVersion = \"$${branch}-$${projectversion%%-*}\";" > src/version.h; \
+	fi
 	$(RM) build.ninja
 	./$<
 	cp -p -b ninja $@
 	-$(RM) build.ninja
 
 # bootstrap with install ninja!
 ninja: ninja.bootstrap build.ninja
-	./$< -v
+	./$<
 
 manual:: README.html
 README.html: README HACKING GNUmakefile $(bindir)/rst2html-2.7.py

src/ninja.cc

@@ -49,9 +49,8 @@
 
 namespace {
 
-/// The version number of the current Ninja release.  This will always
-/// be "git" on trunk.
-const char* kVersion = "git";
+/// The version number of the current Ninja release.
+#include "version.h"
 
 /// Global information passed into subtools.
 struct Globals {

src/version.h

@@ -0,0 +1 @@
+const char* kVersion = "## develop-b33ff36";