[PATCH] D29327: [LLD][ELF] Use Synthetic Sections for Thunks (try 2)

[Rafael Avila de Espindola via llvm-commits]

Peter Smith <peter.smith at linaro.org> writes:

> It is possible, although somewhat contrived, to mix executable and
> non-executable input sections within the same output section with
> linker scripts. From what I can tell it isn't possible for linker
> generated Output Sections.
>
> For example:
> SECTIONS {
>     .text : { *(.text) *(.rodata) }
> }
> I've checked that with a simple assembler file:
> .syntax unified
>  .text
>  nop
>  .rodata
>  .word 10
>
> We get one .text OutputSection (--Map)
> 00000000 00000008     4 .text
> 00000000 00000004     4         .text
> 00000000 00000004     4                 t.o
> 00000000 00000000     0                         $a.0
> 00000004 00000004     1         .rodata
> 00000004 00000004     1                 t.o
> 00000004 00000000     0                         $d.1

But the output section is executable. So why is it important to consider
the flags of the individual input sections when placing the thunks?

Cheers,
Rafael