On Wed, 10 May 2006, Brad King wrote:
[EMAIL PROTECTED] wrote:
I'm using CMake in the following way:
What version of CMake are you using?
2.0.5
- I create a simple shared library
- The library requires many libraries during the built process
Please be more specific. Are the other libraries shared or static?
shared
- In the subdirectory (using the SUBDIRS command) I create examples,
which are dependent on this shared library.
What is the problem:
- When building the examples in the subdirectory, all the required
libraries are linked to these examples. I know, that these examples
require only my shared library. Since CMake inherits linking dependencies
I cannot avoid linking all the libraries, which were necessary when
builing my library, to these simple examples.
The dependency chaining is necessary for static libraries on all platforms
and even shared libraries on some platforms.
It is shared library. A simple example of CMakeLists.txt is attached to
this mail. If you create a simple Makefile, you'll see the chaining of all
the libraries despite 'example' target should be dependent only on
'mylib'.
-David
My guess is that you are building static "convenience" libraries and linking
them together into a single shared library. This is not really supported by
CMake as it does not really make sense on all platforms (a set of .lib
archives on windows cannot be used to create a .dll). It also does not work
on most UNIX environments unless the objects in the static archives are built
with the -fPIC or equivalent flag.
What is your use case here? If the shared library provides everything why
can't you just build all the sources in one target?
-Brad
# project name
PROJECT (MY_PROJECT)
# build shared/static library
OPTION (BUILD_SHARED_LIBS "Static/Shared library" ON)
SET(MYLIBNAME mylib)
SET(SOURCES main.cc)
FIND_LIBRARY(TIFF tiff /usr/lib /usr/local/lib)
FIND_LIBRARY(JPEG jpeg /usr/lib /usr/local/lib)
ADD_LIBRARY(${MYLIBNAME} ${SOURCES})
TARGET_LINK_LIBRARIES(${MYLIBNAME} ${TIFF} ${JPEG})
ADD_EXECUTABLE(example example.cc)
TARGET_LINK_LIBRARIES(example ${MYLIBNAME})
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