[Buildroot] pppd - fails to build on current git.

[Thomas Petazzoni]

Hello,

On Thu, 11 Oct 2018 12:25:17 +0000, Vellemans, Noel wrote:

> pppd fails to build on current git-snapshot.

Indeed:

  http://autobuild.buildroot.net/?reason=pppd%

> pppcrypt.c: In function 'DesSetkey':
> pppcrypt.c:122:2: warning: implicit declaration of function 'setkey'; did you mean 'DesSetkey'? [-Wimplicit-function-declaration]
>   setkey((const char *)crypt_key);
>   ^~~~~~
>   DesSetkey
> pppcrypt.c: In function 'DesEncrypt':
> pppcrypt.c:137:2: warning: implicit declaration of function 'encrypt'; did you mean 'crypt'? [-Wimplicit-function-declaration]
>   encrypt((char *)des_input, 0);
>   ^~~~~~~
>   crypt
> ...
> pppcrypt.o: In function `DesSetkey':
> pppcrypt.c:(.text+0x140): undefined reference to `setkey'
> pppcrypt.o: In function `DesEncrypt':
> pppcrypt.c:(.text+0x184): undefined reference to `encrypt'
> pppcrypt.o: In function `DesDecrypt':
> pppcrypt.c:(.text+0x1dc): undefined reference to `encrypt'
> collect2: error: ld returned 1 exit status
> Makefile:217: recipe for target 'pppd' failed
> make[3]: *** [pppd] Error 1
> Makefile:13: recipe for target 'all' failed
> 
> ==============================================================
> 
> 
> Probably based on ongoing work as stated here : https://sourceware.org/ml/libc-alpha/2017-08/msg01257.html
> "The function prototypes for crypt and encrypt are removed from unistd.h, and the function prototype for setkey is removed from
> stdlib.h"

glibc 2.28 removed libcrypt, and there are patches floating around that
make pppd use openssl instead:

  https://github.com/paulusmack/ppp/issues/93

Perhaps you could re-use this to fix the issue ?

Thanks,

Thomas Petazzoni
-- 
Thomas Petazzoni, CTO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com