http://sourceware.org/bugzilla/show_bug.cgi?id=12758
Summary: LTO doesn't work with --start-group and archive
Product: binutils
Version: 2.22 (HEAD)
Status: NEW
Severity: normal
Priority: P2
Component: ld
AssignedTo: unassig...@sources.redhat.com
ReportedBy: hjl.to...@gmail.com
CC: amo...@gmail.com
Linux kernel build calls linker with
-plugin /export/build/gnu/gcc-4.6/release/usr/gcc-4.6.1/bin/../libexec/gcc/x86
_64-unknown-linux-gnu/4.6.1/liblto_plugin.so
-plugin-opt=/export/build/gnu/gcc-4
.6/release/usr/gcc-4.6.1/bin/../libexec/gcc/x86_64-unknown-linux-gnu/4.6.1/lto-w
rapper -plugin-opt=-fresolution=/tmp/ccZ8Rces.res -flto=jobserver
--eh-frame-hdr
-m elf_x86_64 -dynamic-linker /lib64/ld-linux-x86-64.so.2 -o vmlinux
-L/export/
build/gnu/gcc-4.6/release/usr/gcc-4.6.1/bin/../lib/gcc/x86_64-unknown-linux-gnu/
4.6.1 -L/export/build/gnu/gcc-4.6/release/usr/gcc-4.6.1/bin/../lib/gcc
-L/export
/build/gnu/gcc-4.6/release/usr/gcc-4.6.1/bin/../lib/gcc/x86_64-unknown-linux-gnu
/4.6.1/../../../../lib64 -L/lib/../lib64 -L/usr/lib/../lib64
-L/export/build/gnu
/gcc-4.6/release/usr/gcc-4.6.1/bin/../lib/gcc/x86_64-unknown-linux-gnu/4.6.1/../
../.. -m elf_x86_64 --build-id -T arch/x86/kernel/vmlinux.lds
arch/x86/kernel/he
ad_64.o arch/x86/kernel/head64.o arch/x86/kernel/head.o
arch/x86/kernel/init_tas
k.o init/built-in.o --start-group usr/built-in.o arch/x86/built-in.o
kernel/buil
t-in.o mm/built-in.o fs/built-in.o ipc/built-in.o security/built-in.o
crypto/bui
lt-in.o block/built-in.o lib/lib.a arch/x86/lib/lib.a lib/built-in.o
arch/x86/li
b/built-in.o drivers/built-in.o sound/built-in.o firmware/built-in.o
arch/x86/pc
i/built-in.o arch/x86/oprofile/built-in.o arch/x86/power/built-in.o
arch/x86/vid
eo/built-in.o net/built-in.o --end-group
But elf_link_add_archive_symbols has
/* Doublecheck that we have not included this object
already--it should be impossible, but there may be
something wrong with the archive. */
if (element->archive_pass != 0)
{
bfd_set_error (bfd_error_bad_value);
goto error_return;
}
which leads to rescan LTO failure on lib/lib.a.
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