android 动态库编译c yocto编译动态库

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编程小匠人之魂 2023-08-01 14:21:39

文章标签 android 动态库编译c yocto sdk so 动态库 文章分类 Android 移动开发

yocto有现成的sdk配方指令，例如

bitbake xxxx-image -c populate_sdk

可生成系统默认存在的开发工具，如果想加入自定义的动态库可用如下方法

在系统中加入版本号接口，本地编写代码并确定能编译成动态库，生成动态库的makefile如下

SOURCES = fubversion.cpp
OBJS = $(patsubst %.cpp, %.o, $(SOURCES))

CFLAGS := -Wall -O3 -std=c++0x
# INC_PATH =
# LIB_PATH =

LIB = libfubversion.so

all: $(LIB)

$(OBJS): $(SOURCES)
	$(CXX) $(CFLAGS) -fpic -c $< -o $@ $(INC_PATH) $(LIB_PATH)

$(LIB): $(OBJS)
	rm -f $@ 
	$(CXX) -shared -o $@ $(OBJS) 
	rm -f $(OBJS)

tags:
	ctags -R * 

clean: 
	rm -f $(OBJS) $(TARGET) $(LIB)

然后将其放入yocto系统里，按照如下方法写bb文件，此文件调试后未整理，可能存在冗余

DESCRIPTION = "fub version library"

LICENSE = "MIT"
LIC_FILES_CHKSUM = "file://${COMMON_LICENSE_DIR}/MIT;md5=0835ade698e0bcf8506ecda2f7b4f302"
PR = "1"

SRC_URI = "file://source-code \
                file://patch \
                file://source-code/libfubversion.so"

# DEPENDS = "glib-2.0"

S = "${WORKDIR}/source-code/"

do_compile() {
        make
}

do_install() {
        install -d ${D}/usr/lib
        cp ${WORKDIR}/source-code/libfubversion.so ${WORKDIR}/source-code/libfubversion.so.${PR}
        install -m 0755 ${WORKDIR}/source-code/libfubversion.so.${PR} ${D}/usr/lib
        install -m 0755 ${WORKDIR}/source-code/libfubversion.so ${D}/usr/lib
        cd ${D}/usr/lib/
        ln -sf libfubversion.so.${PR} libfubversion.so
        install -d ${D}/usr/include
        install -m 0644 ${WORKDIR}/source-code/fubversion.h ${D}/usr/include/
}

INHIBIT_PACKAGE_STRIP = "1"
FILES_${PN} += "${libdir}/*.so"
FILES_${PN}-dbg += "${libdir}/.debug"
FILES_SOLIBSDEV = ""
INSANE_SKIP_${PN} = "dev-so"
BBCLASSEXTEND = "native nativesdk"

此处有几个关键的字段

该字段可将相关动态库生成到sdk中

BBCLASSEXTEND = "native nativesdk"

在SDK里还需要一个头文件，此处的头文件的安装不规范，但可以使用

到此，将一个包含自定义的动态库生成到sdk已经完成了，但动态库需要同时放到文件系统中，编译系统指令，如

bitbake xxxx-image

将动态库编译到文件系统规则多一些，如

其中.so为链接文件不可少，否者会提示链接文件缺失，大概如下一类错误

QA Issue: non -dev/-dbg/-nativesdk package contains symlink .so
QA Issue: -dev package contains non-symlink .so

在do_instll制作.so链接文件和对应的动态库后，不会自动将链接文件和动态库一并生成到文件系统里

在fubversion配方的image文件夹里是存在.so和动态链接文件的，但是在最终的文件系统却没有.so链接文件

这与do_package_qa一类的规则有关，解决办法

FILES_${PN} += "${libdir}/*.so"
FILES_${PN}-dbg += "${libdir}/.debug"
FILES_SOLIBSDEV = ""
INSANE_SKIP_${PN} = "dev-so"

此时才会将.so链接文件和对应的动态链接库都安装到文件系统里

上边说的头文件的问题在这里也有，就是会将头文件也安装到文件系统里，这是不需要的，以后在加入sdk头文件的安装方法

文件系统完成，系统的镜像也同步好了，测试验证

写一个测试app，makefile，读取版本号

makefile

# INCLUDE = -I $(SDK_ROOT_DIR)/usr/include
LIBS = -lversion

LDFLAGS += $(LIBS)
CPPFLAGS += $(INCLUDE)

TARGET = app_get_version
TARGET_DIR = .

