[Bug c++/26195] [4.0/4.1/4.2 regression] pragma interface no longer handles explicit names

["zak at transversal dot com" <gcc-bugzilla@gcc.gnu.org>]

------- Comment #7 from zak at transversal dot com  2006-02-14 12:08 -------
(We are currently using these pragmas extensively to ensure that various
symbols are laid down *only* in low-level libraries, as a partial workaround
for the COMDAT/dlopen issues described in
http://gcc.gnu.org/ml/gcc/2004-10/msg01118.html)


My patch doesn't touch the lbasename call used to create the implicit parameter
to the directives (ie the one stored in ifiles and passed to interface_strcmp)
-- so the path by which the file is included shouldn't affect the matching
between pragmas without explicit parameters.

The change only affects the filename passed to get_fileinfo. If a header is
included in one place as "[path1]/foo.h" and in another as "[path2]/foo.h",
then there will be two c_fileinfo structs, but both will have processed the
pragmas in the same way (and with the same implicit parameter "foo.h"), causing
interface_only and interface_unknown to be identical in the two structs.

Even if it was necessary, retaining the lbasename calls for the implicit case
doesn't seem practical as the calls to get_fileinfo are made precisely to find
out whether these pragmas are in effect (by looking at interface_only and
interface_unknown) -- hence the argument to the call can't easily depend on
those same pragmas.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26195