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ada-mode: Use GNAT project file

 
 6.4 Use GNAT project file
 =========================
 
 In this example, we show how to use a GNAT project file, with no Ada
 mode project file.
 
    Create the directory ‘Example_4’, containing:
 
    ‘hello_pkg.ads’:
 
      package Hello_Pkg is
         procedure Say_Hello;
      end Hello_Pkg;
 
    ‘hello_pkg.adb’:
 
      with Ada.Text_IO;
      package Hello_Pkg is
         procedure Say_Hello
         is begin
            Ada.Text_IO.Put_Line ("Hello from hello_pkg.adb");
         end Say_Hello;
      end Hello_Pkg;
 
    These are the same files from example 1; ‘hello_pkg.adb’ has an error
 on line 2.
 
    In addition, create a directory ‘Example_4/Gnat_Project’, containing
 these files:
 
    ‘Gnat_Project/hello_4.adb’:
 
      with Hello_Pkg;
      with Ada.Text_IO; use Ada.Text_IO;
      procedure Hello_4
      is begin
         Hello_Pkg.Say_Hello;
         Put_Line ("From hello_4");
      end Hello_4;
 
    There are no errors in this file.
 
    ‘Gnat_Project/hello_4.gpr’:
 
      Project Hello_4 is
         for Source_Dirs use (".", "..");
      end Hello_4;
 
    In buffer ‘hello_4.adb’, invoke ‘Ada | Project | Load...’, and select
 ‘Example_4/Gnat_Project/hello_4.gpr’.
 
    Then, again in ‘hello_4.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_4/Gnat_Project/
      gnatmake -o hello_4 hello_4 -Phello_4.gpr -cargs -gnatq -gnatQ -bargs  -largs
      gcc -c -g -gnatyt -gnatq -gnatQ -I- -gnatA c:\Examples\Example_4\Gnat_Project\hello_4.adb
      gcc -c -g -gnatyt -gnatq -gnatQ -I- -gnatA c:\Examples\Example_4\hello_pkg.adb
      hello_pkg.adb:2:08: keyword "body" expected here [see file name]
      gnatmake: "c:\examples\example_4\hello_pkg.adb" compilation error
 
    Compare the ‘gcc’ options to the compiler output in Set
 compiler options; this shows that ‘hello_4.gpr’ is being used to set
 the compiler options.
 
    Fixing the error, linking and running the code proceed as in No
 project files.
 

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