Q: GNAT GPL 2014, configuration pragma, unneeded recompilation

Q: GNAT GPL 2014, configuration pragma, unneeded recompilation

[gautier_niouzes]

Hello,
Since v. GPL 2014, gnatmake/gprbuild (on Windows at least) recompiles every time all units of a project when the build option -gnatec[file_name] is used.
For instance: -gnatecdebug.pra, where the file debug.pra contains: "pragma Initialize_Scalars;".
This happens also when file debug.pra is unchanged between two builds.
The unneeded recompilation is very annoying.
Does someone have a solution (before I send a bug report...) ?
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Gautier's Ada programming
http://gautiersblog.blogspot.com/search/label/Ada
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Re: Q: GNAT GPL 2014, configuration pragma, unneeded recompilation

[gautier_niouzes]

Could make a reproducer:

new file: p.adb: procedure P is begin null; end;
new file: d.pra: pragma Initialize_Scalars;
new directory: ./obj
cd obj
gnatmake -gnatec../d.pra ../p.adb
gnatmake -gnatec../d.pra ../p.adb

Variant with a project file p.gpr:
project P is
   for Main use ("p.adb");
   for Object_Dir use "obj";
   package Compiler is
      for Default_Switches ("ada") use ("-gnatec../d.pra");
   end Compiler;
end P;

gnatmake -P p
gnatmake -P p

From the .ali file it appears that configuration pragma files are now being tracked for changes (a good thing) but obviously not properly...

G.

Re: Q: GNAT GPL 2014, configuration pragma, unneeded recompilation

[gautier_niouzes]

The solution (thanks AdaCore!): use gprbuild instead of gnatmake.
Now, in GPS, on Ada-only projects, the default is gnatmake.
To change that:
  Click on Edit -> Preferences
  In tab General, for Default builder, select gprbuild
Et voilà!...
_________________________ 
Gautier's Ada programming 
http://sf.net/users/gdemont/