Limit set of symbols exported from libdlt

Summary:

This commit deals with issues potentially introduced in code
linked to shared libdlt. The library previously exported all
symbols by default, up to ~60 of which were not prefixed 'dlt*'
and could conflict with symbols in the consumer code.

After applying this commit only symbols prefixed 'dlt*'
can be observed using

$ nm --dynamic --defined-only ./build/src/lib/libdlt.so | cut -f3 -d' ' | sort

which drastically reduces the chance of such conflicts.

Brief:

- explicit symbol export using DLT_EXPORT macro as provided by
  CMake's GenerateExportHeader module
- rename get_filename_ext to dlt_get_filename_ext
- rename getFileSerialNumber to dlt_get_file_serial_number
- hide dlt_daemon's original main() in unit tests to avoid
  multiple definition on some platforms
- add CMake 3.12's GenerateExportHeader to repository for
  backward-compatibility with pre-3.12 CMake (i.e. Ubuntu 18.04)

cmake/compat/exportheader.cmake.in

@@ -0,0 +1,42 @@
+
+#ifndef @INCLUDE_GUARD_NAME@
+#define @INCLUDE_GUARD_NAME@
+
+#ifdef @STATIC_DEFINE@
+#  define @EXPORT_MACRO_NAME@
+#  define @NO_EXPORT_MACRO_NAME@
+#else
+#  ifndef @EXPORT_MACRO_NAME@
+#    ifdef @EXPORT_IMPORT_CONDITION@
+        /* We are building this library */
+#      define @EXPORT_MACRO_NAME@ @DEFINE_EXPORT@
+#    else
+        /* We are using this library */
+#      define @EXPORT_MACRO_NAME@ @DEFINE_IMPORT@
+#    endif
+#  endif
+
+#  ifndef @NO_EXPORT_MACRO_NAME@
+#    define @NO_EXPORT_MACRO_NAME@ @DEFINE_NO_EXPORT@
+#  endif
+#endif
+
+#ifndef @DEPRECATED_MACRO_NAME@
+#  define @DEPRECATED_MACRO_NAME@ @DEFINE_DEPRECATED@
+#endif
+
+#ifndef @DEPRECATED_MACRO_NAME@_EXPORT
+#  define @DEPRECATED_MACRO_NAME@_EXPORT @EXPORT_MACRO_NAME@ @DEPRECATED_MACRO_NAME@
+#endif
+
+#ifndef @DEPRECATED_MACRO_NAME@_NO_EXPORT
+#  define @DEPRECATED_MACRO_NAME@_NO_EXPORT @NO_EXPORT_MACRO_NAME@ @DEPRECATED_MACRO_NAME@
+#endif
+
+#if @DEFINE_NO_DEPRECATED@ /* DEFINE_NO_DEPRECATED */
+#  ifndef @NO_DEPRECATED_MACRO_NAME@
+#    define @NO_DEPRECATED_MACRO_NAME@
+#  endif
+#endif
+@CUSTOM_CONTENT@
+#endif /* @INCLUDE_GUARD_NAME@ */

include/dlt/CMakeLists.txt

@@ -19,11 +19,21 @@ endif()
 
 configure_file(dlt_user.h.in dlt_user.h)
 
+if(CMAKE_VERSION VERSION_LESS "3.12")
+    list(APPEND CMAKE_MODULE_PATH "${CMAKE_SOURCE_DIR}/cmake/compat")
+    include(DltGenerateExportHeader) # compatibilty for pre-3.12 CMake
+else()
+    include(GenerateExportHeader)
+endif()
+
+generate_export_header(dlt)
+
 set(HEADER_LIST dlt.h dlt_user_macros.h dlt_client.h dlt_protocol.h
                 dlt_common.h dlt_types.h dlt_shm.h dlt_offline_trace.h
                 dlt_filetransfer.h dlt_common_api.h dlt_multiple_files.h
                 ${CMAKE_CURRENT_BINARY_DIR}/dlt_version.h
-                ${CMAKE_CURRENT_BINARY_DIR}/dlt_user.h)
+                ${CMAKE_CURRENT_BINARY_DIR}/dlt_user.h
+                ${CMAKE_CURRENT_BINARY_DIR}/dlt_export.h)
 
 if(WITH_DLT_DISABLE_MACRO)
     list(REMOVE_ITEM HEADER_LIST dlt_user_macros.h)

include/dlt/dlt_client.h

@@ -73,6 +73,7 @@
  \{
  */
 
+#   include "dlt_export.h"
 #   include "dlt_types.h"
 #   include "dlt_common.h"
 #include <stdbool.h>
@@ -106,8 +107,8 @@ typedef struct
 extern "C" {
 #   endif
 
