Missing symbols when cross compiling for windows

[tamird]

Update: there appears to be a bug upstream (in mingw-w64) https://sourceforge.net/p/mingw-w64/bugs/535/.

Currently, it appears that the cgo linker option -Wl,-unresolved-symbols=ignore-all isn't behaving correctly.

[karalabe]

I haven't updated the base distro for a while, maybe it's just an older version of the mingw that doesn't contain this feature yet. I'll try to redo the images using a fresh base image and see where it gets me.

[karalabe]

I've updated the base images, but my windows compilation now fails with:

Compiling for windows/amd64...
# github.com/cockroachdb/c-snappy
In file included from ../c-snappy/snappy-stubs-internal.cc:32:0:
internal/snappy-stubs-internal.h:45:22: fatal error: sys/mman.h: No such file or directory
 #include <sys/mman.h>

Did you also encounter this, or is this a new error message already past the ones you reported?

[tamird]

@karalabe Yeah, I encountered that as well, and it's a separate issue; you should apply this modification: cockroachdb/c-snappy#5

[karalabe]

Ah yeah, with those two patches I'm at

Compiling for windows/amd64...
# github.com/cockroachdb/c-rocksdb
In file included from internal/port/port.h:20:0,
                 from ./adaptive_table_factory.cc:9:
internal/port/win/port_win.h:119:20: error: 'mutex' is not a member of 'std'
   std::unique_lock<std::mutex>& getLock() { return lock; }
                    ^
internal/port/win/port_win.h:119:20: error: 'mutex' is not a member of 'std'
internal/port/win/port_win.h:119:30: error: template argument 1 is invalid
   std::unique_lock<std::mutex>& getLock() { return lock; }
                              ^
internal/port/win/port_win.h:123:8: error: 'mutex' in namespace 'std' does not name a type
   std::mutex m_mutex;
        ^
internal/port/win/port_win.h:124:20: error: 'mutex' is not a member of 'std'
   std::unique_lock<std::mutex> lock;
                    ^
internal/port/win/port_win.h:124:20: error: 'mutex' is not a member of 'std'
internal/port/win/port_win.h:124:30: error: template argument 1 is invalid
   std::unique_lock<std::mutex> lock;
                              ^
internal/port/win/port_win.h: In constructor 'rocksdb::port::RWMutex::RWMutex()':
internal/port/win/port_win.h:136:42: error: 'InitializeSRWLock' was not declared in this scope
   RWMutex() { InitializeSRWLock(&srwLock_); }
                                          ^
internal/port/win/port_win.h: In member function 'void rocksdb::port::RWMutex::ReadLock()':
internal/port/win/port_win.h:138:51: error: 'AcquireSRWLockShared' was not declared in this scope
   void ReadLock() { AcquireSRWLockShared(&srwLock_); }
                                                   ^
internal/port/win/port_win.h: In member function 'void rocksdb::port::RWMutex::WriteLock()':
internal/port/win/port_win.h:140:55: error: 'AcquireSRWLockExclusive' was not declared in this scope
   void WriteLock() { AcquireSRWLockExclusive(&srwLock_); }
                                                       ^
internal/port/win/port_win.h: In member function 'void rocksdb::port::RWMutex::ReadUnlock()':
internal/port/win/port_win.h:142:53: error: 'ReleaseSRWLockShared' was not declared in this scope
   void ReadUnlock() { ReleaseSRWLockShared(&srwLock_); }
                                                     ^
internal/port/win/port_win.h: In member function 'void rocksdb::port::RWMutex::WriteUnlock()':
internal/port/win/port_win.h:144:57: error: 'ReleaseSRWLockExclusive' was not declared in this scope
   void WriteUnlock() { ReleaseSRWLockExclusive(&srwLock_); }
                                                         ^
internal/port/win/port_win.h: At global scope:
internal/port/win/port_win.h:166:8: error: 'condition_variable' in namespace 'std' does not name a type
   std::condition_variable cv_;
        ^
internal/port/win/port_win.h:170:14: error: 'once_flag' in namespace 'std' does not name a type
 typedef std::once_flag OnceType;
              ^
internal/port/win/port_win.h:172:22: error: variable or field 'InitOnce' declared void
 extern void InitOnce(OnceType* once, void (*initializer)());
                      ^
internal/port/win/port_win.h:172:22: error: 'OnceType' was not declared in this scope
internal/port/win/port_win.h:172:32: error: 'once' was not declared in this scope
 extern void InitOnce(OnceType* once, void (*initializer)());
                                ^
internal/port/win/port_win.h:172:45: error: 'initializer' was not declared in this scope
 extern void InitOnce(OnceType* once, void (*initializer)());
                                             ^
2015/10/30 19:22:54 Failed to cross compile package: exit status 2.

I'll look into it. Have to run now.

[karalabe]

I've got past these error messages, but after crunching/compiling for 15-30 secs, it fails with

# github.com/cockroachdb/c-rocksdb
./env_posix.cc:19:23: fatal error: sys/ioctl.h: No such file or directory
 #include <sys/ioctl.h>

which is understandable, since there are no posix stuff available. Could you check why this file is getting included on the Windows builds?

[karalabe]

I've pushed out a new version with updates compilers and platform flags. Please allow a few hours for them to build, after which please try this Windows build. The above header issue should be in your code base.

[karalabe]

PS: You need to set --targets=windows-6.0/* to use the Vista APIs.

[tamird]

Looks like that file shouldn't be included at all. I've removed it and force-pushed the branch.

