"Multiple definition" build failure(s) — clang 3.9.1

Final link is failing because of the extern __inline__ declaration.
Example:
// plop1.c
extern __inline__ void plop() { }
// plop2.c
extern __inline__ void plop() { }
// foo.c
int main () { }
# Makefile
CC=clang
all:
	$(CC) -c plop1.c plop2.c foo.c
	$(CC) -o plop foo.o plop1.o plop2.o
PackageVersionSupposed error messageFull log Bug report
baycomepp 0.10-15sysdeps.h:223: multiple definition of `gettime' Log
baycomusb 0.10-14sysdeps.h:146: multiple definition of `gettime' Log
fdclone 3.01b-1sigset.h:117: multiple definition of `__sigaddset' Log

3 errors