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

[Mike Hommey]

$ 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...

[Mike Hommey (mh-glandium)]

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