Question

我正试图在Eclipse Juno的Linux下用C构建一个小项目。由于我包含了libcurl库，我认为链接器始终会发生错误，无法找到-lcurl。我知道互联网上有几个帖子，但没有什么真正有用。整体看起来像这样：

Building target: c_template
Invoking: GCC C Linker
/usr/local/oecore-i686-arm/sysroots/i686-oesdk-linux/usr/bin/armv7a-vfp-neon-oe-linux-gnueabi/arm-oe-linux-gnueabi-gcc -L/usr/lib --sysroot=/usr/local/oecore-i686-arm/sysroots/armv7a-vfp-neon-oe-linux-gnueabi -o  "c_template"  ./src/atCommand.o ./src/charDevice.o ./src/curl.o ./src/debug.o ./src/linux_prototype.o ./src/output.o ./src/simStatus.o ./src/urc.o ./src/wwan.o   -lpthread -lcurl
                 from <command-line>:0:
/home/ubuntu/Documents/eCall/hwell_06/workspace_hwell_06/c_template/inc/defs.h:87:10: warning: type defaults to 'int' in declaration of 'BOOL' [-Wimplicit-int]
/home/ubuntu/Documents/eCall/hwell_06/workspace_hwell_06/c_template/inc/atCommand.h:56:12: warning: 'atCommandsHandler' defined but not used [-Wunused-variable]
/home/ubuntu/Documents/eCall/hwell_06/workspace_hwell_06/c_template/inc/debug.h:60:12: warning: 'deviceHandler' defined but not used [-Wunused-variable]
/usr/local/oecore-i686-arm/sysroots/i686-oesdk-linux/usr/libexec/armv7a-vfp-neon-oe-linux-gnueabi/gcc/arm-oe-linux-gnueabi/4.6.3/ld: warning: skipping incompatible /usr/lib/libpthread.so while searching for pthread
/usr/local/oecore-i686-arm/sysroots/i686-oesdk-linux/usr/libexec/armv7a-vfp-neon-oe-linux-gnueabi/gcc/arm-oe-linux-gnueabi/4.6.3/ld: warning: skipping incompatible /usr/lib/libcurl.so while searching for curl
/usr/local/oecore-i686-arm/sysroots/i686-oesdk-linux/usr/libexec/armv7a-vfp-neon-oe-linux-gnueabi/gcc/arm-oe-linux-gnueabi/4.6.3/ld: error: cannot find -lcurl
/usr/local/oecore-i686-arm/sysroots/i686-oesdk-linux/usr/libexec/armv7a-vfp-neon-oe-linux-gnueabi/gcc/arm-oe-linux-gnueabi/4.6.3/ld: warning: skipping incompatible /usr/lib/libc.so while searching for c
../src/curl.c:66: error: undefined reference to 'curl_global_init'
../src/curl.c:69: error: undefined reference to 'curl_easy_init'
../src/curl.c:72: error: undefined reference to 'curl_slist_append'
../src/curl.c:73: error: undefined reference to 'curl_slist_append'
../src/curl.c:76: error: undefined reference to 'curl_easy_setopt'
../src/curl.c:79: error: undefined reference to 'curl_easy_setopt'
../src/curl.c:82: error: undefined reference to 'curl_easy_setopt'
../src/curl.c:85: error: undefined reference to 'curl_easy_setopt'
../src/curl.c:98: error: undefined reference to 'curl_easy_perform'
../src/curl.c:101: error: undefined reference to 'curl_easy_strerror'
../src/curl.c:105: error: undefined reference to 'curl_slist_free_all'
../src/curl.c:108: error: undefined reference to 'curl_easy_cleanup'
../src/curl.c:112: error: undefined reference to 'curl_global_cleanup'
collect2: ld returned 1 exit status
make: *** [c_template] Error 1

我已经为链接器设置了库的路径：对于库搜索路径（-L）：/ usr / lib 和库（-l）：curl

我的命令行模式如下所示：

$ {COMMAND} $ {FLAGS} $ {OUTPUT_FLAG} $ {OUTPUT_PREFIX} $ {OUTPUT} $ {INPUTS}

任何人都可以帮助我。会很棒。

非常感谢

Answer 1

您正在为ARM交叉编译c_template，因此您需要在交叉编译环境中为ARM安装libcurl。现在它找到了你的i686主机的libcurl，它不能使用它，如下所示：

/usr/local/oecore-i686-arm/sysroots/i686-oesdk-linux/usr/libexec/armv7a-vfp-neon-oe-linux-gnueabi/gcc/arm-oe-linux-gnueabi/4.6.3/ld: warning: skipping incompatible /usr/lib/libcurl.so while searching for curl

首先在编译环境中为目标平台编译/安装libcurl，并确保编译器能够找到它。

使用libcurl构建项目并不能在linux下工作

1 个答案: