Hello forum.
This is my first question in this forum, so hope to ask in the proper channel. If not, please suggest a better channel to ask again.
I have built from scratch a custom toolchain for a MIPS 24kc (dragino) target platform, using gcc-6.3.0, musl-1.1.16 and binutils-2.27. That toolchain is completely functional.
However, the size of my-custom toolchain is five times bigger than size of equivalent OpenWRT generated toolchain (557M vs 113M). Toolchain binaries generated by OpenWRT (mips-openwrt-linux-musl-*) are dynamically linked against libstdc++ and libgcc_s libraries. However, my toolchain binaries have these libs statically linked:
$ ldd mips-openwrt-linux-musl-gcc-5.3.0
linux-vdso.so.1 => (0x00007ffc4d534000)
libstdc++.so.6 => /usr/lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007f878936f000)
libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007f8789159000)
libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f8788d8f000)
libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f8788a86000)
/lib64/ld-linux-x86-64.so.2 (0x000055df3ef8b000)
$ ldd mips-linux-musl-gcc-6.3.0
linux-vdso.so.1 => (0x00007ffd40940000)
libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f2de4b8f000)
libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f2de47c6000)
/lib64/ld-linux-x86-64.so.2 (0x0000560bba4b6000)The same issue happens with cc1 (124MB vs 14MB) and cc1plus (134MB vs 15MB) binaries.
What is the proper way to setup cross-toolchain generation to get a so small cross-platform toolchain? These are the steps I'm doing to build my-custom toolchain
Download sources:
binutils-2.27.tar.bz2
gcc-6.3.0.tar.bz2
linux-3.12.6.tar.bz2
musl-1.1.16.tar.gz
mpfr-3.1.5.tar.bz2
gmp-6.1.2.tar.bz2
mpc-1.0.2.tar.gzSetup environ:
export ROOTDIR="${HOME}/custom-toolchains/MIPS"
export NATIVE_PREFIX="${ROOTDIR}/opt/native"
export CROSS_PREFIX="${ROOTDIR}/opt/cross"
export TARGET_MACHINE=mips
export CPU=mips
export ARCH=24kc
export CLIB=musl
export TARGET_TRIPLET=${CPU}-linux-${CLIB} Build native binutils:
cd ${ROOTDIR}/src
mkdir build-binutils
cd build-binutils
../binutils-2.27/configure --prefix="${NATIVE_PREFIX}" --disable-nls --disable-werror --disable-multilib
make
make install Build native gcc:
cd ${ROOTDIR}/src/gcc-6.3.0
ln -s ../mpfr-3.1.5 mpfr
ln -s ../gmp-6.1.2 gmp
ln -s ../mpc-1.0.3 mpc
cd ..
mkdir build-gcc
cd build-gcc
../gcc-6.3.0/configure --prefix=${NATIVE_PREFIX} --disable-nls --enable-languages=c --disable-multilib
make
make install Build cross-binutils:
cd ${ROOTDIR}/src
mkdir build-${CPU}-binutils
cd build-${CPU}-binutils
../binutils-2.27/configure --target=${TARGET_TRIPLET} --prefix=${CROSS_PREFIX} --with-sysroot --disable-nls --disable-werror --disable-multilib
make
make install Install kernel headers:
cd ${ROOTDIR}/src
cd linux-3.12.6
make ARCH=${TARGET_MACHINE} INSTALL_HDR_PATH=${CROSS_PREFIX}/${TARGET_TRIPLET} headers_installBuild cross-gcc (stage 1)
cd ${ROOTDIR}/src
mkdir build-bootstrap-${CPU}-gcc
cd build-bootstrap-${CPU}-gcc
../gcc-6.3.0/configure --target=${TARGET_TRIPLET} --prefix=${CROSS_PREFIX} --disable-nls --enable-languages=c --disable-multilib --disable-threads --disable-shared --with-float=soft --with-arch=${ARCH}
make all-gcc install-gcc
make all-target-libgcc install-target-libgcc Build cross-musl
cd ${ROOTDIR}/src
mkdir build-${CLIB}
cd build-${CLIB}
CC=${TARGET_TRIPLET}-gcc CFLAGS=-Wa,-msoft-float ../musl-1.1.16/configure --prefix=${CROSS_PREFIX}/${TARGET_TRIPLET}/ --enable-optimize CROSS_COMPILE=${TARGET_TRIPLET}-
make
make install Build cross-gcc (stage 2)
cd ${ROOTDIR}/src
mkdir build-${CPU}-gcc
cd build-${CPU}-gcc
../gcc-6.3.0/configure --target=${TARGET_TRIPLET} --prefix=${CROSS_PREFIX} --disable-nls --enable-languages=c,c++ --disable-multilib --enable-threads --enable-shared --with-float=soft --with-arch=${ARCH} --enable-target-optspace --disable-libgomp --disable-libmudflap --without-isl --without-cloog --disable-decimal-float --disable-libssp --disable-libsanitizer --enable-lto --with-host-libstdcxx=-lstdc++
make
make install Thank you for all your comments in advance! 
(Last edited by aicastell on 3 Feb 2017, 09:41)