Re: [libmicrohttpd] an optimalisation hint - less SRAM memory

[Christian Grothoff]

Absolutely right.  Changed as suggested in SVN 25941.

Happy hacking!

-Christian

On 01/30/2013 12:11 PM, Martin Velek wrote:
> Hello,
>
> could be possible to change declarations for arrays of strings in the
> file reason_phrase.c?
>
> Currently it is static const char * []. This places all strings into
> .rodata section and pointers to them into LMA of .text and also into
> .data in VMA.
>
> E.g. for an ARM Cortex M3 (flash + SRAM) compiled with a arm-none-eabi-gcc
> static const char *one_hundred[] = {
> "Continue",
> "Switching Protocols",
> "Processing"
> };
>
>
> Strings "Continue", "Switching Protocols", "Processing" are stored in
> flash. Also an array with pointers to strings is stored in flash. In
> addition, this array is copied into SRAM (+16 bytes). If you would
> change it to "static const char * const one_hundred[]" ... it would
> occupy only flash.
>
> and
> struct MHD_Reason_Block
> {
> ......
>    const char * const * data;
> };
>
> I agree, it is not relevant on a PC but on most microcontroller the SRAM
> is a limiting factor not the rom(flash).
>
> Best
> Martin Velek