configure.ac: use pkg-config to retrieve openssl dependencies

[ffontaine]

Use pkg-config to retrieve openssl dependencies such as -latomic and avoids the following build failure when building statically on architectures such as sparc:

/home/autobuild/autobuild/instance-1/output-1/host/lib/gcc/sparc-buildroot-linux-uclibc/10.4.0/../../../../sparc-buildroot-linux-uclibc/bin/ld: /home/autobuild/autobuild/instance-1/output-1/host/sparc-buildroot-linux-uclibc/sysroot/usr/lib/libcrypto.a(threads_pthread.o): in function `CRYPTO_atomic_add': threads_pthread.c:(.text+0x208): undefined reference to `__atomic_is_lock_free'

Fixes:

• http://autobuild.buildroot.org/results/49abbaa1eab94b248bff434b40728065d687e278

Signed-off-by: Fabrice Fontaine [email protected]

[ffontaine]

Do you have some comments on this PR?

[tridge]

with autoconf 2.71 I get this:

checking whether to enable use of openssl crypto library... ./configure: line 7719: syntax error near unexpected token `LIBCRYPTO,'
./configure: line 7719: `      PKG_CHECK_MODULES(LIBCRYPTO, libcrypto,'

maybe bitrotted?

[ffontaine]

Thanks for your feedback.

Patch has been applied in buildroot since February (https://git.buildroot.net/buildroot/commit/?id=e889a1c9e983753dd0fa5062d3b9475a8cba6072) and no build failures are raised by autobuilders since that time.

It should be noted that configure must be rebuilt (thanks to autoreconf ) after applying this patch. which updates configure.ac.
Could you also try to add PKG_PROG_PKG_CONFIG before PKG_CHECK_MODULES? This macro will check if pkg-config is available on your system.

[tridge]

@ffontaine it was fine after "make reconfigure". Note sure why autoconf didn't generate a good configure script for me yesterday. It's been many years since I worked with autoconf - about 20 years in fact, when I handed over to Wayne :-)

[tridge]

@WayneD I'm happy with this

[vilkov]

Hey @tridge, @WayneD can we have this merged, please?