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Jack Howarth

2010-Apr-10 02:23 UTC

[LLVMdev] darwin dragon-egg build issues

Is anyone building dragon-egg on darwin? I am trying
to build against the fink gcc45 package that I have prepared
for darwin and a updated fink llvm 2.7 package that is built
as...

../llvm-2.7/configure --prefix=/sw --prefix=/sw/lib/llvm --mandir=/sw/share/man
--infodir=/sw/share/info --with-gmp=/sw --with-libiconv-prefix=/usr
--with-system-zlib --with-as=/Developer/usr/bin/as
--with-ld=/Developer/usr/bin/ld --with-nm=/Developer/usr/bin/nm
--enable-optimized --enable-assertions --enable-pic --enable-targets=host-only

Since the gcc45 package installs symlinks to the compilers
in /sw/bin as gcc-4, g++-4, etc, I executed...

GCC=/sw/bin/gcc-4 LLVM_CONFIG=/sw/lib/llvm/bin/llvm-config make

This fails with...

g++ -c  -I/sw/lib/llvm/include  -D_DEBUG -D_GNU_SOURCE -D__STDC_LIMIT_MACROS
-D__STDC_CONSTANT_MACROS -MD -MP -DIN_GCC -DREVISION=\"100909M\"
-DTARGET_NAME=\"x86_64-apple-darwin10.3.0\"
-I/Users/howarth/llvm_svn/dragonegg -Iplugin/include -Wall -Werror
-I/sw/lib/llvm/include  -D_DEBUG -D_GNU_SOURCE -D__STDC_LIMIT_MACROS
-D__STDC_CONSTANT_MACROS -O2  -fno-exceptions -fno-rtti -fno-common
-Woverloaded-virtual /Users/howarth/llvm_svn/dragonegg/utils/target.cpp
<command-line>: error: "__STDC_LIMIT_MACROS" redefined
<command-line>: error: this is the location of the previous definition
<command-line>: error: "__STDC_CONSTANT_MACROS" redefined
<command-line>: error: this is the location of the previous definition
make: *** [target.o] Error 1

with GCC apparently being insufficent to redirect the compilers. Instead, I had
to use...

GCC=/sw/bin/gcc-4 CC=/sw/bin/gcc-4 CXX=/sw/bin/g++-4
LLVM_CONFIG=/sw/lib/llvm/bin/llvm-config make

This however fails with...

/sw/bin/gcc-4 -c  -I/sw/lib/llvm/include  -D_DEBUG -D_GNU_SOURCE
-D__STDC_LIMIT_MACROS -D__STDC_CONSTANT_MACROS -MD -MP -DIN_GCC
-DREVISION=\"100909M\"
-DTARGET_NAME=\"x86_64-apple-darwin10.3.0\"
-I/Users/howarth/llvm_svn/dragonegg -Iplugin/include
-I/Users/howarth/llvm_svn/dragonegg/x86
-I/Users/howarth/llvm_svn/dragonegg/darwin -Wall -Werror -I/sw/lib/llvm/include 
-D_DEBUG -D_GNU_SOURCE -D__STDC_LIMIT_MACROS -D__STDC_CONSTANT_MACROS -O2 
-fno-common /Users/howarth/llvm_svn/dragonegg/llvm-cache.c
In file included from /Users/howarth/llvm_svn/dragonegg/llvm-cache.c:28:0:
/Users/howarth/llvm_svn/dragonegg/llvm-cache.h:31:20: fatal error: config.h: No
such file or directory
compilation terminated.
make: *** [llvm-cache.o] Error 1

If I manually run /sw/lib/llvm/bin/llvm-config, I get...

