So I'm trying to get my FRDM-KL25Z (cortex-m0) board up and running. I've got minimal c code running and trying to do a direct conversion for a start. I'm using LDC for this project.

The linker Describes the symbol __StackTop
This is very nice and useful.

So i have this code:

extern(C) int __StackTop;

@attribute("section",".isr_vector")
shared ISR[3] g_pfnVectors  =
[
    __StackTop,
    Reset_Handler,
    ....

However I keep getting:
start.d(62): Error: static variable __StackTop cannot be read at compile time

I need the symbol to be ignored until linking. How do i do it?

On 6 Mar 2016, at 18:46, Taylor Hillegeist via digitalmars-d-ldc wrote:
> I need the symbol to be ignored until linking. How do i do it?

You probably want to declare the symbol as "extern extern(C) __gshared".

However, I'm not quite sure what your code snippet is supposed to do. What type is ISR? Are you sure you don't need to take the address of __StackTop?

 — David

On Sunday, 6 March 2016 at 18:46:35 UTC, Taylor Hillegeist wrote:
> So I'm trying to get my FRDM-KL25Z (cortex-m0) board up and running. I've got minimal c code running and trying to do a direct conversion for a start. I'm using LDC for this project.
>
> The linker Describes the symbol __StackTop
> This is very nice and useful.
>
> So i have this code:
>
> extern(C) int __StackTop;
>
> @attribute("section",".isr_vector")
> shared ISR[3] g_pfnVectors  =
> [
>     __StackTop,
>     Reset_Handler,
>     ....
>
> However I keep getting:
> start.d(62): Error: static variable __StackTop cannot be read at compile time
>
> I need the symbol to be ignored until linking. How do i do it?

Have a look at
https://bitbucket.org/timosi/minlibd/src/61039fcbbf5845c7f18370c30857cfc034241fa2/tools/main/tls.d?at=default&fileviewer=file-view-default

That is an example how I use linker variables. I use gdc but I think it is the same in ldc.
For that startup thing I have not bothered to make my own. I use the startup file from ST library instead.

On Sunday, 6 March 2016 at 18:46:35 UTC, Taylor Hillegeist wrote:
> @attribute("section",".isr_vector")

Furthermore, this should be @section(".isr_vector") (from ldc.attributes, introduced in 0.17). ldc.attribute was never implemented (nor was it documented), and has been removed in the meantime.

 — David