[Linphone-developers] newbie trying to cross compile G729 library for ARM9

[Michael Jacobson]

So, as the subject states, i am very much a newbie. i am new to linux in general, new to open source libraries, new to mailing lists, etc etc...i am also new to cmake and makefiles, also to configure and autogen stuff so i am pretty lost.

so i am sure this is very basic but i am having a heck of a time finding something that works.

i am running on Ubuntu 16.04, i am trying to compile the static libbcg729.a file for the bcg729 library on my ARM AM4378 A9 processor target. the goal is to use the library in a c project to handle g729 encode and decode. ​

our SDK provides a file that preloads a bunch of environment variables for us when we wish to compile projects. the file looks like this:

SDK_PATH="/home/ULTRATEC/michael_j/ti-processor-sdk-linux-am437x-evm-04.03.00.05/linux-devkit"

if [ -z "$ZSH_NAME" ] && [ "x$0" = "x./environment-setup" ]; then

    echo "Error: This script needs to be sourced. Please run as \". ./environment-setup\""

    exit 1

else

    if [ -n "$BASH_SOURCE" ]; then

        SDK_PATH="`dirname $BASH_SOURCE`"

    fi

    SDK_PATH=`readlink -f "$SDK_PATH"`

    export SDK_PATH

fi

export SDK_SYS=x86_64-arago-linux

export REAL_MULTIMACH_TARGET_SYS=armv7ahf-neon-linux-gnueabi

export TOOLCHAIN_SYS=arm-linux-gnueabihf

export TOOLCHAIN_PREFIX=$TOOLCHAIN_SYS-

export SDK_PATH_NATIVE=$SDK_PATH/sysroots/$SDK_SYS

export SDK_PATH_TARGET=$SDK_PATH/sysroots/$REAL_MULTIMACH_TARGET_SYS

export PATH=$SDK_PATH_NATIVE/usr/bin:$SDK_PATH_NATIVE/usr/bin/arm-linux-gnueabi:$PATH

export CPATH=$SDK_PATH_TARGET/usr/include:$CPATH

export PKG_CONFIG_SYSROOT_DIR=$SDK_PATH_TARGET

export PKG_CONFIG_PATH=$SDK_PATH_TARGET/usr/lib/pkgconfig

export PKG_CONFIG_ALLOW_SYSTEM_LIBS=1

export CONFIG_SITE=$SDK_PATH/site-config-$REAL_MULTIMACH_TARGET_SYS

export CC=${TOOLCHAIN_PREFIX}gcc

export CXX=${TOOLCHAIN_PREFIX}g++

export GDB=${TOOLCHAIN_PREFIX}gdb

export CPP="${TOOLCHAIN_PREFIX}gcc -E"

export NM=${TOOLCHAIN_PREFIX}nm

export AS=${TOOLCHAIN_PREFIX}as

export AR=${TOOLCHAIN_PREFIX}ar

export RANLIB=${TOOLCHAIN_PREFIX}ranlib

export OBJCOPY=${TOOLCHAIN_PREFIX}objcopy

export OBJDUMP=${TOOLCHAIN_PREFIX}objdump

export STRIP=${TOOLCHAIN_PREFIX}strip

export CONFIGURE_FLAGS="--target=arm-linux-gnueabi --host=arm-linux-gnueabi --build=x86_64-linux --with-libtool-sysroot=$SDK_PATH_TARGET"

export CPPFLAGS=" -march=armv7-a -marm -mfpu=neon  -mfloat-abi=hard --sysroot=$SDK_PATH_TARGET"

export CFLAGS="$CPPFLAGS"

export CXXFLAGS="$CPPFLAGS"

export LDFLAGS=" --sysroot=$SDK_PATH_TARGET"

export OECORE_NATIVE_SYSROOT=$SDK_PATH_NATIVE

export OECORE_TARGET_SYSROOT=$SDK_PATH_TARGET

export OECORE_ACLOCAL_OPTS="-I $SDK_PATH_NATIVE/usr/share/aclocal"

export OECORE_DISTRO_VERSION="2017.12"

export OECORE_SDK_VERSION="2017.12"

export PS1="\[\e[32;1m\][linux-devkit]\[\e[0m\]:\w> "

export PATH=$SDK_PATH_NATIVE/usr/bin/qt5:$PATH

export OE_QMAKE_CFLAGS="$CFLAGS"

export OE_QMAKE_CXXFLAGS="$CXXFLAGS"

export OE_QMAKE_LDFLAGS="$LDFLAGS"

export OE_QMAKE_CC=$CC

export OE_QMAKE_CXX=$CXX

export OE_QMAKE_LINK=$CXX

export OE_QMAKE_AR=$AR

export OE_QMAKE_LIBDIR_QT=$SDK_PATH_TARGET/usr/lib

export OE_QMAKE_INCDIR_QT=$SDK_PATH_TARGET/usr/include/qt5

export OE_QMAKE_HOST_BINDIR_QT=$SDK_PATH_NATIVE/usr/bin/qt5/

export OE_QMAKE_MOC=$SDK_PATH_NATIVE/usr/bin/qt5/moc

export OE_QMAKE_UIC=$SDK_PATH_NATIVE/usr/bin/qt5/uic

export OE_QMAKE_UIC3=$SDK_PATH_NATIVE/usr/bin/qt5/uic3

export OE_QMAKE_RCC=$SDK_PATH_NATIVE/usr/bin/qt5/rcc

export OE_QMAKE_QDBUSCPP2XML=$SDK_PATH_NATIVE/usr/bin/qt5/qdbuscpp2xml

export OE_QMAKE_QDBUSXML2CPP=$SDK_PATH_NATIVE/usr/bin/qt5/qdbusxml2cpp

export OE_QMAKE_QT_CONFIG=$SDK_PATH_TARGET/usr/lib/qt5/mkspecs/qconfig.pri

export OE_QMAKE_STRIP="echo"

export QMAKESPEC=$SDK_PATH_TARGET/usr/lib/qt5/mkspecs/linux-oe-g++

export QMAKE_DEFAULT_LIBDIRS=${QT_QMAKE_LIBDIR_QT}

export QMAKE_DEFAULT_INCDIRS=${QT_QMAKE_INCDIR_QT}

i assume that i need to "source" this file before i run any of the make/configure scripts. that might be my first misconception

i found that the normal way to build an open source library for cross compiling is to include "--host=<build tools prefix>" but that seems to apply to libraries that come with a configure file to begin with. with this library the instructions tell me to do a cmake, then a make, but nothing about configuration. furthermore you have to run autogen.sh to get the configuration file. this is quite a few more steps than the general use case i am finding in my search so i can't help but wonder if i am making a mistake on step 1

it also appears that commands need to accompany cmake to enable cross compiling, i've tried a few and every one resulted in:

"Manually-specified variables were not used by the project:"

and when i try to run "./configuration" in my special environment setup with "--host=" i get:

"checking for arm-linux-gnueabihf-gcc... no

checking for gcc... gcc"

so it doesn't seem to be loading my cross compiler

so i'm a bit lost and i am having a hard time finding information online on how to solve my problem. i hope i don't bother too many people with my beginner question but i'm not really sure where to go to ask.

once i have the answer do i have to delete the project and reclone it from git or can i rerun the scripts again where they currently are?

thank you for any help you can provide me