[CMake] Simple (?) lib linking question

[Anders Sundman]

> At 04:08 AM 8/4/2006, Anders Sundman wrote:
>>Shouldn't the line:
>>-> C:\MinGW\bin\g++.exe    -shared -o liba.dll
>> -Wl,--out-implib,liba.dll.a "CMakeFiles/a.dir/a.obj" -lb
>>
>>also contain a -L switch since I have the line
>> "LINK_DIRECTORIES(${TEST_SOURCE_DIR}/b)" in the cmake file for the
>> "a"-lib?
>>
>>// Anders Sundman
>
> It is an ordering problem, you have this:
>
> ADD_LIBRARY(liba SHARED liba.cpp)
> INCLUDE_DIRECTORIES(${TEST_SOURCE_DIR}/libb)
> LINK_DIRECTORIES(${TEST_SOURCE_DIR}/libb)
> TARGET_LINK_LIBRARIES(liba libb)
>
> The LINK_DIRECTORIES command has to come before the ADD_LIBRARY command.
>
> -Bill
>

Thank you so much! That was it; now I get the -L option I expected.

The example still doesn't compile though :) There seems to be one more
problem with it, possibly related.

It goes like this: app uses lib a that uses lib b. I have lib b, can
compile lib a, but when it's time to compile the app, the following build
command is generated by cmake:

C:\MinGW\bin\g++.exe "CMakeFiles/app.dir/app.obj" -o ../app.exe
-Lc:\dev\lab\cmtest2\build\a -Lc:\dev\lab\cmtest2\build -la -lb

But the "-lb" option shouldn't be there. The app doesn't want to know
about the b lib. If I manually remove it and compile "by hand" then it
works fine.

The cmakelists file for the app never mentions the b lib, so why does
cmake put the -lb option there?

This is the entire cmakelists file for the app directory:

INCLUDE_DIRECTORIES(${TEST_SOURCE_DIR}/a)
LINK_DIRECTORIES(${TEST_BINARY_DIR}/a)
ADD_EXECUTABLE(app app.cpp)
TARGET_LINK_LIBRARIES(app a)

The complete (minimal) example is attached.

Best Regards,
Anders Sundman
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