CMake: Add basic CMake build system

Introduce an initial CMake buildsystem. This build system can build
a fully working apt system without translation or documentation.

The FindBerkelyDB module is from kdelibs, with some small adjustements
to also look in db5 directories.

Initial work on this CMake build system started in 2009, and was
resumed in August 2016.

1 files changed, 65 insertions, 0 deletions

diff --git a/CMake/Misc.cmake b/CMake/Misc.cmake
new file mode 100644
index 000000000..584a4da2a
--- /dev/null
+++ b/CMake/Misc.cmake
@@ -0,0 +1,65 @@
+include(CheckCXXCompilerFlag)
+
+# Flatten our header structure
+function(flatify target headers)
+    foreach(header ${headers})
+        get_filename_component(tgt ${header} NAME)
+        configure_file(${header} ${target}/${tgt} @ONLY)
+    endforeach(header ${headers})
+endfunction()
+
+
+function(add_optional_compile_options flags)
+    foreach(flag ${flags})
+        check_cxx_compiler_flag(-${flag} have-compiler-flag:-${flag})
+        if (have-compiler-flag:-${flag})
+            add_compile_options("-${flag}")
+        endif()
+    endforeach()
+endfunction()
+
+# Substitute vendor references in a file
+function(add_vendor_file)
+    set(options)
+    set(oneValueArgs OUTPUT INPUT MODE)
+    set(multiValueArgs VARIABLES)
+    cmake_parse_arguments(AVF "${options}" "${oneValueArgs}" "${multiValueArgs}" ${ARGN})
+    message(STATUS "Configuring vendor file ${AVF_OUTPUT}")
+
+    FILE(READ ${CMAKE_CURRENT_SOURCE_DIR}/${AVF_INPUT} input)
+    foreach(variable ${AVF_VARIABLES})
+        execute_process(COMMAND ../vendor/getinfo ${variable} OUTPUT_VARIABLE value OUTPUT_STRIP_TRAILING_WHITESPACE)
+        string(REPLACE "&${variable};" "${value}" input "${input}")
+    endforeach()
+    file(WRITE ${CMAKE_CURRENT_BINARY_DIR}/${AVF_OUTPUT} "${input}")
+
+    execute_process(COMMAND chmod ${AVF_MODE} ${CMAKE_CURRENT_BINARY_DIR}/${AVF_OUTPUT})
+endfunction()
+
+# Add symbolic links to a file
+function(add_slaves destination master)
+    set(slaves "")
+    foreach(slave ${ARGN})
+        add_custom_command(OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/${slave}
+                           COMMAND ${CMAKE_COMMAND} -E create_symlink ${master} ${CMAKE_CURRENT_BINARY_DIR}/${slave})
+        list(APPEND slaves ${CMAKE_CURRENT_BINARY_DIR}/${slave})
+    endforeach()
+
+    STRING(REPLACE "/" "-" master "${master}")
+    add_custom_target(${master}-slaves ALL DEPENDS ${slaves})
+    install(FILES ${slaves} DESTINATION ${destination})
+endfunction()
+
+# Generates a simple version script versioning everything with current SOVERSION
+function(add_version_script target)
+    get_target_property(soversion ${target} SOVERSION)
+    set(script "${CMAKE_CURRENT_BINARY_DIR}/${target}.versionscript")
+    string(REPLACE "-" "" name "${target}_${soversion}")
+    string(TOUPPER "${name}" name)
+    add_custom_command(OUTPUT "${script}"
+                       COMMAND echo "${name} {global: *; };" > "${script}"
+                       VERBATIM )
+    add_custom_target(${target}-versionscript DEPENDS "${script}")
+    target_link_libraries(${target} PRIVATE -Wl,-version-script="${script}")
+    add_dependencies(${target} ${target}-versionscript)
+endfunction()