bash-3.2$ /sw/lib/llvm/bin/llvm-config --prefix
/sw/lib/llvm
bash-3.2$ /sw/lib/llvm/bin/llvm-config --src-root
/sw/src/fink.build/llvm-2.7-1/llvm-2.7
bash-3.2$ /sw/lib/llvm/bin/llvm-config --obj-root
/sw/src/fink.build/llvm-2.7-1/llvm_objdir
bash-3.2$ /sw/lib/llvm/bin/llvm-config --bindir
/sw/lib/llvm/bin
bash-3.2$ /sw/lib/llvm/bin/llvm-config --includedir
/sw/lib/llvm/include
bash-3.2$ /sw/lib/llvm/bin/llvm-config --libdir 
/sw/lib/llvm/lib
bash-3.2$ /sw/lib/llvm/bin/llvm-config --cppflags
-I/sw/lib/llvm/include  -D_DEBUG -D_GNU_SOURCE -D__STDC_LIMIT_MACROS
-D__STDC_CONSTANT_MACROS
bash-3.2$ /sw/lib/llvm/bin/llvm-config --cflags
-I/sw/lib/llvm/include  -D_DEBUG -D_GNU_SOURCE -D__STDC_LIMIT_MACROS
-D__STDC_CONSTANT_MACROS -O2  -fno-common
bash-3.2$ /sw/lib/llvm/bin/llvm-config --cxxflags
-I/sw/lib/llvm/include  -D_DEBUG -D_GNU_SOURCE -D__STDC_LIMIT_MACROS
-D__STDC_CONSTANT_MACROS -O2  -fno-exceptions -fno-rtti -fno-common
-Woverloaded-virtual
bash-3.2$ /sw/lib/llvm/bin/llvm-config --ldflags
-L/sw/lib/llvm/lib  -lpthread -lm 
bash-3.2$ /sw/lib/llvm/bin/llvm-config --libs
-lLLVMLinker -lLLVMipo -lLLVMInterpreter -lLLVMInstrumentation -lLLVMJIT
-lLLVMExecutionEngine -lLLVMBitWriter -lLLVMX86Disassembler -lLLVMX86AsmParser
-lLLVMMCParser -lLLVMX86AsmPrinter -lLLVMX86CodeGen -lLLVMSelectionDAG
-lLLVMX86Info -lLLVMAsmPrinter -lLLVMCodeGen -lLLVMScalarOpts -lLLVMInstCombine
-lLLVMTransformUtils -lLLVMipa -lLLVMAsmParser -lLLVMArchive -lLLVMBitReader
-lLLVMAnalysis -lLLVMTarget -lLLVMMC -lLLVMCore -lLLVMSupport -lLLVMSystem
bash-3.2$ /sw/lib/llvm/bin/llvm-config --libnames 
libLLVMLinker.a libLLVMipo.a libLLVMInterpreter.a libLLVMInstrumentation.a
libLLVMJIT.a libLLVMExecutionEngine.a libLLVMBitWriter.a
libLLVMX86Disassembler.a libLLVMX86AsmParser.a libLLVMMCParser.a
libLLVMX86AsmPrinter.a libLLVMX86CodeGen.a libLLVMSelectionDAG.a
libLLVMX86Info.a libLLVMAsmPrinter.a libLLVMCodeGen.a libLLVMScalarOpts.a
libLLVMInstCombine.a libLLVMTransformUtils.a libLLVMipa.a libLLVMAsmParser.a
libLLVMArchive.a libLLVMBitReader.a libLLVMAnalysis.a libLLVMTarget.a
libLLVMMC.a libLLVMCore.a libLLVMSupport.a libLLVMSystem.a
bash-3.2$ /sw/lib/llvm/bin/llvm-config --components
all analysis archive asmparser asmprinter backend bitreader bitwriter codegen
core engine executionengine instcombine instrumentation interpreter ipa ipo jit
linker mc mcparser native nativecodegen scalaropts selectiondag support system
target transformutils x86 x86asmparser x86asmprinter x86codegen x86disassembler
x86info
bash-3.2$ /sw/lib/llvm/bin/llvm-config --targets-built
x86
bash-3.2$ /sw/lib/llvm/bin/llvm-config --host-target
x86_64-apple-darwin10.3.0
bash-3.2$ /sw/lib/llvm/bin/llvm-config --build-mode
Release

