[PATCH 0/3] Recover in-tree libiconv build support

["Arsen Arsenović" <arsen@aarsen.me>]

Evening!

This patchset recovers support for building the toolchain tree with
in-tree libiconv being used for host modules and gettext.  As spotted by
Kévin Le Gouguec <legouguec@adacore.com>, I accidentally removed this
functionality earlier.

This patchset includes the patch sent as:

https://inbox.sourceware.gcc-patches/20231221193243.368541-1-arsen@aarsen.me/

... and so, supersedes that patchset.

For the in-tree case, the old patch functionality was restored and
rebased on top of current iconv.m4.  Of course, this does not work for
gettext, an out-of-tree lib depending on the in-tree libiconv, so, for
that case, we needed to provide the right information to configure, and
suppress logic in iconv.m4 using cache vars.

Build-tested on arm64-apple-darwin21.6.0, and I intend to do further
testing tomorrow.

OK for trunk?  It would be good to get these patches into GCC 14.

I apologize for being quite late with delivering these, I have,
unfortunately, been busied by various external factors.  Hopefully, it
is not too late yet.

Thanks in advance, have a lovely night!

Arsen Arsenović (3):
  toplevel: don't override gettext-runtime/configure-discovered build
    args
  gitignore: ignore /libiconv*
  *: support in-tree libiconv again

 .gitignore             |   1 +
 Makefile.def           |   9 +-
 Makefile.in            | 100 ++++++++---------
 Makefile.tpl           |   8 +-
 config/iconv.m4        |  50 +++++++--
 configure              |  25 +++++
 configure.ac           |  21 ++++
 gcc/configure          | 240 +++++++++++++++++++++++++++++++----------
 libcpp/configure       | 206 ++++++++++++++++++++++++++++-------
 libstdc++-v3/configure | 121 ++++++++++++++++-----
 10 files changed, 601 insertions(+), 180 deletions(-)

-- 
2.44.0