linker - Link error with GetACP under mingw64 (mingw-builds) -


i trying build gdal-1.10.0 (http://trac.osgeo.org/gdal/wiki/downloadsource) using mingw64 (from http://sourceforge.net/projects/mingwbuilds/files/host-windows/ x64-4.8.0-release-posix-seh-rev2.7z). have compiled gdal-1.10.0 under standard mingw (32-bit) version without problem.

the reason have switch mingw64 standard 32-bit mingw distribution not support c++11 features std::thread, , (i suspect) other features well. linking error in end telling me about

undefined reference '__imp_getacp'

(or different decorated name if use 32-bit variant mingw64/mingw-builds). btw, tried different versions of mingw64, including 64-bit, 32-bit, seh, sjlj, gave same error getacp().

i did homework , found instructions similar compilation task: http://www.gaia-gis.it/spatialite-3.0.0-beta/mingw64_how_to.html#env according above website, seems suggest problem has wow64 , correct version of windows dll files cannot used because windows automatically determines depending on whether 32-bit or 64-bit application making call. supposedly problem mingw64 because compiler gcc 64-bit msys hopelessly 32-bit.

but since tried 32-bit versions well, above not seem explain error. more, tried in dirty way comment out calls getacp(), because don't care code pages , purposes. strangely enough, compilation ok (on fresh source getacp()'s commented out), same link error still reported. checked libkernel32.a, libiconv.a in lib folder, , followed instructions in blog above copy dll's out c:\windows\system32 , place them in mingw subfolders appropriate renaming. link error remains. stopped hacking after spending 2 days on without success. can't understand why entire source-code not contain single call function , still getting link error.

can explain might have caused issue between gdal , mingw64, , how fix it?

also, general question mingw64 is able support posix functions? see package names such x64-4.8.0-release-posix-seh-rev2.7z, remember mingw people said never support full posix.

p.s. testing on windows server 2008 r2, 64-bit.

update: complete steps building gdal-1.10.0 under mingw64 (mingw-builds) are:

$./configure

then, edit gdalmake.opt, find gdal_root , replace cygwin drive format dos/mingw format, e.g. change:

gdal_root  = /d/temp/build/gdal-1.10.0

to

gdal_root =  d:/temp/build/gdal-1.10.0

replace

config_libs =   $(gdal_root)/$(libgdal)

with

config_libs =   $(gdal_root)/$(libgdal)   -liconv

finally, 

$ make && make install && cp apps/*.exe /usr/local/bin/

i have accidentally encountered same problem. maybe mingw bug or bad configuration files, solution add -liconv end of linker flags, example, replace 

config_libs =   $(gdal_root)/$(libgdal)

with 

config_libs =   $(gdal_root)/$(libgdal)   -liconv

in gdalmake.opt file (found searching mingw directory getacp in files).


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