Out of those, actually the --src-root and --obj-root mess up and
output...

bash-3.2$ /sw/lib/llvm/bin/llvm-config --obj-root
/sw/src/fink.build/llvm-2.7-1/llvm_objdirbash-3.2$ 

and

bash-3.2$ /sw/lib/llvm/bin/llvm-config --src-root
/sw/src/fink.build/llvm-2.7-1/llvm-2.7bash-3.2$ 

with a missing newline after the output. It seems that
dragonegg gets confused by the fact that llvm actually
installs the headers in...

/sw/lib/llvm/include/llvm 

and

/sw/lib/llvm/include/llvm-c

rather than directly into /sw/lib/llvm/include.
                                      Jack

Jack Howarth

2010-Apr-10 03:14 UTC

head link

[LLVMdev] darwin dragon-egg build issues

On Fri, Apr 09, 2010 at 10:23:12PM -0400, Jack Howarth
wrote:>    Is anyone building dragon-egg on darwin? I am trying
> to build against the fink gcc45 package that I have prepared
> for darwin and a updated fink llvm 2.7 package that is built
> as...
> 
> ../llvm-2.7/configure --prefix=/sw --prefix=/sw/lib/llvm
--mandir=/sw/share/man --infodir=/sw/share/info --with-gmp=/sw
--with-libiconv-prefix=/usr --with-system-zlib --with-as=/Developer/usr/bin/as
--with-ld=/Developer/usr/bin/ld --with-nm=/Developer/usr/bin/nm
--enable-optimized --enable-assertions --enable-pic --enable-targets=host-only
> 
> Since the gcc45 package installs symlinks to the compilers
> in /sw/bin as gcc-4, g++-4, etc, I executed...
> 
> GCC=/sw/bin/gcc-4 LLVM_CONFIG=/sw/lib/llvm/bin/llvm-config make
> 
> This fails with...
> 
> g++ -c  -I/sw/lib/llvm/include  -D_DEBUG -D_GNU_SOURCE
-D__STDC_LIMIT_MACROS -D__STDC_CONSTANT_MACROS -MD -MP -DIN_GCC
-DREVISION=\"100909M\"
-DTARGET_NAME=\"x86_64-apple-darwin10.3.0\"
-I/Users/howarth/llvm_svn/dragonegg -Iplugin/include -Wall -Werror
-I/sw/lib/llvm/include  -D_DEBUG -D_GNU_SOURCE -D__STDC_LIMIT_MACROS
-D__STDC_CONSTANT_MACROS -O2  -fno-exceptions -fno-rtti -fno-common
-Woverloaded-virtual /Users/howarth/llvm_svn/dragonegg/utils/target.cpp
> <command-line>: error: "__STDC_LIMIT_MACROS" redefined
> <command-line>: error: this is the location of the previous
definition
> <command-line>: error: "__STDC_CONSTANT_MACROS" redefined
> <command-line>: error: this is the location of the previous
definition
> make: *** [target.o] Error 1
> 
> with GCC apparently being insufficent to redirect the compilers. Instead, I
had to use...
> 
> GCC=/sw/bin/gcc-4 CC=/sw/bin/gcc-4 CXX=/sw/bin/g++-4
LLVM_CONFIG=/sw/lib/llvm/bin/llvm-config make
> 
> This however fails with...
> 
> /sw/bin/gcc-4 -c  -I/sw/lib/llvm/include  -D_DEBUG -D_GNU_SOURCE
-D__STDC_LIMIT_MACROS -D__STDC_CONSTANT_MACROS -MD -MP -DIN_GCC
-DREVISION=\"100909M\"
-DTARGET_NAME=\"x86_64-apple-darwin10.3.0\"
-I/Users/howarth/llvm_svn/dragonegg -Iplugin/include
-I/Users/howarth/llvm_svn/dragonegg/x86
-I/Users/howarth/llvm_svn/dragonegg/darwin -Wall -Werror -I/sw/lib/llvm/include 
-D_DEBUG -D_GNU_SOURCE -D__STDC_LIMIT_MACROS -D__STDC_CONSTANT_MACROS -O2 
-fno-common /Users/howarth/llvm_svn/dragonegg/llvm-cache.c
> In file included from /Users/howarth/llvm_svn/dragonegg/llvm-cache.c:28:0:
> /Users/howarth/llvm_svn/dragonegg/llvm-cache.h:31:20: fatal error:
config.h: No such file or directory
> compilation terminated.
> make: *** [llvm-cache.o] Error 1
> 
> If I manually run /sw/lib/llvm/bin/llvm-config, I get...
> 
> bash-3.2$ /sw/lib/llvm/bin/llvm-config --prefix
> /sw/lib/llvm
> bash-3.2$ /sw/lib/llvm/bin/llvm-config --src-root
