无法使用MinGW链接libpcrecpp

Question

在编译/链接该代码时：

#include <string>
using std::string;

#include <pcrecpp.h>
using pcrecpp::RE;

int main() {
    string
        subj ("Hello world!"),
        rgx ("lolCat([0-9])"),
        result;
    RE(rgx).FullMatch(subj, &result);
}

通过使用以下命令：

i586-mingw32msvc-g++ -std=c++11 -o test.exe -Ipcre-install/include test.cpp \
pcre-install/lib/libpcre.a \
pcre-install/lib/libpcrecpp.a \
pcre-install/lib/libpcreposix.a

我遇到了以下错误：

/tmp/ccAR72nT.o:test.cpp:(.text+0x119): undefined reference to `_imp___ZN7pcrecpp2RE6no_argE'
/tmp/ccAR72nT.o:test.cpp:(.text+0x123): undefined reference to `_imp___ZN7pcrecpp2RE6no_argE'
/tmp/ccAR72nT.o:test.cpp:(.text+0x12d): undefined reference to `_imp___ZN7pcrecpp2RE6no_argE'
/tmp/ccAR72nT.o:test.cpp:(.text+0x137): undefined reference to `_imp___ZN7pcrecpp2RE6no_argE'
/tmp/ccAR72nT.o:test.cpp:(.text+0x141): undefined reference to `_imp___ZN7pcrecpp2RE6no_argE'
/tmp/ccAR72nT.o:test.cpp:(.text+0x14b): more undefined references to `_imp___ZN7pcrecpp2RE6no_argE' follow
/tmp/ccAR72nT.o:test.cpp:(.text+0x1bd): undefined reference to `_imp___ZNK7pcrecpp2RE9FullMatchERKNS_11StringPieceERKNS_3ArgES6_S6_S6_S6_S6_S6_S6_S6_S6_S6_S6_S6_S6_S6_S6_'
/tmp/ccAR72nT.o:test.cpp:(.text+0x1d6): undefined reference to `_imp___ZN7pcrecpp2RED1Ev'
/tmp/ccAR72nT.o:test.cpp:(.text+0x294): undefined reference to `_imp___ZN7pcrecpp2RED1Ev'
/tmp/ccAR72nT.o:test.cpp:(.text$_ZN7pcrecpp3ArgC1EPSs[__ZN7pcrecpp3ArgC1EPSs]+0x16): undefined reference to `_imp___ZN7pcrecpp3Arg12parse_stringEPKciPv'
/tmp/ccAR72nT.o:test.cpp:(.text$_ZN7pcrecpp2REC1ERKSs[__ZN7pcrecpp2REC1ERKSs]+0x6a): undefined reference to `_imp___ZN7pcrecpp2RE4InitERKSsPKNS_10RE_OptionsE'
collect2: error: ld returned 1 exit status

请问我做错了什么吗？

libpcrecpp 是按照以下配置编译的：

../pcre3-8.35/configure --host=i586-mingw32msvc \
--enable-shared=no --enable-static=yes \
--prefix="$(readlink -m ../pcre-install)"

- Alexander Aleksandrovič Klimov

---

也许尝试使用“-static”标志？ - Galik

也许尝试更改库的顺序：https://dev59.com/gmkw5IYBdhLWcg3wXZT8#9968496 - Galik

可能是使用GCC链接静态库的正确方法的重复问题。 - Galik

还有这个可能会有帮助：http://www.rapidtables.com/code/linux/gcc/gcc-l.htm - Galik

对我来说，这些都不起作用。:( - Alexander Aleksandrovič Klimov

Answer 1

您需要将pcrecpp编译为静态库，并在编译代码时定义PCRE_STATIC。请参考https://github.com/vmg/pcre/blob/a257f5c7acc12e64dc2b5aa170b8e4b87dc34f83/pcreposix.h#L117。

i586-mingw32msvc-g++ -std=c++11 -o test.exe -DPCRE_STATIC -Ipcre-install/include test.cpp \
pcre-install/lib/libpcre.a \
pcre-install/lib/libpcrecpp.a \
pcre-install/lib/libpcreposix.a

没有使用 PCRE_STATIC，所有被标记为dllimport的公共函数都有不同的名称混淆。

- vitalyster

Answer 2

您必须定义 PCRE_STATIC（即 -DPCRE_STATIC）。

- Thomas