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Subject: RE: [1.7] Unable to find jpeg_CreateDecompress but linked against   cygjpeg-62.dll OK
Date: Fri, 27 Mar 2009 12:53:47 -0500
Message-ID: <297343D29C14AA4D822142893ABEAEF306318EA3@srv1163ex1.flightsafety.com>
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References: <297343D29C14AA4D822142893ABEAEF306318DFF AT srv1163ex1 DOT flightsafety DOT com> <49CCFD57 DOT 8030906 AT cwilson DOT fastmail DOT fm> <49CD02C1 DOT 6000603 AT gmail DOT com>
From: "Thrall, Bryan" <bryan DOT thrall AT flightsafety DOT com>
To: <cygwin AT cygwin DOT com>
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Dave Korn wrote on Friday, March 27, 2009 11:46 AM:

> Charles Wilson wrote:
>> Thrall, Bryan wrote:
>>> I recently installed 1.7 (C:\cygwin_1.7) alongside 1.5 (C:\cygwin)
on my
>>> workstation, then reconfigured and rebuilt my application (vital),
which
>>> worked just fine under 1.5 but doesn't under 1.7.
>>=20
>>> "Unable to find jpeg_CreateDecompress in cygwin1.dll".
>>                                            ^^^^^^^^^^^
>>=20
>>> and cygjpeg-62.dll is executable and exports jpeg_CreateDecompress
>>> (according to the Depends tool, which also says vital imports that
>>> symbol by name), so I'm at a loss to explain why that symbol isn't
being
>>> found. Perhaps it is a red herring?
>>=20
>> Did you, by chance, compile with gcc-4, and have -lm on your link
>> command? Try either compiling with gcc-3, or remove -lm.
>=20
>   Or -lpthread.  Yep, this is almost certainly the broken import
tables
> problem again.
>=20
>     cheers,
>       DaveK

Yes, -lm, no -lpthread, but gcc 3.4.4:

$ gcc --version
gcc (GCC) 3.4.4 (cygming special, gdc 0.12, using dmd 0.125)
Copyright (C) 2004 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is
NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE.

thrall AT pc1163-8413-xp ~/clouddev/v9win/util/host
$ cygcheck -cd gcc-core
Cygwin Package Information
Package              Version
gcc-core             3.4.4-999

$ make vital.exe
gcc -Wall -g -O2 -march=3Dpentium4 -mfpmath=3Dsse  -o vital.exe
-Wl,--large-address-aware <bunch of .o and .a files> -lm -ltiff -ljpeg
-lddraw -lwinmm -lglu32 -lopengl32 -lgdi32 -L/usr/local/lib -ldwarf
-L/usr/local/libelf -lelf  -lz  -L/usr/lib -lxml2 -lz -liconv -lm

Here's the build for the .o that actually references
jpeg_CreateDecompress (in case it matters):

gcc -DPACKAGE_NAME=3D\"\" -DPACKAGE_TARNAME=3D\"\" -DPACKAGE_VERSION=3D\"\"
-DPACKAGE_STRING=3D\"\" -DPACKAGE_BUGREPORT=3D\"\" -DPACKAGE=3D\"visual\"
-DVERSION=3D\"8.6\ alpha\" -DHAVE_LIBDWARF=3D1 -DHAVE_GEOTIFF=3D1
-DSTDC_HEADERS=3D1 -DHAVE_SYS_TYPES_H=3D1 -DHAVE_SYS_STAT_H=3D1
-DHAVE_STDLIB_H=3D1 -DHAVE_STRING_H=3D1 -DHAVE_MEMORY_H=3D1 -DHAVE_STRINGS_=
H=3D1
-DHAVE_INTTYPES_H=3D1 -DHAVE_STDINT_H=3D1 -DHAVE_UNISTD_H=3D1 -DHAVE_PTHREA=
D=3D1
-DSCRAMNET=3D1 -DWPCAP=3D1 -DHAVE_DIGUY=3D1 -D_POSIX_C_SOURCE=3D199506 -DV9=
=3D1
-DEMULATION=3D1 -DOpenGL=3D1 -DVPP=3D1 -I. -I../../../visual/vital/loader
-I../../../visual/include -I/usr/include/opengl   -Wall  -g -O2
-march=3Dpentium4 -mfpmath=3Dsse -c ../../../visual/vital/loader/decomp.c

--=20
Bryan Thrall
FlightSafety International
bryan DOT thrall AT flightsafety DOT com

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