[ECOS] Building and linking Static library with the eCos executable.

[ECOS] Building and linking Static library with the eCos executable.

[jawad rehman]

Hi there,

I have a problem in to add a static library with an application
executable for eCos. Actually I have two projects and have made three
cmake files for both the project. One is to include the sub folders
for the projects and second  is for the project to create a static
library by using cmake add_library statement and third cmake file is
for the other project to build the executable for the eCos where I am
link the the static library but I got the following errors;

Linking CXX executable helloDemo.elf
CMakeFiles/helloDemo.dir/demo.o: In function `main':
CMakeFiles/helloDemo.dir/demo.o(.text+0x19): undefined reference to
`Hello::Print()'
collect2: ld returned 1 exit status
make[2]: *** [Demo/helloDemo.elf] Error 1
make[1]: *** [Demo/CMakeFiles/helloDemo.dir/all] Error 2
make: *** [all] Error 2

I think the eCos "USEECOS" include does not support the add_library
statement. Is  there any way to create a static libray for the eCos
executable or some thing like add_library .

Following are the list files.

1)      CMakeList.txt in the root folder which include sub folders for the
build.

project (HELLO)
add_subdirectory (Hello)
add_subdirectory (Demo)

2). CMakeList.txt in the hello project to build a static library.
add_library (Hello hello.cxx)

3.  CMakeList.txt in the demo project to build an eCos executable .
 include(UseEcos)
include_directories (${HELLO_SOURCE_DIR}/Hello)
link_directories (${HELLO_BINARY_DIR}/Hello)
ECOS_ADJUST_DIRECTORY(target_SRCS ${SRC_LIST})
ECOS_ADD_INCLUDE_DIRECTORIES()
ECOS_USE_I386_ELF_TOOLS()
ECOS_ADD_EXECUTABLE(helloDemo demo.cxx demo_b.cxx)
target_link_libraries (helloDemo Hello)

Please provide some advise, it would really be appreciated.

Regards.
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Re: [ECOS] Building and linking Static library with the eCos executable.

[Andrew Lunn]

On Thu, Jun 26, 2008 at 03:07:45PM +0500, jawad rehman wrote:
> Hi there,
> 
> I have a problem in to add a static library with an application
> executable for eCos. Actually I have two projects and have made three
> cmake files for both the project. One is to include the sub folders
> for the projects and second  is for the project to create a static
> library by using cmake add_library statement and third cmake file is
> for the other project to build the executable for the eCos where I am
> link the the static library but I got the following errors;

eCos does not use cmake makefiles. This is not an eCos problem. I
suggest you try on the cmake mailing lists.

        Andrew

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Re: [ECOS] Building and linking Static library with the eCos executable.

[Alexander Neundorf]

On Thursday 26 June 2008, jawad rehman wrote:
> Hi there,
>
> I have a problem in to add a static library with an application
> executable for eCos. Actually I have two projects and have made three
> cmake files for both the project. One is to include the sub folders
> for the projects and second  is for the project to create a static
> library by using cmake add_library statement and third cmake file is
> for the other project to build the executable for the eCos where I am
> link the the static library but I got the following errors;
>
> Linking CXX executable helloDemo.elf
> CMakeFiles/helloDemo.dir/demo.o: In function `main':
> CMakeFiles/helloDemo.dir/demo.o(.text+0x19): undefined reference to
> `Hello::Print()'
> collect2: ld returned 1 exit status
> make[2]: *** [Demo/helloDemo.elf] Error 1
> make[1]: *** [Demo/CMakeFiles/helloDemo.dir/all] Error 2
> make: *** [all] Error 2
>
> I think the eCos "USEECOS" include does not support the add_library
> statement. Is  there any way to create a static libray for the eCos
> executable or some thing like add_library .
>
> Following are the list files.
>
> 1)      CMakeList.txt in the root folder which include sub folders for the
> build.
>
> project (HELLO)
> add_subdirectory (Hello)
> add_subdirectory (Demo)
>
> 2). CMakeList.txt in the hello project to build a static library.
> add_library (Hello hello.cxx)
>
> 3.  CMakeList.txt in the demo project to build an eCos executable .

This CMakeLists.txt is basically correct. The problem is that you build only 
the executable for eCos, the library is built for the build host. 
So I would suggest to put the following three lines after the project() 
command in the top level CMakeLists.txt.

> include(UseEcos)
> ECOS_ADD_INCLUDE_DIRECTORIES()
> ECOS_USE_I386_ELF_TOOLS()

> include_directories (${HELLO_SOURCE_DIR}/Hello)
> link_directories (${HELLO_BINARY_DIR}/Hello)

You don't need this line, this is only when you use the "complex" directory 
layout as described in http://www.linuxdevices.com/articles/AT6762290643.html
> ECOS_ADJUST_DIRECTORY(target_SRCS ${SRC_LIST})

> ECOS_ADD_EXECUTABLE(helloDemo demo.cxx demo_b.cxx)
> target_link_libraries (helloDemo Hello)
>
> Please provide some advise, it would really be appreciated.

If these hints don't help, please let me know. 
In that case please do 
"make clean; make VERBOSE=1" and post the output, so I can see what's 
happening.

Alex

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