Gnuk with GCC >= 5

[Bertrand Jacquin]

On Mon, Aug 27, 2018 at 03:51:32PM +0900, NIIBE Yutaka wrote:
> Hello,
> 
> I wonder how you configure your gcc.

I let Gentoo do it for me :) Here is the configure statement:

 * strip-flags: CFLAGS: changed '-march=native -O2 -pipe -fomit-frame-pointer' to '-march=native -O2 -pipe'
 * strip-flags: CXXFLAGS: changed '-march=native -O2 -pipe -fomit-frame-pointer' to '-march=native -O2 -pipe'
 * CFLAGS="-O2 -pipe"
 * CXXFLAGS="-O2 -pipe"
 * LDFLAGS="-Wl,-O1 -Wl,--as-needed"

 * PREFIX:          /usr
 * BINPATH:         /usr/x86_64-pc-linux-gnu/arm-none-eabi/gcc-bin/7.3.0
 * LIBPATH:         /usr/lib/gcc/arm-none-eabi/7.3.0
 * DATAPATH:        /usr/share/gcc-data/arm-none-eabi/7.3.0
 * STDCXX_INCDIR:   /usr/lib/gcc/arm-none-eabi/7.3.0/include/g++-v7

 * Languages:       c,jit

 * Configuring GCC with:
 *      --host=x86_64-pc-linux-gnu
 *      --target=arm-none-eabi
 *      --build=x86_64-pc-linux-gnu
 *      --prefix=/usr
 *      --bindir=/usr/x86_64-pc-linux-gnu/arm-none-eabi/gcc-bin/7.3.0
 *      --includedir=/usr/lib/gcc/arm-none-eabi/7.3.0/include
 *      --datadir=/usr/share/gcc-data/arm-none-eabi/7.3.0
 *      --mandir=/usr/share/gcc-data/arm-none-eabi/7.3.0/man
 *      --infodir=/usr/share/gcc-data/arm-none-eabi/7.3.0/info
 *      --with-gxx-include-dir=/usr/lib/gcc/arm-none-eabi/7.3.0/include/g++-v7
 *      --with-python-dir=/share/gcc-data/arm-none-eabi/7.3.0/python
 *      --enable-languages=c,jit
 *      --enable-obsolete
 *      --enable-secureplt
 *      --disable-werror
 *      --with-system-zlib
 *      --enable-nls
 *      --without-included-gettext
 *      --enable-checking=release
 *      --with-bugurl=https://bugs.gentoo.org/
 *      --with-pkgversion=Gentoo Hardened 7.3.0-r3 p1.4
 *      --enable-esp
 *      --disable-libstdcxx-pch
 *      --enable-host-shared
 *      --enable-poison-system-directories
 *      --disable-libstdcxx-time
 *      --with-sysroot=/usr/arm-none-eabi
 *      --disable-bootstrap
 *      --with-newlib
 *      --enable-multilib
 *      --disable-altivec
 *      --disable-fixed-point
 *      --with-float=soft
 *      --disable-libgomp
 *      --disable-libmudflap
 *      --disable-libssp
 *      --disable-libcilkrts
 *      --disable-libmpx
 *      --enable-vtable-verify
 *      --enable-libvtv
 *      --disable-libquadmath
 *      --enable-lto
 *      --without-isl
 *      --disable-libsanitizer
 *      --enable-default-pie
 *      --enable-default-ssp


/var/tmp/portage/cross-arm-none-eabi/gcc-7.3.0-r3/work/gcc-7.3.0/configure --host=x86_64-pc-linux-gnu --target=arm-none-eabi --build=x86_64-pc-linux-gnu --prefix=/usr --bindir=/usr/x86_64-pc-linux-gnu/arm-none-eabi/gcc-bin/7.3.0 --includedir=/usr/lib/gcc/arm-none-eabi/7.3.0/include --datadir=/usr/share/gcc-data/arm-none-eabi/7.3.0 --mandir=/usr/share/gcc-data/arm-none-eabi/7.3.0/man --infodir=/usr/share/gcc-data/arm-none-eabi/7.3.0/info --with-gxx-include-dir=/usr/lib/gcc/arm-none-eabi/7.3.0/include/g++-v7 --with-python-dir=/share/gcc-data/arm-none-eabi/7.3.0/python --enable-languages=c,jit --enable-obsolete --enable-secureplt --disable-werror --with-system-zlib --enable-nls --without-included-gettext --enable-checking=release --with-bugurl=https://bugs.gentoo.org/ --with-pkgversion=Gentoo Hardened 7.3.0-r3 p1.4 --enable-esp --disable-libstdcxx-pch --enable-host-shared --enable-poison-system-directories --disable-libstdcxx-time --with-sysroot=/usr/arm-none-eabi --disable-bootstrap --with-newlib --enable-multilib --disable-altivec --disable-fixed-point --with-float=soft --disable-libgomp --disable-libmudflap --disable-libssp --disable-libcilkrts --disable-libmpx --enable-vtable-verify --enable-libvtv --disable-libquadmath --enable-lto --without-isl --disable-libsanitizer --enable-default-pie --enable-default-ssp

> Bertrand Jacquin <bertrand at jacquin.bzh> wrote:
> > Note that newlib remains the same when I am using gcc 4.9.4 or gcc 7.3.0
> 
> I think that newlib for gcc 7 should be configured/compiled by gcc 7. 

Yes, this was the case, everytime I rebuilt gcc, I also rebuild newlib.

> > * gcc-7.3.0
> [...]
> > build/chopstx.o: dynamic relocation against `chx_idle' in read-only section `.text.preempt'
> 
> Strange.  Dynamic relocation should never happen.  
> 
> > I am not sure which version of the libc this corresponds to
> 
> My libc for arm-none-eabi is:
> 
> 	Package: libnewlib-arm-none-eabi
> 	Version: 3.0.0.20180802-2
> 
> I think that the issue is not the souce version, but which gcc it is built.

newlib 3.0.0 is not available in gentoo yet unfortunately, even thought
a request for an update was made in https://bugs.gentoo.org/656018

Cheers

-- 
Bertrand
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