MingW下编译openssl

因需要在Win 32平台下支持一部分流媒体处理，而且依赖了OpenSSL，所以借助MingW编译了OpenSSL。遇到并解决了几个过程中的问题，使用的openssl版本比较老（项目原因），这些问题也不见得是大家遇到问题的共性，不过写出来跟大家分享下，以免遇到这些问题的朋友再经历这个过程。

编译使用平台MingW，OpenSSL版本：openssl-1.0.0a

1. 编译过程

如果使用./Configure mingw或./config进行配置，在make时会出现如下错误：

gcc.exe: error: unrecognized command line option '-mno-cygwin'

导致编译无法继续，感觉是一个配置过程的bug，但是没找到好的办法解决。最终work的编译方法：

./Configure dist
make clean
make
make install

编译正常执行。

2. 编译中在engines/e_capi.c出现编译错误

出现错误如下：

e_capi.c: In function 'capi_get_pkey':
e_capi.c:671:3: error: unknown type name 'DSSPUBKEY'
e_capi.c:674:9: error: 'DSSPUBKEY' undeclared (first use in this function)
e_capi.c:674:9: note: each undeclared identifier is reported only once for each function it appears in
e_capi.c:674:20: error: expected expression before ')' token
e_capi.c:675:9: error: request for member 'magic' in something not a structure or union
e_capi.c:678:38: error: request for member 'magic' in something not a structure or union
e_capi.c:683:16: error: request for member 'bitlen' in something not a structure or union
e_capi.c: In function 'capi_rsa_priv_dec':
e_capi.c:912:2: warning: passing argument 6 of 'CryptDecrypt' from incompatible pointer type [enabled by default]
In file included from e_capi.c:72:0:
d:\mingw\bin\../lib/gcc/mingw32/4.7.2/../../../../include/wincrypt.h:1209:23: note: expected 'PDWORD' but argument is of type 'int *'
e_capi.c: In function 'capi_dump_cert':
e_capi.c:1290:2: warning: passing argument 2 of 'd2i_X509' from incompatible pointer type [enabled by default]
In file included from ../include/openssl/engine.h:98:0,
from e_capi.c:106:
../include/openssl/x509.h:833:1: note: expected 'const unsigned char **' but argument is of type 'unsigned char **'
e_capi.c: In function 'capi_open_store':
e_capi.c:1328:25: error: 'CERT_STORE_PROV_SYSTEM_A' undeclared (first use in this function)
e_capi.c: In function 'capi_ctx_new':
e_capi.c:1529:5: error: 'CERT_STORE_READONLY_FLAG' undeclared (first use in this function)
e_capi.c: In function 'capi_load_ssl_client_cert':
e_capi.c:1633:3: warning: passing argument 2 of 'd2i_X509' from incompatible pointer type [enabled by default]
In file included from ../include/openssl/engine.h:98:0,
from e_capi.c:106:
../include/openssl/x509.h:833:1: note: expected 'const unsigned char **' but argument is of type 'const char **'
make[1]: *** [e_capi.o] Error 1
此为MingW平台下wincrypt定义不完整造成，看到网上一位网友的修改方法进行同样处理，问题得以解决，编译$MINGW_HOME/include/wincrypt.h，在1317行之后加入：

typedef struct _PUBKEY{
DWORD magic;
DWORD bitlen;
} DSSPUBKEY;

#define CERT_STORE_PROV_SYSTEM_A ((LPCSTR)9)
#define CERT_STORE_READONLY_FLAG 0x00008000

BOOL WINAPI CryptEnumProvidersA(DWORD, DWORD *, DWORD, DWORD *, LPSTR, DWORD *);

重新make，通过。
3. apps，test链接出现问题

apps下的程序编译出现问题，已经不影响openSSL的使用，但是为了保证编译完整性，还是把问题解决掉，出现问题如下：

s_server.o:s_server.c:(.text+0x730): undefined reference to 'select@20'
s_server.o:s_server.c:(.text+0x762): undefined reference to '__WSAFDIsSet@8'
s_server.o:s_server.c:(.text+0x855): undefined reference to 'shutdown@8'
s_server.o:s_server.c:(.text+0x860): undefined reference to 'closesocket@4'
.....

