build: Refactor CMake modules

This moves the CMake build logic out of the source tree and splits it
up into a more modular form. The tests now have a CMakeLists.txt file
in their respective source directory.

Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks>
Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>

1 files changed, 74 insertions, 0 deletions

diff --git a/cmake/utils/FindProtobufC.cmake b/cmake/utils/FindProtobufC.cmake
new file mode 100644
index 00000000..ff892b5b
--- /dev/null
+++ b/cmake/utils/FindProtobufC.cmake
@@ -0,0 +1,74 @@
+function(PROTOBUF_GENERATE_C SRCS HDRS)
+  if (NOT ARGN)
+    message(SEND_ERROR "Error: PROTOBUF_GENERATE_C() called without any proto files")
+    return()
+  endif ()
+
+  if (PROTOBUF_GENERATE_C_APPEND_PATH)
+    # Create an include path for each file specified
+    foreach (FIL ${ARGN})
+      get_filename_component(ABS_FIL ${FIL} ABSOLUTE)
+      get_filename_component(ABS_PATH ${ABS_FIL} PATH)
+      list(FIND _protobuf_include_path ${ABS_PATH} _contains_already)
+      if (${_contains_already} EQUAL -1)
+        list(APPEND _protobuf_include_path -I ${ABS_PATH})
+      endif ()
+    endforeach ()
+  else ()
+    set(_protobuf_include_path -I ${CMAKE_CURRENT_SOURCE_DIR})
+  endif ()
+
+  set(${SRCS})
+  set(${HDRS})
+  foreach(FIL ${ARGN})
+    get_filename_component(ABS_FIL ${FIL} ABSOLUTE)
+    get_filename_component(FIL_WE ${FIL} NAME_WE)
+
+    list(APPEND ${SRCS} "${CMAKE_CURRENT_BINARY_DIR}/${FIL_WE}.pb-c.c")
+    list(APPEND ${HDRS} "${CMAKE_CURRENT_BINARY_DIR}/${FIL_WE}.pb-c.h")
+
+    add_custom_command(
+      OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/${FIL_WE}.pb-c.c"
+      "${CMAKE_CURRENT_BINARY_DIR}/${FIL_WE}.pb-c.h"
+      COMMAND  ${PROTOBUF_PROTOC_C_EXECUTABLE}
+      ARGS --c_out=${CMAKE_CURRENT_BINARY_DIR} ${_protobuf_include_path} ${ABS_FIL}
+      DEPENDS ${ABS_FIL} ${PROTOBUF_PROTOC_C_EXECUTABLE}
+      COMMENT "Running C protocol buffer compiler on ${FIL}"
+      VERBATIM )
+  endforeach()
+
+  set_source_files_properties(${${SRCS}} ${${HDRS}} PROPERTIES GENERATED TRUE)
+  set(${SRCS} ${${SRCS}} PARENT_SCOPE)
+  set(${HDRS} ${${HDRS}} PARENT_SCOPE)
+endfunction()
+
+# By default have PROTOBUF_GENERATE_C macro pass -I to protoc
+# for each directory where a proto file is referenced.
+if (NOT DEFINED PROTOBUF_GENERATE_C_APPEND_PATH)
+  set(PROTOBUF_GENERATE_C_APPEND_PATH TRUE)
+endif ()
+
+# Find library
+find_library(PROTOBUF_C_LIBRARY
+  NAMES libprotobuf-c.so libprotobuf-c libprotobuf-c.dylib
+  )
+mark_as_advanced(PROTOBUF_C_LIBRARY)
+
+# Find the include directory
+find_path(PROTOBUF_C_INCLUDE_DIR
+  google/protobuf-c/protobuf-c.h
+  )
+mark_as_advanced(PROTOBUF_C_INCLUDE_DIR)
+
+# Find the protoc-c Executable
+find_program(PROTOBUF_PROTOC_C_EXECUTABLE
+  NAMES protoc protoc-c
+  DOC "The Google Protocol Buffers C Compiler"
+  )
+mark_as_advanced(PROTOBUF_PROTOC_C_EXECUTABLE)
+
+find_package(PackageHandleStandardArgs)
+find_package_handle_standard_args(ProtobufC DEFAULT_MSG
+  PROTOBUF_C_LIBRARY PROTOBUF_C_INCLUDE_DIR PROTOBUF_PROTOC_C_EXECUTABLE)
+
+set(PROTOBUF_C_INCLUDE_DIRS ${PROTOBUF_C_INCLUDE_DIR})