anchor.diff:    --enable-tls \
     --with-system-zlib \
     --with-linker-hash-style=gnu \
  -  && make all-gcc \
  -  && make all-target-libgcc \
  -  && make install-gcc \
  -  && make install-target-libgcc \
  +  && make -j ${NB_CORES} \
     && make install-strip \
     && rm -rf /tmp/* /usr/share/man \
     && apk del --no-cache build-base zlib-dev
  
positive.code: FROM alpine:3.8
  
  ARG GCC_VERSION=8.2.0
  
  ARG GCC_CONF=" \
      --prefix=/gcc \
      --mandir=/usr/share/man \
      --infodir=/usr/share/info \
      --build=x86_64-alpine-linux-musl \
  
negative.code:     --with-system-zlib \
      --with-linker-hash-style=gnu"
  
  ENV PATH="/gcc-${GCC_VERSION}/bin:${PATH}"
  
  RUN NB_CORES=${BUILD_CORES-$(getconf _NPROCESSORS_CONF)} \
    && apk --no-cache upgrade \
    && apk add --no-cache build-base zlib-dev \
    && mkdir -p /gcc \
    && cd /tmp \
  