cmake: Add option to align ZMQ quirk with CSPv1

Introduce a new CMake option `CSP_FIXUP_V1_ZMQ_LITTLE_ENDIAN`. When
enabled, this option applies a fixup to the ZMQ interface to match the
libcsp v1 behavior, which incorrectly used host endianness instead of
the expected big-endian format.

This fixup ensures compatibility with systems using libcsp v1 while
aligning with the behavior of libcsp v2.

Signed-off-by: Yasushi SHOJI <[email protected]>

Author: yashi

CMakeLists.txt

@@ -39,6 +39,8 @@ option(CSP_BUFFER_ZERO_CLEAR "Zero out the packet buffer upon allocation" ON)
 option(CSP_ENABLE_PYTHON3_BINDINGS "Build Python3 binding" OFF)
 option(CSP_BUILD_SAMPLES "Build samples and examples by default" OFF)
 
+option(CSP_FIXUP_V1_ZMQ_LITTLE_ENDIAN "Use little-endian CSP ID for ZMQ with CSPv1" ON)
+
 if(CMAKE_SYSTEM_NAME STREQUAL "Linux")
   set(CSP_POSIX 1)
 elseif(CMAKE_SYSTEM_NAME STREQUAL "Generic")

csp_autoconfig.h.in

@@ -25,3 +25,5 @@
 
 #cmakedefine01 CSP_HAVE_LIBSOCKETCAN
 #cmakedefine01 CSP_HAVE_LIBZMQ
+
+#cmakedefine01 CSP_FIXUP_V1_ZMQ_LITTLE_ENDIAN