cygwin编译下，ffi无法调用nginx的函数

heeroz · 2013-11-26T20:16:36+00:00

有个地方不明，怎么我设置了：# vim:set ft= sw=4 ts=4 et:worker_processes 2...

cygwin编译下，ffi无法调用nginx的函数

heeroz

使用cygwin在windows下编译了1.4.3.3版本的openresty，使用时发现ffi调用openssl的函数都可以，比如resty.random.bytes

但是nginx的函数就不行了，string库中32行C.ngx_hex_dump(buf, s, #s)报如下错误

2013/11/26 17:48:25 [error] 12724#0: *7 lua entry thread aborted: runtime error:

/usr/local/openresty/lualib/resty/string.lua:32: No such file or directory

stack traceback:

coroutine 0:

[C]: in function '__index'

/usr/local/openresty/lualib/resty/string.lua:32: in function 'to_hex'

不知这得如何解决？感谢。

agentzh

Hello!

2013/11/26 Heero Zhang:
> 使用cygwin在windows下编译了1.4.3.3版本的openresty，使用时发现ffi调用openssl的函数都可以，比如resty.random.bytes
> 但是nginx的函数就不行了，string库中32行C.ngx_hex_dump(buf, s, #s)报如下错误
>

貌似在 cygwin 上导出符号用的 -Wl,-E 链接器选择没有起作用。你能把你构造 openresty 时生成的
build/nginx-1.4.3/objs/autoconf.err 文件贴出来看么？

当然，“No such file or directory”这个错误信息也有些诡异。。。我手头没有 Cygwin 的环境，所以不容易帮你调试。

另外，请在你本地尝试下面这个最小化了的嵌入 LuaJIT 的 C 宿主程序（用来摸拟 nginx），将此文件保存为 test.c：

    /* File test.c */
    #include <lua.h>
    #include <lualib.h>
    #include <lauxlib.h>
    #include <stdlib.h>
    #include <stdio.h>

    int foo(void) {
        return 32;
    }

    int main(void) {
        lua_State *L;

        L = luaL_newstate();
        luaL_openlibs(L);

        if (luaL_dostring(L, "local ffi = require 'ffi'\n"
                             "ffi.cdef[[int foo(void);]]\n"
                             "print('foo() returned', ffi.C.foo())")
            != 0)
        {
            fprintf(stderr, "failed to load and run Lua code: %s\n",
                    lua_tostring(L, -1));
        }

        lua_close(L);
        return 0;
    }

然后使用下面的 shell 命令进行编译：

    LUAJIT_LIB=/usr/local/openresty/luajit/lib
    LUAJIT_INC=/usr/local/openresty/luajit/include/luajit-2.0

    gcc -Wl,-E -I$LUAJIT_INC -O2 -Wl,-rpath,$LUAJIT_LIB -o test -ldl
-lm -L$LUAJIT_LIB -lluajit-5.1 test.c

完事了，再执行生成的 ./test 可执行文件：

    ./test

期望的输出是

    foo() returned 32

Regards,
-agentzh

heeroz

果然如春哥所想的一样是-E的问题，编译提示这个：

$ ./build.sh

/usr/lib/gcc/i686-pc-cygwin/4.8.2/../../../../i686-pc-cygwin/bin/ld: warning: --export-dynamic is not supported for PE targets, did you mean --export-all-symbols?

这时候运行测试./test返回的就是No such file or directory。

把-E改成--export-all-symbols就正常了

尝试手动把objs/nginx: objs/src/core/nginx.o下的-E改成了--export-all-symbols，重新编译后，nginx跑resty.string库也一切正常。

这么改是否有其他问题还不得知，Windows主要用于本机开发，功能正常就满足了。

感谢春哥！

在 2013年11月27日上午3:38，Yichun Zhang (agentzh) <age...@gmail.com>写道：

Hello!

2013/11/26 Heero Zhang:

> 使用cygwin在windows下编译了1.4.3.3版本的openresty，使用时发现ffi调用openssl的函数都可以，比如resty.random.bytes
> 但是nginx的函数就不行了，string库中32行C.ngx_hex_dump(buf, s, #s)报如下错误
>

貌似在 cygwin 上导出符号用的 -Wl,-E 链接器选择没有起作用。你能把你构造 openresty 时生成的
build/nginx-1.4.3/objs/autoconf.err 文件贴出来看么？

当然，“No such file or directory”这个错误信息也有些诡异。。。我手头没有 Cygwin 的环境，所以不容易帮你调试。

另外，请在你本地尝试下面这个最小化了的嵌入 LuaJIT 的 C 宿主程序（用来摸拟 nginx），将此文件保存为 test.c：

/* File test.c */
#include <lua.h>
#include <lualib.h>
#include <lauxlib.h>
#include <stdlib.h>
#include <stdio.h>

int foo(void) {
return 32;
}

int main(void) {
lua_State *L;

L = luaL_newstate();
luaL_openlibs(L);

if (luaL_dostring(L, "local ffi = require 'ffi'\n"
"ffi.cdef[[int foo(void);]]\n"
"print('foo() returned', ffi.C.foo())")
!= 0)
{
fprintf(stderr, "failed to load and run Lua code: %s\n",
lua_tostring(L, -1));
}

lua_close(L);
return 0;
}

然后使用下面的 shell 命令进行编译：

LUAJIT_LIB=/usr/local/openresty/luajit/lib
LUAJIT_INC=/usr/local/openresty/luajit/include/luajit-2.0

gcc -Wl,-E -I$LUAJIT_INC -O2 -Wl,-rpath,$LUAJIT_LIB -o test -ldl
-lm -L$LUAJIT_LIB -lluajit-5.1 test.c

完事了，再执行生成的 ./test 可执行文件：

./test

期望的输出是

foo() returned 32

Regards,
-agentzh

--

heeroz

autoconf.err文件内容如下，能看到checking for export symbols by default这里有提示

----------------------------------------

checking for C compiler

----------------------------------------

checking for gcc -pipe switch

----------------------------------------

checking for --with-ld-opt="-Wl,-rpath,/usr/local/openresty/luajit/lib"

----------------------------------------

checking for gcc builtin atomic operations

----------------------------------------

checking for C99 variadic macros

----------------------------------------

checking for gcc variadic macros

----------------------------------------

checking for unistd.h

----------------------------------------

checking for inttypes.h

----------------------------------------

checking for limits.h

----------------------------------------

checking for sys/filio.h

objs/autotest.c:3:23: fatal error: sys/filio.h: No such file or directory

#include <sys/filio.h>

compilation terminated.

----------

#include <sys/filio.h>

int main() {

return 0;

}

----------

cc -o objs/autotest objs/autotest.c

----------

----------------------------------------

checking for sys/param.h

----------------------------------------

checking for sys/mount.h

----------------------------------------

checking for sys/statvfs.h

----------------------------------------

checking for crypt.h

----------------------------------------

checking for poll()

----------------------------------------

checking for /dev/poll

objs/autotest.c:4:25: fatal error: sys/devpoll.h: No such file or directory

#include <sys/devpoll.h>

compilation terminated.

----------

#include <sys/types.h>

#include <unistd.h>

#include <sys/devpoll.h>

int main() {

int n, dp; struct dvpoll dvp;

dp = 0;

dvp.dp_fds = NULL;

dvp.dp_nfds = 0;

dvp.dp_timeout = 0;

n = ioctl(dp, DP_POLL, &dvp);

if (n == -1) return 1;

return 0;

}

----------

cc -o objs/autotest objs/autotest.c -Wl,-rpath,/usr/local/openresty/luajit/lib

----------

----------------------------------------

checking for kqueue

objs/autotest.c:4:23: fatal error: sys/event.h: No such file or directory

#include <sys/event.h>

compilation terminated.

----------

#include <sys/types.h>

#include <unistd.h>

#include <sys/event.h>

int main() {

int kq; kq = kqueue();

return 0;

}

----------

cc -o objs/autotest objs/autotest.c -Wl,-rpath,/usr/local/openresty/luajit/lib

----------

----------------------------------------

checking for crypt()

/tmp/ccflWOeh.o:autotest.c:(.text+0x1e): undefined reference to `crypt'

collect2: error: ld returned 1 exit status

----------

#include <sys/types.h>

#include <unistd.h>

int main() {

crypt("test", "salt");;

return 0;

}

----------

cc -o objs/autotest objs/autotest.c -Wl,-rpath,/usr/local/openresty/luajit/lib

----------

----------------------------------------

checking for crypt() in libcrypt

----------------------------------------

checking for F_READAHEAD

objs/autotest.c: In function 'main':

objs/autotest.c:7:14: error: 'F_READAHEAD' undeclared (first use in this function)

fcntl(0, F_READAHEAD, 1);;

objs/autotest.c:7:14: note: each undeclared identifier is reported only once for each function it appears in

----------

#include <sys/types.h>

#include <unistd.h>

#include <fcntl.h>

int main() {

fcntl(0, F_READAHEAD, 1);;

return 0;

}

----------

cc -o objs/autotest objs/autotest.c -Wl,-rpath,/usr/local/openresty/luajit/lib

----------

----------------------------------------

checking for posix_fadvise()

----------------------------------------

checking for O_DIRECT

----------------------------------------

checking for F_NOCACHE

objs/autotest.c: In function 'main':

objs/autotest.c:7:14: error: 'F_NOCACHE' undeclared (first use in this function)

fcntl(0, F_NOCACHE, 1);;

objs/autotest.c:7:14: note: each undeclared identifier is reported only once for each function it appears in

----------

#include <sys/types.h>

#include <unistd.h>

#include <fcntl.h>

int main() {

fcntl(0, F_NOCACHE, 1);;

return 0;

}

----------

cc -o objs/autotest objs/autotest.c -Wl,-rpath,/usr/local/openresty/luajit/lib

----------

----------------------------------------

checking for directio()

objs/autotest.c: In function 'main':

objs/autotest.c:8:17: error: 'DIRECTIO_ON' undeclared (first use in this function)

directio(0, DIRECTIO_ON);;

objs/autotest.c:8:17: note: each undeclared identifier is reported only once for each function it appears in

----------

#include <sys/types.h>

#include <unistd.h>

#include <sys/types.h>

#include <sys/fcntl.h>

int main() {

directio(0, DIRECTIO_ON);;

return 0;

}

----------

cc -o objs/autotest objs/autotest.c -Wl,-rpath,/usr/local/openresty/luajit/lib

----------

----------------------------------------

checking for statfs()

objs/autotest.c: In function 'main':

objs/autotest.c:9:20: error: storage size of 'fs' isn't known

struct statfs fs;

----------

#include <sys/types.h>

#include <unistd.h>

#include <sys/param.h>

#include <sys/mount.h>

int main() {

struct statfs fs;

statfs(".", &fs);;

return 0;

}

----------

cc -o objs/autotest objs/autotest.c -Wl,-rpath,/usr/local/openresty/luajit/lib

----------

----------------------------------------

checking for statvfs()

----------------------------------------

checking for dlopen()

----------------------------------------

checking for sched_yield()

----------------------------------------

checking for SO_SETFIB

objs/autotest.c: In function 'main':

objs/autotest.c:7:31: error: 'SO_SETFIB' undeclared (first use in this function)

setsockopt(0, SOL_SOCKET, SO_SETFIB, NULL, 4);

objs/autotest.c:7:31: note: each undeclared identifier is reported only once for each function it appears in

----------

#include <sys/types.h>

#include <unistd.h>

#include <sys/socket.h>

int main() {

setsockopt(0, SOL_SOCKET, SO_SETFIB, NULL, 4);

return 0;

}

----------

cc -o objs/autotest objs/autotest.c -Wl,-rpath,/usr/local/openresty/luajit/lib

----------

----------------------------------------

checking for SO_ACCEPTFILTER

objs/autotest.c: In function 'main':

objs/autotest.c:7:31: error: 'SO_ACCEPTFILTER' undeclared (first use in this function)

setsockopt(0, SOL_SOCKET, SO_ACCEPTFILTER, NULL, 0);

objs/autotest.c:7:31: note: each undeclared identifier is reported only once for each function it appears in

----------

#include <sys/types.h>

#include <unistd.h>

#include <sys/socket.h>

int main() {

setsockopt(0, SOL_SOCKET, SO_ACCEPTFILTER, NULL, 0);

return 0;

}

----------

cc -o objs/autotest objs/autotest.c -Wl,-rpath,/usr/local/openresty/luajit/lib

----------

----------------------------------------

checking for TCP_DEFER_ACCEPT

objs/autotest.c: In function 'main':

objs/autotest.c:9:32: error: 'TCP_DEFER_ACCEPT' undeclared (first use in this function)

setsockopt(0, IPPROTO_TCP, TCP_DEFER_ACCEPT, NULL, 0);

objs/autotest.c:9:32: note: each undeclared identifier is reported only once for each function it appears in

----------

#include <sys/types.h>

#include <unistd.h>

#include <sys/socket.h>

#include <netinet/in.h>

#include <netinet/tcp.h>

int main() {

setsockopt(0, IPPROTO_TCP, TCP_DEFER_ACCEPT, NULL, 0);

return 0;

}

----------

cc -o objs/autotest objs/autotest.c -Wl,-rpath,/usr/local/openresty/luajit/lib

----------

----------------------------------------

checking for TCP_KEEPIDLE, TCP_KEEPINTVL, TCP_KEEPCNT

objs/autotest.c: In function 'main':

objs/autotest.c:9:32: error: 'TCP_KEEPIDLE' undeclared (first use in this function)

setsockopt(0, IPPROTO_TCP, TCP_KEEPIDLE, NULL, 0);

objs/autotest.c:9:32: note: each undeclared identifier is reported only once for each function it appears in

objs/autotest.c:10:46: error: 'TCP_KEEPINTVL' undeclared (first use in this function)

setsockopt(0, IPPROTO_TCP, TCP_KEEPINTVL, NULL, 0);

objs/autotest.c:11:46: error: 'TCP_KEEPCNT' undeclared (first use in this function)

setsockopt(0, IPPROTO_TCP, TCP_KEEPCNT, NULL, 0);

----------

#include <sys/types.h>

#include <unistd.h>

#include <sys/socket.h>

#include <netinet/in.h>

#include <netinet/tcp.h>

int main() {

setsockopt(0, IPPROTO_TCP, TCP_KEEPIDLE, NULL, 0);

setsockopt(0, IPPROTO_TCP, TCP_KEEPINTVL, NULL, 0);

setsockopt(0, IPPROTO_TCP, TCP_KEEPCNT, NULL, 0);

return 0;

}

----------

cc -o objs/autotest objs/autotest.c -Wl,-rpath,/usr/local/openresty/luajit/lib

----------

----------------------------------------

checking for TCP_INFO

objs/autotest.c: In function 'main':

objs/autotest.c:9:31: error: invalid application of 'sizeof' to incomplete type 'struct tcp_info'

socklen_t optlen = sizeof(struct tcp_info);

objs/autotest.c:10:35: error: storage size of 'ti' isn't known

struct tcp_info ti;

objs/autotest.c:15:46: error: 'TCP_INFO' undeclared (first use in this function)

getsockopt(0, IPPROTO_TCP, TCP_INFO, &ti, &optlen);

objs/autotest.c:15:46: note: each undeclared identifier is reported only once for each function it appears in

----------

#include <sys/types.h>

#include <unistd.h>

#include <sys/socket.h>

#include <netinet/in.h>

#include <netinet/tcp.h>

int main() {

socklen_t optlen = sizeof(struct tcp_info);

struct tcp_info ti;

ti.tcpi_rtt = 0;

ti.tcpi_rttvar = 0;

ti.tcpi_snd_cwnd = 0;

ti.tcpi_rcv_space = 0;

getsockopt(0, IPPROTO_TCP, TCP_INFO, &ti, &optlen);

return 0;

