Re: DEFAULT_PCC_STRUCT_RETURN on NetBSD vs Linux

John Paul Adrian Glaubitz <[email protected]> Mon, 02 Jun 2025 19:56:27 +0200

Newsgroups	gmane.os.netbsd.ports.m68k,gmane.comp.gcc.patches,gmane.linux.debian.ports.68k
Message-ID	<baa7d5fb638f2dd964e11174da261d9a2b793a59.camel@physik.fu-berlin.de>

On Mon, 2025-06-02 at 19:44 +0200, Andreas Schwab wrote:
> On Jun 02 2025, John Paul Adrian Glaubitz wrote:
> 
> > Both NetBSD and Linux return structs differently, yet the comments in the
> > source code claim their way is according to the m68k SVR4 specification.
> 
> Where does it claim that?

linux.h has:

/* For m68k SVR4, structures are returned using the reentrant                                                                                               
   technique.  */
#undef PCC_STATIC_STRUCT_RETURN
#define DEFAULT_PCC_STRUCT_RETURN 0

while netbsd-elf.h has:

/* The svr4 ABI for the m68k says that records and unions are returned                                                                                      
   in memory.  */

#undef DEFAULT_PCC_STRUCT_RETURN
#define DEFAULT_PCC_STRUCT_RETURN 1

To me both statements seem to contradict each other.

Adrian

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