SOURCES = app.cpp

OBJ_FILES = $(patsubst %.cpp, %.o, $(SOURCES))

all: check_env compile link

check_env:
	@echo "[$(TARGET)]: Build Start..."
	@mkdir -p $(TARGET_DIR)
	@echo ${CXX}

compile: $(OBJ_FILES)

link:
	@echo "[$(TARGET)]: Linking ..."
	@$(CXX) $(OBJ_FILES) $(LDFLAGS) -o $(TARGET_DIR)/$(TARGET)
	rm -f $(OBJ_FILES)
	@echo "[$(TARGET)]: Build done!"	

#complie step 1:
$(OBJ_FILES): %.o: %.cpp
	@echo "[$(TARGET)]: Compiling  $(notdir $^) ..."
	@$(CXX) -c $(CPPFLAGS) $< -o $@

clean:
	@rm -rf $(OBJ_FILES) $(TARGET_DIR)/$(TARGET)
	@echo "[$(TARGET)]: Clean Finish!"

应用程序就无需关心版本号的管理怎么实现的，通过非常简单的sdk接口获得版本号达到目的

#include <fubversion.h>
#include <iostream>
#include <string>

int main ()
{
	std::string sVerBuff;
	sVerBuff.clear();
	sVerBuff = VersionInfo::GetInstance()->GetVersionInfo("ro.build.fub.version");
	printf ("%s \n", sVerBuff.c_str());
	return 0;
}

在更新的yocto中又遇到了如下问题

do_package_qa: QA Issue: No GNU_HASH in the elf binary: '/home/qiuhui/imx8_4.16/build-mek/tmp/work/aarch64-poky-linux/fubversion/0.1-1/packages-split/fubversion/usr/lib/libfubversion.so.1' [ldflags]

可加入如下命令解决

TARGET_CC_ARCH += "${LDFLAGS}"

同时还查到如下命令，此命令未验证
ERROR_QA_remove = "ldflags"

在做另一个limessage.so的时候又遇到了另一个问题

ERROR: nativesdk-libmessage-0.1-1 do_package: QA Issue: nativesdk-libmessage: Files/directories were installed but not shipped in any package:
  /usr
  /usr/include
  /usr/lib
  /usr/include/manager.h
  /usr/include/GDef.h
  /usr/include/message.h
  /usr/include/uart.h
  /usr/include/EventCenter.h
  /usr/include/TimerControl.h
  /usr/include/Timer.h
  /usr/lib/libfubversion.so
  /usr/lib/libmessage.so.1
  /usr/lib/libmessage.so
Please set FILES such that these items are packaged. Alternatively if they are unneeded, avoid installing them or delete them within do_install.
nativesdk-libmessage: 13 installed and not shipped files. [installed-vs-shipped]
ERROR: nativesdk-libmessage-0.1-1 do_package: Fatal QA errors found, failing task.
ERROR: nativesdk-libmessage-0.1-1 do_package: Function failed: do_package
ERROR: Logfile of failure stored in: /home/timotheus/ext_sdb/hm02/krogoth/build-wayland-e115-arhud/tmp/work/x86_64-nativesdk-pokysdk-linux/nativesdk-libmessage/0.1-1/temp/log.do_package.12245
ERROR: Task 11 (virtual:nativesdk:/home/timotheus/ext_sdb/hm02/krogoth/sources/meta-autofuture/recipes-autofuture/application/libmessage_0.1.bb, do_package) failed with exit code '1'

加入
INSANE_SKIP_${PN} += "installed-vs-shipped"

如果是想编译到文件系统而非SDK的话则在以上基础去掉,不然单独编译通过但编译镜像的时候无法通过