arch/crt0.c: revert entry to _start

This reverts name changes in pull/12201 to fix LTO issue/17443,
needs apps/ side patch.

Signed-off-by: Yanfeng Liu <[email protected]>

Author: yf13

arch/arm/src/common/crt0.c

@@ -141,7 +141,7 @@ static void exec_dtors(void)
  ****************************************************************************/
 
 /****************************************************************************
- * Name: __start
+ * Name: _start
  *
  * Description:
  *   This function is the low level entry point into the main thread of
@@ -160,7 +160,7 @@ static void exec_dtors(void)
  *
  ****************************************************************************/
 
-void __start(int argc, char *argv[])
+void _start(int argc, char *argv[])
 {
   int ret;
 

arch/arm64/src/common/crt0.c

@@ -148,7 +148,7 @@ static void exec_dtors(void)
  ****************************************************************************/
 
 /****************************************************************************
- * Name: __start
+ * Name: _start
  *
  * Description:
  *   This function is the low level entry point into the main thread of
@@ -167,7 +167,7 @@ static void exec_dtors(void)
  *
  ****************************************************************************/
 
-void __start(int argc, char *argv[])
+void _start(int argc, char *argv[])
 {
   int ret;
 

arch/risc-v/src/common/crt0.c

@@ -145,7 +145,7 @@ static void exec_dtors(void)
  ****************************************************************************/
 
 /****************************************************************************
- * Name: __start
+ * Name: _start
  *
  * Description:
  *   This function is the low level entry point into the main thread of
@@ -164,7 +164,7 @@ static void exec_dtors(void)
  *
  ****************************************************************************/
 
-void __start(int argc, char *argv[])
+void _start(int argc, char *argv[])
 {
   int ret;
 

arch/x86_64/src/common/crt0.c

@@ -130,7 +130,7 @@ static void exec_dtors(void)
  ****************************************************************************/
 
 /****************************************************************************
- * Name: __start
+ * Name: _start
  *
  * Description:
  *   This function is the low level entry point into the main thread of
@@ -149,7 +149,7 @@ static void exec_dtors(void)
  *
  ****************************************************************************/
 
-void __start(int argc, char *argv[])
+void _start(int argc, char *argv[])
 {
   int ret;
 

arch/xtensa/src/common/crt0.c

@@ -96,7 +96,7 @@ static void exec_dtors(void)
  ****************************************************************************/
 
 /****************************************************************************
- * Name: __start
+ * Name: _start
  *
  * Description:
  *   This function is the low level entry point into the main thread of
@@ -115,7 +115,7 @@ static void exec_dtors(void)
  *
  ****************************************************************************/
 
-void __start(int argc, char *argv[])
+void _start(int argc, char *argv[])
 {
   int ret;
 

tools/toolchain.cmake.export

@@ -22,8 +22,9 @@ set(CMAKE_CXX_STANDARD_INCLUDE_DIRECTORIES
 add_compile_options(-nostdlib)
 add_compile_options(-ffunction-sections -fdata-sections)
 
-# same entry used for all build modes in crt0.c and arch/.../xxx_start.c
-set(ENTRY_NAME "__start")
+# same entry used for all build modes in crt0.c
+
+set(ENTRY_NAME "_start")
 
 set(CMAKE_C_LINK_EXECUTABLE
     "<CMAKE_LINKER> ${LDFLAGS} --entry=${ENTRY_NAME} -T${LINKER_SCRIPT} <OBJECTS> -o <TARGET> <LINK_LIBRARIES> -L${NUTTX_PATH}/libs --start-group ${LDLIBS} ${EXTRA_LIBS} --end-group"