From: ytomino <aghia05@gmail.com>
Subject: gcc-7 breaks unsized C array bindings
Date: Fri, 25 Aug 2017 01:03:06 -0700 (PDT)
Date: 2017-08-25T01:03:06-07:00 [thread overview]
Message-ID: <8e16852a-8d56-401f-bebf-916b918fb020@googlegroups.com> (raw)
Hello.
I'm upgrading my code from gcc-6 to 7, and noticed mysterious Storage_Error in some C bindings.
The cause is array (size_t) for importing unsized C arrays, like below.
C header:
extern int unsized_C_array[];
Ada binding:
unsized_C_array : array (Interfaces.C.size_t) of Interfaces.C.int
with Import, Convention => C, External_Name => "unsized_C_array";
gcc-7 treats this common idiom as a runtime error. Moreover, it reports no message on compile-time. This behavior is very malicious mischief.
(I have already reported it as https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81961 )
Therefore; some bindings are broken now. One way is array (0 .. 0) and pragma Suppress (Index_Check), but I feel it's not smart.
What is better replacement how to rewrite them?
next reply other threads:[~2017-08-25 8:03 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-25 8:03 ytomino [this message]
2017-08-27 7:16 ` gcc-7 breaks unsized C array bindings Shark8
2017-08-27 7:57 ` Jeffrey R. Carter
2017-08-30 21:27 ` Simon Wright
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