無法在C ++上為OpenWrt編譯軟件包Helloworld

Question

我正在嘗試為OpenWrt編譯簡單的helloworld程序（使用構建系統，分支17.01.6）。 我使用了兩個教程： 官方網站上的helloworld教程和Eric Bishop編寫的C ++第2部分。

但是在編譯helloworld-package期間出現錯誤： Package helloworld is missing dependencies for the following libraries: libc.so.6

文件結構：
。
├--openwrt_17_01
├--source＃源目錄，構建系統
├--helloworld#helloworld項目
| └--src
| ├--helloworld.cpp
| └--Makefile＃C ++項目Makefile
└--mypackages
└--例子
└--helloworld
└--Makefile#package制作文件

openwrt_17_01 / helloworld / src / helloworld.cpp：

#include "stdio.h"
int main()
{
    printf("Hello, world! (C++)\n\n");
    return 0;
}

openwrt_17_01 / helloworld / src / Makefile：

helloworld: helloworld.o
    $(CXX) $(LDFLAGS) helloworld.o -o helloworld $(LIBS)
helloworld.o: helloworld.cpp
    $(CXX) $(CXXFLAGS) -c helloworld.cpp
clean:
    rm *.o helloworld

mypackages / examples / helloworld / Makefile：

include $(TOPDIR)/rules.mk

PKG_NAME:=helloworld
PKG_VERSION:=1.0
PKG_RELEASE:=1

SOURCE_DIR:=/home/mzhi/proj_src/openwrt_17_01/helloworld
PKG_BUILD_DIR:=$(BUILD_DIR)/$(PKG_NAME)

include $(INCLUDE_DIR)/package.mk

define Package/helloworld
    SECTION:=examples
    DEPENDS:= +libstdcpp +libc
    CATEGORY:=Examples
    TITLE:=Hello, World!
endef

define Package/helloworld/description
    A simple "Hello, world!" -application.
endef

define Build/Prepare
    mkdir -p $(PKG_BUILD_DIR)
    $(CP) $(SOURCE_DIR)/src/* $(PKG_BUILD_DIR)/
endef

define Build/Compile
    $(MAKE) -C $(PKG_BUILD_DIR) \
    LIBS="-nodefaultlibs -lgcc -lc -luClibc++" \
    LDFLAGS="$(EXTRA_LDFLAGS)" \
    CXXFLAGS="$(TARGET_CFLAGS) $(EXTRA_CPPFLAGS) -nostdinc++" \
    $(TARGET_CONFIGURE_OPTS) \
    CROSS="$(TARGET_CROSS)" \
    ARCH="$(ARCH)" \
    $(1);
endef

define Package/helloworld/install
    $(INSTALL_DIR) $(1)/usr/bin
    $(INSTALL_BIN) $(PKG_BUILD_DIR)/helloworld $(1)/usr/bin
endef

$(eval $(call BuildPackage,helloworld))