}

----------

cc -o objs/autotest objs/autotest.c -Wl,-rpath,/usr/local/openresty/luajit/lib

----------

----------------------------------------

checking for accept4()

----------------------------------------

checking for int size

----------------------------------------

checking for long size

----------------------------------------

checking for long long size

----------------------------------------

checking for void * size

----------------------------------------

checking for uint64_t

----------------------------------------

checking for sig_atomic_t

----------------------------------------

checking for sig_atomic_t size

----------------------------------------

checking for socklen_t

----------------------------------------

checking for in_addr_t

----------------------------------------

checking for in_port_t

----------------------------------------

checking for rlim_t

checking for uintptr_t

checking for system byte ordering

----------------------------------------

checking for size_t size

----------------------------------------

checking for off_t size

----------------------------------------

checking for time_t size

----------------------------------------

checking for setproctitle()

/tmp/ccmEs23b.o:autotest.c:(.text+0x16): undefined reference to `setproctitle'

collect2: error: ld returned 1 exit status

----------

#include <sys/types.h>

#include <unistd.h>

#include <stdlib.h>

int main() {

setproctitle("test");;

return 0;

}

----------

cc -o objs/autotest objs/autotest.c -Wl,-rpath,/usr/local/openresty/luajit/lib

----------

----------------------------------------

checking for pread()

----------------------------------------

checking for pwrite()

----------------------------------------

checking for sys_nerr

144

----------------------------------------

checking for localtime_r()

----------------------------------------

checking for posix_memalign()

----------------------------------------

checking for memalign()

----------------------------------------

checking for mmap(MAP_ANON|MAP_SHARED)

----------------------------------------

checking for mmap("/dev/zero", MAP_SHARED)

----------------------------------------

checking for System V shared memory

objs/autotest.c: In function 'main':

objs/autotest.c:9:51: error: 'SHM_R' undeclared (first use in this function)

id = shmget(IPC_PRIVATE, 4096, (SHM_R|SHM_W|IPC_CREAT));

objs/autotest.c:9:51: note: each undeclared identifier is reported only once for each function it appears in

objs/autotest.c:9:57: error: 'SHM_W' undeclared (first use in this function)

id = shmget(IPC_PRIVATE, 4096, (SHM_R|SHM_W|IPC_CREAT));

----------

#include <sys/types.h>

#include <unistd.h>

#include <sys/ipc.h>

#include <sys/shm.h>

int main() {

int id;

id = shmget(IPC_PRIVATE, 4096, (SHM_R|SHM_W|IPC_CREAT));

if (id == -1) return 1;

shmctl(id, IPC_RMID, NULL);;

return 0;

}

----------

cc -o objs/autotest objs/autotest.c -Wl,-rpath,/usr/local/openresty/luajit/lib

----------

----------------------------------------

checking for POSIX semaphores

----------------------------------------

checking for struct msghdr.msg_control

----------------------------------------

checking for ioctl(FIONBIO)

----------------------------------------

checking for struct tm.tm_gmtoff

objs/autotest.c: In function 'main':

objs/autotest.c:8:22: error: 'struct tm' has no member named 'tm_gmtoff'

struct tm tm; tm.tm_gmtoff = 0;

objs/autotest.c:9:40: error: 'struct tm' has no member named 'tm_gmtoff'

printf("%d", (int) tm.tm_gmtoff);

----------

#include <sys/types.h>

#include <unistd.h>

#include <time.h>

#include <stdio.h>

int main() {

struct tm tm; tm.tm_gmtoff = 0;

printf("%d", (int) tm.tm_gmtoff);

return 0;

}

----------

cc -o objs/autotest objs/autotest.c -Wl,-rpath,/usr/local/openresty/luajit/lib

----------

----------------------------------------

checking for struct dirent.d_namlen

objs/autotest.c: In function 'main':

objs/autotest.c:8:28: error: 'struct dirent' has no member named 'd_namlen'

struct dirent dir; dir.d_namlen = 0;

objs/autotest.c:9:41: error: 'struct dirent' has no member named 'd_namlen'

printf("%d", (int) dir.d_namlen);

