Added submodule contents into tree

externals/mbedtls/3rdparty/p256-m/CMakeLists.txt

@@ -0,0 +1,40 @@
+set(p256m_target ${MBEDTLS_TARGET_PREFIX}p256m)
+
+add_library(${p256m_target}
+    p256-m_driver_entrypoints.c
+    p256-m/p256-m.c)
+
+target_include_directories(${p256m_target}
+  PUBLIC $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>
+         $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/p256-m>
+         $<BUILD_INTERFACE:${MBEDTLS_DIR}/include>
+         $<INSTALL_INTERFACE:include>
+  PRIVATE ${MBEDTLS_DIR}/library/)
+
+# Pass-through MBEDTLS_CONFIG_FILE and MBEDTLS_USER_CONFIG_FILE
+# This must be duplicated from library/CMakeLists.txt because
+# p256m is not directly linked against any mbedtls targets
+# so does not inherit the compile definitions.
+if(MBEDTLS_CONFIG_FILE)
+    target_compile_definitions(${p256m_target}
+        PUBLIC MBEDTLS_CONFIG_FILE="${MBEDTLS_CONFIG_FILE}")
+endif()
+if(MBEDTLS_USER_CONFIG_FILE)
+    target_compile_definitions(${p256m_target}
+        PUBLIC MBEDTLS_USER_CONFIG_FILE="${MBEDTLS_USER_CONFIG_FILE}")
+endif()
+
+if(INSTALL_MBEDTLS_HEADERS)
+
+  install(DIRECTORY :${CMAKE_CURRENT_SOURCE_DIR}
+    DESTINATION include
+    FILE_PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
+    DIRECTORY_PERMISSIONS OWNER_READ OWNER_WRITE OWNER_EXECUTE GROUP_READ GROUP_EXECUTE WORLD_READ WORLD_EXECUTE
+    FILES_MATCHING PATTERN "*.h")
+
+endif(INSTALL_MBEDTLS_HEADERS)
+
+install(TARGETS ${p256m_target}
+EXPORT MbedTLSTargets
+DESTINATION ${CMAKE_INSTALL_LIBDIR}
+PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ)