windows build failure

[mclycan]

I have all the dependencies for bitcoind installed and successfully built it in windows(can build bitcoin-qt in windows successfully), but when trying to build alpha it fails with the following error:
CXXLD alpha-tx.exe
c:/deps/openssl-1.0.1l\libssl.a(ssl_err2.o):ssl_err2.c:(.text+0x4): undefined reference to ERR_load_crypto_strings' c:/deps/openssl-1.0.1l\libssl.a(ssl_lib.o):ssl_lib.c:(.text+0x1e6): undefined reference toCOMP_CTX_free'
c:/deps/openssl-1.0.1l\libssl.a(ssl_lib.o):ssl_lib.c:(.text+0x202): undefined reference to COMP_CTX_free' c:/deps/openssl-1.0.1l\libssl.a(ssl_lib.o):ssl_lib.c:(.text+0xa2a): undefined reference toBIO_s_socket'
c:/deps/openssl-1.0.1l\libssl.a(ssl_lib.o):ssl_lib.c:(.text+0xb25): undefined reference to BIO_s_socket' c:/deps/openssl-1.0.1l\libssl.a(ssl_lib.o):ssl_lib.c:(.text+0xc95): undefined reference toBIO_s_socket'
c:/deps/openssl-1.0.1l\libssl.a(ssl_lib.o):ssl_lib.c:(.text+0x1460): undefined reference to COMP_CTX_free' c:/deps/openssl-1.0.1l\libssl.a(ssl_lib.o):ssl_lib.c:(.text+0x147c): undefined reference toCOMP_CTX_free'
c:/deps/openssl-1.0.1l\libssl.a(ssl_lib.o):ssl_lib.c:(.text+0x1580): undefined reference to COMP_CTX_free' c:/deps/openssl-1.0.1l\libssl.a(ssl_lib.o):ssl_lib.c:(.text+0x159c): undefined reference toCOMP_CTX_free'
c:/deps/openssl-1.0.1l\libssl.a(ssl_lib.o):ssl_lib.c:(.text+0x309a): undefined reference to COMP_CTX_free' c:/deps/openssl-1.0.1l\libssl.a(ssl_lib.o):ssl_lib.c:(.text+0x30b6): more undefined references toCOMP_CTX_free' follow
c:/deps/openssl-1.0.1l\libssl.a(ssl_lib.o):ssl_lib.c:(.text+0x5ca1): undefined reference to BIO_f_buffer' c:/deps/openssl-1.0.1l\libssl.a(ssl_lib.o):ssl_lib.c:(.text+0x5f9c): undefined reference toX509_STORE_set_default_paths'
c:/deps/openssl-1.0.1l\libssl.a(ssl_lib.o):ssl_lib.c:(.text+0x5fac): undefined reference to X509_STORE_load_locations' c:/mingw32/bin/../lib/gcc/i686-w64-mingw32/4.9.2/../../../../i686-w64-mingw32/bin/ld.exe: c:/deps/openssl-1.0.1l\libssl.a(ssl_lib.o): bad reloc address 0x80 in section.data'
c:/mingw32/bin/../lib/gcc/i686-w64-mingw32/4.9.2/../../../../i686-w64-mingw32/bin/ld.exe: final link failed: Invalid operation
collect2.exe: error: ld returned 1 exit status
make[2]: *** [alpha-tx.exe] Error 1
make[2]: Leaving directory /c/elements-alpha/src' make[1]: *** [all-recursive] Error 1 make[1]: Leaving directory/c/elements-alpha/src'
make: *** [all-recursive] Error 1

[gwillen]

It seems like the problem may be (at least in part) that libssl.a is unable to find symbols in libcrypto.a (see e.g. http://stackoverflow.com/questions/27106580/undefined-reference-to-err-load-crypto-strings for a linux user having a similar problem.) This could be as simple as the order of the libraries being wrong in the Makefile.

I've run into similar errors on OS X with parts of the build. It's not unlikely that the build may be legitimately broken on Windows. I will see what I can find but I do not have a machine with mingw to try this out on.

I would try editing src/Makefile and swapping the order of the references to $(CRYPTO_LIBS) and $(SSL_LIBS) on lines 1653-4. So you should end up with:

$(SSL_LIBS) \
$(CRYPTO_LIBS)

That should fix at least part of the problem, but for all I know it may cause other problems. I don't know why it's in reverse order as compared to the list for alpha_cli just a few lines above, but it's suggestive that it may have been swapped to fix some other link-dependency problem.

[apoelstra]

I had a similar problem with my home-built SSL. My hacky way of fixing it without editing any build files was to have -lcrypto in CRYPTO_LIBS as well as -lssl -lcrypto in SSL_LIBS.

This accomplishes the same goal as @gwillen's suggestion, having -lcrypto after -lssl, and does not seem to cause any other issues.

[mclycan]

@gwillen @apoelstra Thanks for help me! but I have tried this method before, It not work.
And I found an other issue which I missed before: PKG_PROG_PKG_CONFIG: command not found.
So I will let you knew if I have some progress. Thanks again!

[gwillen]

@mclycan: Can you also post the errors you get when you try @apoelstra's method? (It should be at least as good as mine.) That might give us more clues.

The PKG_PROG_PKG_CONFIG error suggests that you don't have pkg-config installed. I don't know if there's a "building for Windows" guide, but you can look through https://github.com/bitcoin/bitcoin/blob/master/doc/build-unix.md and see if you've got all the dependencies listed in there?

If you do have pkg-config, it could be an insufficiently new version, or it could be some other issue (paths, or a Makefile problem on our part.)

(It would also be helpful to see that error in context as well. If there's too much output to put in a comment here, put it into a pastebin, set it to never expire, and paste it here.)

[mclycan]

@gwillen the errors I get are exactly the same as I post before.
And I am try to install "pkg-config" for the msys.
BUT, I can build alpha successfully in OSX, without "pkg-config", which is very strange.

[jspri3]

@mclycan Any luck with the windows build? I would like to try the build if someone has been successful here?

[btcdrak]

@jspri3 FWIW the best way to build for Windows is using the gitian build process [here]https://github.com/ElementsProject/elements/blob/alpha/doc/gitian-building.md).