> /sw/src/fink.build/llvm-2.7-1/llvm-2.7
> bash-3.2$ /sw/lib/llvm/bin/llvm-config --obj-root
> /sw/src/fink.build/llvm-2.7-1/llvm_objdir
> bash-3.2$ /sw/lib/llvm/bin/llvm-config --bindir
> /sw/lib/llvm/bin
> bash-3.2$ /sw/lib/llvm/bin/llvm-config --includedir
> /sw/lib/llvm/include
> bash-3.2$ /sw/lib/llvm/bin/llvm-config --libdir 
> /sw/lib/llvm/lib
> bash-3.2$ /sw/lib/llvm/bin/llvm-config --cppflags
> -I/sw/lib/llvm/include  -D_DEBUG -D_GNU_SOURCE -D__STDC_LIMIT_MACROS
-D__STDC_CONSTANT_MACROS
> bash-3.2$ /sw/lib/llvm/bin/llvm-config --cflags
> -I/sw/lib/llvm/include  -D_DEBUG -D_GNU_SOURCE -D__STDC_LIMIT_MACROS
-D__STDC_CONSTANT_MACROS -O2  -fno-common
> bash-3.2$ /sw/lib/llvm/bin/llvm-config --cxxflags
> -I/sw/lib/llvm/include  -D_DEBUG -D_GNU_SOURCE -D__STDC_LIMIT_MACROS
-D__STDC_CONSTANT_MACROS -O2  -fno-exceptions -fno-rtti -fno-common
-Woverloaded-virtual
> bash-3.2$ /sw/lib/llvm/bin/llvm-config --ldflags
> -L/sw/lib/llvm/lib  -lpthread -lm 
> bash-3.2$ /sw/lib/llvm/bin/llvm-config --libs
> -lLLVMLinker -lLLVMipo -lLLVMInterpreter -lLLVMInstrumentation -lLLVMJIT
-lLLVMExecutionEngine -lLLVMBitWriter -lLLVMX86Disassembler -lLLVMX86AsmParser
-lLLVMMCParser -lLLVMX86AsmPrinter -lLLVMX86CodeGen -lLLVMSelectionDAG
-lLLVMX86Info -lLLVMAsmPrinter -lLLVMCodeGen -lLLVMScalarOpts -lLLVMInstCombine
-lLLVMTransformUtils -lLLVMipa -lLLVMAsmParser -lLLVMArchive -lLLVMBitReader
-lLLVMAnalysis -lLLVMTarget -lLLVMMC -lLLVMCore -lLLVMSupport -lLLVMSystem
> bash-3.2$ /sw/lib/llvm/bin/llvm-config --libnames 
> libLLVMLinker.a libLLVMipo.a libLLVMInterpreter.a libLLVMInstrumentation.a
libLLVMJIT.a libLLVMExecutionEngine.a libLLVMBitWriter.a
libLLVMX86Disassembler.a libLLVMX86AsmParser.a libLLVMMCParser.a
libLLVMX86AsmPrinter.a libLLVMX86CodeGen.a libLLVMSelectionDAG.a
libLLVMX86Info.a libLLVMAsmPrinter.a libLLVMCodeGen.a libLLVMScalarOpts.a
libLLVMInstCombine.a libLLVMTransformUtils.a libLLVMipa.a libLLVMAsmParser.a
libLLVMArchive.a libLLVMBitReader.a libLLVMAnalysis.a libLLVMTarget.a
libLLVMMC.a libLLVMCore.a libLLVMSupport.a libLLVMSystem.a
> bash-3.2$ /sw/lib/llvm/bin/llvm-config --components
> all analysis archive asmparser asmprinter backend bitreader bitwriter
codegen core engine executionengine instcombine instrumentation interpreter ipa
ipo jit linker mc mcparser native nativecodegen scalaropts selectiondag support
system target transformutils x86 x86asmparser x86asmprinter x86codegen
x86disassembler x86info
> bash-3.2$ /sw/lib/llvm/bin/llvm-config --targets-built
> x86
> bash-3.2$ /sw/lib/llvm/bin/llvm-config --host-target
> x86_64-apple-darwin10.3.0
> bash-3.2$ /sw/lib/llvm/bin/llvm-config --build-mode
> Release
> 
> Out of those, actually the --src-root and --obj-root mess up and
> output...
> 
> bash-3.2$ /sw/lib/llvm/bin/llvm-config --obj-root
> /sw/src/fink.build/llvm-2.7-1/llvm_objdirbash-3.2$ 
> 
> and
> 
> bash-3.2$ /sw/lib/llvm/bin/llvm-config --src-root
> /sw/src/fink.build/llvm-2.7-1/llvm-2.7bash-3.2$ 
> 
> with a missing newline after the output. It seems that
> dragonegg gets confused by the fact that llvm actually
> installs the headers in...
> 
> /sw/lib/llvm/include/llvm 
> 
> and
> 
> /sw/lib/llvm/include/llvm-c
> 
> rather than directly into /sw/lib/llvm/include.
>                                       Jack
> 
If I compare how my llvm-gcc42 package builds against
the llvm package files, I find...

