I followed the instructions on http://gbalats.github.io/2015/12/10/compiling-autotooled-projects-to-LLVM-bitcode.html#compiling-llvm-from-source-with-gold-plugin to try to compile various projects including the coreutils to LLVM IR.
I tried to test my installation on Ubuntu 14.04 with Clang 3.4 and a simple test file with
clang -flto -fuse-ld=gold -Wl,-plugin-opt=also-emit-llvm test.o
as described but it failed with
test.o: file not recognized: File format not recognized
clang: error: linker command failed with exit code 1 (use -v to see invocation)
However, after adding the parameter -B/usr/lib/gold-ld I could compile the test file.
Still, compiling the coreutils fails with the following error:
/usr/lib/gold-ld/ld: error: src/libver.a: no archive symbol table (run ranlib)
/usr/lib/gold-ld/ld: error: lib/libcoreutils.a: no archive symbol table (run ranlib)
/usr/lib/gold-ld/ld: error: lib/libcoreutils.a: no archive symbol table (run ranlib)
/tmp/lto-llvm-dc31af.o:ld-temp.o:function usage: error: undefined reference to 'program_name'
/tmp/lto-llvm-dc31af.o:ld-temp.o:function usage: error: undefined reference to 'quote'
/tmp/lto-llvm-dc31af.o:ld-temp.o:function usage: error: undefined reference to 'program_name'
/tmp/lto-llvm-dc31af.o:ld-temp.o:function main: error: undefined reference to 'set_program_name'
/tmp/lto-llvm-dc31af.o:ld-temp.o:function main: error: undefined reference to 'exit_failure'
/tmp/lto-llvm-dc31af.o:ld-temp.o:function main: error: undefined reference to 'close_stdout'
/tmp/lto-llvm-dc31af.o:ld-temp.o:function main: error: undefined reference to 'parse_user_spec'
/tmp/lto-llvm-dc31af.o:ld-temp.o:function main: error: undefined reference to 'xgetgroups'
/tmp/lto-llvm-dc31af.o:ld-temp.o:function main: error: undefined reference to 'quote'
/tmp/lto-llvm-dc31af.o:ld-temp.o:function main: error: undefined reference to 'parse_user_spec'
/tmp/lto-llvm-dc31af.o:ld-temp.o:function main: error: undefined reference to 'xgetgroups'
/tmp/lto-llvm-dc31af.o:ld-temp.o:function main: error: undefined reference to 'quote'
/tmp/lto-llvm-dc31af.o:ld-temp.o:function main: error: undefined reference to 'Version'
/tmp/lto-llvm-dc31af.o:ld-temp.o:function main: error: undefined reference to 'version_etc'
/tmp/lto-llvm-dc31af.o:ld-temp.o:function main: error: undefined reference to 'quote'
/tmp/lto-llvm-dc31af.o:ld-temp.o:function parse_additional_groups: error: undefined reference to 'xstrdup'
/tmp/lto-llvm-dc31af.o:ld-temp.o:function parse_additional_groups: error: undefined reference to 'xstrtoul'
/tmp/lto-llvm-dc31af.o:ld-temp.o:function parse_additional_groups: error: undefined reference to 'x2nrealloc'
The last command executed is:
clang -flto -B/usr/lib/gold-ld -Wl,--as-needed -flto -B/usr/lib/gold-ld -fuse-ld=gold -Wl,-plugin-opt=also-emit-llvm -o src/chroot src/chroot.o src/libver.a lib/libcoreutils.a lib/libcoreutils.a
Manually executing llvm-ranlib on libver.a and libcoreutils.a does not change the outcome. Executing llvm-nm -s src/libver.a prints the following:
D Version
However, with a normal build the output is the following:
Archive map
Version in version.o
version.o:
00000000 D Version
Is there a problem with llvm-ranlib? Do you have any suggestions on how to fix the linker error?
