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Rebuilding gcc/gnat after changes

From: Jan Sommer <soja-lists at aries dot uberspace dot de>
To: gcc-help <gcc-help at gcc dot gnu dot org>
Date: Sat, 11 Jul 2015 23:17:26 +0200
Subject: Rebuilding gcc/gnat after changes
Authentication-results: sourceware.org; auth=none

Hi,

I built a cross-compiler with Ada support enabled. Now, if I change a file (e.g. ggc/ada/a-retide.adb) and run "make all" it does not recompile the changed file.
How do I rebuild only the changed files? I don't want to rebuild the whole toolchain everytime I make a change.

Best regards,

   Jan

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