g++ -c -g -O2 -mdynamic-no-pic -DIN_GCC -W -Wall -Wwrite-strings -pedantic
-Wno-long-long -Wno-variadic-macros -Wmissing-format-attribute -mdynamic-no-pic
-DHAVE_CONFIG_H -Wno-unused
-DTARGET_NAME=\"x86_64-apple-darwin10.3.0\" -frandom-seed=0 -DNDEBUG
-I. -I. -I../../llvm-gcc4.2-2.7.source/gcc -I../../llvm-gcc4.2-2.7.source/gcc/.
-I../../llvm-gcc4.2-2.7.source/gcc/../include
-I../../llvm-gcc4.2-2.7.source/gcc/../libcpp/include -I/sw/include 
-I../../llvm-gcc4.2-2.7.source/gcc/../libdecnumber -I../libdecnumber
-I/sw/lib/llvm/include -I/sw/include -DENABLE_LLVM -I/sw/lib/llvm/include 
-D_DEBUG -D_GNU_SOURCE -D__STDC_LIMIT_MACROS -D__STDC_CONSTANT_MACROS   -I. -I.
-I../../llvm-gcc4.2-2.7.source/gcc -I../../llvm-gcc4.2-2.7.source/gcc/.
-I../../llvm-gcc4.2-2.7.source/gcc/../include
-I../../llvm-gcc4.2-2.7.source/gcc/../libcpp/include -I/sw/include 
-I../../llvm-gcc4.2-2.7.source/gcc/../libdecnumber -I../libdecnumber
-I/sw/lib/llvm/include ../../llvm-gcc4.2-2.7.source/gcc/llvm-main.cpp -o
llvm-main.o

where in ../../llvm-gcc4.2-2.7.source/gcc/llvm-main.cpp, we have...

