OpenWrt学习(一)----Makefile-编译动态库

#################################################################################
# VlinkOS Makefile for blue-apply program                                        #
#                                                                                #
# Most of the variables used here are defined in the include directives below.    #
# We just need to specify a basic description of the package,                    #
# where to build our program, where to find the source files,                     #
# and where to install the compiled program on the device.                        #
#                                                                                #
# Be very careful of spacing in this file.                                        #
# Indents should be tabs, not spaces,                                            #
# and there should be no trailing whitespace in lines that are not commented.    #
#################################################################################
 
include $(TOPDIR)/rules.mk

#################################################################################  
# Name, version and release number                                                #
# The name and version of your package are used to define the variable to point    #
# to the build directory of your package: $(PKG_BUILD_DIR)                        #
#################################################################################

PKG_NAME:=libCodec
PKG_VERSION:=1.0
PKG_RELEASE:=1

#################################################################################
# Source settings (i.e. where to find the source codes)                            #
# This is a custom variable, used below                                            #
#################################################################################

SOURCE_DIR:=./src

include $(INCLUDE_DIR)/package.mk
 
#################################################################################
# Package definition; instructs on how and where our package will appear        #
# in the overall configuration menu ('make menuconfig')                            #
#################################################################################

define Package/libCodec
    SECTION:=utils
    CATEGORY:=Utilities
    TITLE:=libCodec -- The libCodec for the code to encode or decode
endef

#################################################################################
# Package description; a more verbose description on what our package does.        #
#################################################################################

define Package/libCodec/description
        The libCodec for the code to encode or decode.
endef

#################################################################################
# Package preparation instructions; create the build directory                    #
# and copy the source code.                                                     #
# The last command is necessary to ensure our preparation instructions            #
# remain compatible with the patching system.                                    #
#################################################################################
 
define Build/Prepare
    mkdir -p $(PKG_BUILD_DIR)
    $(CP) $(SOURCE_DIR)/* $(PKG_BUILD_DIR)
    $(Build/Patch)
endef

#################################################################################
# Package build instructions; invoke the target-specific compiler to first        #
# compile the source file, and then to link the file into the final executable    #
# We do not need to define Build/Configure or Build/Compile directives          #
# The defaults are appropriate for compiling a simple program such as this one    #
#################################################################################
#define Build/Compile
#        $(TARGET_CC) $(TARGET_CFLAGS) -o $(PKG_BUILD_DIR)/helloworld.o -c $(PKG_BUILD_DIR)/helloworld.c
#        $(TARGET_CC) $(TARGET_LDFLAGS) -o $(PKG_BUILD_DIR)/$1 $(PKG_BUILD_DIR)/helloworld.o
#endef
 

define Build/InstallDev
    $(INSTALL_DIR) $(1)/usr/lib $(1)/usr/include
    $(CP) $(PKG_BUILD_DIR)/*.h $(1)/usr/include/
    $(CP) $(PKG_BUILD_DIR)/libCodec.so $(1)/usr/lib/
endef  
 
 
#################################################################################
# Specify where and how to install the program. Since we only have one file,      #
# the helloworld executable, install it by copying it to the /bin directory on    #
# the device. The $(1) variable represents the root directory on the device        #
# running VlinkOS. The $(INSTALL_DIR) variable contains a command to prepare    #
# the install directory if it does not already exist.  Likewise $(INSTALL_BIN)    #
# contains the command to copy the binary file from its current location        #
# (in our case the build directory) to the install directory.                      #
#################################################################################

define Package/libCodec/install
    $(INSTALL_DIR) $(1)/usr/lib
    $(INSTALL_BIN) $(PKG_BUILD_DIR)/libCodec.so $(1)/usr/lib/
endef
 
#################################################################################
# This line executes the necessary commands to compile our program.              #
# The above define directives specify all the information needed, but this      #
# line calls BuildPackage which in turn actually uses this information to          #
# build a package.                                                              #
#################################################################################

$(eval $(call BuildPackage,libCodec))