GCC err-「小數據段超過64KB。」「附加搬遷溢出從輸出1中省略> collect2.exe：錯誤：LD返回1個退出狀態」

Question

我使用GCC編譯器。取消-mno-gpopt標誌 後，我在編譯過程中收到以下錯誤：

c:/................../ld.exe: small-data section exceeds 64KB; 
lower small-data size limit (see option -G) 
.....................:(.text._ii_sem+0x56): relocation truncated to fit:**** 
........................ 
......................(.text._ii_+0x128): additional relocation overflows omitted from the output 
collect2.exe: error: ld returned 1 exit status 
make: *** [Makefile:76: ps100] Error 1 

（見選項-G） - MIPS documantation

This option directs the compiler to put definitions of externally-visible data in a small data section when that data is no bigger than num bytes. GCC can then use gp-relative addressing, which is a powerful tool for reducing code size and is a favorite among toolchain designers. Data that is stored within reach of the gp register can be accessed in a single instruction using a signed, 16-bit offset from the gp register ($28). Because the maximum addressing range is 64K bytes, the total size of the small data section (.sdata, .sbss , .scommon) should be less than 64K bytes.

什麼是 「小數據部」，怎麼樣我可以控制它的大小嗎？ 在小部分保存了哪些數據？ 什麼是-g默認值，即如果在Makefile中沒有提到「num」？

編輯：我曾嘗試使用「-G0」而且，我已經得到了同樣的錯誤。我檢查了.o文件並沒有找到.sbss/.sdata節。任何想法爲什麼我得到相同的錯誤？

Answer 1

您可以使用編譯器「-G0」選項。 「-G」選項設置小數據部分中變量的最大大小。在這種情況下，sbss/sdata/scommon中不會有數據。