#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/PrettyStackTrace.h"

Shouldn't dragonegg be doing the same...providing
explicit paths from what 'llvm-config --includedir'
returns? Where exactly are some of these headers supposed
to be coming from in llvm-cache.h?

#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "target.h"
#include "tree.h"

Shouldn't some of these have explicit paths like...

#include "llvm/Config/config.h"

or

#include "llvm/Target/target.h"

as is the case in llvm-gcc4.2?
               Jack



> 
> 
> 
> 
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev

Duncan Sands

2010-Apr-10 11:52 UTC

head link

[LLVMdev] darwin dragon-egg build issues

Hi Jack,
>     Is anyone building dragon-egg on darwin?
Anton built it once.  There were some problems with dynamic libraries: gcc's
plugin support requires the use of dynamic libraries, and the configure logic
it uses thinks that darwin does not support dynamic libraries!  So it is
possible that plugin support was automatically disabled because of this.  Try
configuring with --enable-plugin

I am trying> to build against the fink gcc45 package that I have prepared
> for darwin and a updated fink llvm 2.7 package that is built
> as...
>
> ../llvm-2.7/configure --prefix=/sw --prefix=/sw/lib/llvm
--mandir=/sw/share/man --infodir=/sw/share/info --with-gmp=/sw
--with-libiconv-prefix=/usr --with-system-zlib --with-as=/Developer/usr/bin/as
--with-ld=/Developer/usr/bin/ld --with-nm=/Developer/usr/bin/nm
--enable-optimized --enable-assertions --enable-pic --enable-targets=host-only
>
> Since the gcc45 package installs symlinks to the compilers
> in /sw/bin as gcc-4, g++-4, etc, I executed...
>
> GCC=/sw/bin/gcc-4 LLVM_CONFIG=/sw/lib/llvm/bin/llvm-config make
>
> This fails with...
>
> g++ -c  -I/sw/lib/llvm/include  -D_DEBUG -D_GNU_SOURCE
-D__STDC_LIMIT_MACROS -D__STDC_CONSTANT_MACROS -MD -MP -DIN_GCC
-DREVISION=\"100909M\"
-DTARGET_NAME=\"x86_64-apple-darwin10.3.0\"
-I/Users/howarth/llvm_svn/dragonegg -Iplugin/include -Wall -Werror
-I/sw/lib/llvm/include  -D_DEBUG -D_GNU_SOURCE -D__STDC_LIMIT_MACROS
-D__STDC_CONSTANT_MACROS -O2  -fno-exceptions -fno-rtti -fno-common
-Woverloaded-virtual /Users/howarth/llvm_svn/dragonegg/utils/target.cpp
> <command-line>: error: "__STDC_LIMIT_MACROS" redefined
> <command-line>: error: this is the location of the previous
definition
> <command-line>: error: "__STDC_CONSTANT_MACROS" redefined
> <command-line>: error: this is the location of the previous
definition
> make: *** [target.o] Error 1
>
> with GCC apparently being insufficent to redirect the compilers. Instead, I
had to use...
>
> GCC=/sw/bin/gcc-4 CC=/sw/bin/gcc-4 CXX=/sw/bin/g++-4
LLVM_CONFIG=/sw/lib/llvm/bin/llvm-config make
That's correct.  There is no need to build dragonegg with gcc-4.5; gcc-4.5
is
the target of the plugin, which is different.  You inform the makefile that the
plugin is for gcc-4.5 using "GCC=...", and as usual you say what
compiler to use
to build dragonegg using CC/CXX.
>
> This however fails with...
>
> /sw/bin/gcc-4 -c  -I/sw/lib/llvm/include  -D_DEBUG -D_GNU_SOURCE
-D__STDC_LIMIT_MACROS -D__STDC_CONSTANT_MACROS -MD -MP -DIN_GCC
-DREVISION=\"100909M\"
-DTARGET_NAME=\"x86_64-apple-darwin10.3.0\"
-I/Users/howarth/llvm_svn/dragonegg -Iplugin/include
-I/Users/howarth/llvm_svn/dragonegg/x86
-I/Users/howarth/llvm_svn/dragonegg/darwin -Wall -Werror -I/sw/lib/llvm/include 
-D_DEBUG -D_GNU_SOURCE -D__STDC_LIMIT_MACROS -D__STDC_CONSTANT_MACROS -O2 
-fno-common /Users/howarth/llvm_svn/dragonegg/llvm-cache.c
> In file included from /Users/howarth/llvm_svn/dragonegg/llvm-cache.c:28:0:
> /Users/howarth/llvm_svn/dragonegg/llvm-cache.h:31:20: fatal error:
config.h: No such file or directory
This is a gcc-4.5 "plugin header file".  You can ask gcc where to find
these by
doing:

