[Openswan Users] Cross compiling openswan for ARM

[Paul Wouters]

On Wed, 14 Sep 2011, satpal parmar wrote:

> I am trying to cross compile openswan for ARM Board. For that I am
>  following below steps:

> 1. Cross compiled GMP. 

>    c. Created a softlink to libgmp in the toolchain path

You also need to be able to find the gmp headers. Usually a "make install"
after cross compile installs those somewhere in your toolchain

>     a. Modified CROSSCOMPILE.sh as per my toolchain setttings
> 
>       export PREFIX=/usr/local/CodeSourcery/Sourcery_G++_Lite
>       export DESTDIR=/tmp/openswan.arm
>       export ARCH=arm
>       export CC=$PREFIX/bin/arm-none-linux-gnueabi-gcc
>       export GCC=$PREFIX/bin/arm-none-linux-gnueabi-gcc
>       export LD=$PREFIX/bin/arm-none-linux-gnueabi-ld
>       export RANLIB=$PREFIX/bin/arm-none-linux-gnueabi-ranlib
>       export AR=$PREFIX/bin/arm-none-linux-gnueabi-ar
>       export AS=$PREFIX/bin/arm-none-linux-gnueabi-as
>       export STRIP=$PREFIX/biin/arm-none-linux-gnueabi-strip
>       export
> LD_LIBRARY_PATH=$PREFIX/lib/gcc/arm-none-linux-gnueabi/4.3.3/

You left out the line from CROSSCOMPILE that adds the include file search
path, eg:

export USERCOMPILE="-Wl,-elf2flt -DCOMPILER_HAS_NO_PRINTF_LIKE -O3 -g ${PORTDEFI
NE} -I$PREFIX/arm-elf/inc -L$PREFIX/lib/gcc-lib -DGCC_LINT -DLEAK_DETECTIVE -Dli
nux -D__linux__"

In this case the gmp.h and other headers was installed in $PREFIX/arm-elf/inc

> 
>                  from openswan/openswan-2.6.33/lib/libopenswan/id.c:39:
> openswan/openswan-2.6.33/include/secrets.h:20:41: error: gmp.h: No such
> file or directory

It needs the gmp.h from the crosscompile, not the system one.

> Now from openswan site I got that libgmp is required for openswan
> compilation. Since I have already crosscomplied and softlinked I am not
> able to understand what is missing.

What's missing is the header files for that ARM architecture, which are
normally installed running "make install" on the cross compiled libgmp.

Paul