qt creator - CMake Warning: You have called ADD_LIBRARY for library my_src without any source files -

i'm trying call add_library files endings.

the dir structure is:

src   | - cmakelists.txt (1)  | - main.cpp  | - gui       | - cmakelists.txt (2)       | - source , header files 

so cc files in gui directory.

(1) cmakelists.txt:

file( glob_recurse my_sources *.cc )  message(status "my_sources = ${my_sources}") add_subdirectory( gui ) add_library( my_src ${my_sources} )  target_link_libraries( my_src   my_gui ) qt5_use_modules( my_src core gui widgets) 

(2) cmakelists.txt:

file( glob my_gui_sources *.cc)  add_library( my_gui ${my_gui_sources} ) qt5_use_modules( my_gui core gui widgets) 

but keep getting output:

you have called add_library library my_src without source files. typically indicates problem cmakelists.txt file -- my_sources = /home/bla/bla/src/gui/borderlayout.cc;...;/home/bla/bla/my/src/gui/mainwindow.cc -- my_gui_sources = /home/bla/bla/my/src/gui/borderlayout.cc;...;/home/bla/bla/my/src/gui/mainwindow.cc -- configuring done -- generating done -- build files have been written to: /home/bla/bla/my/build 

i know don't need add_library in first cmakelists.txt, later will. changed first glob glob_recurse, finds @ least anything.

for reason

file( glob my_gui_sources *.cc *.h) 

is not finding file. debug, can print:

message(status "my_gui_sources = ${my_gui_sources}") 

probably want use glob_recurse, search in sub-directories:

file( glob_recurse my_gui_sources *.cc *.h) 

note don't need add headers files source list.

take care have rerun cmake every time add file project (cmake won't called automatically, thing instead happens if touch 1 of cmake files).

link documentation of command "file"

edit:

the actual problem in first cmakelists.txt file using inconsistent naming variable (note casing important), therefore have change add_library command to:

add_library( my_src ${my_sources} ) 

note (off records :-) ): fact casing important variable names might confusing because, on other hand, in cmake command names case insensitive. it's weird notice character - (minus) might used part of variable name: using _ (underscore) of time preferable.