Hi,
while looking into building GCC with 4 bytes alignment by default on
m68k, I ran into the following definition in gcc/config/m68k/linux.h:
/* For m68k SVR4, structures are returned using the reentrant
technique. */
#undef PCC_STATIC_STRUCT_RETURN
#define DEFAULT_PCC_STRUCT_RETURN 0
For NetBSD (gcc/config/m68k/netbsd-elf.h), we have:
/* 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
Two questions:
Shouldn't the #undef in linux.h undefine DEFAULT_PCC_STRUCT_RETURN and not
PCC_STATIC_STRUCT_RETURN? And, secondly, shouldn't the comment in linux.h
be corrected since apparently linux.h and netbsd-elf.h disagree on what
the SVR4 ABI specifies how structs and unions are returned?
In particular, it seems that DEFAULT_PCC_STRUCT_RETURN is always 0 on Linux
and always 1 on NetBSD according to a brief "git grep
DEFAULT_PCC_STRUCT_RETURN".
Thanks,
Adrian
--
.''`. John Paul Adrian Glaubitz
: :' : Debian Developer
`. `' Physicist
`- GPG: 62FF 8A75 84E0 2956 9546 0006 7426 3B37 F5B5 F913
