OpenWrt Add Package

variable name meaning

Section     //package Type
category    //display in Menuconfig which directory
submenu     //menuconfig subdirectory
TITLE       // Simple introduction
DESCRIPTION//package details URL/
/         Source of the network path maintainer//  maintainer
DEPENDS     //Dependency Package

Pkg_name        //package name, the
version number of pkg_version//     software version number
Pkg_release     //makefile will be visible in Menuconfig and ipkg
Pkg_source      //source code of the file name
pkg_md5sum      //source code file validation code. Used to check if the package is properly downloaded
pkg_cat/         /Source code file decompression method (Zcat, Bzcat, unzip)
Pkg_build_dir   //package compilation directory. Its parent directory is $ (build_dir). If not specified, the default is $ (build_dir)/$ (pkg_name) $ (pkg_version)

Package

Define package/$ (pkg_name)
    section:=utils
    category:=utilities
    title:=helloworld--Prints a snarky Message
Endef

Build/prepare
The compilation preparation method. All of your programs are placed in the SRC directory. General methods of Preparation:

Define Build/prepare
    Mkdir-p $ (pkg_build_dir)
    $ (CP)./src/* $ (pkg_build_dir)/
Endef

Build/compile
The compilation method. If not defined, the default compilation method Build/compile/default will be used. General method of Definition:

Define Build/compile
    $ (make)-C $ (pkg_build_dir) \
        $ (target_configure_opts) cflags= "$ (target_cflags)-i$ ( Linux_dir)/include "
endef

package/$ (pkg_name)/install
Installation method. Example:

Define package/$ (Pkg_name)/install
    $ (install_dir) $ (1)/etc/init.d/
    $ (install_bin) $ (pkg_build_dir)/hello $ (1)/etc/init.d/
    $ (install_data) $ (pkg_build_dir)/configs/hello.config $ (1)/etc/
    $ (install_conf) $ (PKG_ Build_dir)/configs/hello.config $ (1)/etc/
#   $ (CP) $ (pkg_build_dir)/tools/{xxx} $ (1)/usr/sbin///default permissions, And just a simple copy of
endef.

Install_xxx: Install to Pkg_build_dir and file system directory
CP: Only installed in the Pkg_build_dir directory

The INSTALL_XXX variable is defined in the $ (topdir)/rules.mk

install_bin:=install-m0755
install_dir:=install-d-m0755
install_data:=install-m0644
INSTALL_CONF:= install-m0600

Eval

$ (eval <text>)

Use text as part of the makefile file

Pager

$ (call buildpackage,$ (Pkg_name))

Reference the contents of the Buildpackage variable and replace the Buildpackage internal $ (1) with Pkg_name

Buildpackage
The buildpackage variable is defined in the $ (include_dir)/package.mk

Define Buildpackage
  $ (build/includeoverlay) $ (
  eval $ (package/default))
  $ (eval $ (package/$ (1)))

ifdef DESCRIPTION
$$ (Error description:= is obsolete, use package/pkg_name/description)
endif

ifndef package/$ (1)/description
define package/$ (1)/description
    $ (TITLE)
endef
endif

  $ (foreach FIELD, TITLE CATEGORY priority sections VERSION,
    ifeq ($ (FIELD)),
      $$ (Error package/$ (1) is missing the $ (FIEL D) field)
    endif
  )

  $ (call shexport,package/$ (1)/description)
  $ (call shexport,package/$ (1)/ Config)

  $ (if $ (DUMP), \
    $ (dumpinfo/package), \
    $ (foreach target, \
      $ (if $ (package/$ (1)/targets), $ (package/$ (1)/targets), \
        $ (if $ (pkg_targets), $ (pkg_targets), ipkg) \
      ), $ (buildtarget/$ (target)) \
    ) \
  )
  $ (if $ (pkg_host_only) $ (DUMP), $ (call build/defaulttargets,$ (1)))
Endef

the correct compilation process

# make Menuconfig
# make-j   //Automatically select the number of CPUs, general compilation will be wrong
# making
# making package/$ (Pkg_name)/install

You must make a success before you can execute the install, otherwise you will be prompted to rely on library warnings

Note
If you add a package that needs to be cross-compiled, remember to set the cross compiler in CMakeLists.txt

SET (Cmake_c_compiler "MIPSEL-OPENWRT-LINUX-UCLIBC-GCC")