[C++] fix the ctors initialization issue

1 files changed, 41 insertions, 1 deletions

diff --git a/components/cplusplus/README.md b/components/cplusplus/README.md
index cd133effaa..44851db56b 100644
--- a/components/cplusplus/README.md
+++ b/components/cplusplus/README.md
@@ -10,4 +10,44 @@ Because RT-Thread RTOS is used in embedded system mostly, there are some rules f
 4. Static class variables are discouraged. The time and place to call their constructor function could not be precisely controlled and make multi-threaded programming a nightmare.
 5. Multiple inheritance is strongly discouraged, as it can cause intolerable confusion.
 
-*NOTE*: For armcc compiler, the libc must be enable.
+*NOTE*: The libc must be enable.
+
+About GNU GCC compiler
+
+please add following string in your ld link script:
+// in your .text section
+        PROVIDE(__ctors_start__ = .);
+        /* old GCC version uses .ctors */
+        KEEP(*(SORT(.ctors.*)))
+        KEEP(*(.ctors))
+        /* new GCC version uses .init_array */
+        KEEP (*(SORT(.init_array.*)))
+        KEEP (*(.init_array))
+        PROVIDE(__ctors_end__ = .);
+
+        . = ALIGN(4);
+
+// as a standalone section if you use ARM target.
+
+    /* The .ARM.exidx section is used for C++ exception handling. */
+    /* .ARM.exidx is sorted, so has to go in its own output section.  */
+    __exidx_start = .;
+    .ARM.exidx :
+    {
+        *(.ARM.exidx* .gnu.linkonce.armexidx.*)
+
+        /* This is used by the startup in order to initialize the .data secion */
+        _sidata = .;
+    } > CODE
+    __exidx_end = .;
+
+    /* .data section which is used for initialized data */
+
+// in your .data section
+        PROVIDE(__dtors_start__ = .);
+        KEEP(*(SORT(.dtors.*)))
+        KEEP(*(.dtors))
+        PROVIDE(__dtors_end__ = .);
+
+        . = ALIGN(4);
+