很明显是WinSock lib没有在link列表中，于是在编译apps/Makefile，line 29，LIBCRYPTO改为：

LIBCRYPTO=-L.. -lws2_32
相关问题解决，重新make，libcrypto.a链接再次出现问题：

../libcrypto.a(rand_win.o):rand_win.c:(.text+0xb86): undefined reference to `CreateDCA@16'
../libcrypto.a(rand_win.o):rand_win.c:(.text+0xb93): undefined reference to `CreateCompatibleDC@4'
../libcrypto.a(rand_win.o):rand_win.c:(.text+0xbaa): undefined reference to `GetDeviceCaps@8'
../libcrypto.a(rand_win.o):rand_win.c:(.text+0xbc1): undefined reference to `GetDeviceCaps@8'
../libcrypto.a(rand_win.o):rand_win.c:(.text+0xbde): undefined reference to `CreateCompatibleBitmap@12'
../libcrypto.a(rand_win.o):rand_win.c:(.text+0xbf5): undefined reference to `SelectObject@8'
../libcrypto.a(rand_win.o):rand_win.c:(.text+0xc18): undefined reference to `GetObjectA@12'
../libcrypto.a(rand_win.o):rand_win.c:(.text+0xcb2): undefined reference to `BitBlt@36'
../libcrypto.a(rand_win.o):rand_win.c:(.text+0xccd): undefined reference to `GetBitmapBits@12'
../libcrypto.a(rand_win.o):rand_win.c:(.text+0xd3c): undefined reference to `SelectObject@8'
../libcrypto.a(rand_win.o):rand_win.c:(.text+0xd47): undefined reference to `DeleteObject@4'
../libcrypto.a(rand_win.o):rand_win.c:(.text+0xd56): undefined reference to `DeleteDC@4'
../libcrypto.a(rand_win.o):rand_win.c:(.text+0xd61): undefined reference to `DeleteDC@4'
d:/mingw/bin/../lib/gcc/mingw32/4.7.2/../../../../mingw32/bin/ld.exe: ../libcrypto.a(rand_win.o): bad reloc address 0x20 in section `.eh_frame'
d:/mingw/bin/../lib/gcc/mingw32/4.7.2/../../../../mingw32/bin/ld.exe: final link
看来还少gdi，再次修改apps/makefile，Line 29，加入gdi lib：

LIBCRYPTO=-L.. -lws2_32 -lgdi32重新make，再次出现问题：
../libcrypto.a(e_capi.o):e_capi.c:(.text+0x15c5): undefined reference to `CertGetCertificateContextProperty@16'
../libcrypto.a(e_capi.o):e_capi.c:(.text+0x162b): undefined reference to `CertGetCertificateContextProperty@16'
../libcrypto.a(e_capi.o):e_capi.c:(.text+0x1740): undefined reference to `CertGetCertificateContextProperty@16'
../libcrypto.a(e_capi.o):e_capi.c:(.text+0x1785): undefined reference to `CertGetCertificateContextProperty@16'
../libcrypto.a(e_capi.o):e_capi.c:(.text+0x1833): undefined reference to `CertFindCertificateInStore@24'
../libcrypto.a(e_capi.o):e_capi.c:(.text+0x184f): undefined reference to `CertEnumCertificatesInStore@8'
../libcrypto.a(e_capi.o):e_capi.c:(.text+0x1b1d): undefined reference to `CertOpenStore@20'
../libcrypto.a(e_capi.o):e_capi.c:(.text+0x1bc4): undefined reference to `CertFreeCertificateContext@4'
../libcrypto.a(e_capi.o):e_capi.c:(.text+0x1be4): undefined reference to `CertEnumCertificatesInStore@8'
../libcrypto.a(e_capi.o):e_capi.c:(.text+0x1c38): undefined reference to `CertCloseStore@8'
../libcrypto.a(e_capi.o):e_capi.c:(.text+0x2231): undefined reference to `CertFreeCertificateContext@4'
../libcrypto.a(e_capi.o):e_capi.c:(.text+0x224b): undefined reference to `CertCloseStore@8'
../libcrypto.a(e_capi.o):e_capi.c:(.text+0x22c2): undefined reference to `CertFreeCertificateContext@4'
../libcrypto.a(e_capi.o):e_capi.c:(.text+0x23ea): undefined reference to `CertEnumCertificatesInStore@8'
../libcrypto.a(e_capi.o):e_capi.c:(.text+0x24bd): undefined reference to `CertDuplicateCertificateContext@4'
../libcrypto.a(e_capi.o):e_capi.c:(.text+0x262a): undefined reference to `CertCloseStore@8'
d:/mingw/bin/../lib/gcc/mingw32/4.7.2/../../../../mingw32/bin/ld.exe: ../libcrypto.a(e_capi.o): bad reloc address 0x0 in section `.data'
d:/mingw/bin/../lib/gcc/mingw32/4.7.2/../../../../mingw32/bin/ld.exe: final link仍然缺少crypt32 lib，继续修改apps\Makefile，Line 29，改为：
LIBCRYPTO=-L.. -lcrypto -lws2_32 -lgdi32 -lcr
8683
ypt32重新make，apps编译完全通过。但在编译test时出现以上同样问题，修改test/Makefile的28行，同样改为

LIBCRYPTO=-L.. -lcrypto -lws2_32 -lgdi32 -lcrypt32

再次重新make，编译全部通过，OpenSSL项目中所有项目编译完成。
Good luck & Enjoy~