What does "collect2: ld returned 1 exit status" mean?

ahmed kato

what is :: error: collect2: ld returned 1 exit status???

dangelog

You have to provide much more information.

giesbert

First of all, this is not a qt error, itÄs a linker error of the mingw / gcc tool chain.
ld is the linker of mingw/gcc.
I assume, that one or more dlls are not found or that some functions have no body...
But for more information, you must provide more input

goetz

Assuming that you work with Qt Creator, the error message you stated is on the "build problems" tab. You should switch to the "compilation" tab (the 4th tab), where the full length linker and error output is collected. There you should find the class names wich are missing to the linker (which is most likely the cause of your problem).

ahmed kato

thank u very much =)

tahere

Hi whenever i inlcude a header to one of my .c files in NS2, for attach XFUZZY in NS, i get this error: collect2: ld returned 1 exit status.
any help would be much appreciated!

result of make command:

mac/802_11e/mac-802_11e.o: In function Mac802_11e::send(Packet*, Handler*)': mac-802_11e.cc:(.text+0x1e31): undefined reference to first_sys::inference(double, double, double, double, double*)'
mac/802_11e/mac-802_11e.o: In function first_sys::first_sys()': mac-802_11e.cc:(.text._ZN9first_sysC1Ev[first_sys::first_sys()]+0x16): undefined reference to vtable for first_sys'
mac/802_11e/mac-802_11e.o: In function first_sys::~first_sys()': mac-802_11e.cc:(.text._ZN9first_sysD1Ev[first_sys::~first_sys()]+0xb): undefined reference to vtable for first_sys'
collect2: ld returned 1 exit status
make: *** [ns] Error 1

DerManu

How does your .pro look? Do you tell qmake to link to the libs properly?

tahere

I have not using from qmake, I want to attach xfuzzy code produced by xfuzzy software in NS2, network simulator; but when I search about my error, I find this page.
can u help me?

DerManu

It seems like you're missing a function definition for first_sys::inference. Further there seem to be missing objects/libraries that contain "first_sys".
I'd ask in respective fora of those libraries. This is a Qt forum so on this issue we can only give this general help about typical linking errors.

iHad169

sudo apt install libgl-dev libglu-dev libglib2.0-dev libsm-dev libxrender-dev libfontconfig1-dev libxext-dev

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