While compiling Python 2.5.2, I stumbled upon this:

cc -G -R/export/home/webservd/.software/Python-2.5.2/lib
build/temp.solaris-2.10-sun4u-2.5/export/home/webservd/Source/Python-2.5.2/Modules/_ctypes/_ctypes.o
build/temp.solaris-2.10-sun4u-2.5/export/home/webservd/Source/Python-2.5.2/Modules/_ctypes/callbacks.o
build/temp.solaris-2.10-sun4u-2.5/export/home/webservd/Source/Python-2.5.2/Modules/_ctypes/callproc.o
build/temp.solaris-2.10-sun4u-2.5/export/home/webservd/Source/Python-2.5.2/Modules/_ctypes/stgdict.o
build/temp.solaris-2.10-sun4u-2.5/export/home/webservd/Source/Python-2.5.2/Modules/_ctypes/cfield.o
build/temp.solaris-2.10-sun4u-2.5/export/home/webservd/Source/Python-2.5.2/Modules/_ctypes/malloc_closure.o
build/temp.solaris-2.10-sun4u-2.5/export/home/webservd/Source/Python-2.5.2/Modules/_ctypes/libffi/src/prep_cif.o
build/temp.solaris-2.10-sun4u-2.5/export/home/webservd/Source/Python-2.5.2/Modules/_ctypes/libffi/src/sparc/ffi.o
build/temp.solaris-2.10-sun4u-2.5/export/home/webservd/Source/Python-2.5.2/Modules/_ctypes/libffi/src/sparc/v8.o
build/temp.solaris-2.10-sun4u-2.5/export/home/webservd/Source/Python-2.5.2/Modules/_ctypes/libffi/src/sparc/v9.o
-L/export/home/webservd/.software/Python-2.5.2/lib -L/usr/local/lib
-lpython2.5 -o build/lib.solaris-2.10-sun4u-2.5/_ctypes.so -mimpure-text
cc: Warning: illegal option -mimpure-text


--($ ~/Source)-- CC -V
CC: Sun C++ 5.9 SunOS_sparc Patch 124863-01 2007/07/25

--($ ~/Source)-- cc -V
cc: Sun C 5.9 SunOS_sparc Patch 124867-01 2007/07/12
usage: cc [ options] files.  Use 'cc -flags' for details

This is cc/CC from Sun Studio 12 on a Solaris 10 U5 Sparc system.

-mimpure-text is a gcc option.