Integrate ccache into libusb and nginx build scripts for improved bui…

…ld speed (#6886)

* Add ccache to libusb and nginx build scripts

* Add ccache support to Dockerfile for faster builds

* Add ccache to PATH and use it for compiling nginx with Makefile in build_nginx.sh script

Dockerfile

@@ -18,10 +18,13 @@ WORKDIR /rootfs
 
 FROM base AS nginx
 ARG DEBIAN_FRONTEND
+ENV CCACHE_DIR /root/.ccache
+ENV CCACHE_MAXSIZE 2G
 
 # bind /var/cache/apt to tmpfs to speed up nginx build
 RUN --mount=type=tmpfs,target=/tmp --mount=type=tmpfs,target=/var/cache/apt \
     --mount=type=bind,source=docker/build_nginx.sh,target=/deps/build_nginx.sh \
+    --mount=type=cache,target=/root/.ccache \
     /deps/build_nginx.sh
 
 FROM wget AS go2rtc
@@ -61,14 +64,16 @@ RUN mkdir /models \
 FROM wget as libusb-build
 ARG TARGETARCH
 ARG DEBIAN_FRONTEND
+ENV CCACHE_DIR /root/.ccache
+ENV CCACHE_MAXSIZE 2G
 
 # Build libUSB without udev.  Needed for Openvino NCS2 support
 WORKDIR /opt
-RUN apt-get update && apt-get install -y unzip build-essential automake libtool
-RUN wget -q https://github.com/libusb/libusb/archive/v1.0.25.zip -O v1.0.25.zip && \
+RUN apt-get update && apt-get install -y unzip build-essential automake libtool ccache
+RUN --mount=type=cache,target=/root/.ccache wget -q https://github.com/libusb/libusb/archive/v1.0.25.zip -O v1.0.25.zip && \
     unzip v1.0.25.zip && cd libusb-1.0.25 && \
     ./bootstrap.sh && \
-    ./configure --disable-udev --enable-shared && \
+    ./configure CC='ccache gcc' CCX='ccache g++' --disable-udev --enable-shared && \
     make -j $(nproc --all)
 RUN apt-get update && \
     apt-get install -y --no-install-recommends libusb-1.0-0-dev && \

docker/build_nginx.sh

@@ -15,6 +15,10 @@ apt-get -yqq build-dep nginx
 
 apt-get -yqq install --no-install-recommends ca-certificates wget
 update-ca-certificates -f
+apt install -y ccache
+
+export PATH="/usr/lib/ccache:$PATH"
+
 mkdir /tmp/nginx
 wget -nv https://nginx.org/download/nginx-${NGINX_VERSION}.tar.gz
 tar -zxf nginx-${NGINX_VERSION}.tar.gz -C /tmp/nginx --strip-components=1
@@ -62,5 +66,5 @@ cd /tmp/nginx
     --add-module=../nginx-rtmp-module \
     --with-cc-opt="-O3 -Wno-error=implicit-fallthrough"
 
-make -j$(nproc) && make install
+make CC="ccache gcc" -j$(nproc) && make install
 rm -rf /usr/local/nginx/html /usr/local/nginx/conf/*.default