build: Revise the build system

This revises the build system to have configuration per system
component. System settings can now be set using cmake.

The standard compliance defines were removed from configuration header
and are set in the sources where needed. Also some small code
refactors, such as moving the data for shims out of the ipcp structure
to the respective shims were performed.

1 files changed, 46 insertions, 16 deletions

diff --git a/src/ipcpd/shim-eth-llc/CMakeLists.txt b/src/ipcpd/shim-eth-llc/CMakeLists.txt
index 21003cf0..6474eb8d 100644
--- a/src/ipcpd/shim-eth-llc/CMakeLists.txt
+++ b/src/ipcpd/shim-eth-llc/CMakeLists.txt
@@ -15,26 +15,56 @@ include_directories(${CMAKE_BINARY_DIR}/include)
 find_path(NETMAP_C_INCLUDE_DIR
   net/netmap_user.h
   HINTS /usr/include /usr/local/include
-  )
+)
+
+mark_as_advanced(NETMAP_C_INCLUDE_DIR)
+
+if (CMAKE_SYSTEM_NAME STREQUAL "Linux")
+  set(DISABLE_RAW_SOCKETS FALSE CACHE BOOL
+    "Disable raw socket support for LLC shim")
+  if (NOT DISABLE_RAW_SOCKETS)
+    message(STATUS "Raw socket support for shim-eth-llc enabled")
+    set(HAVE_RAW_SOCKETS TRUE PARENT_SCOPE)
+  else ()
+    message(STATUS "Raw socket support for shim-eth-llc disabled by user")
+  endif ()
+endif ()
 
-find_path(BPF_C_INCLUDE_DIR
-  net/bpf.h
-  HINTS /usr/include /usr/local/include
+if (NOT CMAKE_SYSTEM_NAME STREQUAL "Linux")
+  find_path(BPF_C_INCLUDE_DIR
+            net/bpf.h
+            HINTS /usr/include /usr/local/include
   )
 
-if (NOT CMAKE_SYSTEM_NAME STREQUAL "Linux" AND
-    NOT BPF_C_INCLUDE_DIR STREQUAL "BPF_C_INCLUDE_DIR-NOTFOUND")
-  message(STATUS "Found Berkeley Packet Filter headers in ${BPF_C_INCLUDE_DIR}")
-  set(HAVE_BPF "1" CACHE STRING "Have Berkeley Packet Filter")
+  mark_as_advanced(BPF_C_INCLUDE_DIR)
+
+  if (BPF_C_INCLUDE_DIR)
+    set(DISABLE_BPF FALSE CACHE BOOL
+        "Disable Berkeley Packet Filter support for LLC shim")
+    if (NOT DISABLE_BPF)
+      message(STATUS "Berkeley Packet Filter support "
+                     "for shim-eth-llc enabled")
+      set(HAVE_BPF TRUE PARENT_SCOPE)
+    else ()
+      message(STATUS "Berkeley Packet Filter support "
+                     "for shim-eth-llc disabled by user")
+    endif ()
+  endif ()
 endif ()
 
-if (NOT NETMAP_C_INCLUDE_DIR STREQUAL "NETMAP_C_INCLUDE_DIR-NOTFOUND")
-  message(STATUS "Found netmap headers in ${NETMAP_C_INCLUDE_DIR}")
-  set(HAVE_NETMAP "1" CACHE STRING "Have netmap")
-  test_and_set_c_compiler_flag_global(-std=c99)
+if (NETMAP_C_INCLUDE_DIR)
+  set(DISABLE_NETMAP FALSE CACHE BOOL
+      "Disable netmap support for LLC shim")
+  if (NOT DISABLE_NETMAP)
+    message(STATUS "Netmap support for shim-eth-llc enabled")
+    set(HAVE_NETMAP TRUE PARENT_SCOPE)
+    test_and_set_c_compiler_flag_global(-std=c99)
+  else ()
+    message(STATUS "Netmap support for shim-eth-llc disabled by user")
+  endif ()
 endif ()
 
-if (HAVE_NETMAP OR HAVE_BPF OR CMAKE_SYSTEM_NAME STREQUAL "Linux")
+if (HAVE_NETMAP OR HAVE_BPF OR HAVE_RAW_SOCKETS)
   message(STATUS "Supported raw Ethernet API found, building shim-eth-llc")
   protobuf_generate_c(SHIM_ETH_LLC_PROTO_SRCS SHIM_ETH_LLC_PROTO_HDRS
     shim_eth_llc_messages.proto)
@@ -44,8 +74,7 @@ if (HAVE_NETMAP OR HAVE_BPF OR CMAKE_SYSTEM_NAME STREQUAL "Linux")
     ${CMAKE_CURRENT_SOURCE_DIR}/main.c
   )
 
-  set(IPCP_SHIM_ETH_LLC_TARGET ipcpd-shim-eth-llc
-      CACHE STRING "IPCP_SHIM_ETH_LLC_TARGET")
+  set(IPCP_SHIM_ETH_LLC_TARGET ipcpd-shim-eth-llc CACHE INTERNAL "")
 
   add_executable(ipcpd-shim-eth-llc ${SHIM_ETH_LLC_SOURCES} ${IPCP_SOURCES}
     ${SHIM_ETH_LLC_PROTO_SRCS})
@@ -55,7 +84,8 @@ if (HAVE_NETMAP OR HAVE_BPF OR CMAKE_SYSTEM_NAME STREQUAL "Linux")
   endif ()
 
   if (HAVE_NETMAP AND NOT APPLE)
-    target_include_directories(ipcpd-shim-eth-llc PUBLIC ${NETMAP_C_INCLUDE_DIR})
+    target_include_directories(ipcpd-shim-eth-llc PUBLIC
+      ${NETMAP_C_INCLUDE_DIR})
   endif ()
 
   target_link_libraries(ipcpd-shim-eth-llc LINK_PUBLIC ouroboros