Builds ok, but then fails to link sample program #17
Description
We followed the direction at https://cilkplus.github.io/ and everything appeared to work ok. However, when we try and compile and link the example program, fib.c, we get the following:
Clang Front-End version 3.4.1 (tags/RELEASE_34/final)
Target: x86_64-unknown-linux-gnu
Thread model: posix
Found candidate GCC installation: /usr/lib/gcc/x86_64-redhat-linux/4.8.2
Found candidate GCC installation: /usr/lib/gcc/x86_64-redhat-linux/4.8.5
Selected GCC installation: /usr/lib/gcc/x86_64-redhat-linux/4.8.5
"/afs/cs.cmu.edu/academic/class/15740-f15/scratch/compiler/bin/clang-3.4" -cc1 -triple x86_64-unknown-linux-gnu -emit-obj -mrelax-all -disable-free -disable-llvm-verifier -main-file-name test.c -mrelocation-model static -mdisable-fp-elim -fmath-errno -masm-verbose -mconstructor-aliases -munwind-tables -fuse-init-array -target-cpu x86-64 -v -resource-dir /afs/cs.cmu.edu/academic/class/15740-f15/scratch/compiler/bin/../lib/clang/3.4.1 -c-isystem /afs/cs.cmu.edu/academic/class/15740-f15/scratch/compiler/include -c-isystem /afs/cs.cmu.edu/academic/class/15740-f15/scratch/compiler/include -c-isystem . -cxx-isystem /afs/cs.cmu.edu/academic/class/15740-f15/scratch/compiler/include -cxx-isystem /afs/cs.cmu.edu/academic/class/15740-f15/scratch/compiler/include -cxx-isystem . -internal-isystem /usr/local/include -internal-isystem /afs/cs.cmu.edu/academic/class/15740-f15/scratch/compiler/bin/../lib/clang/3.4.1/include -internal-isystem /afs/cs.cmu.edu/academic/class/15740-f15/scratch/compiler/bin/../lib/clang/3.4.1/include/clang -internal-externc-isystem /include -internal-externc-isystem /usr/include -fdebug-compilation-dir /afs/cs.cmu.edu/academic/class/15740-f15/scratch -ferror-limit 19 -fmessage-length 0 -fcilkplus -mstackrealign -fobjc-runtime=gcc -fdiagnostics-show-option -vectorize-slp -o /tmp/test-adc0b6.o -x c test.c
clang -cc1 version 3.4.1 based upon LLVM 3.4.1 default target x86_64-unknown-linux-gnu
ignoring nonexistent directory "/afs/cs.cmu.edu/academic/class/15740-f15/scratch/compiler/bin/../lib/clang/3.4.1/include/clang"
ignoring nonexistent directory "/include"
ignoring duplicate directory "/afs/cs.cmu.edu/academic/class/15740-f15/scratch/compiler/include"
#include "..." search starts here:
#include <...> search starts here:
/afs/cs.cmu.edu/academic/class/15740-f15/scratch/compiler/include
.
/usr/local/include
/afs/cs.cmu.edu/academic/class/15740-f15/scratch/compiler/bin/../lib/clang/3.4.1/include
/usr/include
End of search list.
"/bin/ld" --eh-frame-hdr -m elf_x86_64 -dynamic-linker /lib64/ld-linux-x86-64.so.2 -o test /usr/lib/gcc/x86_64-redhat-linux/4.8.5/../../../../lib64/crt1.o /usr/lib/gcc/x86_64-redhat-linux/4.8.5/../../../../lib64/crti.o /usr/lib/gcc/x86_64-redhat-linux/4.8.5/crtbegin.o -L/usr/lib/gcc/x86_64-redhat-linux/4.8.5 -L/usr/lib/gcc/x86_64-redhat-linux/4.8.5/../../../../lib64 -L/lib/../lib64 -L/usr/lib/../lib64 -L/usr/lib/gcc/x86_64-redhat-linux/4.8.5/../../.. -L/lib -L/usr/lib /tmp/test-adc0b6.o -L/afs/cs.cmu.edu/academic/class/15740-f15/scratch/compiler/lib -L/afs/cs.cmu.edu/academic/class/15740-f15/scratch/compiler/lib -L. -lcilkrts -lgcc --as-needed -lgcc_s --no-as-needed -lc -lgcc --as-needed -lgcc_s --no-as-needed /usr/lib/gcc/x86_64-redhat-linux/4.8.5/crtend.o /usr/lib/gcc/x86_64-redhat-linux/4.8.5/../../../../lib64/crtn.o
/afs/cs.cmu.edu/academic/class/15740-f15/scratch/compiler/lib/libcilkrts.so: undefined reference to `__cilkrts_xchg'
/afs/cs.cmu.edu/academic/class/15740-f15/scratch/compiler/lib/libcilkrts.so: undefined reference to `sysdep_save_fp_ctrl_state'
/afs/cs.cmu.edu/academic/class/15740-f15/scratch/compiler/lib/libcilkrts.so: undefined reference to `__cilkrts_short_pause'
/afs/cs.cmu.edu/academic/class/15740-f15/scratch/compiler/lib/libcilkrts.so: undefined reference to `restore_x86_fp_state'
clang-3.4: error: linker command failed with exit code 1 (use -v to see invocation)
Any help would be appreciated. (Oh, and the src for test.c is:
#include <cilk/cilk.h>
#include <assert.h>
int fib(int n) {
if (n < 2)
return n;
int a = cilk_spawn fib(n-1);
int b = fib(n-2);
cilk_sync;
return a + b;
}
int main() {
int result = fib(30);
assert(result == 832040);
return 0;
}
Thanks!