H2O: Reduce the Docker image build time

frameworks/C/h2o/CMakeLists.txt

@@ -19,9 +19,8 @@ find_path(PQ_INCLUDE postgresql/libpq-fe.h REQUIRED)
 find_path(YAJL_INCLUDE yajl/yajl_gen.h REQUIRED)
 find_program(BPFTOOL_BIN bpftool REQUIRED)
 find_program(CLANG_BIN clang REQUIRED)
-include_directories(src ${CMAKE_BINARY_DIR}/generated-headers ${BPF_INCLUDE} ${H2O_INCLUDE})
-include_directories(${MUSTACHE_C_INCLUDE} ${NUMA_INCLUDE} ${OPENSSL_INCLUDE} ${PQ_INCLUDE})
-include_directories(${YAJL_INCLUDE})
+include_directories(src ${CMAKE_BINARY_DIR} ${BPF_INCLUDE} ${H2O_INCLUDE} ${MUSTACHE_C_INCLUDE})
+include_directories(${NUMA_INCLUDE} ${OPENSSL_INCLUDE} ${PQ_INCLUDE} ${YAJL_INCLUDE})
 set(CMAKE_C_STANDARD 11)
 set(CMAKE_C_STANDARD_REQUIRED ON)
 add_compile_definitions(H2O_USE_LIBUV=0)
@@ -32,7 +31,7 @@ set(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} -D_FORTIFY_SOURCE=2")
 set(CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} -O3")
 set(CMAKE_C_FLAGS_RELWITHDEBINFO "${CMAKE_C_FLAGS_RELWITHDEBINFO} -O3")
 add_custom_command(
-  OUTPUT ${CMAKE_BINARY_DIR}/generated-headers/socket_load_balancer.h
+  OUTPUT ${CMAKE_BINARY_DIR}/socket_load_balancer.h
   COMMAND ${CLANG_BIN}
             -c
             -DNDEBUG
@@ -47,12 +46,12 @@ add_custom_command(
             ${WARNING_OPTIONS}
             ${CMAKE_CURRENT_SOURCE_DIR}/src/bpf/socket_load_balancer.c
   COMMAND ${BPFTOOL_BIN} gen skeleton ${CMAKE_BINARY_DIR}/socket_load_balancer.o >
-            ${CMAKE_BINARY_DIR}/generated-headers/socket_load_balancer.h
+            ${CMAKE_BINARY_DIR}/socket_load_balancer.h
   DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/src/bpf/socket_load_balancer.c
   VERBATIM)
 add_custom_target(
   generated_headers
-  DEPENDS ${CMAKE_BINARY_DIR}/generated-headers/socket_load_balancer.h)
+  DEPENDS ${CMAKE_BINARY_DIR}/socket_load_balancer.h)
 file(GLOB_RECURSE HANDLER_SOURCES "src/handlers/*.c")
 file(GLOB SOURCES "src/*.c")
 add_executable(${PROJECT_NAME} ${HANDLER_SOURCES} ${SOURCES})

frameworks/C/h2o/h2o.dockerfile

@@ -2,7 +2,7 @@ ARG UBUNTU_VERSION=25.10
 
 ARG H2O_APP_PREFIX=/opt/h2o-app
 
-FROM "ubuntu:${UBUNTU_VERSION}" AS compile
+FROM "buildpack-deps:${UBUNTU_VERSION}" AS compile
 
 RUN echo "[timing] Installing system packages: $(date)"
 ARG DEBIAN_FRONTEND=noninteractive
@@ -24,15 +24,12 @@ RUN apt-get install \
       libnuma-dev \
       libpq-dev \
       libssl-dev \
-      libstdc++-15-dev \
       libtool \
       liburing-dev \
       libuv1-dev \
-      libwslay-dev \
       libyajl-dev \
       libz-dev \
       make \
-      ninja-build \
       pkg-config \
       ruby \
       systemtap-sdt-dev
@@ -47,7 +44,6 @@ RUN curl -LSs "https://github.com/h2o/h2o/archive/${H2O_VERSION}.tar.gz" | \
       -B build \
       -DCMAKE_C_FLAGS="-flto=auto -march=native -mtune=native" \
       -DWITH_MRUBY=on \
-      -G Ninja \
       -S . && \
     cmake --build build -j && \
     cmake --install build
@@ -72,7 +68,6 @@ RUN cmake \
       -DCMAKE_BUILD_TYPE=Release \
       -DCMAKE_C_FLAGS="-march=native -mtune=native" \
       -DCMAKE_INSTALL_PREFIX="${H2O_APP_PREFIX}" \
-      -G Ninja \
       -S .. && \
     cmake --build . -j && \
     cmake --install .