Static only build fails

[rahul-bedarkar]

Hello,

I'm trying to add LetMeCreate package in Buildroot. While testing it in static only environment, build fails with following errors.

rahul@rahul-Aspire-4736Z:~/upstream/LetMeCreate/build$ cmake .. -DBUILD_SHARED=OFF
-- The C compiler identification is GNU 5.4.0
-- The CXX compiler identification is GNU 5.4.0
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Configuring done
-- Generating done
-- Build files have been written to: /home/rahul/upstream/LetMeCreate/build

rahul@rahul-Aspire-4736Z:~/upstream/LetMeCreate/build$ make
Scanning dependencies of target letmecreate_core_s
[ 1%] Building C object CMakeFiles/letmecreate_core_s.dir/src/core/uart.c.o
In file included from /home/rahul/upstream/LetMeCreate/src/core/uart.c:9:0:
/home/rahul/upstream/LetMeCreate/include/letmecreate/core/common.h:17:37: fatal error: letmecreate/core/export.h: No such file or directory
compilation terminated.
CMakeFiles/letmecreate_core_s.dir/build.make:62: recipe for target 'CMakeFiles/letmecreate_core_s.dir/src/core/uart.c.o' failed
make[2]: *** [CMakeFiles/letmecreate_core_s.dir/src/core/uart.c.o] Error 1
CMakeFiles/Makefile2:67: recipe for target 'CMakeFiles/letmecreate_core_s.dir/all' failed
make[1]: *** [CMakeFiles/letmecreate_core_s.dir/all] Error 2
Makefile:127: recipe for target 'all' failed
make: *** [all] Error 2

Thanks,
Rahul

Hello Rahul,
CMake generates the export files:

./include/letmecreate/rpisensehat/export.h
./include/letmecreate/click/export.h
./include/letmecreate/core/export.h
./include/letmecreate/bosch/export.h

Can you try running cmake . -DBUILD_SHARED=OFF from ~/upstream/LetMeCreate ? I suspect running it from a subdirectory does not work.

François

[rahul-bedarkar]

Running cmake in source directory didn't help, it is failing with same error. Probably you have CMake generated files present from previous configuration.

generate_export_header() is only called if BUILD_SHARED is set. So CMake won't be generating export headers in case of static only builds.

I think export headers are only meant to be used in shared library cases as static libraries are just archive of object files where there is no visibility.