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Hi, while bootstrapping gprbuild on arch linux I ran into "can't find a native toolchain for language 'ada'". Others have stumbled upon the same error: https://aur.archlinux.org/packages/xmlada/. The problem seems to be that the gcc version can not be found:

In /usr/share/cprconfig/compilers.xml, gcc -v is called and then grepped with "^gcc \S+ (\S+)".

Output of gcc -v (among other lines): gcc-Version 11.1.0 (GCC)

Output of gcc --version (first line): gcc (GCC) 11.1.0

When replacing gcc -v with gcc --version, the toolchain works just fine. I don't know if this is a problem with recent gcc versions or just arch linux or what the best solution would be without breaking support on other systems.

This issue is a follow-up of the ticket raised here: AdaCore/gprbuild#60

I experience issues with the clang support, which (randomly) replaces gcc if both are installed in /usr/bin.
To reporoduce the problem, I removed gcc and gnatgcc from /usr/bin in order to make sure that clang is triggered.

Create a simple project file:

 $ cat foo.gpr 
 project Foo is
    for Source_Dirs use  (".", "include");
    for Languages use ("C");
    for Main use ("main.c");
  end foo;

Add an include folder and add a dummy "hello.h" file (it can be empty).
Create main.c:

 $ cat main.c
  #include "hello.h"
  int main(void) { }

And run gprbuild to get the error:

$ gprbuild -v -P foo.gpr 
Changing to object directory of "Foo": "/root/tmp/"
/usr/bin/clang -c -x c -specs=/tmp/GNAT-TEMP-000004.TMP /root/tmp/main.c
clang: warning: argument unused during compilation: '-specs=/tmp/GNAT-TEMP-000004.TMP' [-Wunused-command-line-argument]
/root/tmp/main.c:1:10: fatal error: 'hello.h' file not found
#include "hello.h"
         ^~~~~~~~~

If you put gcc or gnatgcc back, the build works.

The problem arises with gprbuild from debian buster:

$ gprbuild --version
GPRBUILD Community 2018 (20180524) (x86_64-pc-linux-gnu)
Copyright (C) 2004-2018, AdaCore
This is free software; see the source for copying conditions.
There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

The compilers.xml file searches in ../lib/ for adalib, however, many distros, on 64bit, it is in ../lib64. I am assuming that there are other options, but can it not search for ../lib* so that they can all be searched for properly.

This comes off the back of gcc-mirror/gcc@9467e73 which fixed a bug where TARGET defined in s-oscons.ads had '-gnu' appended to it compared to 'gcc -dumpmachine '. This caused gprbuild to fail in is search for an Ada runtime.

If the '(.+)?' fix can be made, then we can at last build software on 64bit system without going through hoops.

To reproduce on Ubuntu 20.04:

1. sudo apt-get install gnat-10-i686-linux-gnu gprbuild
2. Run gprconfig
3. Cross-compiler target is not detected despite i686-linux-gnu-gnatls being in my path

I think aarch64-linux-gnu- could be changed to .*-linux-gnu- in compilers.xml and cross.xml to fix most of the issue?