編譯的完整輸出（make package / helloworld / compile -j1 V = s）：

make[1]: Entering directory 
'/home/mzhi/proj_src/openwrt_17_01/openwrt'
make[2]: Entering directory 
'/home/mzhi/proj_src/openwrt_17_01/openwrt/package/libs/toolchain'
if [ -f /home/mzhi/proj_src/openwrt_17_01/openwrt/staging_dir/target- mipsel_24kc_musl-1.1.16/pkginfo/toolchain.default.install.clean ]; then rm -f /home/mzhi/proj_src/openwrt_17_01/openwrt/staging_dir/target-mipsel_24kc_musl-1.1.16/pkginfo/toolchain.default.install /home/mzhi/proj_src/openwrt_17_01/openwrt/staging_dir/target-mipsel_24kc_musl-1.1.16/pkginfo/toolchain.default.install.clean; fi
echo "libc" >> 
/home/mzhi/proj_src/openwrt_17_01/openwrt/staging_dir/target-mipsel_24kc_musl-1.1.16/pkginfo/toolchain.default.install
if [ -f /home/mzhi/proj_src/openwrt_17_01/openwrt/staging_dir/target-mipsel_24kc_musl-1.1.16/pkginfo/toolchain.default.install.clean ]; then rm -f /home/mzhi/proj_src/openwrt_17_01/openwrt/staging_dir/target-mipsel_24kc_musl-1.1.16/pkginfo/toolchain.default.install /home/mzhi/proj_src/openwrt_17_01/openwrt/staging_dir/target-mipsel_24kc_musl-1.1.16/pkginfo/toolchain.default.install.clean; fi
echo "libgcc" >> 
/home/mzhi/proj_src/openwrt_17_01/openwrt/staging_dir/target-mipsel_24kc_musl-1.1.16/pkginfo/toolchain.default.install
if [ -f /home/mzhi/proj_src/openwrt_17_01/openwrt/staging_dir/target-mipsel_24kc_musl-1.1.16/pkginfo/toolchain.default.install.clean ]; then rm -f /home/mzhi/proj_src/openwrt_17_01/openwrt/staging_dir/target-mipsel_24kc_musl-1.1.16/pkginfo/toolchain.default.install /home/mzhi/proj_src/openwrt_17_01/openwrt/staging_dir/target-mipsel_24kc_musl-1.1.16/pkginfo/toolchain.default.install.clean; fi
if [ -f /home/mzhi/proj_src/openwrt_17_01/openwrt/staging_dir/target-mipsel_24kc_musl-1.1.16/pkginfo/toolchain.default.install.clean ]; then rm -f /home/mzhi/proj_src/openwrt_17_01/openwrt/staging_dir/target-mipsel_24kc_musl-1.1.16/pkginfo/toolchain.default.install /home/mzhi/proj_src/openwrt_17_01/openwrt/staging_dir/target-mipsel_24kc_musl-1.1.16/pkginfo/toolchain.default.install.clean; fi
if [ -f /home/mzhi/proj_src/openwrt_17_01/openwrt/staging_dir/target-mipsel_24kc_musl-1.1.16/pkginfo/toolchain.default.install.clean ]; then rm -f /home/mzhi/proj_src/openwrt_17_01/openwrt/staging_dir/target-mipsel_24kc_musl-1.1.16/pkginfo/toolchain.default.install /home/mzhi/proj_src/openwrt_17_01/openwrt/staging_dir/target-mipsel_24kc_musl-1.1.16/pkginfo/toolchain.default.install.clean; fi
echo "libstdcpp" >> 
/home/mzhi/proj_src/openwrt_17_01/openwrt/staging_dir/target-mipsel_24kc_musl-1.1.16/pkginfo/toolchain.default.install
if [ -f /home/mzhi/proj_src/openwrt_17_01/openwrt/staging_dir/target-mipsel_24kc_musl-1.1.16/pkginfo/toolchain.default.install.clean ]; then rm -f /home/mzhi/proj_src/openwrt_17_01/openwrt/staging_dir/target-mipsel_24kc_musl-1.1.16/pkginfo/toolchain.default.install /home/mzhi/proj_src/openwrt_17_01/openwrt/staging_dir/target-mipsel_24kc_musl-1.1.16/pkginfo/toolchain.default.install.clean; fi
echo "libpthread" >> 
/home/mzhi/proj_src/openwrt_17_01/openwrt/staging_dir/target-mipsel_24kc_musl-1.1.16/pkginfo/toolchain.default.install
if [ -f /home/mzhi/proj_src/openwrt_17_01/openwrt/staging_dir/target-mipsel_24kc_musl-1.1.16/pkginfo/toolchain.default.install.clean ]; then rm -f /home/mzhi/proj_src/openwrt_17_01/openwrt/staging_dir/target-mipsel_24kc_musl-1.1.16/pkginfo/toolchain.default.install /home/mzhi/proj_src/openwrt_17_01/openwrt/staging_dir/target-mipsel_24kc_musl-1.1.16/pkginfo/toolchain.default.install.clean; fi
if [ -f /home/mzhi/proj_src/openwrt_17_01/openwrt/staging_dir/target-mipsel_24kc_musl-1.1.16/pkginfo/toolchain.default.install.clean ]; then rm -f /home/mzhi/proj_src/openwrt_17_01/openwrt/staging_dir/target-mipsel_24kc_musl-1.1.16/pkginfo/toolchain.default.install /home/mzhi/proj_src/openwrt_17_01/openwrt/staging_dir/target-mipsel_24kc_musl-1.1.16/pkginfo/toolchain.default.install.clean; fi