[karalabe]

Now it crunched for a lot longer, then hit:

# github.com/cockroachdb/c-rocksdb
In file included from ./port_posix.cc:10:0:
internal/port/port_posix.h:44:22: fatal error: endian.h: No such file or directory
   #include <endian.h>

Edit: i.e. again managed to mingle in some non Windows specific header.

[tamird]

This one's a bit trickier; the only way to get cgo to compile c/c++ code in general is to include (or symlink) the c/c++ files in your package's top level directory. In this case, port_posix.cc needs to be compiled when we're on a posix system but not when we're on a windows system.

This boils down to conditional compilation in cgo, which I'm not sure how to do. Do you have any ideas?

EDIT: turns out this is the same story for env_posix.cc; we need to compile it on posix systems or else we get missing symbol errors.

[karalabe]

Not really. Btw, just for the fun of it, I've removed that file for now, and then got till a linker failure:

/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/auto_roll_logger.cc.o:auto_roll_logger.cc:(.text+0x546): undefined reference to `rocksdb::port::Mutex::AssertHeld()'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/auto_roll_logger.cc.o:auto_roll_logger.cc:(.text+0x75c): undefined reference to `rocksdb::port::Mutex::AssertHeld()'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/auto_roll_logger.cc.o:auto_roll_logger.cc:(.text$_ZN7rocksdb14AutoRollLoggerC1EPNS_3EnvERKSsS4_yyNS_12InfoLogLevelE[_ZN7rocksdb14AutoRollLoggerC1EPNS_3EnvERKSsS4_yyNS_12InfoLogLevelE]+0x1b5): undefined reference to `rocksdb::port::Mutex::Mutex(bool)'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/auto_roll_logger.cc.o:auto_roll_logger.cc:(.text$_ZN7rocksdb14AutoRollLoggerC1EPNS_3EnvERKSsS4_yyNS_12InfoLogLevelE[_ZN7rocksdb14AutoRollLoggerC1EPNS_3EnvERKSsS4_yyNS_12InfoLogLevelE]+0x281): undefined reference to `rocksdb::port::Mutex::~Mutex()'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/auto_roll_logger.cc.o:auto_roll_logger.cc:(.text$_ZN7rocksdb14AutoRollLoggerD1Ev[_ZN7rocksdb14AutoRollLoggerD1Ev]+0x28): undefined reference to `rocksdb::port::Mutex::~Mutex()'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/auto_roll_logger.cc.o:auto_roll_logger.cc:(.text$_ZN7rocksdb9MutexLockC1EPNS_4port5MutexE[_ZN7rocksdb9MutexLockC1EPNS_4port5MutexE]+0x26): undefined reference to `rocksdb::port::Mutex::Lock()'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/auto_roll_logger.cc.o:auto_roll_logger.cc:(.text$_ZN7rocksdb9MutexLockD1Ev[_ZN7rocksdb9MutexLockD1Ev]+0x17): undefined reference to `rocksdb::port::Mutex::Unlock()'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/block.cc.o:block.cc:(.text$_ZN7rocksdb13PerfStepTimerC1EPy[_ZN7rocksdb13PerfStepTimerC1EPy]+0x31): undefined reference to `rocksdb::Env::Default()'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/block_based_table_builder.cc.o:block_based_table_builder.cc:(.text$_ZN7rocksdb15Snappy_CompressERKNS_18CompressionOptionsEPKcyPSs[_ZN7rocksdb15Snappy_CompressERKNS_18CompressionOptionsEPKcyPSs]+0x20): undefined reference to `snappy::MaxCompressedLength(unsigned long long)'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/block_based_table_builder.cc.o:block_based_table_builder.cc:(.text$_ZN7rocksdb15Snappy_CompressERKNS_18CompressionOptionsEPKcyPSs[_ZN7rocksdb15Snappy_CompressERKNS_18CompressionOptionsEPKcyPSs]+0x5a): undefined reference to `snappy::RawCompress(char const*, unsigned long long, char*, unsigned long long*)'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/block_based_table_builder.cc.o:block_based_table_builder.cc:(.text$_ZN7rocksdb12LZ4_CompressERKNS_18CompressionOptionsEjPKcyPSs[_ZN7rocksdb12LZ4_CompressERKNS_18CompressionOptionsEjPKcyPSs]+0x9c): undefined reference to `LZ4_compressBound'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/block_based_table_builder.cc.o:block_based_table_builder.cc:(.text$_ZN7rocksdb12LZ4_CompressERKNS_18CompressionOptionsEjPKcyPSs[_ZN7rocksdb12LZ4_CompressERKNS_18CompressionOptionsEjPKcyPSs]+0xe9): undefined reference to `LZ4_compress_limitedOutput'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/block_based_table_builder.cc.o:block_based_table_builder.cc:(.text$_ZN7rocksdb14LZ4HC_CompressERKNS_18CompressionOptionsEjPKcyPSs[_ZN7rocksdb14LZ4HC_CompressERKNS_18CompressionOptionsEjPKcyPSs]+0x98): undefined reference to `LZ4_compressBound'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/block_based_table_builder.cc.o:block_based_table_builder.cc:(.text$_ZN7rocksdb14LZ4HC_CompressERKNS_18CompressionOptionsEjPKcyPSs[_ZN7rocksdb14LZ4HC_CompressERKNS_18CompressionOptionsEjPKcyPSs]+0xf0): undefined reference to `LZ4_compressHC2_limitedOutput'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/c.cc.o:c.cc:(.text+0x6074): undefined reference to `rocksdb::Env::Default()'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/cache.cc.o:cache.cc:(.text+0x6cb): undefined reference to `rocksdb::port::Mutex::Mutex(bool)'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/cache.cc.o:cache.cc:(.text+0x710): undefined reference to `rocksdb::port::Mutex::~Mutex()'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/cache.cc.o:cache.cc:(.text+0x750): undefined reference to `rocksdb::port::Mutex::~Mutex()'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/cache.cc.o:cache.cc:(.text+0x7e0): undefined reference to `rocksdb::port::Mutex::Lock()'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/cache.cc.o:cache.cc:(.text+0x80a): undefined reference to `rocksdb::port::Mutex::Unlock()'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/cache.cc.o:cache.cc:(.text+0x11a5): undefined reference to `rocksdb::port::Mutex::Mutex(bool)'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/cache.cc.o:cache.cc:(.text+0x11ba): undefined reference to `rocksdb::port::Mutex::Mutex(bool)'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/cache.cc.o:cache.cc:(.text+0x132d): undefined reference to `rocksdb::port::Mutex::~Mutex()'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/cache.cc.o:cache.cc:(.text+0x1342): undefined reference to `rocksdb::port::Mutex::~Mutex()'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/cache.cc.o:cache.cc:(.text+0x1404): undefined reference to `rocksdb::port::Mutex::~Mutex()'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/cache.cc.o:cache.cc:(.text+0x1414): undefined reference to `rocksdb::port::Mutex::~Mutex()'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/column_family.cc.o:column_family.cc:(.text$_ZN7rocksdb17InstrumentedMutex6UnlockEv[_ZN7rocksdb17InstrumentedMutex6UnlockEv]+0x14): undefined reference to `rocksdb::port::Mutex::Unlock()'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/column_family.cc.o:column_family.cc:(.text$_ZN7rocksdb17InstrumentedMutex10AssertHeldEv[_ZN7rocksdb17InstrumentedMutex10AssertHeldEv]+0x14): undefined reference to `rocksdb::port::Mutex::AssertHeld()'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/db_impl.cc.o:db_impl.cc:(.text+0x314): undefined reference to `rocksdb::port::GetMaxOpenFiles()'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/db_impl.cc.o:db_impl.cc:(.text$_ZN7rocksdb17InstrumentedMutexC1EPNS_10StatisticsEPNS_3EnvEib[_ZN7rocksdb17InstrumentedMutexC1EPNS_10StatisticsEPNS_3EnvEib]+0x2a): undefined reference to `rocksdb::port::Mutex::Mutex(bool)'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/db_impl.cc.o:db_impl.cc:(.text$_ZN7rocksdb19InstrumentedCondVarC1EPNS_17InstrumentedMutexE[_ZN7rocksdb19InstrumentedCondVarC1EPNS_17InstrumentedMutexE]+0x1c): undefined reference to `rocksdb::port::CondVar::CondVar(rocksdb::port::Mutex*)'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/db_impl.cc.o:db_impl.cc:(.text$_ZN7rocksdb19InstrumentedCondVar9SignalAllEv[_ZN7rocksdb19InstrumentedCondVar9SignalAllEv]+0x14): undefined reference to `rocksdb::port::CondVar::SignalAll()'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/db_impl.cc.o:db_impl.cc:(.text$_ZN7rocksdb10WalManagerC1ERKNS_9DBOptionsERKNS_10EnvOptionsE[_ZN7rocksdb10WalManagerC1ERKNS_9DBOptionsERKNS_10EnvOptionsE]+0x93): undefined reference to `rocksdb::port::Mutex::Mutex(bool)'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/db_impl.cc.o:db_impl.cc:(.text$_ZN7rocksdb17InstrumentedMutexD1Ev[_ZN7rocksdb17InstrumentedMutexD1Ev]+0x14): undefined reference to `rocksdb::port::Mutex::~Mutex()'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/db_impl.cc.o:db_impl.cc:(.text$_ZN7rocksdb19InstrumentedCondVarD1Ev[_ZN7rocksdb19InstrumentedCondVarD1Ev]+0x14): undefined reference to `rocksdb::port::CondVar::~CondVar()'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/db_impl.cc.o:db_impl.cc:(.text$_ZN7rocksdb10WalManagerD1Ev[_ZN7rocksdb10WalManagerD1Ev]+0x18): undefined reference to `rocksdb::port::Mutex::~Mutex()'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/db_ttl_impl.cc.o:db_ttl_impl.cc:(.text+0x724): undefined reference to `rocksdb::Env::Default()'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/delete_scheduler_impl.cc.o:delete_scheduler_impl.cc:(.text+0x1ac): undefined reference to `rocksdb::port::Mutex::Mutex(bool)'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/delete_scheduler_impl.cc.o:delete_scheduler_impl.cc:(.text+0x21d): undefined reference to `rocksdb::port::CondVar::CondVar(rocksdb::port::Mutex*)'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/delete_scheduler_impl.cc.o:delete_scheduler_impl.cc:(.text+0x246): undefined reference to `rocksdb::port::Mutex::Mutex(bool)'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/delete_scheduler_impl.cc.o:delete_scheduler_impl.cc:(.text+0x32a): undefined reference to `rocksdb::port::Mutex::~Mutex()'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/delete_scheduler_impl.cc.o:delete_scheduler_impl.cc:(.text+0x353): undefined reference to `rocksdb::port::CondVar::~CondVar()'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/delete_scheduler_impl.cc.o:delete_scheduler_impl.cc:(.text+0x394): undefined reference to `rocksdb::port::Mutex::~Mutex()'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/delete_scheduler_impl.cc.o:delete_scheduler_impl.cc:(.text+0x41d): undefined reference to `rocksdb::port::CondVar::SignalAll()'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/delete_scheduler_impl.cc.o:delete_scheduler_impl.cc:(.text+0x47d): undefined reference to `rocksdb::port::Mutex::~Mutex()'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/delete_scheduler_impl.cc.o:delete_scheduler_impl.cc:(.text+0x4a1): undefined reference to `rocksdb::port::CondVar::~CondVar()'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/delete_scheduler_impl.cc.o:delete_scheduler_impl.cc:(.text+0x4d3): undefined reference to `rocksdb::port::Mutex::~Mutex()'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/delete_scheduler_impl.cc.o:delete_scheduler_impl.cc:(.text+0x689): undefined reference to `rocksdb::port::CondVar::SignalAll()'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/delete_scheduler_impl.cc.o:delete_scheduler_impl.cc:(.text+0xb78): undefined reference to `rocksdb::port::CondVar::Wait()'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/delete_scheduler_impl.cc.o:delete_scheduler_impl.cc:(.text+0xc38): undefined reference to `rocksdb::port::Mutex::Unlock()'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/delete_scheduler_impl.cc.o:delete_scheduler_impl.cc:(.text+0xc76): undefined reference to `rocksdb::port::Mutex::Lock()'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/delete_scheduler_impl.cc.o:delete_scheduler_impl.cc:(.text+0xd01): undefined reference to `rocksdb::port::CondVar::TimedWait(unsigned