strongswan: fix build failure when host == target architecture
The strongswan configure.in uses the AC_LIB_PREFIX macro, which adds --with-lib-prefix and --without-lib-prefix options, and which, by default assumes that adding ${prefix}/lib to LDFLAGS and ${prefix}/include to CPPFLAGS is a good idea. Obviously, when cross-compiling, it is definitely not a good idea. In the specific case of strongswan, the result is that when testing if the backtrace() function was available, the small C program was being built and linked with -L/usr/lib. So when the host architecture and target architecture are identical, it may find the backtrace() function in the host C library, without looking at the target C library: configure:16457: /home/test/outputs/a637f916962b6136dd6dd4f4b9ff4e1cab568ef3/output/host/usr/bin/x86_64-unknown-linux-uclibc-gcc -o conftest -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -pipe -Os -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -L/usr/lib conftest.c >&5 /home/test/outputs/a637f916962b6136dd6dd4f4b9ff4e1cab568ef3/output/host/opt/ext-toolchain/bin/../lib/gcc/x86_64-unknown-linux-uclibc/4.6.3/../../../../x86_64-unknown-linux-uclibc/bin/ld: warning: libc.so.0, needed by /home/test/outputs/a637f916962b6136dd6dd4f4b9ff4e1cab568ef3/output/host/opt/ext-toolchain/bin/../lib/gcc/x86_64-unknown-linux-uclibc/4.6.3/../../../../x86_64-unknown-linux-uclibc/lib/../lib64/libgcc_s.so, may conflict with libc.so.6 Passing --without-lib-prefix prevents this default behavior from happening, and no stupid value is added to CPPFLAGS or LDFLAGS. Fixes: http://autobuild.buildroot.net/results/a637f916962b6136dd6dd4f4b9ff4e1cab568ef3/ Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
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@ -11,6 +11,7 @@ STRONGSWAN_LICENSE = GPLv2+
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STRONGSWAN_LICENSE_FILES = COPYING LICENSE
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STRONGSWAN_DEPENDENCIES = host-pkgconf
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STRONGSWAN_CONF_OPT += \
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--without-lib-prefix \
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--enable-pkcs11=yes \
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--enable-kernel-netlink=$(if $(BR2_INET_IPV6),yes,no) \
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--enable-socket-default=$(if $(BR2_INET_IPV6),yes,no) \
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