gcc linkage problems

[Dave Joseph]

I'm trying to link with a static library and keep getting undefined
references to symbols that are defined in the library. The library is
called libmwunit.a and is located in /app/tp/mw/lib, I'm using the
following link step:

g++ -o target -static -L/app/tp/mw/lib -lmwunit TestConsumer.o
TestApp.o

TestApp.o and TestConsumer.o are part of my test harness and target is
the executable I am trying to produce. I have extracted objects from
the archive to check that the symbols exist – they do – and I can link
directly with them. I've also tried various other combinations of
ordering for libraries objects with and without the static specifier.

Some of the unresolved linkage errors are marked as [in-charge] others
as [not in-charge], I don't know what this means.

I am using gcc 3.2.1 and ld 2.11.90.0.8

 

[Attila Feher]

I'm trying to link with a static library and keep getting undefined
references to symbols that are defined in the library. The library is

[SNIP]

http://www.parashift.com/c++-faq-lite/how-to-post.html#faq-5.9

http://www.slack.net/~shiva/welcome.txt

 

[Rolf Magnus]

xpost and f'up2 gnu.g++.help, since that question is off-topic here.

I'm trying to link with a static library and keep getting undefined
references to symbols that are defined in the library. The library is
called libmwunit.a and is located in /app/tp/mw/lib, I'm using the
following link step:

g++ -o target -static -L/app/tp/mw/lib -lmwunit TestConsumer.o
TestApp.o

The order matters. With your command line, the linker first opens
libmwunit, but doesn't find any symbol there that it needs. So it
unloads that library and goes on. Then TestConsumer and TestApp are
linked, using some symbols that are not defined there. The linker
remembers them as unresolved and goes on, but since there is nothing
afterward, those symbols stay unresolved.

Try:

g++ -o target -static -L/app/tp/mw/lib TestConsumer.o TestApp.o -lmwunit

giving the linker a chance to use the lib to resolve the missing symbols
from your .o files.

TestApp.o and TestConsumer.o are part of my test harness and target is
the executable I am trying to produce. I have extracted objects from
the archive to check that the symbols exist – they do – and I can link
directly with them. I've also tried various other combinations of
ordering for libraries objects with and without the static specifier.

Probably you didn't try the right one