set path=( /bin /usr/bin /sbin /usr/sbin )

env                                                             \
        CC=$L/bin/gcc-7                                         \
        CONFIGUREFLAGS="--without-isl --disable-multilib"       \
        CXX=$L/bin/g++-7                                        \
        GMPPREFIX=$L/gmp                                        \
        GNAT=$L/bin/gnat-7                                      \
        GNATBIND=$L/bin/gnatbind-7                              \
        GNATMAKE=$L/bin/gnatmake-7                              \
        LANGS=ada,brig,,c,c++,fortran,go,objc,obj-c++           \
        prefix=$L                                               \
        $G/gcc/build-dgcc.sh gcc-8-20171112


( chdir $L/bin ; $G/gcc/make-gcc-wrapper.sh gcc-8-20171112 )
( chdir $L/bin/ ; env VER1=8 VER2=8.0 VER3=8.0.0 $G/gcc/make-gcc-links.sh gcc-8-20171112 )

------------------------------------------------------------------------

The build-dgcc.sh script reports:

        nice time env CC="$L/bin/gcc-7"                                                 \
                      CXX="$L/bin/g++-7"                                                \
                      CFLAGS=""                                                         \
                      CPPFLAGS=""                                                       \
                      CXXFLAGS=""                                                       \
                      LDFLAGS="-L$L/lib -Wl,-rpath,$L/lib"                              \
                ../gcc-8-20171112/configure                                             \
                        --disable-nls                                                   \
                        --enable-decimal-float=dpd                                      \
                        --enable-languages=ada,brig,,c,c++,fortran,go,objc,obj-c++      \
                        --with-gmp=$L/gmp                                               \
                        --with-mpfr=$L/gmp                                              \
                        --with-mpc=$L/gmp                                               \
                        --prefix=$L/ashare/gcc/gcc-8-20171112                           \
                        --libdir=$L/ashare/gcc/gcc-8-20171112/lib64                     \
                        --without-isl                                                   \
                        --disable-multilib                                              &&
        nice time $L/bin/gmake -j48 bootstrap