long long)'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/delete_scheduler_impl.cc.o:delete_scheduler_impl.cc:(.text+0xd4f): undefined reference to `rocksdb::port::CondVar::SignalAll()'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/delete_scheduler_impl.cc.o:delete_scheduler_impl.cc:(.text+0xfa2): undefined reference to `rocksdb::port::CondVar::Wait()'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/document_db.cc.o:document_db.cc:(.text$_ZN7rocksdb14DocumentDBImplC1EPNS_2DBEPNS_18ColumnFamilyHandleERKSt6vectorISt4pairIPNS_5IndexES4_ESaIS9_EERKNS_7OptionsE[_ZN7rocksdb14DocumentDBImplC1EPNS_2DBEPNS_18ColumnFamilyHandleERKSt6vectorISt4pairIPNS_5IndexES4_ESaIS9_EERKNS_7OptionsE]+0x50): undefined reference to `rocksdb::port::Mutex::Mutex(bool)'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/document_db.cc.o:document_db.cc:(.text$_ZN7rocksdb14DocumentDBImplC1EPNS_2DBEPNS_18ColumnFamilyHandleERKSt6vectorISt4pairIPNS_5IndexES4_ESaIS9_EERKNS_7OptionsE[_ZN7rocksdb14DocumentDBImplC1EPNS_2DBEPNS_18ColumnFamilyHandleERKSt6vectorISt4pairIPNS_5IndexES4_ESaIS9_EERKNS_7OptionsE]+0x65): undefined reference to `rocksdb::port::Mutex::Mutex(bool)'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/document_db.cc.o:document_db.cc:(.text$_ZN7rocksdb14DocumentDBImplC1EPNS_2DBEPNS_18ColumnFamilyHandleERKSt6vectorISt4pairIPNS_5IndexES4_ESaIS9_EERKNS_7OptionsE[_ZN7rocksdb14DocumentDBImplC1EPNS_2DBEPNS_18ColumnFamilyHandleERKSt6vectorISt4pairIPNS_5IndexES4_ESaIS9_EERKNS_7OptionsE]+0x218): undefined reference to `rocksdb::port::Mutex::~Mutex()'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/document_db.cc.o:document_db.cc:(.text$_ZN7rocksdb14DocumentDBImplC1EPNS_2DBEPNS_18ColumnFamilyHandleERKSt6vectorISt4pairIPNS_5IndexES4_ESaIS9_EERKNS_7OptionsE[_ZN7rocksdb14DocumentDBImplC1EPNS_2DBEPNS_18ColumnFamilyHandleERKSt6vectorISt4pairIPNS_5IndexES4_ESaIS9_EERKNS_7OptionsE]+0x22d): undefined reference to `rocksdb::port::Mutex::~Mutex()'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/document_db.cc.o:document_db.cc:(.text$_ZN7rocksdb14DocumentDBImplD1Ev[_ZN7rocksdb14DocumentDBImplD1Ev]+0x137): undefined reference to `rocksdb::port::Mutex::~Mutex()'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/document_db.cc.o:document_db.cc:(.text$_ZN7rocksdb14DocumentDBImplD1Ev[_ZN7rocksdb14DocumentDBImplD1Ev]+0x147): undefined reference to `rocksdb::port::Mutex::~Mutex()'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/env.cc.o:env.cc:(.rdata$_ZTVN7rocksdb10EnvWrapperE[_ZTVN7rocksdb10EnvWrapperE]+0x128): undefined reference to `rocksdb::Env::GenerateUniqueId()'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/env.cc.o:env.cc:(.rdata$_ZTVN7rocksdb3EnvE[_ZTVN7rocksdb3EnvE]+0x128): undefined reference to `rocksdb::Env::GenerateUniqueId()'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/env_hdfs.cc.o:env_hdfs.cc:(.rdata$_ZTVN7rocksdb7HdfsEnvE[_ZTVN7rocksdb7HdfsEnvE]+0x128): undefined reference to `rocksdb::Env::GenerateUniqueId()'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/format.cc.o:format.cc:(.text$_ZN7rocksdb28Snappy_GetUncompressedLengthEPKcyPy[_ZN7rocksdb28Snappy_GetUncompressedLengthEPKcyPy]+0x27): undefined reference to `snappy::GetUncompressedLength(char const*, unsigned long long, unsigned long long*)'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/format.cc.o:format.cc:(.text$_ZN7rocksdb17Snappy_UncompressEPKcyPc[_ZN7rocksdb17Snappy_UncompressEPKcyPc]+0x27): undefined reference to `snappy::RawUncompress(char const*, unsigned long long, char*)'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/format.cc.o:format.cc:(.text$_ZN7rocksdb14LZ4_UncompressEPKcyPij[_ZN7rocksdb14LZ4_UncompressEPKcyPij]+0xb1): undefined reference to `LZ4_decompress_safe'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/instrumented_mutex.cc.o:instrumented_mutex.cc:(.text+0x120): undefined reference to `rocksdb::port::Mutex::Lock()'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/instrumented_mutex.cc.o:instrumented_mutex.cc:(.text+0x24c): undefined reference to `rocksdb::port::CondVar::Wait()'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/instrumented_mutex.cc.o:instrumented_mutex.cc:(.text+0x3a0): undefined reference to `rocksdb::port::CondVar::TimedWait(unsigned long long)'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/leveldb_options.cc.o:leveldb_options.cc:(.text+0xca): undefined reference to `rocksdb::Env::Default()'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/memenv.cc.o:memenv.cc:(.text+0x18f): undefined reference to `rocksdb::port::Mutex::Mutex(bool)'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/memenv.cc.o:memenv.cc:(.text+0x622): undefined reference to `rocksdb::port::Mutex::~Mutex()'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/memenv.cc.o:memenv.cc:(.text+0xbd1): undefined reference to `rocksdb::port::Mutex::Mutex(bool)'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/memenv.cc.o:memenv.cc:(.text+0xbf6): undefined reference to `rocksdb::port::Mutex::~Mutex()'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/memenv.cc.o:memenv.cc:(.text+0xcb6): undefined reference to `rocksdb::port::Mutex::~Mutex()'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/memenv.cc.o:memenv.cc:(.rdata+0x1e8): undefined reference to `rocksdb::Env::GenerateUniqueId()'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/options.cc.o:options.cc:(.text+0xf4a): undefined reference to `rocksdb::Env::Default()'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/rate_limiter.cc.o:rate_limiter.cc:(.text+0x4b): undefined reference to `rocksdb::port::Mutex::Mutex(bool)'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/rate_limiter.cc.o:rate_limiter.cc:(.text+0x7f): undefined reference to `rocksdb::Env::Default()'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/rate_limiter.cc.o:rate_limiter.cc:(.text+0xaa): undefined reference to `rocksdb::port::CondVar::CondVar(rocksdb::port::Mutex*)'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/rate_limiter.cc.o:rate_limiter.cc:(.text+0x1e6): undefined reference to `rocksdb::port::CondVar::~CondVar()'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/rate_limiter.cc.o:rate_limiter.cc:(.text+0x1fb): undefined reference to `rocksdb::port::Mutex::~Mutex()'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/rate_limiter.cc.o:rate_limiter.cc:(.text+0x2e5): undefined reference to `rocksdb::port::CondVar::Signal()'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/rate_limiter.cc.o:rate_limiter.cc:(.text+0x358): undefined reference to `rocksdb::port::CondVar::Signal()'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/rate_limiter.cc.o:rate_limiter.cc:(.text+0x38a): undefined reference to `rocksdb::port::CondVar::Wait()'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/rate_limiter.cc.o:rate_limiter.cc:(.text+0x3e8): undefined reference to `rocksdb::port::CondVar::~CondVar()'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/rate_limiter.cc.o:rate_limiter.cc:(.text+0x3f8): undefined reference to `rocksdb::port::Mutex::~Mutex()'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/rate_limiter.cc.o:rate_limiter.cc:(.text+0x682): undefined reference to `rocksdb::port::CondVar::TimedWait(unsigned long long)'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/rate_limiter.cc.o:rate_limiter.cc:(.text+0x697): undefined reference to `rocksdb::port::CondVar::Wait()'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/rate_limiter.cc.o:rate_limiter.cc:(.text+0x6c4): undefined reference to `rocksdb::port::CondVar::Signal()'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/rate_limiter.cc.o:rate_limiter.cc:(.text+0x74e): undefined reference to `rocksdb::port::CondVar::Signal()'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/rate_limiter.cc.o:rate_limiter.cc:(.text+0x78a): undefined reference to `rocksdb::port::CondVar::Signal()'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/rate_limiter.cc.o:rate_limiter.cc:(.text+0x9d6): undefined reference to `rocksdb::port::CondVar::Signal()'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/rate_limiter.cc.o:rate_limiter.cc:(.text$_ZN7rocksdb18GenericRateLimiter3ReqC1ExPNS_4port5MutexE[_ZN7rocksdb18GenericRateLimiter3ReqC1ExPNS_4port5MutexE]+0x2f): undefined reference to `rocksdb::port::CondVar::CondVar(rocksdb::port::Mutex*)'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/rate_limiter.cc.o:rate_limiter.cc:(.text$_ZN7rocksdb18GenericRateLimiter3ReqD1Ev[_ZN7rocksdb18GenericRateLimiter3ReqD1Ev]+0x18): undefined reference to `rocksdb::port::CondVar::~CondVar()'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/thread_local.cc.o:thread_local.cc:(.text+0x3a8): undefined reference to `rocksdb::port::Mutex::AssertHeld()'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/thread_local.cc.o:thread_local.cc:(.text+0x406): undefined reference to `rocksdb::port::Mutex::AssertHeld()'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/thread_local.cc.o:thread_local.cc:(.text+0x9b1): undefined reference to `rocksdb::port::Mutex::AssertHeld()'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/thread_local.cc.o:thread_local.cc:(.text+0xe1f): undefined reference to `rocksdb::port::Mutex::~Mutex()'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/thread_local.cc.o:thread_local.cc:(.text+0xe54): undefined reference to `rocksdb::port::Mutex::Mutex(bool)'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/thread_status_updater.cc.o:thread_status_updater.cc:(.text+0x690): undefined reference to `rocksdb::Env::Default()'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/thread_status_util.cc.o:thread_status_util.cc:(.text+0x138): undefined reference to `rocksdb::Env::Default()'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/transaction_db_impl.cc.o:transaction_db_impl.cc:(.text$_ZN7rocksdb17InstrumentedMutexC1Eb[_ZN7rocksdb17InstrumentedMutexC1Eb]+0x1d): undefined reference to `rocksdb::port::Mutex::Mutex(bool)'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/version_set.cc.o:version_set.cc:(.text$_ZN7rocksdb19InstrumentedCondVar6SignalEv[_ZN7rocksdb19InstrumentedCondVar6SignalEv]+0x14): undefined reference to `rocksdb::port::CondVar::Signal()'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/write_batch.cc.o:write_batch.cc:(.text+0x1d14): undefined reference to `rocksdb::Env::Default()'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/write_batch_base.cc.o:write_batch_base.cc:(.text+0x49): undefined reference to `rocksdb::Slice::Slice(rocksdb::SliceParts const&, std::string*)'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/write_batch_base.cc.o:write_batch_base.cc:(.text+0x60): undefined reference to `rocksdb::Slice::Slice(rocksdb::SliceParts const&, std::string*)'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/write_batch_base.cc.o:write_batch_base.cc:(.text+0x11d): undefined reference to `rocksdb::Slice::Slice(rocksdb::SliceParts const&, std::string*)'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/write_batch_base.cc.o:write_batch_base.cc:(.text+0x134): undefined reference to `rocksdb::Slice::Slice(rocksdb::SliceParts const&, std::string*)'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/write_batch_base.cc.o:write_batch_base.cc:(.text+0x1dd): undefined reference to `rocksdb::Slice::Slice(rocksdb::SliceParts const&, std::string*)'
/tmp/go-build696393863/github.com/cockroachdb/c-rocksdb/_obj/write_batch_base.cc.o:write_batch_base.cc:(.text+0x265): more undefined references to `rocksdb::Slice::Slice(rocksdb::SliceParts const&, std::string*)' follow
collect2: error: ld returned 1 exit status

[tamird]

Yeah, that's not surprising since we're not compiling any of the windows stuff. I think I have a solution though, stay tuned.

[karalabe]

Ah, ok. That was my second question. That if posix ports have been in there, where are the win ones :)). I have to run now, will only have time to look again tomorrow morning. Docker hub brilliantly crashed with a 500 internal server error while building the new images, so had to restart. Dunno if it'll survive this time.

[tamird]

OK, I dropped another update; give it a try when you get some time.

[karalabe]

Will try it tomorrow. In the mean time the new images rolled out on docker hub, so you can also play with it (and the osx fixes). Just pull a fresh image via docker pull karalabe/xgo-latest

[tamird]

Got a lot further now, but failed on:

# github.com/cockroachdb/c-rocksdb
In file included from ../c-rocksdb/env_platform.cc:4:0:
internal/port/win/env_win.cc:37:41: fatal error: Rpc.h: No such file or directory
 #include <Rpc.h>  // For UUID generation

FWIW: https://msdn.microsoft.com/en-us/library/windows/desktop/aa379205(v=vs.85).aspx
Not sure why that guy is missing, I ran: xgo --go=1.5.1 --targets=windows-6.0/amd64 .

[karalabe]

Out of curiosity, could you try the header with lowercase? Opposed to Windows the Linux cross compiler is case sensitive, and I'm almost certain all include files are lowercase in mingw.

[tamird]

Bingo, that worked. Any way to bake this in so that it doesn't have to be repeated for every project? I had to make two such edits in this case:

diff --git a/internal/port/win/env_win.cc b/internal/port/win/env_win.cc
index 70c68b8..600f7a9 100644
--- a/internal/port/win/env_win.cc
+++ b/internal/port/win/env_win.cc
@@ -34,8 +34,8 @@
 #include "util/thread_status_updater.h"
 #include "util/thread_status_util.h"

-#include <Rpc.h>  // For UUID generation
-#include <Windows.h>
+#include <rpc.h>  // For UUID generation
+#include <windows.h>

 namespace rocksdb {

Meanwhile, we're on to the next error:

internal/port/win/env_win.cc: In member function 'virtual uint64_t rocksdb::{anonymous}::WinEnv::NowMicros()':
internal/port/win/env_win.cc:1821:43: error: unable to find numeric literal operator 'operator""i64'
     const int64_t c_UnixEpochStartTicks = 116444736000000000i64;

EDIT: from http://stackoverflow.com/a/28904550/1261323:

The literal suffix I64 is a Visual C++ extension that specifies a 64-bit signed integer type.

No idea what to do about this one.