----------

#include <sys/types.h>

#include <unistd.h>

#include <dirent.h>

#include <stdio.h>

int main() {

struct dirent dir; dir.d_namlen = 0;

printf("%d", (int) dir.d_namlen);

return 0;

}

----------

cc -o objs/autotest objs/autotest.c -Wl,-rpath,/usr/local/openresty/luajit/lib

----------

----------------------------------------

checking for struct dirent.d_type

----------------------------------------

checking for sysconf(_SC_NPROCESSORS_ONLN)

----------------------------------------

checking for openat(), fstatat()

----------------------------------------

checking for getaddrinfo()

----------------------------------------

checking for LuaJIT library in /home/hz/ngx_openresty-1.4.3.3/build/luajit-root/usr/local/openresty/luajit/lib and /home/hz/ngx_openresty-1.4.3.3/build/luajit-root/usr/local/openresty/luajit/include/luajit-2.0 (specified by the LUAJIT_LIB and LUAJIT_INC env)

----------------------------------------

checking for export symbols by default

/usr/lib/gcc/i686-pc-cygwin/4.8.2/../../../../i686-pc-cygwin/bin/ld: warning: --export-dynamic is not supported for PE targets, did you mean --export-all-symbols?

----------------------------------------

checking for SO_PASSCRED

objs/autotest.c: In function 'main':

objs/autotest.c:8:31: error: 'SO_PASSCRED' undeclared (first use in this function)

setsockopt(1, SOL_SOCKET, SO_PASSCRED, NULL, 0);;

objs/autotest.c:8:31: note: each undeclared identifier is reported only once for each function it appears in

----------

#include <sys/types.h>

#include <unistd.h>

#include <sys/types.h>

#include <sys/socket.h>

int main() {

setsockopt(1, SOL_SOCKET, SO_PASSCRED, NULL, 0);;

return 0;

}

----------

cc -o objs/autotest objs/autotest.c -Wl,-rpath,/usr/local/openresty/luajit/lib

----------

----------------------------------------

checking for PCRE library

----------------------------------------

checking for PCRE JIT support

----------------------------------------

checking for OpenSSL library

----------------------------------------

checking for zlib library

在 2013年11月27日上午5:09，Heero Zhang <he...@gmail.com>写道：

果然如春哥所想的一样是-E的问题，编译提示这个：
$ ./build.sh
/usr/lib/gcc/i686-pc-cygwin/4.8.2/../../../../i686-pc-cygwin/bin/ld: warning: --export-dynamic is not supported for PE targets, did you mean --export-all-symbols?

这时候运行测试./test返回的就是No such file or directory。
把-E改成--export-all-symbols就正常了

尝试手动把objs/nginx: objs/src/core/nginx.o下的-E改成了--export-all-symbols，重新编译后，nginx跑resty.string库也一切正常。

这么改是否有其他问题还不得知，Windows主要用于本机开发，功能正常就满足了。

感谢春哥！

在 2013年11月27日上午3:38，Yichun Zhang (agentzh) <age...@gmail.com>写道：

Hello!

2013/11/26 Heero Zhang:

> 使用cygwin在windows下编译了1.4.3.3版本的openresty，使用时发现ffi调用openssl的函数都可以，比如resty.random.bytes
> 但是nginx的函数就不行了，string库中32行C.ngx_hex_dump(buf, s, #s)报如下错误
>

貌似在 cygwin 上导出符号用的 -Wl,-E 链接器选择没有起作用。你能把你构造 openresty 时生成的
build/nginx-1.4.3/objs/autoconf.err 文件贴出来看么？