-void dlt_client_register_message_callback(int (*registerd_callback)(DltMessage *message, void *data));
-void dlt_client_register_fetch_next_message_callback(bool (*registerd_callback)(void *data));
+DLT_EXPORT void dlt_client_register_message_callback(int (*registerd_callback)(DltMessage *message, void *data));
+DLT_EXPORT void dlt_client_register_fetch_next_message_callback(bool (*registerd_callback)(void *data));
 
 /**
  * Initialising dlt client structure with a specific port
@@ -116,45 +117,45 @@ void dlt_client_register_fetch_next_message_callback(bool (*registerd_callback)(
  * @param verbose if set to true verbose information is printed out.
  * @return negative value if there was an error
  */
-int dlt_client_init_port(DltClient *client, int port, int verbose);
+DLT_EXPORT int dlt_client_init_port(DltClient *client, int port, int verbose);
 
 /**
  * Initialising dlt client structure
  * @param client pointer to dlt client structure
  * @param verbose if set to true verbose information is printed out.
  * @return Value from DltReturnValue enum
  */
-DltReturnValue dlt_client_init(DltClient *client, int verbose);
+DLT_EXPORT DltReturnValue dlt_client_init(DltClient *client, int verbose);
 /**
  * Connect to dlt daemon using the information from the dlt client structure
  * @param client pointer to dlt client structure
  * @param verbose if set to true verbose information is printed out.
  * @return Value from DltReturnValue enum
  */
-DltReturnValue dlt_client_connect(DltClient *client, int verbose);
+DLT_EXPORT DltReturnValue dlt_client_connect(DltClient *client, int verbose);
 /**
  * Cleanup dlt client structure
  * @param client pointer to dlt client structure
  * @param verbose if set to true verbose information is printed out.
  * @return Value from DltReturnValue enum
  */
-DltReturnValue dlt_client_cleanup(DltClient *client, int verbose);
+DLT_EXPORT DltReturnValue dlt_client_cleanup(DltClient *client, int verbose);
 /**
  * Main Loop of dlt client application
  * @param client pointer to dlt client structure
  * @param data pointer to data to be provided to the main loop
  * @param verbose if set to true verbose information is printed out.
  * @return Value from DltReturnValue enum
  */
-DltReturnValue dlt_client_main_loop(DltClient *client, void *data, int verbose);
+DLT_EXPORT DltReturnValue dlt_client_main_loop(DltClient *client, void *data, int verbose);
 
 /**
  * Send a message to the daemon through the socket.
  * @param client pointer to dlt client structure.
  * @param msg The message to be send in DLT format.
  * @return Value from DltReturnValue enum.
  */
-DltReturnValue dlt_client_send_message_to_socket(DltClient *client, DltMessage *msg);
+DLT_EXPORT DltReturnValue dlt_client_send_message_to_socket(DltClient *client, DltMessage *msg);
 
