[Buildroot] [PATCH] libarchive: avoid some tools to build statically on shared builds

[Romain Naour <romain.naour@openwide.fr>]

Hi Thomas, Vicente

Le 29/08/2014 17:59, Vicente Olivert Riera a ?crit :
> On 08/29/2014 04:42 PM, Thomas Petazzoni wrote:
>> Dear Vicente Olivert Riera,
>>
>> On Fri, 29 Aug 2014 14:39:07 +0100, Vicente Olivert Riera wrote:
>>> Some libarchive tools, like bsdtar, builds statically by default
>>> although libarchive itself is being built dynamically. We can force
>>> those tools to build the same way as libarchive by using the right
>>> configure options.
>>>
>>> Fixes:
>>>   
>>> http://autobuild.buildroot.net/results/b8f/b8f7a29787ea1cc5c98e4cbd5f47f257f9b306f2/
>>>
>>>
>>> Signed-off-by: Vicente Olivert Riera <Vincent.Riera@imgtec.com>
>>> ---
>>>   package/libarchive/libarchive.mk |   24 +++++++++++++++++++++---
>>>   1 files changed, 21 insertions(+), 3 deletions(-)
>>>
>>> diff --git a/package/libarchive/libarchive.mk b/package/libarchive/libarchive.mk
>>> index 8c6951d..979e65c 100644
>>> --- a/package/libarchive/libarchive.mk
>>> +++ b/package/libarchive/libarchive.mk
>>> @@ -9,9 +9,27 @@ LIBARCHIVE_SITE = http://www.libarchive.org/downloads
>>>   LIBARCHIVE_INSTALL_STAGING = YES
>>>   LIBARCHIVE_LICENSE = BSD-2c, BSD-3c
>>>   LIBARCHIVE_LICENSE_FILES = COPYING
>>> -LIBARCHIVE_CONF_OPT = --without-lzma \
>>> -    $(if $(BR2_PACKAGE_LIBARCHIVE_BSDTAR),--enable-bsdtar,--disable-bsdtar) \
>>> -    $(if $(BR2_PACKAGE_LIBARCHIVE_BSDCPIO),--enable-bsdcpio,--disable-bsdcpio)
>>> +LIBARCHIVE_CONF_OPT = --without-lzma
>>> +
>>> +ifeq ($(BR2_PACKAGE_LIBARCHIVE_BSDTAR),y)
>>> +ifeq ($(BR2_PREFER_STATIC_LIB),y)
>>> +LIBARCHIVE_CONF_OPT += --enable-bsdtar=static
>>> +else
>>> +LIBARCHIVE_CONF_OPT += --enable-bsdtar=shared
>>> +endif
>>> +else
>>> +LIBARCHIVE_CONF_OPT += --disable-bsdtar
>>> +endif
>>> +
>>> +ifeq ($(BR2_PACKAGE_LIBARCHIVE_BSDCPIO),y)
>>> +ifeq ($(BR2_PREFER_STATIC_LIB),y)
>>> +LIBARCHIVE_CONF_OPT += --enable-bsdcpio=static
>>> +else
>>> +LIBARCHIVE_CONF_OPT += --enable-bsdcpio=shared
>>> +endif
>>> +else
>>> +LIBARCHIVE_CONF_OPT += --disable-bsdcpio
>>> +endif
>>>
>>>   ifeq ($(BR2_PACKAGE_ACL),y)
>>>   LIBARCHIVE_DEPENDENCIES += acl
>>
>> Could you check if it fixes
>> http://autobuild.buildroot.org/results/068/068febe05909af15f6620d7925f375c5da154bda/build-end.log
>> ?
>>
>> Thanks!
>>
>> Thomas
> 
> Confirmed, it also fixes that problem in ARM.
> 
> For MIPS, the real problem is this one:
> 
> http://git.uclibc.org/uClibc/patch/?id=b57e9640db53166c88cdac66b79a046e46b8d728
> 
> So we have two options. Apply that patch for uClibc ( another one :-( ), or just
> fix the libarchive package as I did.
> 
> For ARM, I don't know what the problem is, because that toolchain (the one used
> in the build log you told me) is not uClibc.
> 

For ARM the problem is that libarchive build system use the same variable
$(LIBS) to link the shared library and link statically bsdtar and bsdcpio.

When BR2_PREFER_STATIC_LIB is disabled, $(LIBS) contains "-lcrypto -lexpat
-llzo2 -lz"

So, when bsdtar and bsdcpio are linked "-ldl" is missing due to a dependency of
OpenSSL on libdl.

# pkg-config --libs-only-l -static openssl
-lssl -lcrypto -ldl

# pkg-config --libs-only-l openssl
-lssl -lcrypto

If there is no particular reason to build statically bsdtar and bsdcpio when
BR2_PREFER_STATIC_LIB is disabled, then I'm ok with your patch.

Tested-by: Romain Naour <romain.naour@openwide.fr>

Build tested with a custom uClibc 0.9.33 toolchain for mipsel
Build tested with the ARM glibc toolchain used by autobuilder.

Best regards,
Romain