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每當我運行gem install mysql，我得到一個Failed to build gem native extension error告訴我檢查mkmf.log。這是該文件的樣子：爲什麼我安裝mysql gem時出現這個錯誤？
have_library: checking for main() in -llibmysql... -------------------- no
"x86_64-w64-mingw32-gcc -o conftest.exe -Ic:/Ruby21-x64/include/ruby-2.1.0/x64-mingw32 -Ic:/Ruby21-x64/include/ruby-2.1.0/ruby/backward -Ic:/Ruby21-x64/include/ruby-2.1.0 -I. -DFD_SETSIZE=2048 -D_WIN32_WINNT=0x0501 -D__MINGW_USE_VC2005_COMPAT -D_FILE_OFFSET_BITS=64 -O3 -fno-omit-frame-pointer -fno-fast-math -g -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wunused-variable -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wimplicit-function-declaration conftest.c -L. -Lc:/Ruby21-x64/lib -L. -lx64-msvcrt-ruby210 -lshell32 -lws2_32 -liphlpapi -limagehlp -lshlwapi "
checked program was:
/* begin */
1: #include "ruby.h"
2:
3: #include <winsock2.h>
4: #include <windows.h>
5: int main(int argc, char **argv)
6: {
7: return 0;
8: }
/* end */
"x86_64-w64-mingw32-gcc -o conftest.exe -Ic:/Ruby21-x64/include/ruby-2.1.0/x64-mingw32 -Ic:/Ruby21-x64/include/ruby-2.1.0/ruby/backward -Ic:/Ruby21-x64/include/ruby-2.1.0 -I. -DFD_SETSIZE=2048 -D_WIN32_WINNT=0x0501 -D__MINGW_USE_VC2005_COMPAT -D_FILE_OFFSET_BITS=64 -O3 -fno-omit-frame-pointer -fno-fast-math -g -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wunused-variable -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wimplicit-function-declaration conftest.c -L. -Lc:/Ruby21-x64/lib -L. -lx64-msvcrt-ruby210 -llibmysql -lshell32 -lws2_32 -liphlpapi -limagehlp -lshlwapi "
conftest.c: In function 't':
conftest.c:16:32: warning: variable 'p' set but not used [-Wunused-but-set-variable]
c:/users/compy/desktop/ruby dev/mingw/bin/../lib/gcc/x86_64-w64-mingw32/4.7.2/../../../../x86_64-w64-mingw32/bin/ld.exe: cannot find -llibmysql
collect2.exe: error: ld returned 1 exit status
checked program was:
/* begin */
1: #include "ruby.h"
2:
3: #include <winsock2.h>
4: #include <windows.h>
5:
6: /*top*/
7: extern int t(void);
8: int main(int argc, char **argv)
9: {
10: if (argc > 1000000) {
11: printf("%p", &t);
12: }
13:
14: return 0;
15: }
16: int t(void) { void ((*volatile p)()); p = (void ((*)()))main; return 0; }
/* end */
"x86_64-w64-mingw32-gcc -o conftest.exe -Ic:/Ruby21-x64/include/ruby-2.1.0/x64-mingw32 -Ic:/Ruby21-x64/include/ruby-2.1.0/ruby/backward -Ic:/Ruby21-x64/include/ruby-2.1.0 -I. -DFD_SETSIZE=2048 -D_WIN32_WINNT=0x0501 -D__MINGW_USE_VC2005_COMPAT -D_FILE_OFFSET_BITS=64 -O3 -fno-omit-frame-pointer -fno-fast-math -g -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wunused-variable -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wimplicit-function-declaration conftest.c -L. -Lc:/Ruby21-x64/lib -L. -lx64-msvcrt-ruby210 -llibmysql -lshell32 -lws2_32 -liphlpapi -limagehlp -lshlwapi "
conftest.c: In function 't':
conftest.c:16:1: error: too few arguments to function 'main'
conftest.c:8:5: note: declared here
checked program was:
/* begin */
1: #include "ruby.h"
2:
3: #include <winsock2.h>
4: #include <windows.h>
5:
6: /*top*/
7: extern int t(void);
8: int main(int argc, char **argv)
9: {
10: if (argc > 1000000) {
11: printf("%p", &t);
12: }
13:
14: return 0;
15: }
16: int t(void) { main(); return 0; }
/* end */
--------------------
我在Windows 8,64位版本。我在C:\Ruby21-x64\bin得到libmysql.dll。我已經安裝了MySQL的Connector/C。我也有MySQL運行。
爲什麼不能安裝mysql寶石？