Related discussion:
http://gcc.gnu.org/ml/gcc/2005-03/msg00181.html
Given the following,
static char const rcsid[] =
"$Id: f.c,v 5.4 1993/11/09 17:40:15 eggert Exp $";
int main() {}
When compiled with GCC 3.4.3, at -O2, the ident string above will _not_
appear in the executable. This is apparently expected behavior.
However,
gcc -fkeep-static-consts -O2 t.c
did not retain the ident string, rcsid, defined above. Shouldn't
-fkepp-static-consts have ensured that this static constant would appear
in the executable?
The logic in wrapup_global_declarations (toplev.c) doesn't look quite right:
else if (TREE_READONLY (decl) && !TREE_PUBLIC (decl)
&& (optimize || !flag_keep_static_consts
|| DECL_ARTIFICIAL (decl)))
needed = 0;
If 'optimize' is asserted above then flag_keep_static_consts will
not be tested. Perhaps it should read as follows?
&& ((optimize && !flag_keep_static_consts)
Alternatively, I wonder if flag_keep_static_consts should be tested earlier at a
higher level, for example:
if (flag_keep_static_consts)
/* needed */;
but I'm not sure about which of the earlier tests which assert needed = 0;
are mandatory and which are optional.
--
Summary: -fkeep-static-consts with -O asserted doesn't keep
consts
Product: gcc
Version: 3.4.3
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: c
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: gary at intrepid dot com
CC: gcc-bugs at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20319
