GNU C 库提供了 iconv 的实现——我该如何使用它？
简单的程序：
#include <iconv.h>
int main( int argc, char **argv ) {
iconv_t cd = iconv_open( "UTF-8", "ISO-8859-1" );
iconv_close( cd );
return 0;
}
编译和链接：
$ gcc -Wall iconv.c -o iconv
/tmp/ccKAfXNg.o: In function `main':
iconv.c:(.text+0x19): undefined reference to `libiconv_open'
iconv.c:(.text+0x29): undefined reference to `libiconv_close'
collect2: ld returned 1 exit status
列出符号以表明它们存在！
$ nm -D /lib/libc-2.12.1.so | grep iconv
00017920 T iconv
00017ae0 T iconv_close
00017720 T iconv_open
如果我将 GNU libiconv 库安装到 /usr/local 并与 -liconv 链接，它就可以工作。如何与 iconv 的 glibc 实现链接？
编辑：根据评论要求提供更多信息：
列出 /usr 中的所有 iconv.h 文件（1 个匹配项）
$ find /usr/ | grep "iconv\.h"
/usr/include/iconv.h
重新安装 libc6-dev 以确保安装了正确的标头。
$ dpkg -S /usr/include/iconv.h
libc6-dev: /usr/include/iconv.h
$ apt-get install --reinstall libc6-dev
Reading package lists... Done
Building dependency tree
Reading state information... Done
0 upgraded, 0 newly installed, 1 reinstalled, 0 to remove and 0 not upgraded.
Need to get 0B/4,910kB of archives.
After this operation, 0B of additional disk space will be used.
(Reading database ... 143458 files and directories currently installed.)
Preparing to replace libc6-dev 2.12.1-0ubuntu10.1 (using .../libc6-dev_2.12.1-0ubuntu10.1_i386.deb) ...
Unpacking replacement libc6-dev ...
Setting up libc6-dev (2.12.1-0ubuntu10.1) ...
使用建议的预处理器选项再次编译和链接：
$ gcc -Wall -DLIBICONV_PLUG iconv.c -o iconv
/tmp/ccKAfXNg.o: In function `main':
iconv.c:(.text+0x19): undefined reference to `libiconv_open'
iconv.c:(.text+0x29): undefined reference to `libiconv_close'
collect2: ld returned 1 exit status
gcc -H 的输出：
$ gcc -H iconv.c
. /usr/include/iconv.h
.. /usr/include/features.h
... /usr/include/bits/predefs.h
... /usr/include/sys/cdefs.h
.... /usr/include/bits/wordsize.h
... /usr/include/gnu/stubs.h
.... /usr/include/bits/wordsize.h
.... /usr/include/gnu/stubs-32.h
.. /usr/lib/gcc/i686-linux-gnu/4.4.5/include/stddef.h
Multiple include guards may be useful for:
/usr/include/bits/predefs.h
/usr/include/gnu/stubs-32.h
/usr/include/gnu/stubs.h
/usr/lib/gcc/i686-linux-gnu/4.4.5/include/stddef.h
已修复：重新启动修复了该问题。我怀疑 libiconv 的缓存副本导致了冲突，即使它已从磁盘中删除。