---

By the way, separately from the above, the bit of cockroach that depends on c-snappy still fails with a linking error:

# github.com/cockroachdb/cockroach/rpc/codec
/tmp/go-build214432974/github.com/cockroachdb/cockroach/rpc/codec/_obj/lz4.cgo2.o:lz4.cgo2.c:(.text+0x19): undefined reference to `LZ4_compressBound'
/tmp/go-build214432974/github.com/cockroachdb/cockroach/rpc/codec/_obj/lz4.cgo2.o:lz4.cgo2.c:(.text+0x52): undefined reference to `LZ4_compress_limitedOutput'
/tmp/go-build214432974/github.com/cockroachdb/cockroach/rpc/codec/_obj/lz4.cgo2.o:lz4.cgo2.c:(.text+0xc8): undefined reference to `LZ4_decompress_safe'
/tmp/go-build214432974/github.com/cockroachdb/cockroach/rpc/codec/_obj/snappy.cgo2.o:snappy.cgo2.c:(.text+0x20): undefined reference to `snappy_max_compressed_length'
/tmp/go-build214432974/github.com/cockroachdb/cockroach/rpc/codec/_obj/snappy.cgo2.o:snappy.cgo2.c:(.text+0x64): undefined reference to `snappy_compress'
/tmp/go-build214432974/github.com/cockroachdb/cockroach/rpc/codec/_obj/snappy.cgo2.o:snappy.cgo2.c:(.text+0xb4): undefined reference to `snappy_uncompressed_length'
/tmp/go-build214432974/github.com/cockroachdb/cockroach/rpc/codec/_obj/snappy.cgo2.o:snappy.cgo2.c:(.text+0xfc): undefined reference to `snappy_uncompress'
collect2: error: ld returned 1 exit status

[karalabe]

Regarding the i64 thing, the standard notation is LL instead of i64. The former is part of the C++ spec, while the latter is a Microsoft "spec".

However, the next error is:

In file included from ./port_platform.cc:4:0:
internal/port/win/port_win.cc: In function 'rocksdb::port::DIR* rocksdb::port::opendir(const char*)':
internal/port/win/port_win.cc:157:73: error: invalid conversion from 'char*' to 'size_t {aka long long unsigned int}' [-fpermissive]
   strncpy_s(dir->entry_.d_name, dir->data_.name, strlen(dir->data_.name));
                                                                         ^
internal/port/win/port_win.cc:157:72: error: invalid conversion from 'size_t {aka long long unsigned int}' to 'const char*' [-fpermissive]
   strncpy_s(dir->entry_.d_name, dir->data_.name, strlen(dir->data_.name));
                                                                        ^
internal/port/win/port_win.cc:157:73: error: too few arguments to function 'errno_t strncpy_s(char*, size_t, const char*, size_t)'
   strncpy_s(dir->entry_.d_name, dir->data_.name, strlen(dir->data_.name));

Which according to MSDN too has too few parameters: https://msdn.microsoft.com/en-us/library/5dae5d43.aspx.

[tamird]

Actually, it appears it has a 3-parameter overload:

template <size_t size>
errno_t strncpy_s(
   char (&strDest)[size],
   const char *strSource,
   size_t count
); // C++ only

This is in the same MSDN article you linked.

[karalabe]

Isn't that a template function that requires the size to be resolved?

Edit: I.e. the line above your snippet in MSDN.

[tamird]

Sure, and in this case I believe it is. Here's our caller:

strncpy_s(dir->entry_.d_name, dir->data_.name, strlen(dir->data_.name));

dir->entry_ is a dirent:

struct dirent {
  char d_name[_MAX_PATH]; /* filename */
};

[tamird]

@karalabe now that the OSX issues are behind us, any thoughts on this?

[tamird]

Updated the description and subject to indicate that this seems to be a problem with Secure Template Overloads.

[tamird]

Looks like a bug in mingw-w64! https://sourceforge.net/p/mingw-w64/bugs/535/

I've sent a patch to their mailing list.

After applying the patch, we're back to something that might be an xgo problem:

