Is there any way to do a stand alone build of
lingnarl and libgnat without building the whole of gcc?
I’ve tried the following,
mkdir build && cd build
../gcc/configure --enable-languages=ada
cd ada
make gnatlib
but it fails with
raised raised ADA.IO_EXCEPTIONS.NAME_ERROR : s-oscons-tmplt.s: No such file or directory
(having previously issued rm -f rts/s-oscons-tmplt.i rts/s-oscons-tmplt.s
(post deleted by author)
That looks like a missing file or directory to me.
Looks like the immediate cause of the first fail, is that the generated Makefile uses a variable,
$GCC_FOR_TARGET which is undefined when used. Hence errors such as;
/bin/bash: line 2: -W: command not found
/bin/bash: line 3: -W: command not found
because the command should have been gcc -W etc, not just -W.
Defining GCC_FOR_TARGET, the build gets a bit farther,
then fails because tconfig.h is missing. I understand that file should be created
by configure, but is not.
adaint.c:129:10: fatal error: tconfig.h: No such file or directory
run gnatls -v
under “source path” is where your systems rts is. For me it’s /usr/lib/gcc/x86_64-pc-linux-gnu/15/adainclude. If you don’t have gnat but gcc with Ada support you can also run gcc -print-file-name=adainclude to get the path.
You can now build it yourself using by compiling it using -gnatg but I’m not sure if that will work on your system.
If you have the gcc source code you can just use libada.gpr. I haven’t tried that tho. See:
https://gcc.gnu.org/git/?p=gcc.git;a=blob;f=gcc/ada/libgnat/libada.gpr;h=2848c566ee10cdf5844786fd433d75175510726d;hb=refs/heads/master
Success, Thanks!! 
I’m building using gcc source. After the configure step I described above,
this is what I did.
cd ada/rts
mkdir rts-debug
cp rts-debug
cp -a gprls -v | grep adainclude .
cp -a -v ../../*.c .
cp -a -v ../../*.h .
(Copied in unwind-pe.h from libgcc)
gprbuild -p -Plibada -j0 -XCFLAGS="-O2 -g" -XADAFLAGS="-gnatn"
I think the key bit I was missing, was all the gprbuild switches.