CMAKE Samples

• CMAKE Samples
• Description
• Samples
  • -app
  • -library
  • -external_libs
  • -misc
• TODOs
• Tips
  • Set a variable
  • Print general info
  • Show all variables
  • Generate targets
  • Generate compiler files

Description

CMake examples of daily use.

Samples

01-app

Single file to multiple files application alongwith setting up a specific version of CXX version.

• 101:

  • A very basic cmake application.

• 102:

  • A very basic cmake application with an option to set build type.

• 103:

  • Hello world app to instruct where to install executables.

• 104:

  • Build & install application having multiple source files.

• 105:

  • Build & install application having multiple sources files + private header.

• 106:

  • Build & install application having multiple sources files + private header + version file generated by cmake template.

• 107:

  • A hello-world of std::cxx14.

02-library

Create static and shared libraries and how to use these libraries with application in different ways.

• 201:

  • A static library using std::cxx14.

• 202:

  • A shared library using std::cxx14.
  • Also see 211

• 203:

  • An application using a static library (direct linking).

• 204:

  • An application using a shared library (direct linking).

• 205:

  • An application using a libary via .pc (using pkg-config)
  • pkg-config can be referred to static or shared library.

• 206:

  • Generate .cmake file for a library (static).

• 207:

  • An application using a static library (using .cmake).
  • TODO: Inherit compiler specific flags from library just like pkg-config can do that.

• 208:

  • Generate .cmake file for a library (shared library).

• 209:

  • An application using a shared library (using .cmake).
  • TODO: Inherit compiler specific flags from library just like pkg-config can do that.

• 210:

  • A single project to build shared and static lib (pkg-config, .cmake).

• 211:

  • An enhanced version of 202. Generator expressions are used.

03-external_libs

Use 3rd party libraries in an application.

• 301:
  • A hello-world using cmake.BOOST.

04-misc

Miscellaneous usages.

• 401:

  • Application packaging using cpack.

• 402:

  • How to use cmake custom command and target interfaces.
    • add_custom_command links to different stages of build PRE_BUILD, PRE_LINK, POST_BUILD
    • Link add_custom_command with custom target.

• 403:

  • ExternalProject: Create custom targets to build projects in external trees.

• 404:

  • ExternalProject: Pull GoogleTest (gtest) as cmake external project.

TODOs

• Linking of protobuf, flatbuffers and nanopb via cmake.

Tips

Set a variable

set(TEST_VAR "value")               # Overwrite old value if it set
set(TEST_VAR "${TEST_VAR} value")   # Append  new value to old

Print general info

message("-----------------------------------------------------------")
message("Lib Version            : ${VERSION_STRING}")
message("Compiler Id            : ${CMAKE_CXX_COMPILER_ID}")
message("Compiler (c) version   : ${CMAKE_C_COMPILER_VERSION}")
message("Compiler (cxx) version : ${CMAKE_CXX_COMPILER_VERSION}")
message("-----------------------------------------------------------")

Show all variables

##
message("+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++")
# Get all variables as a list
get_cmake_property(varList VARIABLES)

# Filter variable to have only those starting with our required package
list(FILTER varList INCLUDE REGEX "^sample_lib*")
message("Variables associated to sample_lib are: ")
foreach (_variableName ${varList})
    message("    ${_variableName}=${${_variableName}}")
endforeach()
message("+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++")
##

Generate targets

• Show all targets generated by cmake for a project

cmake --build /path/to/build/folder --target help

• Run a specific target

cmake --build /path/to/build/folder --target <target_name>

Generate compiler files

• Save compiler intermediate files

set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} --save-temps")