When configuring gcc on centos 7 with --enable-languages=all, eventually it tries to find if building Ada files is supported: checking whether compiler driver understands Ada... no checking how to compare bootstrapped objects... cmp --ignore-initial=16 $$f1 $$f2 checking for objdir... .libs configure: WARNING: using in-tree isl, disabling version check configure: WARNING: GNAT is required to build ada configure: WARNING: --enable-host-shared required to build jit That error message implies that it can't find gnat. However, gnat is installed: $ gnat GNAT 4.8.5 20150623 (Red Hat 4.8.5-44) Copyright 1996-2013, Free Software Foundation, Inc. ...etc. What the configure test is actually doing is not running "gnat compile conftest.adb". It's running "gcc -c conftest.adb". Doing that manually fails: $ echo "procedure conftest is begin null; end conftest;" > conftest.adb $ gnat compile conftest.adb gcc -c conftest.adb $ gcc -c conftest.adb gcc: error: conftest.adb: Ada compiler not installed on this system Presumably, this is something that configure could handle better, I would think. I would also think that Redhat should package it better. Until then, however, how do I get the system installed gcc to know that gnat is available?