echo "librt" >> 
/home/mzhi/proj_src/openwrt_17_01/openwrt/staging_dir/target-mipsel_24kc_musl-1.1.16/pkginfo/toolchain.default.install
if [ -f /home/mzhi/proj_src/openwrt_17_01/openwrt/staging_dir/target-mipsel_24kc_musl-1.1.16/pkginfo/toolchain.default.install.clean ]; then rm -f /home/mzhi/proj_src/openwrt_17_01/openwrt/staging_dir/target-mipsel_24kc_musl-1.1.16/pkginfo/toolchain.default.install /home/mzhi/proj_src/openwrt_17_01/openwrt/staging_dir/target-mipsel_24kc_musl-1.1.16/pkginfo/toolchain.default.install.clean; fi
if [ -f /home/mzhi/proj_src/openwrt_17_01/openwrt/staging_dir/target-mipsel_24kc_musl-1.1.16/pkginfo/toolchain.default.install.clean ]; then rm -f /home/mzhi/proj_src/openwrt_17_01/openwrt/staging_dir/target-mipsel_24kc_musl-1.1.16/pkginfo/toolchain.default.install /home/mzhi/proj_src/openwrt_17_01/openwrt/staging_dir/target-mipsel_24kc_musl-1.1.16/pkginfo/toolchain.default.install.clean; fi
if [ -f /home/mzhi/proj_src/openwrt_17_01/openwrt/staging_dir/target-mipsel_24kc_musl-1.1.16/pkginfo/toolchain.default.install.clean ]; then rm -f /home/mzhi/proj_src/openwrt_17_01/openwrt/staging_dir/target-mipsel_24kc_musl-1.1.16/pkginfo/toolchain.default.install /home/mzhi/proj_src/openwrt_17_01/openwrt/staging_dir/target-mipsel_24kc_musl-1.1.16/pkginfo/toolchain.default.install.clean; fi
make[2]: Leaving directory '/home/mzhi/proj_src/openwrt_17_01/openwrt/package/libs/toolchain'
make[2]: Entering directory '/home/mzhi/proj_src/openwrt_17_01/mypackages/examples/helloworld'
mkdir -p /home/mzhi/proj_src/openwrt_17_01/openwrt/bin/targets/ramips/mt7621/packages /home/mzhi/proj_src/openwrt_17_01/openwrt/build_dir/target-mipsel_24kc_musl-1.1.16/helloworld/ipkg-mipsel_24kc/helloworld/CONTROL /home/mzhi/proj_src/openwrt_17_01/openwrt/staging_dir/target-mipsel_24kc_musl-1.1.16/pkginfo
install -d -m0755 /home/mzhi/proj_src/openwrt_17_01/openwrt/build_dir/target-mipsel_24kc_musl-1.1.16/helloworld/ipkg-mipsel_24kc/helloworld/usr/bin
install -m0755 /home/mzhi/proj_src/openwrt_17_01/openwrt/build_dir/target-mipsel_24kc_musl-1.1.16/helloworld/helloworld /home/mzhi/proj_src/openwrt_17_01/openwrt/build_dir/target-mipsel_24kc_musl-1.1.16/helloworld/ipkg-mipsel_24kc/helloworld/usr/bin
find /home/mzhi/proj_src/openwrt_17_01/openwrt/build_dir/target-mipsel_24kc_musl-1.1.16/helloworld/ipkg-mipsel_24kc/helloworld -name 'CVS' -o -name '.svn' -o -name '.#*' -o -name '*~'| xargs -r rm -rf
Package helloworld is missing dependencies for the following libraries:
libc.so.6
Makefile:65: recipe for target '/home/mzhi/proj_src/openwrt_17_01/openwrt/bin/packages/mipsel_24kc/mypackages/helloworld_1.0-1_mipsel_24kc.ipk' failed
make[2]: *** [/home/mzhi/proj_src/openwrt_17_01/openwrt/bin/packages/mipsel_24kc/mypackages/helloworld_1.0-1_mipsel_24kc.ipk] Error 1
make[2]: Leaving directory '/home/mzhi/proj_src/openwrt_17_01/mypackages/examples/helloworld'
package/Makefile:105: recipe for target 'package/feeds/mypackages/helloworld/compile' failed
make[1]: *** [package/feeds/mypackages/helloworld/compile] Error 2
make[1]: Leaving directory '/home/mzhi/proj_src/openwrt_17_01/openwrt'
/home/mzhi/proj_src/openwrt_17_01/openwrt/include/toplevel.mk:205: recipe for target 'package/helloworld/compile' failed
make: *** [package/helloworld/compile] Error 2

操作系統：ubuntu 16.04
目標系統：聯發科Ralink MIPS
子目標：基於MT7621的板
目標配置文件：Ubiquiti EdgeRouter X

Google搜索了很多，但是我仍然不明白為什么編譯器看不到必要的庫libc.so.6以及如何在Makefile中正確連接它

也許有人已經遇到過類似的問題，請分享解決方案。

Answer 1

將您的Makefile更改為此文件呢？

BINARY  = helloworld$(EXE)

FILES   = helloworld.o

all: $(BINARY)

helloworld$(EXE): $(FILES)
    $(CC) $(FILES) -o $(@)

clean:
    rm -f $(FILES) *.o

和此代碼：

#include <stdio.h>
int main()
{
    printf("Hello, world! (C++)\n\n");
    return 0;
}

Answer 2

您想要的答案在這里： https : //fleshandmachines.wordpress.com/2011/08/22/openwrt-cc-programing/

您必須將$(CC) $(CXX) $(CC)更改為$(CXXFLAGS) $(CFLAGS) $(CXXFLAGS)