I am trying to do LTO with llvm and the gold plugin to test the case in
http://llvm.org/releases/2.6/docs/LinkTimeOptimization.html
Almost everything works, but foo4 from main.o is not removed. It is interesting
that gold claims to have removed it:
$ LD_LIBRARY_PATH=. ld --eh-frame-hdr -m elf_x86_64 --hash-style=both
-dynamic-linker /lib64/ld-linux-x86-64.so.2 -o main
/usr/lib/gcc/x86_64-linux-gnu/4.2.4/../../../../lib/crt1.o
/usr/lib/gcc/x86_64-linux-gnu/4.2.4/../../../../lib/crti.o
/usr/lib/gcc/x86_64-linux-gnu/4.2.4/crtbegin.o
-L/usr/lib/gcc/x86_64-linux-gnu/4.2.4 -L/usr/lib/gcc/x86_64-linux-gnu/4.2.4
-L/usr/lib/gcc/x86_64-linux-gnu/4.2.4/../../../../lib -L/lib/../lib
-L/usr/lib/../lib -L/usr/lib/gcc/x86_64-linux-gnu/4.2.4/../../.. a.o main.o
-lgcc --as-needed -lgcc_s --no-as-needed -lc -lgcc --as-needed -lgcc_s
--no-as-needed /usr/lib/gcc/x86_64-linux-gnu/4.2.4/crtend.o
/usr/lib/gcc/x86_64-linux-gnu/4.2.4/../../../../lib/crtn.o -plugin=LLVMgold.so
--gc-sections --print-gc-sections
....
ld: removing unused section from '.text.foo4' in file 'main.o'
....
but
objdump -d main | grep foo4 -A 6
0000000000400490 <foo4>: 400490: 55 push %rbp
400491: 48 89 e5 mov %rsp,%rbp
400494: bf d0 05 40 00 mov $0x4005d0,%edi
400499: 5d pop %rbp
40049a: e9 61 01 00 00 jmpq 400600 <p...@plt>
--
Summary: gc not as effective when using a plugin
Product: binutils
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: gold
AssignedTo: tmsriram at google dot com
ReportedBy: espindola at google dot com
CC: bug-binutils at gnu dot org
GCC build triplet: x86_64-linux-gnu
GCC host triplet: x86_64-linux-gnu
GCC target triplet: x86_64-linux-gnu
http://sourceware.org/bugzilla/show_bug.cgi?id=11604
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