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From: "euloanty at live dot com" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug build/29373] Canadian Compilation Failed! gdbsupport/packed.h:41:40: error: static assertion failed for x86_64-w64-mingw32 host.
Date: Tue, 19 Jul 2022 04:21:47 +0000 [thread overview]
Message-ID: <bug-29373-4717-Yw8pIn9K2j@http.sourceware.org/bugzilla/> (raw)
In-Reply-To: <bug-29373-4717@http.sourceware.org/bugzilla/>
https://sourceware.org/bugzilla/show_bug.cgi?id=29373
--- Comment #5 from cqwrteur <euloanty at live dot com> ---
(In reply to Pedro Alves from comment #4)
> I can reproduce this here, cross building with mingw on Fedora.
>
> This is indeed an ABI issue -- mingw defaults to "-mms-bitfields", which
> affects how bitfields are laid out. Luckily, there's an attribute to switch
> ABI on a per struct basis. See:
>
> https://gcc.gnu.org/onlinedocs/gcc/x86-Variable-Attributes.html
>
> This fixes the build for me:
>
> diff --git c/gdbsupport/packed.h w/gdbsupport/packed.h
> index 3468cf44207..a3389afdfb7 100644
> --- c/gdbsupport/packed.h
> +++ w/gdbsupport/packed.h
> @@ -20,6 +20,12 @@
>
> #include "traits.h"
>
> +#ifdef __MINGW32__
> +# define ATTRIBUTE_GCC_STRUCT __attribute__((gcc_struct))
> +#else
> +# define ATTRIBUTE_GCC_STRUCT
> +#endif
> +
> /* Each instantiation and full specialization of the packed template
> defines a type that behaves like a given scalar type, but that has
> byte alignment, and, may optionally have a smaller size than the
> @@ -58,7 +64,7 @@ struct packed
>
> private:
> T m_val : (Bytes * HOST_CHAR_BIT) ATTRIBUTE_PACKED;
> -};
> +} ATTRIBUTE_GCC_STRUCT;
>
> /* Add some comparisons between std::atomic<packed<T>> and T. We need
> this because the regular comparisons would require two implicit
Also cygwin and other pe targets.
you probably need
#if __has_cpp_attribute(__gnu__::__gcc_struct__)
#define ATTRIBUTE_GCC_STRUCT [[__gnu__::__gcc_struct__]]
#endif
something like that to detect the feature
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next prev parent reply other threads:[~2022-07-19 4:21 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-16 20:52 [Bug build/29373] New: " euloanty at live dot com
2022-07-16 20:52 ` [Bug build/29373] " euloanty at live dot com
2022-07-16 20:53 ` euloanty at live dot com
2022-07-18 18:31 ` tromey at sourceware dot org
2022-07-18 18:33 ` tromey at sourceware dot org
2022-07-18 21:18 ` vries at gcc dot gnu.org
2022-07-18 23:34 ` pedro at palves dot net
2022-07-19 4:21 ` euloanty at live dot com [this message]
2022-07-19 11:49 ` pedro at palves dot net
2022-07-19 14:48 ` pedro at palves dot net
2022-07-19 14:48 ` pedro at palves dot net
2022-07-21 12:24 ` vries at gcc dot gnu.org
2022-07-21 13:45 ` pedro at palves dot net
2022-07-21 14:34 ` pedro at palves dot net
2022-07-21 14:53 ` vries at gcc dot gnu.org
2022-07-21 15:27 ` pedro at palves dot net
2022-07-25 15:12 ` cvs-commit at gcc dot gnu.org
2022-07-25 15:20 ` pedro at palves dot net
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