make fails on Cygwin64bit

[DQNEO]

$ gem install ffi
...
Call.o: In function `call_blocking_function':
/home/DK/.rbenv/versions/2.1.0-rc1/lib/ruby/gems/2.1.0/gems/ffi-1.9.3/ext/ffi_c/Call.c:294: undefined reference to `ffi_call'
/home/DK/.rbenv/versions/2.1.0-rc1/lib/ruby/gems/2.1.0/gems/ffi-1.9.3/ext/ffi_c/Call.c:294:(.text+0xa4): relocation truncated to fit: R_X86_64_PC32 against undefined symbol `ffi_call'
Call.o: In function `rbffi_CallFunction':
/home/DK/.rbenv/versions/2.1.0-rc1/lib/ruby/gems/2.1.0/gems/ffi-1.9.3/ext/ffi_c/Call.c:378: undefined reference to `ffi_call'
/home/DK/.rbenv/versions/2.1.0-rc1/lib/ruby/gems/2.1.0/gems/ffi-1.9.3/ext/ffi_c/Call.c:378:(.text+0xa89): relocation truncated to fit: R_X86_64_PC32 against undefined symbol `ffi_call'
Variadic.o: In function `variadic_invoke':
/home/DK/.rbenv/versions/2.1.0-rc1/lib/ruby/gems/2.1.0/gems/ffi-1.9.3/ext/ffi_c/Variadic.c:252: undefined reference to `ffi_call'
/home/DK/.rbenv/versions/2.1.0-rc1/lib/ruby/gems/2.1.0/gems/ffi-1.9.3/ext/ffi_c/Variadic.c:252:(.text+0x36d): relocation truncated to fit: R_X86_64_PC32 against undefined symbol `ffi_call'
/home/DK/.rbenv/versions/2.1.0-rc1/lib/ruby/gems/2.1.0/gems/ffi-1.9.3/ext/ffi_c/libffi-x86_64-cygwin/.libs/libffi_convenience.a(prep_cif.o): In function `ffi_prep_cif':
/home/DK/.rbenv/versions/2.1.0-rc1/lib/ruby/gems/2.1.0/gems/ffi-1.9.3/ext/ffi_c/libffi/src/prep_cif.c:162: undefined reference to `ffi_prep_cif_machdep'
/home/DK/.rbenv/versions/2.1.0-rc1/lib/ruby/gems/2.1.0/gems/ffi-1.9.3/ext/ffi_c/libffi/src/prep_cif.c:162:(.text+0x272): relocation truncated to fit: R_X86_64_PC32 against undefined symbol `ffi_prep_cif_machdep'
/home/DK/.rbenv/versions/2.1.0-rc1/lib/ruby/gems/2.1.0/gems/ffi-1.9.3/ext/ffi_c/libffi-x86_64-cygwin/.libs/libffi_convenience.a(prep_cif.o): In function `ffi_prep_closure':
/home/DK/.rbenv/versions/2.1.0-rc1/lib/ruby/gems/2.1.0/gems/ffi-1.9.3/ext/ffi_c/libffi/src/prep_cif.c:174: undefined reference to `ffi_prep_closure_loc'
/home/DK/.rbenv/versions/2.1.0-rc1/lib/ruby/gems/2.1.0/gems/ffi-1.9.3/ext/ffi_c/libffi/src/prep_cif.c:174:(.text+0x2b7): relocation truncated to fit: R_X86_64_PC32 against undefined symbol `ffi_prep_closure_loc'
collect2: error: ld returned 1 exit status
Makefile:232: recipe for target 'ffi_c.so' failed
make: *** [ffi_c.so] Error 1

[gailu]

I am also getting exact same issue on cygwin64. Following ruby on rails tutorial.

[qnighy]

I successfully built ffi by applying this patch:
https://github.com/Alexpux/MSYS2-packages/blob/master/mingw-w64-cross-gcc/4.8-libffi-cygwin64.patch

[isaacwaller]

that patch worked amazing for me as well. thanks @qnighy

[DQNEO]

I solved it!!
see #284 (comment)

[iray-tno]

I solved it by installing following packages

• libffi6
• libffi-devel
• cygwin32-libffi
• ruby-pkg-config

no need to edit PKG_CONFIG_PATH

[clacke]

No need for cygwin32-libffi.

[seantunwin]

Thanks @iray-tno.
ruby-pkg-config was the one I didn't have that I needed.

[whitelancer]

+1 @iray-tno and @seantunwin; ruby-pkg-config is also what I needed. Not sure how I would have figured that out based on the error messages!

[dansheffler]

This error came up for me while installing Jekyll under Cygwin. I also was able to solve it be installing ruby-pkg-config and libffi-devel via setup.

[amccrea]

Thanks iray-tno, those libraries fixed it for me as well.

[keithdtyler]

I just needed libffi and libffi-devel. cygwin32-libffi and ruby-pkg-config weren't necessary.