当然，“No such file or directory”这个错误信息也有些诡异。。。我手头没有 Cygwin 的环境，所以不容易帮你调试。

另外，请在你本地尝试下面这个最小化了的嵌入 LuaJIT 的 C 宿主程序（用来摸拟 nginx），将此文件保存为 test.c：

/* File test.c */
#include <lua.h>
#include <lualib.h>
#include <lauxlib.h>
#include <stdlib.h>
#include <stdio.h>

int foo(void) {
return 32;
}

int main(void) {
lua_State *L;

L = luaL_newstate();
luaL_openlibs(L);

if (luaL_dostring(L, "local ffi = require 'ffi'\n"
"ffi.cdef[[int foo(void);]]\n"
"print('foo() returned', ffi.C.foo())")
!= 0)
{
fprintf(stderr, "failed to load and run Lua code: %s\n",
lua_tostring(L, -1));
}

lua_close(L);
return 0;
}

然后使用下面的 shell 命令进行编译：

LUAJIT_LIB=/usr/local/openresty/luajit/lib
LUAJIT_INC=/usr/local/openresty/luajit/include/luajit-2.0

gcc -Wl,-E -I$LUAJIT_INC -O2 -Wl,-rpath,$LUAJIT_LIB -o test -ldl
-lm -L$LUAJIT_LIB -lluajit-5.1 test.c

完事了，再执行生成的 ./test 可执行文件：

./test

期望的输出是

foo() returned 32

Regards,
-agentzh

--

agentzh

Hello!

2013/11/26 Heero Zhang:
> 果然如春哥所想的一样是-E的问题，编译提示这个：
[...]
> 这时候运行测试./test返回的就是No such file or directory。
> 把-E改成--export-all-symbols就正常了
>

多谢反馈！

我刚刚给 ngx_lua 模块准备了一个补丁，让它自动测试并启用 --export-all-symbols 这个链接器选项，你能在你那里测试一下吗？

具体步骤是

    cd /path/to/ngx_openresty-1.4.3.3/bundle/ngx_lua-0.9.2/
    wget http://openresty.org/download/ngx-lua-cygwin-export-symbols.patch
-O a.patch
    patch -p1 < a.patch
    cd ../..
    ./configure --with-luajit -j2
    make -j2
    make install

看看在你那里是否可以工作了。多谢！

Regards,
-agentzh

heeroz

应用了补丁，但没有走到检测"export symbols by default (--export-all-symbols)"的这一步。

在我这check -E并没有failed，这个问题似乎只是警告

checking for export symbols by default (-E) ... found

checking for SO_PASSCRED ... not found

autoconf.err如下

----------------------------------------

checking for export symbols by default (-E)

/usr/lib/gcc/i686-pc-cygwin/4.8.2/../../../../i686-pc-cygwin/bin/ld: warning: --export-dynamic is not supported for PE targets, did you mean --export-all-symbols?

----------------------------------------

checking for SO_PASSCRED

在 2013年11月27日上午5:29，Yichun Zhang (agentzh) <age...@gmail.com>写道：

Hello!

2013/11/26 Heero Zhang:
> 果然如春哥所想的一样是-E的问题，编译提示这个：
[...]

> 这时候运行测试./test返回的就是No such file or directory。
> 把-E改成--export-all-symbols就正常了
>

多谢反馈！

我刚刚给 ngx_lua 模块准备了一个补丁，让它自动测试并启用 --export-all-symbols 这个链接器选项，你能在你那里测试一下吗？

具体步骤是

cd /path/to/ngx_openresty-1.4.3.3/bundle/ngx_lua-0.9.2/
wget http://openresty.org/download/ngx-lua-cygwin-export-symbols.patch
-O a.patch
patch -p1 < a.patch
cd ../..
./configure --with-luajit -j2
make -j2
make install

看看在你那里是否可以工作了。多谢！

Regards,
-agentzh

--

agentzh

Hello!

