[Buildroot] OpenSSL & Mosquitto on ARM Cortex M7

[RR <rob.r374@gmail.com>]

Hello,

I'm enclosing my defconfig... I'm basically compiling for ARM Cortex-M7
(stm32f769 discovery board).

What I have additionally spotted is that mosquiotto_sub doesn't crash with
same error, but it doesn't have ssl options working.
So probably my first problem is that libopenssl doesn't compile properly...

When I try to compile it separately, by using 
	make libopenssl-reconfigure

it seems that it doesn't have target architecture defined. If I add
BR2_PACKAGE_TARGET_ARCH="arm-v4" to make call,
I end up in error of missing file (it's also weird why win32 files are
included in compilation at all) :

/home/robi/Razvoj/Linux/Buildroot/JE_UcLinux/buildroot/../host/bin/arm-build
root-uclinux-uclibcgnueabi-gcc  -I. -Iinclude -fPIC -pthread
-Wa,--noexecstack -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
-D_FILE_OFFSET_BITS=64  -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
-D_FILE_OFFSET_BITS=64  -Os    -Wl,-elf2flt -static -DHAVE_FORK=0
-DOPENSSL_NO_MADVISE -DOPENSSL_NO_ASYNC    -Wl,-elf2flt -static
-DOPENSSL_USE_NODELETE -DOPENSSL_PIC -DOPENSSL_CPUID_OBJ
-DOPENSSL_BN_ASM_MONT -DOPENSSL_BN_ASM_GF2m -DSHA1_ASM -DSHA256_ASM
-DSHA512_ASM -DKECCAK1600_ASM -DAES_ASM -DBSAES_ASM -DGHASH_ASM
-DECP_NISTZ256_ASM -DPOLY1305_ASM -DOPENSSLDIR="\"/etc/ssl\""
-DENGINESDIR="\"/usr/lib/engines-1.1\"" -DZLIB -DNDEBUG -D_LARGEFILE_SOURCE
-D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -MMD -MF
crypto/dso/dso_win32.d.tmp -MT crypto/dso/dso_win32.o -c -o
crypto/dso/dso_win32.o crypto/dso/dso_win32.c
crypto/dso/dso_dlfcn.c:28:12: fatal error: dlfcn.h: No such file or
directory
 #  include <dlfcn.h>
            ^~~~~~~~~
compilation terminated.

Any advice where I can learn or get libopenssl compiled properly?
 Then I can proceed to mosquitto, because it uses libopenssl.
I'm probably doing something obviously wrong...
I'm using buildroot release tag 2020.05...

Thanks in advance,
Regards,

-----Original Message-----
From: Peter Seiderer <ps.report@gmx.net> 
Sent: Monday, October 19, 2020 9:11 PM
To: rob.r374 at gmail.com
Cc: buildroot at busybox.net
Subject: Re: [Buildroot] OpenSSL & Mosquitto on ARM Cortex M7

Hello Rob,

On Mon, 19 Oct 2020 02:20:00 +0200, <rob.r374@gmail.com> wrote:

> Hello,
>
>
>
> I'm trying to include Mosquitto with OpenSSL support on Buildroot.
>
>
>
> On working Buildroot basic build, I've added packages and setup static 
> libs
> :
>
> BR2_PACKAGE_LIBOPENSSL=y
>
> BR2_PACKAGE_MOSQUITTO=y
>
> BR2_PACKAGE_MBEDTLS=y
>
> BR2_STATIC_LIBS=y
>
> If I try to run Mosquitto tools (and MbedTLS test), I get :
>
> ~ # mosquitto_pub
>
> binfmt_flat: reference 0xffb4d0 to shared library 127, killing 
> mosquitto_pub!
>
> SEGV
>
> ~ # mosquitto_sub
>
> Error: You must specify a topic to subscribe to.
>
> Use 'mosquitto_sub --help' to see usage.
>
>
>
> ~ # ssl_client2
>
> sh: can't execute 'ssl_client2': No such file or directory
>
>
>
> It's weird, because mosquitto_pub complains about shared lib, but I 
> have defined static libraries only (at least I think so).
>
> In addition, mosquitto_sub works, but it seems it doesn't receive SSL 
> related arguments - seems like it was not compiled with OpenSSL lib.
>
> Also, ssl_client2 or other tools from MbedTLS cannot be found.
>
>
>
> How to solve those problems ?
>
>
>
> Also I'm not sure how to check for each package - compilation, 
> installation, errors, warnings etc.

Did you do/try a full rebuild after changing your config ([1])?

If the problem still exists after a full rebuild please provide your .config
or defconfig file and the buildroot version your are using...

Regards,
Peter

[1] https://buildroot.org/downloads/manual/manual.html#full-rebuild

>
>
>
> Regards,
>
> Rob.
>
>
>
>
>
>
>

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