====== C++ compile link ======
===== ENV Variables =====
This is output from ./configure --help

  CC          C compiler command
  CFLAGS      C compiler flags
  LDFLAGS     linker flags, e.g. -L<lib dir> if you have libraries in a
              nonstandard directory <lib dir>
  LIBS        libraries to pass to the linker, e.g. -l<library>
  CPPFLAGS    (Objective) C/C++ preprocessor flags, e.g. -I<include dir> if
              you have headers in a nonstandard directory <include dir>
  CPP         C preprocessor
  CXX         C++ compiler command
  CXXFLAGS    C++ compiler flags
  CXXCPP      C++ preprocessor
  PKG_CONFIG  path to pkg-config utility
  PKG_CONFIG_PATH
              directories to add to pkg-config's search path
  PKG_CONFIG_LIBDIR
              path overriding pkg-config's built-in search path

The resulting compile command will be: 

    $CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5

<code>
/home/td/src/dtn/android-toolchain-p8/bin/arm-linux-androideabi-g++ \

-g --sysroot=/home/td/src/dtn/android-toolchain-p8/sysroot \
-I/home/td/src/dtn/ibrdtn_ndk/target/include -I/home/td/src/dtn/ibrdtn_ndk/target/include/netlink -I/home/td/src/dtn/ibrdtn_ndk/target/include -I/home/td/src/dtn/ibrdtn_ndk/target/include/libnl3 -I/home/td/devfs/opt/android-ndk-r7/sources/cxx-stl/gnu-libstdc++/include -DANDROID \

-Wl,-rpath-link=/home/td/src/dtn/android-toolchain-p8/lib/gcc/arm-linux-androideabi/4.4.3 -nostdlib -o dtnd Main.o \

-L/home/td/src/dtn/ibrdtn_ndk/ibrcommon-0.6.5/ibrcommon/.libs -L/home/td/src/dtn/ibrdtn_ndk/ibrdtn-0.6.5/ibrdtn/.libs -L/home/td/devfs/opt/android-ndk-r7/sources/cxx-stl/gnu-libstdc++/libs/armeabi -L/home/td/src/dtn/ibrdtn_ndk/target/lib \

./.libs/libdtnd.a -lnl /home/td/src/dtn/ibrdtn_ndk/ibrdtn-0.6.5/ibrdtn/.libs/libibrdtn.a /home/td/src/dtn/ibrdtn_ndk/ibrcommon-0.6.5/ibrcommon/.libs/libibrcommon.a -lgnustl_shared -lsupc++ -lstdc++ /home/td/src/dtn/android-toolchain-p8/lib/gcc/arm-linux-androideabi/4.4.3/libgcc.a -lc -lm
</code>
===== Compile =====

===== Linking =====

==== Archive ====
--whole-archive

--no-whole-archive

Like in dynamic linking (?) symbols in an archive are only linked when they are needed. So it's important to use the correct order libb, liba (where libb uses symboles in liba). To tell ld to link the whole archive one can use the --whole-archive libx liby --no-whole-archive ( or -Wl,-whole-archive and -Wl,-no-whole-archive when input to g++).

When passed to LDFLAGS this order is brocken --> TODO find solution.

When compiled, archive is treated as collection of objects so just put it behind -I... in gcc command. If the result is an archive, itt will be nested in the resulting archive.