From: Tim Hunter <cyclists@...>
Date: 2003-05-26T06:16:01+09:00
Subject: Problem compiling extension on Solaris

I have an user who is trying to build RMagick on Solaris with Ruby 1.6.8.
The Makefile is generated by extconf.rb. The link fails with these
messages:

gcc -V 3.3 -Wl,-G -L/usr/local/lib -Wl,-rpath,/usr/local/lib
-L/usr/local/lib -L/usr/local/lib -R/usr/local/lib -L/usr/openwin/lib
-R/usr/openwin/lib -L/usr/local/lib -L/usr/local/lib -o RMagick.so
rmfill.o rmilist.o rmimage.o rminfo.o rmmain.o rmutil.o -L. -lruby -lc
-ldl -lcrypt -lm -lGraphicsMagick -ljbig -llcms -ltiff -lfreetype
-ljasper -ljpeg -lpng -lfpx -lwmflite -ldpstk -ldps -lXext -lSM -lICE
-lX11 -lsocket -lnsl -lbz2 -lxml2 -lz -lpthread -lm
ld: fatal: option -dn and -P are incompatible
ld: fatal: option -dn and -G are incompatible
ld: fatal: Flags processing errors
collect2: ld returned 1 exit status
*** Error code 1
make: Fatal error: Command failed for target `RMagick.so'

In order to successfully build RMagick, he used this command:

% gcc -V 3.3 -shared -L/usr/local/lib -L/usr/local/lib
-R/usr/local/lib -L/usr/openwin/lib -R/usr/openwin/lib
-L/usr/local/lib -L/usr/local/lib -L"/usr/local/lib" -o RMagick.so
rmfill.o rmilist.o rmimage.o rminfo.o rmmain.o rmutil.o �-ldl -lcrypt
-lm �-lGraphicsMagick -ljbig -llcms -ltiff -lfreetype -ljasper -ljpeg
-lpng -lfpx -lwmflite -ldpstk -ldps -lXext -lSM -lICE -lX11 -lsocket
-lnsl -lbz2 -lxml2 -lz -lpthread -lm -lc

What are the -dn, -P, and -G flags used for and why are they being added
to the gcc command? Is there a bug in extconf.rb on Solaris? 

I can provide the extconf.rb script on request.