Erro de carregamento da biblioteca Cygwin

Eu construí a biblioteca spatialite e depois a biblioteca gdal com suporte a spatialite. Também construiu o servidor de mapas que depende do gdal para ter sucesso. Não houve problema com a vinculação.

Quando tento executar um utilitário gdal, recebo:

$ ogrinfo.exe
/usr/local/bin/ogrinfo.exe: error while loading shared libraries: cyggdal-1.dll: cannot open shared object file: No such file or directory

Mas tudo parece bem:

$ ldd /usr/local/bin/ogrinfo.exe
        ntdll.dll => /cygdrive/c/WINDOWS/system32/ntdll.dll (0x7c900000)
        kernel32.dll => /cygdrive/c/WINDOWS/system32/kernel32.dll (0x7c800000)
        cyggdal-1.dll => /usr/local/bin/cyggdal-1.dll (0x710c0000)
        cygcurl-4.dll => /usr/bin/cygcurl-4.dll (0x63d80000)
        cyggcc_s-1.dll => /usr/bin/cyggcc_s-1.dll (0x67f00000)
        cygwin1.dll => /usr/bin/cygwin1.dll (0x61000000)
        ADVAPI32.DLL => /cygdrive/c/WINDOWS/system32/ADVAPI32.DLL (0x77dd0000)
        RPCRT4.dll => /cygdrive/c/WINDOWS/system32/RPCRT4.dll (0x77e70000)
        Secur32.dll => /cygdrive/c/WINDOWS/system32/Secur32.dll (0x77fe0000)
        cygcrypto-0.9.8.dll => /usr/bin/cygcrypto-0.9.8.dll (0x6ba40000)
        cygidn-11.dll => /usr/bin/cygidn-11.dll (0x6c200000)
        cygiconv-2.dll => /usr/bin/cygiconv-2.dll (0x674c0000)
        cygintl-8.dll => /usr/bin/cygintl-8.dll (0x6f5c0000)
        cygssh2-1.dll => /usr/bin/cygssh2-1.dll (0x69ec0000)
        cygz.dll => /usr/bin/cygz.dll (0x692c0000)
        cygssl-0.9.8.dll => /usr/bin/cygssl-0.9.8.dll (0x63400000)
        cygexpat-1.dll => /usr/bin/cygexpat-1.dll (0x66ec0000)
        cyggeos_c-1.dll => /usr/bin/cyggeos_c-1.dll (0x70180000)
        cyggeos-3-1-1.dll => /usr/bin/cyggeos-3-1-1.dll (0x4e0000)
        cygjpeg-7.dll => /usr/bin/cygjpeg-7.dll (0x66e00000)
        cygpng12.dll => /usr/bin/cygpng12.dll (0x6f200000)

Se eu copiar o cyggdal-1.dll para a pasta atual:

$ ogrinfo.exe
/usr/local/bin/ogrinfo.exe: error while loading shared libraries: ?: cannot open shared object file: No such file or directory

Então, o que é um '?' biblioteca?

$ ldd cyggdal-1.dll
        ntdll.dll => /cygdrive/c/WINDOWS/system32/ntdll.dll (0x7c900000)
        kernel32.dll => /cygdrive/c/WINDOWS/system32/kernel32.dll (0x7c800000)
        ??? => ??? (0x710c0000)
        ??? => ??? (0x63d80000)
        ??? => ??? (0x67f00000)
        ??? => ??? (0x61000000)
        ??? => ??? (0x77dd0000)
        ??? => ??? (0x77e70000)
        ??? => ??? (0x77fe0000)
        ??? => ??? (0x6ba40000)
        ??? => ??? (0x6c200000)
        ??? => ??? (0x674c0000)
        ??? => ??? (0x6f5c0000)
        ??? => ??? (0x69ec0000)
        ??? => ??? (0x692c0000)
        ??? => ??? (0x63400000)
        ??? => ??? (0x66ec0000)
        ??? => ??? (0x70180000)
        ??? => ??? (0x4b0000)
        ??? => ??? (0x66e00000)
        ??? => ??? (0x6f200000)

Quem são esses "???" ? Como resolver este problema?

Use cygcheck /usr/bin/[yourbinary](exemplo /usr/bin/curl)

Ele dirá tudo o que não foi possível encontrar. (Ele irá dizer 'não foi possível encontrar [some.dll]'.)

Basta instalar o pacote que a dll nomeia.

Por exemplo - Quando eu corri:

$ curl

Ele retornou:

/usr/bin/curl.exe: error while loading shared libraries: ?: cannot open shared object file: No such file or directory

Então eu corri:

$ cygcheck /usr/bin/curl

Ele retornou:

cygcheck: track_down: could not find cygsasl2-2.dll

Então eu instalei o pacote 'libsasl2'.

É uma biblioteca de tempo de execução instalada através do setup.exe (instalador do cygwin) e o curl começou a funcionar bem.

Eu usei o cmd para executar o utilitário e ele mostrou um pop-up com o nome de dll ausente.

No meu caso, eu queria instalar o SSH. Ele estava reclamando da falta do "cyggssapi-3.dll". Reinstalei o Cygwin e certifique-se de não instalar nada extra e de instalar as versões corretas do SSH + SSL.