Re: "rpl_fprintf" not found if compiled with options "-ggdb -Og"

[Paul Eggert]

On 7/31/21 6:33 PM, Bjarni Ingi Gislason wrote:
>                   from ../src/devices/xditview/page.c:7:
> ./lib/unistd.h:663:3: error: #error "Please include config.h first."
>    663 |  #error "Please include config.h first."
>        |   ^~~~~

That's a problem. page.c should include config.h first. This is required 
of all Autoconf-using code.

>   In my branch I have added the missing '#include "config.h"' in
> ../src/devices/xditview/page.c
> and other missing "config.h" lines in other source files.

That sounds like the right thing to do, yes.

> CPPFLAGS=-D_FORTIFY_SOURCE=2
>
>   Changing the value from 2 to 0 or 1, eliminates the error.

I suggest configuring with the same flags that you build with, and if 
the flags seriously alter the API or ABI then putting them into CC. 
Something like this, perhaps.

  ./configure CC='gcc -D_FORTIFY_SOURCE=2'

This sort of thing can be needed if the -D option changes the API or 
ABI. The idea is that you want to configure with the same flags that you 
build with.