[Bug ada/108909] New: Build process does not honor discovered path to "gnatmake" and "gnatlink"

["emr-gnu at hev dot psu.edu" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108909

            Bug ID: 108909
           Summary: Build process does not honor discovered path to
                    "gnatmake" and "gnatlink"
           Product: gcc
           Version: 12.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: ada
          Assignee: unassigned at gcc dot gnu.org
          Reporter: emr-gnu at hev dot psu.edu
                CC: dkm at gcc dot gnu.org
  Target Milestone: ---

Created attachment 54521
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=54521&action=edit
Patch to resolve gnatmake build issue

When attempting to build GCC 12.2 from released source:

$ GNATBIND=gnatbind-12.1 GNATMAKE=gnatmake-12.1 ../gcc-12.2.0/configure
--enable-languages=c,c++,ada,fortran --program-suffix=-12.2 {...blah blah...}
{...}
checking for x86_64-linux-gnu-gnatbind... gnatbind-12.1
checking for x86_64-linux-gnu-gnatmake... gnatmake-12.1
checking whether compiler driver understands Ada... yes
{...much later...}
mkdir -p ada/gen_il
cd ada/gen_il; gnatmake -q -g -gnata -gnat2012 -gnatw.g -gnatyg -gnatU
-I/build/gcc-12.2.0/gcc/ada gen_il-main
/bin/sh: gnatmake: command not found
make: *** [ada/stamp-gen_il] Error 127

This seems similar to PR 30541, in that if your system-level packages don't
have the GNAT tools installed, but you have specified an alternate compiler
path to Ada tools in the environment, the build scripts ignore the
configure-guessed (or environment-specified) options, and just blindly call
"gnatmake".  Thus, the build fails.

The fix is to change lines 21, 42, and 49 of gcc/ada/Make-generated.in to use
"$(GNATMAKE)" instead of "gnatmake".