 /**
  * Send ancontrol message to the dlt daemon
@@ -165,7 +166,7 @@ DltReturnValue dlt_client_send_message_to_socket(DltClient *client, DltMessage *
  * @param size Size of control message data
  * @return Value from DltReturnValue enum
  */
-DltReturnValue dlt_client_send_ctrl_msg(DltClient *client, char *apid, char *ctid, uint8_t *payload, uint32_t size);
+DLT_EXPORT DltReturnValue dlt_client_send_ctrl_msg(DltClient *client, char *apid, char *ctid, uint8_t *payload, uint32_t size);
 /**
  * Send an injection message to the dlt daemon
  * @param client pointer to dlt client structure
@@ -176,7 +177,7 @@ DltReturnValue dlt_client_send_ctrl_msg(DltClient *client, char *apid, char *cti
  * @param size Size of injection data within buffer
  * @return Value from DltReturnValue enum
  */
-DltReturnValue dlt_client_send_inject_msg(DltClient *client,
+DLT_EXPORT DltReturnValue dlt_client_send_inject_msg(DltClient *client,
                                           char *apid,
                                           char *ctid,
                                           uint32_t serviceID,
@@ -190,35 +191,35 @@ DltReturnValue dlt_client_send_inject_msg(DltClient *client,
  * @param logLevel Log Level
  * @return Value from DltReturnValue enum
  */
-DltReturnValue dlt_client_send_log_level(DltClient *client, char *apid, char *ctid, uint8_t logLevel);
+DLT_EXPORT DltReturnValue dlt_client_send_log_level(DltClient *client, char *apid, char *ctid, uint8_t logLevel);
 /**
  * Send an request to get log info message to the dlt daemon
  * @param client pointer to dlt client structure
  * @return negative value if there was an error
  */
-int dlt_client_get_log_info(DltClient *client);
+DLT_EXPORT int dlt_client_get_log_info(DltClient *client);
 /**
  * Send an request to get default log level to the dlt daemon
  * @param client pointer to dlt client structure
  * @return negative value if there was an error
  */
-DltReturnValue dlt_client_get_default_log_level(DltClient *client);
+DLT_EXPORT DltReturnValue dlt_client_get_default_log_level(DltClient *client);
 /**
  * Send an request to get software version to the dlt daemon
  * @param client pointer to dlt client structure
  * @return negative value if there was an error
  */
-int dlt_client_get_software_version(DltClient *client);
+DLT_EXPORT int dlt_client_get_software_version(DltClient *client);
 /**
  * Initialise get log info structure
  * @return void
  */
-void dlt_getloginfo_init(void);
+DLT_EXPORT void dlt_getloginfo_init(void);
 /**
  * To free the memory allocated for app description in get log info
  * @return void
  */
-void dlt_getloginfo_free(void);
+DLT_EXPORT void dlt_getloginfo_free(void);
 /**
  * Send a set trace status message to the dlt daemon
  * @param client pointer to dlt client structure
@@ -227,118 +228,118 @@ void dlt_getloginfo_free(void);
  * @param traceStatus Default Trace Status
  * @return Value from DltReturnValue enum
  */
-DltReturnValue dlt_client_send_trace_status(DltClient *client, char *apid, char *ctid, uint8_t traceStatus);
+DLT_EXPORT DltReturnValue dlt_client_send_trace_status(DltClient *client, char *apid, char *ctid, uint8_t traceStatus);
 /**
  * Send the default log level to the dlt daemon
  * @param client pointer to dlt client structure
  * @param defaultLogLevel Default Log Level
  * @return Value from DltReturnValue enum
  */
-DltReturnValue dlt_client_send_default_log_level(DltClient *client, uint8_t defaultLogLevel);
+DLT_EXPORT DltReturnValue dlt_client_send_default_log_level(DltClient *client, uint8_t defaultLogLevel);
 /**
  * Send the log level to all contexts registered with dlt daemon
  * @param client pointer to dlt client structure
  * @param LogLevel Log Level to be set
  * @return Value from DltReturnValue enum
  */
-DltReturnValue dlt_client_send_all_log_level(DltClient *client, uint8_t LogLevel);
+DLT_EXPORT DltReturnValue dlt_client_send_all_log_level(DltClient *client, uint8_t LogLevel);
 /**
  * Send the default trace status to the dlt daemon
  * @param client pointer to dlt client structure
  * @param defaultTraceStatus Default Trace Status
  * @return Value from DltReturnValue enum
  */
-DltReturnValue dlt_client_send_default_trace_status(DltClient *client, uint8_t defaultTraceStatus);
+DLT_EXPORT DltReturnValue dlt_client_send_default_trace_status(DltClient *client, uint8_t defaultTraceStatus);
 /**
  * Send the trace status to all contexts registered with dlt daemon
  * @param client pointer to dlt client structure
  * @param traceStatus trace status to be set
  * @return Value from DltReturnValue enum
  */
-DltReturnValue dlt_client_send_all_trace_status(DltClient *client, uint8_t traceStatus);
+DLT_EXPORT DltReturnValue dlt_client_send_all_trace_status(DltClient *client, uint8_t traceStatus);
 /**
  * Send the timing pakets status to the dlt daemon
  * @param client pointer to dlt client structure
  * @param timingPakets Timing pakets enabled
  * @return Value from DltReturnValue enum
  */
-DltReturnValue dlt_client_send_timing_pakets(DltClient *client, uint8_t timingPakets);
+DLT_EXPORT DltReturnValue dlt_client_send_timing_pakets(DltClient *client, uint8_t timingPakets);
 /**
  * Send the store config command to the dlt daemon
  * @param client pointer to dlt client structure
  * @return Value from DltReturnValue enum
  */
-DltReturnValue dlt_client_send_store_config(DltClient *client);
+DLT_EXPORT DltReturnValue dlt_client_send_store_config(DltClient *client);
 /**
  * Send the reset to factory default command to the dlt daemon
  * @param client pointer to dlt client structure
  * @return Value from DltReturnValue enum
  */
-DltReturnValue dlt_client_send_reset_to_factory_default(DltClient *client);
+DLT_EXPORT DltReturnValue dlt_client_send_reset_to_factory_default(DltClient *client);
 
