Windows build error: undefined reference to `CPLCreateOrAcquireMutex'

[realityexists]

Building on Windows XP x64 with 32-bit MinGW I get the following error:

c:\projects\gdal\gdal-1.8.1\port/cpl_multiproc.cpp:73: undefined reference to `CPLCreateOrAcquireMutex'

I'm building following the instructions at ​http://trac.osgeo.org/postgis/wiki/DevWikiWinMingWSys_20 so the configure command was:

./configure --without-libtool --with-libtiff=internal --with-libz=/c/gtkbundle --prefix=/c/projects/gdal/rel-trunk

Others seem to have run into this as well - see ​http://osgeo-org.1803224.n2.nabble.com/gdal-dev-Unable-to-link-gdal-CPLCreateOrAcquireMutex-reference-not-found-td7073804.html

[Even Rouault]

Could you try the following fix in port/cpl_multiproc.h

Index: port/cpl_multiproc.h
===================================================================
--- port/cpl_multiproc.h	(revision 23708)
+++ port/cpl_multiproc.h	(working copy)
@@ -41,6 +41,9 @@
 
 #if defined(WIN32) && !defined(CPL_MULTIPROC_STUB)
 #  define CPL_MULTIPROC_WIN32
+/* MinGW can have pthread support, so disable it to avoid issues */
+/* in cpl_multiproc.cpp */
+#  undef  CPL_MULTIPROC_PTHREAD
 #endif
 
 #if !defined(CPL_MULTIPROC_WIN32) && !defined(CPL_MULTIPROC_PTHREAD) \

[realityexists]

That fixes it, thank you!

[Even Rouault]

Fixed in trunk (r23728), branches/1.9 (r23729) and branches/1.8 (r23730)

[Even Rouault]

Milestone 1.8.2 deleted