Undefined reference to 'XtInitialize'

Question

I am trying to compile and link an Athena Xt program on Ubuntu linux.

I have compiled program into an object file but I am unable to link it with Xt library no matter what.

My linker call is

ld /usr/lib/x86_64-linux-gnu/libXt.a program.o

I am getting this linker error

program.o: In function `main':
program.c:(.text+0x37): undefined reference to `XtInitialize'
program.c:(.text+0x42): undefined reference to `commandWidgetClass'
program.c:(.text+0x5e): undefined reference to `XtCreateManagedWidget'
program.c:(.text+0x75): undefined reference to `XtStrings'
program.c:(.text+0x7d): undefined reference to `XtAddCallback'
program.c:(.text+0x89): undefined reference to `XtRealizeWidget'
program.c:(.text+0x8e): undefined reference to `XtMainLoop'

I probed Xt library with nm and symbols are there:

nm /usr/lib/x86_64-linux-gnu/libXt.a | grep XtInitialize
                 U _XtInitializeActionData
0000000000000360 T XtInitializeWidgetClass
00000000000018b0 T XtInitialize
                 U XtInitializeWidgetClass
00000000000006d0 T _XtInitializeActionData
                 U XtInitializeWidgetClass

Any idea what's wrong?

Possible duplicate of [Why does the order of '-l' option in gcc matter?](http://stackoverflow.com/questions/11893996/why-does-the-order-of-l-option-in-gcc-matter) — n. m. could be an AI, Nov 12 '15 at 21:17

score 1 · Answer 1 · answered Nov 09 '15 at 20:50

1

Try:

ld  program.o /usr/lib/x86_64-linux-gnu/libXt.a

argument order to ld matters, it expects to find the library after the object file with the reference.

answered Nov 09 '15 at 20:50

Sasha Pachev

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Undefined reference to 'XtInitialize'

1 Answers1