@CPP_FOR_BUILD@ problem since binutils-2.38

[Tom Tromey]

>>>>> "Alan" == Alan Modra via Binutils <binutils@sourceware.org> writes:

Alan> To merge with gcc's copy of configure.ac we need to revert changes to
Alan> configure.ac in the following gcc commits:
Alan> dc832fb39fc0 2022-08-25
Alan> fc259b522c0f 2022-06-25
Alan> Then reapply configure.ac changes in binutils from these binutils
Alan> commits:
Alan> 50ad1254d503 2021-01-09
Alan> bb368aad297f 2022-03-11
Alan> e5f2f7d901ee 2022-07-26
Alan> 2cac01e3ffff 2022-09-26
Alan> Plus copy over gcc's config/ax_cxx_compile_stdcxx.m4, then regenerate
Alan> configure.  configure.ac diff from current binutila shown below.

After this commit I get this when running configure:

../binutils-gdb/configure: line 5699: ACX_PROG_GDC: command not found

I didn't look but I suppose some .m4 file has to be copied over from gcc
as well.

Tom