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From: Ludovic Brenta <ludovic@ludovic-brenta.org>
Newsgroups: comp.lang.ada
Subject: Re: -fdump-ada-spec (was: Newcomers to comp.lang.ada: welcome and how
 did you end up here ?)
Date: Wed, 08 Oct 2014 21:14:34 +0200
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Date: 2014-10-08T21:14:34+02:00
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> Apparently one should use g++ rather than gcc, because it makes a better
> job of it.
>
> GNAT GPL 2014 does translate (some) macros; it doesn't always get it
> right, eg
>
>    #define M_SQRT2     1.41421356237309504880168872420969808   /* sqrt(2)        */
>    #define M_SQRT1_2   0.707106781186547524400844362104849039  /* 1/sqrt(2)      */
>    #define MAXFLOAT    0x1.fffffep+127f
>
>    // have to have _something_ besides the constants or no .ads gets
>    // generated.
>    extern float sinf(float);
>
> turns into
>
>    pragma Ada_2005;
>    pragma Style_Checks (Off);
>
>    with Interfaces.C; use Interfaces.C;
>
>    package math_h is
>
>
>       M_SQRT2 : constant := 1.41421356237309504880168872420969808;  --  ./math.h:1
>       M_SQRT1_2 : constant := 8#.707106781186547524400844362104849039#;  --  ./math.h:2
                                ^^                                     ^

Isn't that a blatant bug?  Either in the Ada or in the C source?

-- 
Ludovic Brenta.