   /sw/bin/gcc-4 -print-file-name=plugin

On my machine this returns

   /usr/local/gnat-fsf/lib/gcc/x86_64-unknown-linux-gnu/4.5.0/plugin

I suspect that your gcc-4.5 was built without plugin support, and that
because of this you aren't getting a path here.
> If I manually run /sw/lib/llvm/bin/llvm-config, I get...
These aren't llvm headers, so llvm-config is not relevant here.

Ciao,

Duncan.

Jack Howarth

2010-Apr-11 01:01 UTC

head link

[LLVMdev] darwin dragon-egg build issues

On Sat, Apr 10, 2010 at 01:52:18PM +0200, Duncan Sands
wrote:> Hi Jack,
> 
> >     Is anyone building dragon-egg on darwin?
> 
> Anton built it once.  There were some problems with dynamic libraries:
gcc's
> plugin support requires the use of dynamic libraries, and the configure
logic
> it uses thinks that darwin does not support dynamic libraries!  So it is
> possible that plugin support was automatically disabled because of this. 
Try
> configuring with --enable-plugin
> 
Duncan,
   The following hack to gcc/configure.ac will allow the --enable-plugin option
to build and pass
the plugin tests on x86_64-apple-darwin10 using gcc-4_5-branch...

--- configure.ac.orig   2010-04-10 10:58:34.000000000 -0500
+++ configure.ac        2010-04-10 10:59:52.000000000 -0500
@@ -4380,22 +4380,6 @@
 
 pluginlibs if test x"$enable_plugin" = x"yes"; then
-
-  AC_MSG_CHECKING([for exported symbols])
-  echo "int main() {return 0;} int foobar() {return 0;}" >
conftest.c
-  ${CC} ${CFLAGS} ${LDFLAGS} conftest.c -o conftest > /dev/null 2>&1
-  if $gcc_cv_objdump -T conftest | grep foobar > /dev/null; then
-    : # No need to use a flag
-  else
-    AC_MSG_CHECKING([for -rdynamic])
-    ${CC} ${CFLAGS} ${LDFLAGS} -rdynamic conftest.c -o conftest > /dev/null
2>&1
-    if $gcc_cv_objdump -T conftest | grep foobar > /dev/null; then
-      pluginlibs="-rdynamic"
-    else
-      enable_plugin=no
-    fi
-  fi
-
   # Check -ldl
   saved_LIBS="$LIBS"
   AC_SEARCH_LIBS([dlopen], [dl])
@@ -4403,29 +4387,6 @@
     pluginlibs="$pluginlibs -ldl"
   fi
   LIBS="$saved_LIBS"
-
-  # Check that we can build shared objects with -fPIC -shared
-  saved_LDFLAGS="$LDFLAGS"
-  LDFLAGS="$LDFLAGS -fPIC -shared"
-  AC_MSG_CHECKING([for -fPIC -shared])
-  AC_TRY_LINK(
-    [extern int X;],[return X == 0;],
-    [AC_MSG_RESULT([yes]); have_pic_shared=yes],
-    [AC_MSG_RESULT([no]); have_pic_shared=no])
-  if test x"$have_pic_shared" != x"yes" -o
x"$ac_cv_search_dlopen" = x"no"; then
-    pluginlibs-    enable_plugin=no
-  fi
-  LDFLAGS="$saved_LDFLAGS"
-
-  # If plugin support had been requested but not available, fail.
-  if test x"$enable_plugin" = x"no" ; then
-    if test x"$default_plugin" != x"yes"; then
-      AC_MSG_ERROR([
-Building GCC with plugin support requires a host that supports
--fPIC, -shared, -ldl and -rdynamic.])
-    fi
-  fi
 fi
 