x86_64-w64-mingw32-g++-posix -I . -m64 -mthreads -fmessage-length=0 -Iinternal -Iinternal/include -Iinternal/db -Iinternal/util -Iinternal/utilities/merge_operators/string_append -I../../cockroachdb/c-snappy/internal -DNDEBUG -DSNAPPY -DOS_WIN -I $WORK/github.com/cockroachdb/c-rocksdb/_obj/ -D_WIN32_WINNT=0x0600 -std=c++11 -fno-omit-frame-pointer -momit-leaf-frame-pointer -o $WORK/github.com/cockroachdb/c-rocksdb/_obj/port_platform.cc.o -c ./port_platform.cc
x86_64-w64-mingw32-g++-posix -I . -m64 -mthreads -fmessage-length=0 -o $WORK/github.com/cockroachdb/c-rocksdb/_obj/_cgo_.o $WORK/github.com/cockroachdb/c-rocksdb/_obj/_cgo_main.o $WORK/github.com/cockroachdb/c-rocksdb/_obj/_cgo_export.o $WORK/github.com/cockroachdb/c-rocksdb/_obj/cgo_flags.cgo2.o $WORK/github.com/cockroachdb/c-rocksdb/_obj/env_platform.cc.o $WORK/github.com/cockroachdb/c-rocksdb/_obj/internal_db_builder.cc.o $WORK/github.com/cockroachdb/c-rocksdb/_obj/internal_db_c.cc.o $WORK/github.com/cockroachdb/c-rocksdb/_obj/internal_db_column_family.cc.o $WORK/github.com/cockroachdb/c-rocksdb/_obj/internal_db_compacted_db_impl.cc.o $WORK/github.com/cockroachdb/c-rocksdb/_obj/internal_db_compaction.cc.o $WORK/github.com/cockroachdb/c-rocksdb/_obj/internal_db_compaction_iterator.cc.o $WORK/github.com/cockroachdb/c-rocksdb/_obj/internal_db_compaction_job.cc.o $WORK/github.com/cockroachdb/c-rocksdb/_obj/internal_db_compaction_picker.cc.o $WORK/github.com/cockroachdb/c-rocksdb/_obj/internal_db_convenience.cc.o $WORK/github.com/cockroachdb/c-rocksdb/_obj/internal_db_db_filesnapshot.cc.o $WORK/github.com/cockroachdb/c-rocksdb/_obj/internal_db_db_impl.cc.o $WORK/github.com/cockroachdb/c-rocksdb/_obj/internal_db_db_impl_debug.cc.o $WORK/github.com/cockroachdb/c-rocksdb/_obj/internal_db_db_impl_experimental.cc.o $WORK/github.com/cockroachdb/c-rocksdb/_obj/internal_db_db_impl_readonly.cc.o $WORK/github.com/cockroachdb/c-rocksdb/_obj/internal_db_db_iter.cc.o $WORK/github.com/cockroachdb/c-rocksdb/_obj/internal_db_dbformat.cc.o $WORK/github.com/cockroachdb/c-rocksdb/_obj/internal_db_event_helpers.cc.o $WORK/github.com/cockroachdb/c-rocksdb/_obj/internal_db_experimental.cc.o $WORK/github.com/cockroachdb/c-rocksdb/_obj/internal_db_file_indexer.cc.o $WORK/github.com/cockroachdb/c-rocksdb/_obj/internal_db_filename.cc.o $WORK/github.com/cockroachdb/c-rocksdb/_obj/internal_db_flush_job.cc.o $WORK/github.com/cockroachdb/c-rocksdb/_obj/internal_db_flush_scheduler.cc.o $WORK/github.com/cockroachdb/c-rocksdb/_obj/internal_db_forward_iterator.cc.o $WORK/github.com/cockroachdb/c-rocksdb/_obj/internal_db_internal_stats.cc.o $WORK/github.com/cockroachdb/c-rocksdb/_obj/internal_db_log_reader.cc.o $WORK/github.com/cockroachdb/c-rocksdb/_obj/internal_db_log_writer.cc.o $WORK/github.com/cockroachdb/c-rocksdb/_obj/internal_db_managed_iterator.cc.o $WORK/github.com/cockroachdb/c-rocksdb/_obj/internal_db_memtable.cc.o $WORK/github.com/cockroachdb/c-rocksdb/_obj/internal_db_memtable_allocator.cc.o $WORK/github.com/cockroachdb/c-rocksdb/_obj/internal_db_memtable_list.cc.o $WORK/github.com/cockroachdb/c-rocksdb/_obj/internal_db_merge_helper.cc.o $WORK/github.com/cockroachdb/c-rocksdb/_obj/internal_db_merge_operator.cc.o $WORK/github.com/cockroachdb/c-rocksdb/_obj/internal_db_repair.cc.o $WORK/github.com/cockroachdb/c-rocksdb/_obj/internal_db_slice.cc.o 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-lrpcrt4
# github.com/cockroachdb/c-rocksdb
/tmp/go-build123696693/github.com/cockroachdb/c-rocksdb/_obj/internal_table_block_based_table_builder.cc.o:internal_table_block_based_table_builder.cc:(.text$_ZN7rocksdb15Snappy_CompressERKNS_18CompressionOptionsEPKcyPSs[_ZN7rocksdb15Snappy_CompressERKNS_18CompressionOptionsEPKcyPSs]+0x20): undefined reference to `snappy::MaxCompressedLength(unsigned long long)'
/tmp/go-build123696693/github.com/cockroachdb/c-rocksdb/_obj/internal_table_block_based_table_builder.cc.o:internal_table_block_based_table_builder.cc:(.text$_ZN7rocksdb15Snappy_CompressERKNS_18CompressionOptionsEPKcyPSs[_ZN7rocksdb15Snappy_CompressERKNS_18CompressionOptionsEPKcyPSs]+0x5a): undefined reference to `snappy::RawCompress(char const*, unsigned long long, char*, unsigned long long*)'
/tmp/go-build123696693/github.com/cockroachdb/c-rocksdb/_obj/internal_table_format.cc.o:internal_table_format.cc:(.text$_ZN7rocksdb28Snappy_GetUncompressedLengthEPKcyPy[_ZN7rocksdb28Snappy_GetUncompressedLengthEPKcyPy]+0x27): undefined reference to `snappy::GetUncompressedLength(char const*, unsigned long long, unsigned long long*)'
/tmp/go-build123696693/github.com/cockroachdb/c-rocksdb/_obj/internal_table_format.cc.o:internal_table_format.cc:(.text$_ZN7rocksdb17Snappy_UncompressEPKcyPc[_ZN7rocksdb17Snappy_UncompressEPKcyPc]+0x27): undefined reference to `snappy::RawUncompress(char const*, unsigned long long, char*)'
collect2: error: ld returned 1 exit status
2016/04/25 17:01:39 Failed to cross compile package: exit status 2.

Note that x86_64-w64-mingw32-g++-posix is being invoked with -Wl,--unresolved-symbols=ignore-all, yet that directive seems to be ignored.

[tamird]

The missing overloads patch has been accepted into mingw-w64: https://sourceforge.net/p/mingw-w64/mingw-w64/ci/6ec4fb2d8c1b1abfd5aca69c382c24feb6961342/

[karalabe]

Ah awesome. We (Ethereum) were doing our big release for a while now, just went out a few hours ago so hopefully I'll find a bit more time to address xgo issues too. I'm a bit afraid of the overhead required to build mingw within xgo. I'll look into as to what it would entail.

[tamird]

OK, so folks on the mingw-w64 mailing list have suggested that windows' portable executables don't support undefined symbols after link-time, so xgo is probably not at fault here any more. The rest of this is tracked in golang/go#14985.

It'd be nice to package a more recent mingw-w64 release in xgo, but I'm going to close this thread all the same.