Le mardi 06 septembre 2016 à 08:30 +0800, 彭怀敏 a écrit :
> Hi, I am using Ubuntu16.04, with GNU make 4.1.
> I was failed while built my project which referenced to libpthread
> and libm, but it was OK while used Ubuntu10.04 with GNU make 3.81.
> I found the difference of the "strace make" output between the two
> versions of make, that LD will open libpthread after open libc in
> v3.81, but it will not open libpthread in v4.1, and thus I got a lot
> of "undefined reference to", and "collect2: error: ld returned 1 exit
> status".
>
It's likely not related to make: your toolchains (binutils, gcc) and
libraries are differents between Ubuntu from 2010 and Ubuntu from 2014.
> Here is part of my makefile, a simple makefile:
>
> OBJS = median.o EventParam.o Filter.o OtdrAlgo.o Otdr.o \
> OtdrEdma.o OtdrMain.o OtdrTable.o NetworkSocket.o \
> Utility.o OtdrTouch.o Event.o
>
> CFLAGS = -g -Wall
> LDFLAGS = -lm -lpthread
>
-lm -lpthread should not be in variable $(LDFLAGS) as it's passed
before the object file to link.
For example, put them in $(LIBS)
LIBS := -lm -lpthread
> #CROSS_COMPILE = /opt/itop/4.3.2/bin/arm-linux-
>
> linuxotdr: $(OBJS)
> $(CROSS_COMPILE)gcc $(CFLAGS) $(LDFLAGS) -o $@ $^
>
Libraries should be listed after the object files that might need them:
With the previous change, use recipe instead:
$(CROSS_COMPILE)gcc $(CFLAGS) $(LDFLAGS) -o $@ $^ $(LIBS)
> Event.o : Event.c Otdr.h prototypes.h protocol.h DspFpgaReg.h
> $(CROSS_COMPILE)gcc -c $(CFLAGS) $^
> .........
>
> I don't know how to solve it, could you help me?
> Thanks very much.
>
>
Regards.
--
Yann Droneaud
OPTEYA
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