[Clfs-support] [Native Compiler] Problem Cross-compiling GMP MPFR and MPC

[Michele Bucca]

Il 14 apr 2017 5:34 PM, "William Harrington" <kb0iic at berzerkula.org> ha scritto:
>
> On Fri, April 14, 2017 13:27, Michele Bucca wrote:
> > Il 14 apr 2017 3:15 PM, "William Harrington" <kb0iic at berzerkula.org> ha
> > scritto:
> >>
> >> On Fri, April 14, 2017 08:15, Michele Bucca wrote:
> >> > Hello Everyone,
> >> >
> >> > I'm trying to cross-compile a native host-x-host compiler with the
> >> > musl-libc library
> >> >
> >> > To do that I have to
> >> >
> >> > 1) compile a cross-compiler. (Done)
> >> > 2) Install GMP, MPFR and MPC on the cross-compiler
> >> > 3) make a host-x-host cross-compile to make a native compiler
> >> >
> >>
> >> Hello Michele,
> >>
> >> I also wanted to add, in case there is any confusion, that this may shed
> >> some light:
> >>
> >> https://gcc.gnu.org/onlinedocs/gccint/Configure-Terms.html
> >>
> >> Another option, which may be better, is to build gmp, mpfr and mpc
> >> in-tree
> >> with the GCC source when you build it.  Extract mpfr, gmp and mpc into
> >> the
> >> source code so it is laid out:
> >>
> >> gcc-5.3.0/gmp
> >> gcc-5.3.0/mpfr
> >> gcc-5.3.0/mpc
> >> gcc-5.3.0/isl (if also inclulding isl)
> >>
> >> then configure:  mkdir gcc-build && cd ../gcc-build && (needed flags
> >> here)
> >> ../gcc-5.3.0/configure (configure options here excluding --with-gmp
> >> --with-mpfr --with-mpc)
> >>
> >
> > As I want to build a static version of GCC I will specify these variables:
> >
> > export CC="i486-linux-musl-gcc -static -Wl,-Bstatic -static-libgcc"
> > export CXX="i486-linux-musl-gcc -static -Wl,-Bstatic -static-libgcc"
> >
> > will this have weird effects if I extract those three libraries source
> > inside the GCC source tree and compile them with it?
> > --Michele
> >
> >> Sincerely,
> >>
> >> William
>
> Hello Michele,
>
> GCC will use the gmp/mpfr/mpc in-tree without issue. I do it quite a bit
> with my own cross-compiles. Just make sure you follow the GCC installation
> documentation regarding gmp/mpfr/mpc at:
>
> https://gcc.gnu.org/install/prerequisites.html
>
> Also, since this mailing list is specific to the CLFS books, you may wish
> to mention which book you are following as a guide for the musl
> cross-toolchain build.

I'm following CLFS-Embedded (Development)

>
> Sincerely,
>
> William

To compile GCC (the first pass) first I export some variables

export CC="i486-linux-musl-gcc -static -Wl,-Bstatic -static-libgcc"
export CXX="i486-linux-musl-g++ -static -Wl,-Bstatic -static-libgcc"

This should make the gcc executable static

../gcc-6.2.0/configure \
  --prefix=/home/michele/tmp/musl-native-toolchain/output \
  --build=x86_64-linux-gnu \
  --host=i486-linux-musl \
  --target=i486-linux-musl \
  --disable-nls  \
  --disable-shared \
  --without-headers \
  --with-newlib \
  --disable-decimal-float \
  --disable-libgomp \
  --disable-libmudflap \
  --disable-libssp \
  --disable-libatomic \
  --disable-libquadmath \
  --disable-threads \
  --enable-languages=c \
  --disable-multilib \

then I give the commands

make all-gcc all-target-libgcc


but the compile process fails with this error

# If this is the top-level multilib, build all the other
# multilibs.
i486-linux-musl-gcc   -g -O2 -O2  -g -O2 -DIN_GCC    -W -Wall
-Wno-narrowing -Wwrite-strings -Wcast-qual -Wstrict-prototypes
-Wmissing-prototypes -Wold-style-definition  -isystem ./include
-fpic -mlong-double-80 -DUSE_ELF_SYMVER -g -DIN_LIBGCC2
-fbuilding-libgcc -fno-stack-protector -Dinhibit_libc  -fpic
-mlong-double-80 -DUSE_ELF_SYMVER -I. -I. -I../.././gcc
-I../../../gcc-6.2.0/libgcc -I../../../gcc-6.2.0/libgcc/.
-I../../../gcc-6.2.0/libgcc/../gcc
-I../../../gcc-6.2.0/libgcc/../include
-I../../../gcc-6.2.0/libgcc/../libdecnumber/no
-I../../../gcc-6.2.0/libgcc/../libdecnumber -DHAVE_CC_TLS  -DUSE_TLS
-o decLibrary.o -MT decLibrary.o -MD -MP -MF decLibrary.dep -c
../../../gcc-6.2.0/libgcc/../libdecnumber/decLibrary.c
../../../gcc-6.2.0/libgcc/../libdecnumber/decLibrary.c:27:24: fatal
error: decimal128.h: No such file or directory
 #include "decimal128.h"
                        ^
compilation terminated.
Makefile:612: set di istruzioni per l'obiettivo "decLibrary.o" non riuscito
make[1]: *** [decLibrary.o] Errore 1
make[1]: uscita dalla directory
"/home/michele/tmp/musl-native-toolchain/obj-gcc/i486-linux-musl/libgcc"
Makefile:12314: set di istruzioni per l'obiettivo "all-target-libgcc"
non riuscito
make: *** [all-target-libgcc] Errore 2

I don't use the sysroot so I can move the toolchain in a different
directory without breaking it. Yes I know that the host and target
swith are the same..I want to obtain a compiler like the one that is
used to create a CLFS temporary system.


See Here:
http://www.clfs.org/view/CLFS-3.0.0-SYSVINIT/x86/temp-system/gcc.html


Any help? Thanks

-- Michele

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