This example illustrates using an Emacs Ada mode project file to set a compiler option.
If you have files from Example_1 open in Emacs, you should close them so you don't get confused. Use menu ‘File | Close (current buffer)’.
In directory Example_2, create these files:
with Ada.Text_IO; procedure Hello is begin Put_Line("Hello from hello.adb"); end Hello;
This is the same as hello.adb from Example_1. It has two
errors; missing “use Ada.Text_IO;”, and no space between
Put_Line and its argument list.
This tells the GNAT compiler to check for token spacing; in particular, there must be a space preceding a parenthesis.
In buffer hello.adb, invoke ‘Ada | Project | Load...’, and select Example_2/hello.adp.
Then, again in buffer hello.adb, invoke ‘Ada | Set main and
Build’. You should get a
*compilation* buffer containing
something like (the directory paths will be different):
cd c:/Examples/Example_2/ gnatmake -o hello hello -g -cargs -gnatyt -bargs -largs gcc -c -g -gnatyt hello.adb hello.adb:4:04: "Put_Line" is not visible hello.adb:4:04: non-visible declaration at a-textio.ads:264 hello.adb:4:04: non-visible declaration at a-textio.ads:260 hello.adb:4:12: (style) space required gnatmake: "hello.adb" compilation error
Compare this to the compiler output in No project files; the
-cargs -gnatq -gnatQ has been replaced by
-cargs -gnaty, and an additional error is reported in
hello.adb on line 4. This shows that hello.adp is being
used to set the compiler options.
Fixing the error, linking and running the code proceed as in No project files.