I'd like to test lto on a project where objects first go through an
archive, and so wanted to follow
http://gcc.gnu.org/wiki/LinkTimeOptimization
using 'gcc -use-linker-plugin'
However, I can't get this to work.
gfortran -use-linker-plugin -flto main.f90 test.f90
/data03/vondele/binutils-2.19.1/build/bin/ld: -plugin: unknown option
/data03/vondele/binutils-2.19.1/build/bin/ld: use the --help option for
usage information
collect2: ld returned 1 exit status
/data03/vondele/binutils-2.19.1/build/bin/ld -v
GNU gold (GNU Binutils 2.19.1) 1.7
I guess this is some configure flag missing, does anybody have a clue?
gcc configured as:
/data03/vondele/gcc_lto/gcc/configure
--prefix=/data03/vondele/gcc_lto/build
--with-libelf=/data03/vondele/libelf-0.8.10/build/ --enable-gold
--enable-languages=c,c++,fortran --disable-multilib -disable-bootstrap
binutils as:
./configure --prefix=/data03/vondele/binutils-2.19.1/build --enable-gold
This is what collect2 sees:
/data03/vondele/gcc_lto/build/libexec/gcc/x86_64-unknown-linux-gnu/4.5.0/collect2
-plugin
/data03/vondele/gcc_lto/build/libexec/gcc/x86_64-unknown-linux-gnu/4.5.0/liblto_plugin.so
-plugin-opt=/data03/vondele/gcc_lto/build/libexec/gcc/x86_64-unknown-linux-gnu/4.5.0/lto-wrapper
-plugin-opt=gfortran -plugin-opt=-flto -flto --eh-frame-hdr -m elf_x86_64
-dynamic-linker /lib64/ld-linux-x86-64.so.2 -use-linker-plugin
/usr/lib/../lib64/crt1.o /usr/lib/../lib64/crti.o
/data03/vondele/gcc_lto/build/lib/gcc/x86_64-unknown-linux-gnu/4.5.0/crtbegin.o
-L/data03/vondele/gcc_lto/build/lib/gcc/x86_64-unknown-linux-gnu/4.5.0
-L/data03/vondele/gcc_lto/build/lib/gcc/x86_64-unknown-linux-gnu/4.5.0/../../../../lib64
-L/lib/../lib64 -L/usr/lib/../lib64
-L/data03/vondele/gcc_lto/build/lib/gcc/x86_64-unknown-linux-gnu/4.5.0/../../..
/tmp/ccUQ7wr3.o /tmp/cczQrSMz.o -lgfortran -lm -lgcc_s -lgcc -lc -lgcc_s
-lgcc
/data03/vondele/gcc_lto/build/lib/gcc/x86_64-unknown-linux-gnu/4.5.0/crtend.o
/usr/lib/../lib64/crtn.o
Thanks,
Joost
