I try to compile tools/usb foler, but got below error(gcc version 4.6.3): tools/usb/testusb.c:516: undefined reference to `pthread_create' tools/usb/testusb.c:541: undefined reference to `pthread_join' The reason is the makefile puts source files behind of compiler option "-l". For gcc(and clang), it reads compiler options in order from left to right. When compiler gets a source file, it starts parsing it and try to resolve all symbols invoked. If compiler can not resolve a symbol, it will read --remain-- options and try get a definition of the symbol. So, if we put source file behind of "-l" option, the specified library will not work. Signed-off-by: Du Changbin <changbinx.du@xxxxxxxxx> --- tools/usb/Makefile | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tools/usb/Makefile b/tools/usb/Makefile index 396d6c4..e1cfd19 100644 --- a/tools/usb/Makefile +++ b/tools/usb/Makefile @@ -7,7 +7,7 @@ CFLAGS = $(WARNINGS) -g $(PTHREAD_LIBS) -I../include all: testusb ffs-test %: %.c - $(CC) $(CFLAGS) -o $@ $^ + $(CC) $^ $(CFLAGS) -o $@ clean: $(RM) testusb ffs-test -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
