[Bug 995787] Re: ld discards -lrt despite clock_gettime being used, and wrongfully fails to link

Mike Hommey mh at glandium.org
Mon May 7 06:38:20 UTC 2012


Forget it, it's an ordering problem. (And I can't find how to close a
bug)

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https://bugs.launchpad.net/bugs/995787

Title:
  ld discards -lrt despite clock_gettime being used, and wrongfully
  fails to link

Status in “binutils” package in Ubuntu:
  New

Bug description:
  $ cat > test.c <<EOF
  #include <time.h>
  int main() {
  struct timespec ts;
  clock_gettime(CLOCK_MONOTONIC, &ts);
  return 0;
  }
  EOF

  $ gcc -o test -lrt test.c
  test.c:(.text+0x15): undefined reference to `clock_gettime'

  Adding -Wl,--no-as-needed before -lrt makes it link. Using gold
  instead of BFD ld also makes it link. There is no reason why -Wl,--as-
  needed -lrt (--as-needed being the ubuntu default) should drop -lrt
  when one of its symbol is used, especially when dropping it makes the
  linkage fail...

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