http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46944
Summary: gcc should accept -fuse-linker-plugin only if linker
handles -plugin
Product: gcc
Version: 4.6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: lto
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: r...@gcc.gnu.org
CC: da...@gcc.gnu.org, ccout...@google.com
Host: *-*-solaris2.*
Target: *-*-solaris2.*
Build: *-*-solaris2.*
While the new gcc.dg/pr43157.c testcase didn't contain
/* { dg-require-linker-plugin "" } */
it failed on Solaris 11/x86 using the Sun linker like this, but only with -m64:
FAIL: gcc.dg/pr43157.c (test for excess errors)
Excess errors:
ld: fatal: file /usr/lib/amd64/crt1.o: wrong ELF class: ELFCLASS64
ld: fatal: file processing errors. No output written to pr43157.exe
The problem is that ld is ultimately invoked as
/usr/ccs/bin/ld -plugin liblto_plugin.so ... -o pr43157.exe
/usr/lib/amd64/crt1.o ...
Since the compiler (and thus liblto_plugin.so) are 32-bit objects, crt1.o and
all
other input objects are 64-bit, yielding the error message above.
While Sun ld doesn't understand -plugin proper, it does accept -p auditlib, as
described in the manpage:
-p auditlib
Identifies an audit library, auditlib. This audit
library is used to audit the object being created at
runtime. A shared object identified as requiring audit-
ing with the -p option, has this requirement inherited
by any object that specifies the shared object as a
dependency. See the -P option. See Runtime Linker Audit-
ing Interface in Linker and Libraries Guide.
So, the invocation above is parsed as -p lugin liblto_plugin.so, i.e. try to
load an auditlib named lugin and pass liblto_plugin.so as regular input file.
I think it's obvious that the gcc configury should verify that the linker used
really understands -plugin and not only happens to have some other option
that something completely different. Only if this has been verified should
-plugin be passed to the linker when -fuse-linker-plugin is given, otherwise
the option should be rejected with a proper error message.