 /**
  * Set baudrate within dlt client structure
  * @param client pointer to dlt client structure
  * @param baudrate Baudrate
  * @return Value from DltReturnValue enum
  */
-DltReturnValue dlt_client_setbaudrate(DltClient *client, int baudrate);
+DLT_EXPORT DltReturnValue dlt_client_setbaudrate(DltClient *client, int baudrate);
 
 /**
  * Set mode within dlt client structure
  * @param client pointer to dlt client structure
  * @param mode DltClientMode
  * @return Value from DltReturnValue enum
  */
-DltReturnValue dlt_client_set_mode(DltClient *client, DltClientMode mode);
+DLT_EXPORT DltReturnValue dlt_client_set_mode(DltClient *client, DltClientMode mode);
 
 /**
  * Set server ip
  * @param client pointer to dlt client structure
  * @param ipaddr pointer to command line argument
  * @return negative value if there was an error
  */
-int dlt_client_set_server_ip(DltClient *client, char *ipaddr);
+DLT_EXPORT int dlt_client_set_server_ip(DltClient *client, char *ipaddr);
 
 /**
  * Set server UDP host receiver interface address
  * @param client pointer to dlt client structure
  * @param hostip pointer to multicast group address
  * @return negative value if there was an error
  */
-int dlt_client_set_host_if_address(DltClient *client, char *hostip);
+DLT_EXPORT int dlt_client_set_host_if_address(DltClient *client, char *hostip);
 
 /**
  * Set serial device
  * @param client pointer to dlt client structure
  * @param serial_device pointer to command line argument
  * @return negative value if there was an error
  */
-int dlt_client_set_serial_device(DltClient *client, char *serial_device);
+DLT_EXPORT int dlt_client_set_serial_device(DltClient *client, char *serial_device);
 
 /**
  * Set socket path
  * @param client pointer to dlt client structure
  * @param socket_path pointer to socket path string
  * @return negative value if there was an error
  */
-int dlt_client_set_socket_path(DltClient *client, char *socket_path);
+DLT_EXPORT int dlt_client_set_socket_path(DltClient *client, char *socket_path);
 
 /**
  * Parse GET_LOG_INFO response text
  * @param resp      GET_LOG_INFO response
  * @param resp_text response text represented by ASCII
  * @return Value from DltReturnValue enum
  */
-DltReturnValue dlt_client_parse_get_log_info_resp_text(DltServiceGetLogInfoResponse *resp,
+DLT_EXPORT DltReturnValue dlt_client_parse_get_log_info_resp_text(DltServiceGetLogInfoResponse *resp,
                                                        char *resp_text);
 
 /**
  * Free memory allocated for get log info message
  * @param resp response
  * @return 0 on success, -1 otherwise
  */
-int dlt_client_cleanup_get_log_info(DltServiceGetLogInfoResponse *resp);
+DLT_EXPORT int dlt_client_cleanup_get_log_info(DltServiceGetLogInfoResponse *resp);
 #   ifdef __cplusplus
 }
 #   endif