anchor.diff:      --with-system-zlib \
       --with-linker-hash-style=gnu"
   
  -ENV PATH="/gcc/bin:${PATH}"
  +ENV PATH="/gcc-${GCC_VERSION}/bin:${PATH}"
   
  -RUN apk --no-cache upgrade \
  +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 \
  
positive.code:   && cd .. \
    && mkdir objdir \
    && cd objdir \
    && ./../gcc-${GCC_VERSION}/configure --prefix=/gcc \
    --mandir=/usr/share/man \
    --infodir=/usr/share/info \
    --build=x86_64-alpine-linux-musl \
    --host=x86_64-alpine-linux-musl \
    --target=x86_64-alpine-linux-musl \
    --with-pkgversion="Alpine ${GCC_VERSION}" \
    --enable-checking=release \
    --disable-fixed-point \
    --disable-libstdcxx-pch \
  
negative.code: FROM alpine:3.8
  ARG BUILD_CORES
  
  ARG GCC_VERSION=8.2.0
  
  ARG GCC_CONF=" \
      --prefix=/gcc-${GCC_VERSION} \
      --mandir=/usr/share/man \
      --infodir=/usr/share/info \
      --build=x86_64-alpine-linux-musl \
  