PCH Support

[Helge Hess]

Hi,

I've added some PCH support to gstep-make 1.11.0 and I'm almost ready 
to send it for inclusion. At least on OSX it gives a major performance 
boost (compilation of libSaxObjC in 13s instead of 23s on a G4/800MHz).

Problem is, it only works completely on OSX (only checked 10.4 so far). 
On Linux, gcc 4.0.2 seems to be able to compile the header but I get 
errors when trying to use it with a source file.

OSX, works fine:
---snip---
address@hidden make messages=yes all
Making all for library libSaxObjC...
cd .; \
/Users/helge/dev/SOPE-4.5-gs/.gsmake/Library/Makefiles/mkinstalldirs 
./shared_debug_obj; \
rm -f obj; \
ln -s ./shared_debug_obj obj
if ! test -d ./derived_src; then \
  /Users/helge/dev/SOPE-4.5-gs/.gsmake/Library/Makefiles/mkinstalldirs 
./derived_src; \
fi
gcc -x objective-c-header common.h -c \
      -MMD -MP -pipe -Wall -Wno-protocol -Wall 
-DCOMPILE_FOR_GSTEP_MAKE=1 -DSOPE_MAJOR_VERSION=4 
-DSOPE_MINOR_VERSION=5 -DSOPE_SUBMINOR_VERSION=52 -Wno-protocol 
-DNeXT_Foundation_LIBRARY=1 -DNeXT_RUNTIME=1 -dynamic -fno-common -g 
-Wall -DDEBUG -fno-omit-frame-pointer -DGSWARN -DGSDIAGNOSE 
-fno-strict-aliasing -fnext-runtime -I.. -I. \
       -o derived_src/common.h.gch
gcc SaxAttributeList.m -c \
      -MMD -MP -pipe -Wall -Wno-protocol -Wall 
-DCOMPILE_FOR_GSTEP_MAKE=1 -DSOPE_MAJOR_VERSION=4 
-DSOPE_MINOR_VERSION=5 -DSOPE_SUBMINOR_VERSION=52 -Wno-protocol 
-DNeXT_Foundation_LIBRARY=1 -DNeXT_RUNTIME=1 -dynamic -fno-common -g 
-Wall -DDEBUG -fno-omit-frame-pointer -DGSWARN -DGSDIAGNOSE 
-fno-strict-aliasing -fnext-runtime -I.. -I. \
      -include ./derived_src/common.h \
       -o shared_debug_obj/SaxAttributeList.o
...
---snap---

Linux:
---snip---
address@hidden:~/dev/SOPE-4.5/sope-xml/SaxObjC$ make messages=yes
Making all for library libSaxObjC...
cd .; \
/home/helge/GNUstep/Library/Makefiles/mkinstalldirs ./shared_debug_obj; 
\
rm -f obj; \
ln -s ./shared_debug_obj obj
if ! test -d ./derived_src; then \
  /home/helge/GNUstep/Library/Makefiles/mkinstalldirs ./derived_src; \
fi
gcc -x objective-c-header common.h -c \
      -pipe -Wall -Wno-protocol -Wall -DCOMPILE_FOR_GSTEP_MAKE=1 
-DSOPE_MAJOR_VERSION=4 -DSOPE_MINOR_VERSION=5 
-DSOPE_SUBMINOR_VERSION=52 -Wno-protocol 
-I/home/helge/GNUstep/Library/Headers/libFoundation/ix86/linux-gnu/GNU 
-DGNUSTEP=1 -DWITH_GSTEP_MAKE=1 -DLIB_FOUNDATION_LIBRARY=1 
-DFD_WITH_GSMAKE=1 -DGNUSTEP=1 -DGNU_RUNTIME=1 -D_REENTRANT -fPIC -g 
-Wall -DDEBUG -fno-omit-frame-pointer -DGSWARN -DGSDIAGNOSE 
-fno-strict-aliasing -fgnu-runtime -I.. -I. 
-I/home/helge/GNUstep/Library/Headers 
-I/home/helge/GNUstep//Library/Headers 
-I/home/helge/GNUstep/Library/Headers/libFoundation 
-I/home/helge/GNUstep//Library/Headers/libFoundation 
-I/home/helge/GNUstep//Library/Headers/libFoundation 
-I/home/helge/GNUstep/Library/Headers/libFoundation 
-I/home/helge/GNUstep/Library/Headers/libFoundation/./GNU 
-I/home/helge/GNUstep//Library/Headers/libFoundation/./GNU 
-I/home/helge/GNUstep//Library/Headers/libFoundation/./GNU 
-I/home/helge/GNUstep/Library/Headers/libFoundation/./GNU \
       -o derived_src/common.h.gch
gcc SaxAttributeList.m -c \
      -pipe -Wall -Wno-protocol -Wall -DCOMPILE_FOR_GSTEP_MAKE=1 
-DSOPE_MAJOR_VERSION=4 -DSOPE_MINOR_VERSION=5 
-DSOPE_SUBMINOR_VERSION=52 -Wno-protocol 
-I/home/helge/GNUstep/Library/Headers/libFoundation/ix86/linux-gnu/GNU 
-DGNUSTEP=1 -DWITH_GSTEP_MAKE=1 -DLIB_FOUNDATION_LIBRARY=1 
-DFD_WITH_GSMAKE=1 -DGNUSTEP=1 -DGNU_RUNTIME=1 -D_REENTRANT -fPIC -g 
-Wall -DDEBUG -fno-omit-frame-pointer -DGSWARN -DGSDIAGNOSE 
-fno-strict-aliasing -fgnu-runtime -I.. -I. 
-I/home/helge/GNUstep/Library/Headers 
-I/home/helge/GNUstep//Library/Headers 
-I/home/helge/GNUstep/Library/Headers/libFoundation 
-I/home/helge/GNUstep//Library/Headers/libFoundation 
-I/home/helge/GNUstep//Library/Headers/libFoundation 
-I/home/helge/GNUstep/Library/Headers/libFoundation 
-I/home/helge/GNUstep/Library/Headers/libFoundation/./GNU 
-I/home/helge/GNUstep//Library/Headers/libFoundation/./GNU 
-I/home/helge/GNUstep//Library/Headers/libFoundation/./GNU 
-I/home/helge/GNUstep/Library/Headers/libFoundation/./GNU \
      -include ./derived_src/common.h \
       -o shared_debug_obj/SaxAttributeList.o
SaxAttributeList.m:188: error: redefinition of 'struct _objc_symtab'
SaxAttributeList.m:188: error: redefinition of 'struct _objc_module'
SaxAttributeList.m:188: error: redefinition of '__objc_gnu_init'
common.h:26: error: previous definition of '__objc_gnu_init' was here
{standard input}: Assembler messages:
{standard input}:2136: Error: symbol `_OBJC_SYMBOLS' is already defined
{standard input}:2302: Error: symbol `_OBJC_MODULES' is already defined
{standard input}:2351: Error: symbol `_OBJC_CLASS_NAME_0' is already 
defined
...
address@hidden:~/dev/SOPE-4.5/sope-xml/SaxObjC$ file derived_src/common.h.gch
derived_src/common.h.gch: GCC precompiled header (version 012) for 
Objective C
---snap---


Does someone know whether PCH is fully implemented in the GNU gcc? Any 
hints?

Thanks,
  Helge
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