当我执行命令包时，出现编译错误，我不这样做 找到了解决方案。
我使用os Windows 10，Ruby和Rails的版本是：
红宝石： bin：C：/RailsInstaller/Ruby2.0.0/bin/ruby.exe 版本：ruby 2.1.5p273（2014-11-13修订版48405）[i386-mingw32]
轨： bin：C：/RailsInstaller/Ruby2.0.0/bin/rails.bat 版本：Rails 4.1.8
我打算在我的项目中安装的Gem是wubook_wired，用于WuBook API集成，称为“Wired”： https://github.com/eilers/wubook_wired
出现的错误是：
Gem::Ext::BuildError: ERROR: Failed to build gem native extension.
C:/RailsInstaller/Ruby2.1.0/bin/ruby.exe extconf.rb
checking for expat.h... yes
checking for XML_ParserCreate() in -lexpat... no
checking for XML_ParserCreate() in -lxmltok... no
*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of necessary
libraries and/or headers. Check the mkmf.log file for more details. You may
need configuration options.
Provided configuration options:
--with-opt-dir
--without-opt-dir
--with-opt-include
--without-opt-include=${opt-dir}/include
--with-opt-lib
--without-opt-lib=${opt-dir}/lib
--with-make-prog
--without-make-prog
--srcdir=.
--curdir
--ruby=C:/RailsInstaller/Ruby2.1.0/bin/ruby
--with-perl-enc-map
--without-perl-enc-map
--with-expat-dir
--without-expat-dir
--with-expat-include
--without-expat-include=${expat-dir}/include
--with-expat-lib
--without-expat-lib=${expat-dir}/lib
--with-expatlib
--without-expatlib
--with-xmltoklib
--without-xmltoklib
extconf failed, exit code 1
Gem files will remain installed in C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/xmlparser-0.7.2.1 for inspection.
Results logged to C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/extensions/x86-mingw32/2.1.0/xmlparser-0.7.2.1/gem_make.out
An error occurred while installing xmlparser (0.7.2.1), and Bundler cannot
continue.
Make sure that `gem install xmlparser -v '0.7.2.1'` succeeds before bundling.
mkmf.log文件是：
have_library: checking for XML_ParserCreate() in -lexpat... -------------------- no
"gcc -o conftest.exe -IC:/RailsInstaller/Ruby2.1.0/include/ruby-2.1.0/i386-mingw32 -IC:/RailsInstaller/Ruby2.1.0/include/ruby-2.1.0/ruby/backward -IC:/RailsInstaller/Ruby2.1.0/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:/RailsInstaller/Ruby2.1.0/lib -L. -lmsvcrt-ruby210 -lexpat -lshell32 -lws2_32 -liphlpapi -limagehlp -lshlwapi "
conftest.c: In function 't':
conftest.c:16:57: error: 'XML_ParserCreate' undeclared (first use in this function)
conftest.c:16:57: note: each undeclared identifier is reported only once for each function it appears in
conftest.c:16:32: warning: variable 'p' set but not used [-Wunused-but-set-variable]
checked program was:
/* begin */
1: #include "ruby.h"
2:
3: #include
4: #include
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 ((*)()))XML_ParserCreate; return 0; }
/* end */
"gcc -o conftest.exe -IC:/RailsInstaller/Ruby2.1.0/include/ruby-2.1.0/i386-mingw32 -IC:/RailsInstaller/Ruby2.1.0/include/ruby-2.1.0/ruby/backward -IC:/RailsInstaller/Ruby2.1.0/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:/RailsInstaller/Ruby2.1.0/lib -L. -lmsvcrt-ruby210 -lexpat -lshell32 -lws2_32 -liphlpapi -limagehlp -lshlwapi "
conftest.c: In function 't':
conftest.c:16:1: warning: implicit declaration of function 'XML_ParserCreate' [-Wimplicit-function-declaration]
c:/railsinstaller/devkit/mingw/bin/../lib/gcc/i686-w64-mingw32/4.7.2/../../../../i686-w64-mingw32/bin/ld.exe: cannot find -lexpat
collect2.exe: error: ld returned 1 exit status
checked program was:
/* begin */
1: #include "ruby.h"
2:
3: #include
4: #include
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) { XML_ParserCreate(); return 0; }
/* end */
--------------------
have_library: checking for XML_ParserCreate() in -lxmltok... -------------------- no
"gcc -o conftest.exe -IC:/RailsInstaller/Ruby2.1.0/include/ruby-2.1.0/i386-mingw32 -IC:/RailsInstaller/Ruby2.1.0/include/ruby-2.1.0/ruby/backward -IC:/RailsInstaller/Ruby2.1.0/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:/RailsInstaller/Ruby2.1.0/lib -L. -lmsvcrt-ruby210 -lxmltok -lshell32 -lws2_32 -liphlpapi -limagehlp -lshlwapi "
conftest.c: In function 't':
conftest.c:16:57: error: 'XML_ParserCreate' undeclared (first use in this function)
conftest.c:16:57: note: each undeclared identifier is reported only once for each function it appears in
conftest.c:16:32: warning: variable 'p' set but not used [-Wunused-but-set-variable]
checked program was:
/* begin */
1: #include "ruby.h"
2:
3: #include
4: #include
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 ((*)()))
XML_ParserCreate; return 0; }
/* end */
"gcc -o conftest.exe -IC:/RailsInstaller/Ruby2.1.0/include/ruby-2.1.0/i386-mingw32 -IC:/RailsInstaller/Ruby2.1.0/include/ruby-2.1.0/ruby/backward -IC:/RailsInstaller/Ruby2.1.0/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:/RailsInstaller/Ruby2.1.0/lib -L. -lmsvcrt-ruby210 -lxmltok -lshell32 -lws2_32 -liphlpapi -limagehlp -lshlwapi "
conftest.c: In function 't':
conftest.c:16:1: warning: implicit declaration of function 'XML_ParserCreate' [-Wimplicit-function-declaration]
c:/railsinstaller/devkit/mingw/bin/../lib/gcc/i686-w64-mingw32/4.7.2/../../../../i686-w64-mingw32/bin/ld.exe: cannot find -lxmltok
collect2.exe: error: ld returned 1 exit status
checked program was:
/* begin */
1: #include "ruby.h"
2:
3: #include
4: #include
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) { XML_ParserCreate(); return 0; }
/* end */
我非常感谢你的帮助。
答案 0 :(得分：0)
我做了解决方案的后续步骤：
因为我在Devkit文件夹（c：\ RailsInstaller \ DevKit）中找不到libexpat.a： 文本“./i686-w64-mingw32/bin/ld.exe：找不到-lexpat”表示libexpat.a文件的引用。
我下载mingw-w64-install.exe然后安装它。
接下来我运行命令包但尚未更正。
稍后我从“C：\ Program Files（x86）\ mingw-w64 \ i686-5.1.0-posix-dwarf-rt_v4-rev0 \ mingw32 \ opt \ lib”文件夹中复制libexpat.a文件，其中mingw-w64已安装到“C：\ RailsInstaller \ DevKit \ mingw \ i686-w64-mingw32 \ lib”文件夹中。
和“Eureka”：命令包运行正常。
多数人。
请有人有更好的解决方案.....