modify Dockerfile.cuda10_cudnn7_gcc8_ubuntu16 gcc8 logic (#24749)

tools/manylinux1/Dockerfile.cuda10_cudnn7_gcc8_ubuntu16

@@ -19,6 +19,15 @@ ENV HOME /root
 # Add bash enhancements
 COPY ./paddle/scripts/docker/root/ /root/
 
+ENV PATH=/usr/local/gcc-8.2/bin:$PATH
+RUN rm -rf /temp_gcc82 && rm -rf /gcc-8.2.0.tar.xz && rm -rf /gcc-8.2.0
+
+# Prepare packages for Python
+RUN apt-get update && \
+    apt-get install -y make build-essential libssl-dev zlib1g-dev libbz2-dev \
+    libreadline-dev libsqlite3-dev wget curl llvm libncurses5-dev libncursesw5-dev \
+    xz-utils tk-dev libffi-dev liblzma-dev
+
 # gcc8.2
 RUN wget -q https://paddle-docker-tar.bj.bcebos.com/home/users/tianshuo/bce-python-sdk-0.8.27/gcc-8.2.0.tar.xz && \
   tar -xvf gcc-8.2.0.tar.xz && \
@@ -33,23 +42,6 @@ RUN wget -q https://paddle-docker-tar.bj.bcebos.com/home/users/tianshuo/bce-pyth
 ENV PATH=/usr/local/gcc-8.2/bin:$PATH
 RUN rm -rf /temp_gcc82 && rm -rf /gcc-8.2.0.tar.xz && rm -rf /gcc-8.2.0
 
-# Prepare packages for Python
-RUN apt-get update && \
-    apt-get install -y make build-essential libssl-dev zlib1g-dev libbz2-dev \
-    libreadline-dev libsqlite3-dev wget curl llvm libncurses5-dev libncursesw5-dev \
-    xz-utils tk-dev libffi-dev liblzma-dev
-
-# Downgrade gcc&&g++
-RUN apt-get update
-WORKDIR /usr/bin
-RUN apt install -y gcc-4.8 g++-4.8
-RUN cp gcc gcc.bak
-RUN cp g++ g++.bak
-RUN rm gcc
-RUN rm g++
-RUN ln -s gcc-4.8 gcc
-RUN ln -s g++-4.8 g++
-
 # Install Python3.6
 RUN mkdir -p /root/python_build/ && wget -q https://www.sqlite.org/2018/sqlite-autoconf-3250300.tar.gz && \
     tar -zxf sqlite-autoconf-3250300.tar.gz && cd sqlite-autoconf-3250300 && \