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From: milouz <a.michelizza@gmail.com>
Newsgroups: comp.lang.ada
Subject: strange behavior while compiling code with asm()
Date: Thu, 26 May 2011 08:10:11 -0700 (PDT)
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Date: 2011-05-26T08:10:11-07:00
List-Id: <comp.lang.ada>

Hi all,

There's an unexpected behavior I can't understand when I compile some
Ada code with Asm() directive. In the following example, code compile
with no problem :

  ...
  procedure Main is
      Foo : Integer;
  begin
      Foo := 1;       -- Foo is initialized here !
      System.Machine_Code.Asm(
          "movl %0, %%eax",
          Inputs => Integer'Asm_Input("m", Foo),
          Volatile => True
     );
  ...

Why no trying to initialize `Foo' variale during its declaration ? The
code is exactly the same except for `Foo' :

  procedure Main is
      Foo : Integer := 1;     -- Foo is initialized here !
  begin


But then, compilation fails with that message : "error: memory input 0
is not directly addressable"

Someone have an explanation ?