Exporting libc patches

[Ludovic Courtès]

Hello!

I’m looking at how to export patches from the
‘tschwinge/Roger_Whittaker’ branch to continuously test on Hydra whether
they still apply to upstream glibc.

To that end, the idea I had was to do something along these lines:

   git checkout tschwinge/Roger_Whittaker

   tg export --linearize for-upstream-glibc
   git checkout for-upstream-glibc
   git format-patch # (so that the lexicographic order of file names
                    # matches the topological order)

However, export fails:

--8<---------------cut here---------------start------------->8---
$ tg export --linearize for-upstream-glibc
exported commit t/kernel-features.h_includes
exported commit t/libc_once
exported commit t/struct_stat

[...]

skip empty commit t/bits_socket.h
skip empty commit t/fcntl-internal.h
Auto-merging sysdeps/mach/hurd/kernel-features.h
CONFLICT (content): Merge conflict in sysdeps/mach/hurd/kernel-features.h
fix up the merge and update the index.  Don't commit!
sh-4.1$ git diff HEAD
diff --git a/sysdeps/mach/hurd/kernel-features.h 
b/sysdeps/mach/hurd/kernel-features.h
index e43b0f7..3bef920 100644
--- a/sysdeps/mach/hurd/kernel-features.h
+++ b/sysdeps/mach/hurd/kernel-features.h
@@ -33,4 +33,7 @@
 #endif
 
 #define __ASSUME_SOCK_CLOEXEC  1
+<<<<<<< HEAD
 #define __ASSUME_PIPE2         1
+=======
+>>>>>>> 3c430ffa0ee7582f5e146381ebeb105dc2f4ad90
--8<---------------cut here---------------end--------------->8---

And with ‘--quilt’:

--8<---------------cut here---------------start------------->8---
$ tg export --quilt for-upstream-glibc
Exporting t/init-first.c
Exporting t/kernel-features.h_includes
Exporting t/libc_once

[...]

Skip empty patch t/ld.so_auxv
Exporting t/grantpt
Exporting posix/regex_internal.c/MAX_undefined
tg: fatal: cancelling export of t/__i686_defined (-> 
tschwinge/Roger_Whittaker): branch not up-to-date
--8<---------------cut here---------------end--------------->8---

‘tg patch’ doesn’t even produce a patch:

--8<---------------cut here---------------start------------->8---
$ tg patch| cat
From: Thomas Schwinge <thomas@schwinge.name>
Subject: Roger Whittaker

Not for upstream submission.

Currently used by Thomas Schwinge for building cross toolchains / testing /
development.

---
No changes.
-- 
tg: (f09337f..) tschwinge/Roger_Whittaker (depends on: baseline t/init-first.c 
t/kernel-features.h_includes t/libc_once t/struct_stat t/tls t/tls-threadvar 
t/tlsdesc.sym t/bits_atomic.h_multiple_threads t/bits_stdio-lock.h t/ptrmangle 
t/check_native t/_dl_random t/gscope t/strtoul_PLT t/kernel-features.h_includes 
t/socket_flags t/socketpair_flags t/pipe2 t/dup3 t/accept4 t/bits_sched.h 
t/dl-sysdep.c_SHARED t/__rtld_lock_recursive_t t/____longjmp_chk 
t/unwind-resume.c t/extern_inline t/unwind-resume.c t/ld.so_auxv t/grantpt 
posix/regex_internal.c/MAX_undefined t/__i686_defined)
--8<---------------cut here---------------end--------------->8---

A further complication is that ‘tg remote --populate’ did not fetch the
‘baseline’ branch, which is consequently reported as a missing
dependency.  Running ‘git branch --track baseline origin/baseline’
solves the problem, but doesn’t help ‘export’ and ‘patch’.

Any suggestions?

Thanks,
Ludo’.