Linux系统编译（yocto）

1. Makefile编写

　　makefile如下所示，编译生成静态库；

　　$^: 表示所有的.o文件

　　$@: 表示目标文件

CROSS =   
CC = $(CROSS)arm-linux-gnueabi-gcc 
CXX = $(CROSS)arm-linux-gnueabi-g++  
DEBUG = -g
CFLAGS = $(DEBUG) -Wall -c -fPIC -pthread -mfloat-abi=hard
MV = mv -f  
RM = rm -rf  
LN = ln -sf  

TARGET = RTK

TOP_PATH = $(shell pwd)

INC_PATH = $(TOP_PATH)

SRC_PATH += $(TOP_PATH)
SRC_PATH += $(TOP_PATH)/gsl
SRC_PATH += $(TOP_PATH)/BASEDLL
SRC_PATH += $(TOP_PATH)/GNSSDLL
SRC_PATH += $(TOP_PATH)/RTIEDLL

DIRS = $(shell find $(SRC_PATH))
FILES = $(foreach dir, $(DIRS), $(wildcard $(dir)/*.cpp))

BUILD_DIR = $(TOP_PATH)/build
##########################################################  
# modules  
##########################################################  
 

##########################################################  
# srcs  
##########################################################  
SRCS_CPP += $(foreach dir, $(DIRS), $(wildcard $(dir)/*.cpp))  
SRCS_CC += $(foreach dir, $(DIRS), $(wildcard $(dir)/*.cc))  
SRCS_C += $(foreach dir, $(DIRS), $(wildcard $(dir)/*.c))  

##########################################################  
# objs  
##########################################################  
OBJS_CPP = $(patsubst %.cpp, %.o, $(SRCS_CPP))  
OBJS_CC = $(patsubst %.cc, %.o, $(SRCS_CC))  
OBJS_C = $(patsubst %.c, %.o, $(SRCS_C))  

##########################################################  
# paths
##########################################################  


##########################################################  
# libs
##########################################################  

##########################################################  
# building
##########################################################  
all:$(TARGET)

$(TARGET) : $(OBJS_CPP) $(OBJS_CC) $(OBJS_C)  
    
    #$(CXX) -shared -fpic $^ -o lib.so
    ar -crv libRTK.a $^ 

$(OBJS_CPP):%.o : %.cpp
    $(CXX) $(CFLAGS) $< -o $@ -I$(INC_PATH)

$(OBJS_CC):%.o : %.cc
    $(CXX) $(CFLAGS) $< -o $@ -I$(INC_PATH)

$(OBJS_C):%.o : %.c
    $(CXX) $(CFLAGS) $< -o $@ -I$(INC_PATH)

$(OBJS_C):%.o : %.c
    $(CC) $(CFLAGS) $< -o $@ -I$(INC_PATH)



.PHONY : clean  
clean:  
    @ $(RM) $(TARGET) $(OBJS_CPP) $(OBJS_CC) $(OBJS_C)
    

2. yocto的.bb文件包含静态库

DESCRIPTION = "A simple UART test application"
SECTION = "extras"
LICENSE = "GPLv2+ & LGPLv2.1+"
PR = "r0"
LIC_FILES_CHKSUM = "file://${COREBASE}/meta/files/common-licenses/GPL-2.0;md5=801f80980d171dd6425610833a22dbe6"

inherit externalsrc

EXTERNALSRC_pn-uart-test ?= "${ST_LOCAL_SRC}carproc-app/uart-test"

FILES_${PN} = "${bindir}/uart-test"

do_compile() {


    ${CXX} ${CXXFLAGS} ${LDFLAGS} -pthread ${S}/uart_test.cpp ${ST_LOCAL_SRC}carproc-app/uart-test/lib/libRTK.a -o uart-test -I ${ST_LOCAL_SRC}carproc-app/uart-test
}

do_install_append() {
    install -d ${D}${bindir}
    install -m 0755 ${B}/uart-test ${D}${bindir}
}

Makefile编译要跟yocto一致使用交叉编译，编译选项尽可能一致