 AC_SUBST(pluginlibs)

Index: gcc/testsuite/lib/plugin-support.exp
==================================================================---
gcc/testsuite/lib/plugin-support.exp	(revision 158195)
+++ gcc/testsuite/lib/plugin-support.exp	(working copy)
@@ -88,6 +88,10 @@
 
     set optstr "$includes $extra_flags -DIN_GCC -fPIC -shared"
 
+    if { [ istarget *-*-darwin* ] } {
+        set optstr [concat $optstr "-undefined dynamic_lookup"]
+    }
+
     # Temporarily switch to the environment for the plugin compiler.
     restore_ld_library_path_env_vars
     set status [remote_exec build "$PLUGINCC $PLUGINCFLAGS $plugin_src
$optstr -o $plugin_lib"]

I am working towards building current dragon-egg svn against this
installation of FSF gcc 4.5.0. Currently FSF gcc 4.5.0 neglects to install
gcc/config/darwin-sections.def into
lib/gcc/x86_64-apple-darwin10.3.0/4.5.0/plugin/include/
so I copied that manually for now. With that change, I think I am bumping
into a bug with building dragon-egg with gcc 4.5.0...

bash-3.2$ GCC=/sw/bin/gcc-4 CC=gcc-4 CXX=g++-4 CFLAGS=-I/sw/include
CXXFLAGS=-I/sw/include LLVM_CONFIG=/sw/lib/llvm/bin/llvm-config make
g++-4 -c  -I/sw/lib/llvm/include  -D_DEBUG -D_GNU_SOURCE -D__STDC_LIMIT_MACROS
-D__STDC_CONSTANT_MACROS -MD -MP -DIN_GCC -DREVISION=\"100954M\"
-DTARGET_NAME=\"x86_64-apple-darwin10.3.0\"
-I/Users/howarth/llvm_svn/dragonegg
-I/sw/lib/gcc4.5/lib/gcc/x86_64-apple-darwin10.3.0/4.5.0/plugin/include
-I/Users/howarth/llvm_svn/dragonegg/x86
-I/Users/howarth/llvm_svn/dragonegg/darwin -I/sw/include -Wall -Werror
-I/sw/lib/llvm/include  -D_DEBUG -D_GNU_SOURCE -D__STDC_LIMIT_MACROS
-D__STDC_CONSTANT_MACROS -O2  -fno-exceptions -fno-rtti -fno-common
-Woverloaded-virtual /Users/howarth/llvm_svn/dragonegg/llvm-convert.cpp
In file included from /Users/howarth/llvm_svn/dragonegg/llvm-convert.cpp:88:0:
/Users/howarth/llvm_svn/dragonegg/llvm-debug.h:150:3: error: ‘DIFile’ does not
name a type
make: *** [llvm-convert.o] Error 1

where /sw/bin/gcc-4 is the gcc 4.5.0 from my gcc45 fink package
with plugin support. Do you see this under linux?
              Jack

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