build: Separate git operations from build operations.

* gitsub.sh: New file, from gnulib.
* .gitmodules: New file.
* autogen.sh: Remove all git operations. Look at GNULIB_SRCDIR
environment variable. Ignore the GNULIB_TOOL environment variable.
* HACKING: Explain when to use gitsub.sh.

1 files changed, 16 insertions, 1 deletions

diff --git a/HACKING b/HACKING
index 0139dae..1db20b6 100644
--- a/HACKING
+++ b/HACKING
@@ -48,7 +48,22 @@ You will need reasonably recent versions of the build tools:
 
 And, of course, the packages listed in the DEPENDENCIES file.
 
-Then you can run the 'autogen.sh' script 
+
+Building off the Git repository
+===============================
+
+Access to the Git repository is described at
+https://savannah.gnu.org/git/?group=libunistring .
+
+After fetching the sources from the Git repository, peek at the comments in
+autogen.sh, then run
+  ./gitsub.sh pull
+  ./autogen.sh
+Then you can proceed with "./configure" as usual.
+
+Each time you want to update the source, do not only "git pull".  Instead do
+  git pull && ./gitsub.sh pull
+  ./autogen.sh
 
 
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