linker - How to fail the build based on the conditional values of linker variables defined in linker script?

Question

How to fail the build based on the conditional values of linker variables defined in linker script?

I am compiling C code using GCC. I defined a linker variable BINARY_TEST. If Value of BINARY_TEST > 32KB, then i want to Fail the build. How to write a conditional test and fail the build using linker script? Please suggest any script.

SECTIONS
{
  . = 0x0000 ;

  .text : 
  { 
    *(.text)
    *(.rdata)                             

  }

  .data :
  {
    *(*.data)
    *(*.bss)       
  }

  BINARY_TEST = . ;

  /*Want something like below */   
  if (BINARY_TEST > 32KB) 
     Throw Error and stop
  /* ******* */ 

  END = . ;
}

Answer 1

如何编写条件测试并使用链接器脚本使构建失败？

在我看来，您可以将失败简单地实现为链接后步骤。例如在你的Makefile：

foo.exe: foo.o
    $(CC) -o foo.exe ...
    nm foo.exe | grep BINARY_TEST | \
    ... commands to verify that symbol value < 32K, or fail

Answer 2

这是执行此操作的一种方法：

CHECK_BOOTLOADER_SIZE = 1 / (. <= 32768);

如果当前位置超出限制，这将给出错误消息：

linker.ld:33 / by zero

不是最清晰的错误消息，但至少它包含行号，以便用户可以阅读评论。