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May 2009
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2009.05.17 09:30 "Re: Potential problem in libtiff when compiled in MinGW", by Ari Jolma
Ari Jolma kirjoitti: > Bob Friesenhahn kirjoitti: > >> On Sat, 16 May 2009, Ari Jolma wrote: >> >> >>> As I've explained in a GDAL bug report >>> http://trac.osgeo.org/gdal/ticket/2649, it is not enough to use WIN32 >>> and _MSC_VER to determine whether to use %I64 instead of %ll as MinGW >>> uses msvcrt.dll but does not define _MSC_VER. This is an issue in >>> several places in libtiff sources (tif_dumpmode.c, tif_luv.c, tif_lzw.c, >>> tif_print.c, tif_read.c, tif_strip.c, and tif_thunder.c). >>> >> Have you verified that this is an actual problem? My experience with >> MinGW builds is that 'long long' works, including in printf type >> specifications. I am not sure how MinGW accomplishes that but MinGW >> does provide a thin library which could do transformations if required. >> > > I have not, I'll try to put together a test. In the GDAL case there was > a verifiable problem, whose investigation led me to infer that this is > generally a problem, but admittably this may be a bit different. I'll be > back later. > Here's a test: #include "tiffiop.h" main() { thandle_t fd; int i = 1; unsigned long long occ = 1; for (i = 1; i < 11; i++) occ *= 10; TIFFErrorExt(fd, "module", "test unsigned long long with I64: %I64u", occ); TIFFErrorExt(fd, "module", "test unsigned long long with ll: %llu", occ); } testing: ajolma@MOON /c/dev/libtiff/libtiff $ gcc test.c -I libtiff/ -L libtiff/.libs/ -ltiff ajolma@MOON /c/dev/libtiff/libtiff $ ./a.exe module: test unsigned long long with I64: 10000000000. module: test unsigned long long with ll: 1410065408. i.e., %ll does not work but %I64 works in MinGW. This is because MinGW uses msvcrt.dll, which is Microsoft, which.. see for example http://ascending.wordpress.com/2008/04/22/long-long-on-windows-dev-c-mingw/ Ari > Ari > > >> Bob >> -- >> Bob Friesenhahn >> bfriesen@simple.dallas.tx.us, >> http://www.simplesystems.org/users/bfriesen/ >> GraphicsMagick Maintainer, http://www.GraphicsMagick.org/ >> > > > -- Prof. Ari Jolma Environmental Management Information Technology Teknillinen Korkeakoulu / Helsinki University of Technology tel: +358 9 4511 address: POBox 5300, 02015 TKK, Finland Email: ari.jolma at tkk.fi URL: http://geoinformatics.tkk.fi