2013/11/26 Heero Zhang:
> 应用了补丁，但没有走到检测"export symbols by default (--export-all-symbols)"的这一步。
> 在我这check -E并没有failed，这个问题似乎只是警告
> checking for export symbols by default (-E) ... found
> checking for SO_PASSCRED ... not found
>

多谢反馈！请在原有补丁的基础之上，再尝试下面这个补丁：

http://openresty.org/download/ngx-lua-cygwin-export-symbols-2.patch

多谢！

-agentzh

heeroz

已测试，能正常工作了，感谢春哥。

我下面记录了cygwin编译openresty需要改动的地方，能对你或其他人有帮助最好。

主要是在cygwin下，编译lua-cjson，rds, redis等库需要链接lua的lib，而luajit在cygwin下编译不会有.a文件（而是叫cyglua51.dll的文件），而链接dll的话有很多麻烦的地方，所以我改成了静态编译，主要方便。

修改根目录的configure文件

diff --git "a/configure" "b/configure"

index 945c47d..232a135 100644

--- "a/configure"

+++ "b/configure"

@@ -548,7 +548,11 @@ _END_

if (defined $cc) {

$extra_opts .= " CC='$cc'";

}

+ if ($OS eq 'cygwin') {

+ $extra_opts .= " BUILDMODE=static";

+ }

if (defined $cores) {

shell "${make} -j$cores$extra_opts PREFIX=$luajit_prefix", $dry_run;

} else {

修改lua-cjson文件

diff --git "a/ngx_openresty-1.4.3.3/bundle/lua-cjson-1.0.3/Makefile" "b/ngx_openresty-1.4.3.3/bundle/lua-cjson-1.0.3/Makefile"

index d34ff6d..916a6ba 100644

--- "a/ngx_openresty-1.4.3.3/bundle/lua-cjson-1.0.3/Makefile"

+++ "b/ngx_openresty-1.4.3.3/bundle/lua-cjson-1.0.3/Makefile"

@@ -12,6 +12,10 @@ LDFLAGS += -shared

#PREFIX ?= /opt/local

#LDFLAGS += -bundle -undefined dynamic_lookup

+ifeq ($(OS),Windows_NT)

+ LDFLAGS2 += -L../luajit-root/usr/local/openresty/luajit -lluajit-5.1

+endif

LUA_INCLUDE_DIR ?= $(PREFIX)/include

LUA_LIB_DIR ?= $(PREFIX)/lib/lua/$(LUA_VERSION)

@@ -29,7 +33,7 @@ INSTALL ?= install

all: cjson.so

cjson.so: lua_cjson.o strbuf.o

- $(CC) $(LDFLAGS) -o $@ $^

+ $(CC) $(LDFLAGS) -o $@ $^ $(LDFLAGS2)

install:

$(INSTALL) -d $(DESTDIR)/$(LUA_LIB_DIR)

其他lua-rds-parser和lua-redis-parser也是类似修改法

在 2013年11月27日下午3:16，Yichun Zhang (agentzh) <age...@gmail.com>写道：

Hello!

2013/11/26 Heero Zhang:

> 应用了补丁，但没有走到检测"export symbols by default (--export-all-symbols)"的这一步。
> 在我这check -E并没有failed，这个问题似乎只是警告
> checking for export symbols by default (-E) ... found
> checking for SO_PASSCRED ... not found
>

多谢反馈！请在原有补丁的基础之上，再尝试下面这个补丁：

http://openresty.org/download/ngx-lua-cygwin-export-symbols-2.patch

多谢！

-agentzh

--

agentzh

Hello!

2013/11/27 Heero Zhang:
> 已测试，能正常工作了，感谢春哥。
>

好极。多谢反馈！

> 主要是在cygwin下，编译lua-cjson，rds,
> redis等库需要链接lua的lib，而luajit在cygwin下编译不会有.a文件（而是叫cyglua51.dll的文件），而链接dll的话有很多麻烦的地方，所以我改成了静态编译，主要方便。
>

不幸的是，你这里的做法是错误的（而且是常见的一种错误）。

Nginx 本身和你的每一个 Lua C 模块都会包含一个独立的 LuaJIT
库的副本，每个副本都完全不知道其他副本的存在。当这些副本在一个进程空间内的同一份 Lua
代码中混用时，会导致极难调试的问题（包括进程崩溃）。应当绝对避免这种用法。

Regards,
-agentzh