Re: [lwip-users] Can't build "Working example" from BUILDING

[Grant Edwards]

On 2021-09-30, Grant Edwards <grant.b.edwards@gmail.com> wrote:

> What apprently needs to be done is:
>
>  1. Move 'contrib' directory up one level.
>
>  2. The shell commands shown in section "Working example" should not
>     be done in the lwip root directory as stated. They are done in
>
>         contib/ports/unix/example_app
>
> That appears to attemp to compile source files. But, that fails also:
>
>     $ cmake --build .
>     [  1%] Building C object 
> CMakeFiles/makefsdata.dir/home/grante/lwip/lwip/src/apps/http/makefsdata/makefsdata.c.o
>     /home/grante/lwip/lwip/src/apps/http/makefsdata/makefsdata.c: In function 
> ‘process_file’:
>     /home/grante/lwip/lwip/src/apps/http/makefsdata/makefsdata.c:923:32: 
> error: ‘sprintf’ may write a terminating nul past the end of the destination 
> [-Werror=format-overflow=]
>       923 |   sprintf(qualifiedName, "%s/%s", curSubdir, filename);
>           |                                ^
>     /home/grante/lwip/lwip/src/apps/http/makefsdata/makefsdata.c:923:3: note: 
> ‘sprintf’ output 2 or more bytes (assuming 257) into a destination of size 256
>       923 |   sprintf(qualifiedName, "%s/%s", curSubdir, filename);
>           |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>     cc1: all warnings being treated as errors
>     gmake[2]: *** [CMakeFiles/makefsdata.dir/build.make:76: 
> CMakeFiles/makefsdata.dir/home/grante/lwip/lwip/src/apps/http/makefsdata/makefsdata.c.o]
>  Error 1
>     gmake[1]: *** [CMakeFiles/Makefile2:91: CMakeFiles/makefsdata.dir/all] 
> Error 2

The build steps I'm using must still be wrong, because I can't
believe that release candidate sources won't even compile. But, in a
attempt to make some progress, I changed 
lwip/src/apps/http/makefsdata/makefsdata.c
to fix the buffer overflow, and the "Working example" build still fails:

    [ 99%] Built target lwipallapps
    [ 99%] Building C object 
CMakeFiles/example_app.dir/home/grante/lwip/contrib/examples/example_app/test.c.o
    /home/grante/lwip/contrib/examples/example_app/test.c:108:10: fatal error: 
lwipcfg.h: No such file or directory
      108 | #include "lwipcfg.h"
            |          ^~~~~~~~~~~
            compilation terminated.
            gmake[2]: *** [CMakeFiles/example_app.dir/build.make:76: 
CMakeFiles/example_app.dir/home/grante/lwip/contrib/examples/example_app/test.c.o]
 Error 1
            gmake[1]: *** [CMakeFiles/Makefile2:122: 
CMakeFiles/example_app.dir/all] Error 2
            gmake: *** [Makefile:91: all] Error 2

So I'm obviously still doing something wrong, but what?

There must be some sort of working demo/example build documented somewhere?

--
Grant