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1999-03-08
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The following small changes (apart from those in ChangeLog's) have been made
to PGCC+EMX relatively to GCC+EMX 2.7.2.1 (unordered):
o PGCC has NO bound checking.
o The symbol __OS2__ is defined if -Zomf is used.
o I've removed some of Eberhard Mattes' patches that were related to 8.3
naming convention. FAT is ugly, besides you mostly won't have any problems
with 8.3 names even without these patches. They were related mostly to
GCC-developer related things, like .cse2, .flow, .combine, .sched and
other file name extensions. If you need these files, you should use
a normal filesystem :-)
o The -ZC++-comments switch is gone now (hopefully forever) since GCC
always enable C++-style comments (unless -traditional or -lang-c89 is
specified)
o The -Zexe switch now works correctly (before it worked only in couple
with -o switch). ld and emxomfld were patched too for this. Also now
the -Zexe option not only creates a fresh file without extension
to keep "make" happy; the behaviour has been changed to copy a file
called ldstub.bin that should be located in same directory where
ld or emxomfld is into the file with same name as executable but without
extension: this avoids two problems at once: first, many "configure"
scripts expects after compiling a test program to obtain a *non-empty*
file; and second, they expect the file to be runnable, otherwise C compiler
is considered a cross-compiler. ldstub determines the name under which
it has been launched and launches in turn the executable that has same
name but with ".exe" appended. So, for example, if you copy ldstub.bin
into "sh" then when you do from, say, bash:
[c:/] ./sh
you will launch "sh" which in turn will look for "sh.exe" (located in
same directory as "sh" itself) and will run it.
o All compilers were compiled with -Zcrtdll, so you will need an
installed EMX runtime to run them. Anyway, I think everybody reading
this already have it :-)
o The -mprobe switch is retained for backward compatibility, however it
is highly recommended that you use -mstack-arg-probe and -mno-stack-arg-probe
instead since these options are new from mainstream GCC version, and maybe
someday -mprobe will disappear.
Another switch that has to do with stack probing is -f{no-}stack-check.
These switches have same functionality as -m{no-}stack-arg-probe but uses
inline instructions instead of alloca call, so they're faster. Here is how
alloca(20000) is compiled with different switches:
without any switches:
subl $20000,%esp
with -mstack-arg-probe:
movl $20000,%eax
call __alloca
with -fstack-check options:
movl $0,-4392(%esp)
movl $0,-8488(%esp)
movl $0,-12584(%esp)
movl $0,-16680(%esp)
movl $0,-24392(%esp)
addl $-20000,%esp
o Now alloca() is stack-probe safe, i.e. if you`re compiling with
-mstack-arg-probe switch, alloca() will do stack probes.
o 64-bit ([signed & unsigned] long long) division is now FAST! :-) Its written
in assembly now, and I`ve optimized them by hand.
o -mepilogue did not worked in C++ and possibly other languages which mangles
names. Fixed.
o _set_new_handler now is called set_new_handler. However, _set_new_handler
will work too as an alias.
o There is a new optional environment variable: CLH_TERM.
If GCC was compiled with built-in command-line help system (try gcc --help)
this variable will be used (or TERM as a fallback) to find the corresponding
entry in TERMCAP file to highlight command-line help. I've included my
TERMCAP file in this directory as a example. I'm using 'SET TERM=OS2'.
If CLH_TERM is equal to '-' (i.e. SET CLH_TERM=-) command-line help will
not be colored.
o Libgcc has been put in a separate DLL. This happened because libgcc changes
often - with each new major gcc release, sometimes even in minor releases.
To avoid conflicts with future/previous libgcc versions, libgcc will have
a name consisting of 'gcc' and gcc's internal version number without dots.
For example, gcc version 2.90.27 will have its runtime in gcc29027.dll.
Known bugs and limitations:
o Exceptions in C++ currently are single-threaded. This means you cannot
throw in two threads at the same time, otherwise you'll crash.
o emxomf now traps (sometimes?) when compiling with -g (debug) switch.
o f77 compiler does not incorporate the changes made for the `main' ported
version for OS/2. I do not know whenever there are other changes other than
those needed `just to make it work'.
--------------------------------------------------------------------------------
PGCC/2 change history
--------------------------------------------------------------------------------
(*) pgcc-1.1.1
- Upgraded to pgcc 1.1.1
- Upgraded to emx 0.9d: PGCC will not work anymore with emx 0.9c.
- Now command-line help works without termcap; this is better since it
achieves consistent results across different termcap files (the one that
comes with emx works not too well with CLH). The CLH_TERM variable
can be assigned three different values: "-" for non-colored output,
"mono" for monochrome output and anything other (or unset) for colored
output.
- Exceptions will work from now ONLY if you will link with g++ and ONLY
if you did not used -fno-exceptions during linking. Otherwise a different
version of libgcc is used that has smaller size overhead (~10K) by the
cost of exception handling.
(*) pgcc-1.0.2 release 2 - minor bugfixes
- Re-compiled ld.exe and emxomfld.exe to not use gcc290.dll from pgcc-1.0.0
- Changed front-end to pre-define __OS2__ symbol when using -Zomf
- Fixed an inconsistency between ld and emxomfld: ld used ldstub.bin when
run with -Zexe while emxomfld searched for ldstub.bin. Now the "launcher"
stub is always called ldstub.bin.
- minor bug in emxfix.cmd: lib/st and lib/mt already exists, so there is
no need to create them.
- New libraries: gpp*.a (which have almost the same functionality as their
gcc*.a counterparts). I was forced to split g++ runtime from gcc runtime
since g++ when used with frame-unwind exceptions required a slightly longer
initialization sequence which pulls a lot of unused code into executables,
even for plain C and F77 not speaking of C++ code without exceptions.
So I suggest now linking with gcc even C++ code without exceptions -
this will produce slightly smaller executables (5-10K).
- Fixed the bug with creating a ".exe" file when feeding only linker
files to frontent (ex: gcc -s a.o b.o c.o will produce ".exe").
Now it takes the basename of first object file and appends .exe or .dll.
(*) pgcc-1.0.2
- Upgraded to egcs-1.0.2.
- Ooops! Due to a bug in my makefiles, libgcc previously used C versions
of some functions instead of optimized versions I wrote in
config/i386/emx-libgcc1.asm. 64-bit division should be slightly faster
now.
- Renamed dynamically-loaded libgcc from gcc290.dll to gcc29027.dll.
This happened because libgcc in pgcc-1.0.2 has been changed, to
avoid conflicts with previous versions of gcc*.dll.
- Added include/cpp/new, include/cpp/exception, include/cpp/typeinfo files.
I don't really know what they are for :-) I don't use libstdc++.
- Included GNU -liberty library into base PGCC/2 binary distribution.
The files added were:
- libiberty.h - mostly interface for string functions in libiberty
- objalloc.h - obstack management
- obstack.h - same
- getopt.h - GNU getopt (getopt_long included too).
Replaces EMX's getopt.h
- demangle.h - C++/Java name demangling functions
- fnmatch.h - Wildcard filename match function
Replaces EMX's fnmatch.h
- ansidecl.h - auxiliary file
- iberty.a - static library
- ibertydll.a - import library
- iberty.dll - dynamic library
To link against static version of GNU -liberty library use:
gcc [...] -liberty
To link against dynamic version of GNU -liberty library use:
gcc [...] -libertydll
iberty.dll should be on your LIBPATH (and distributed with your
programs, if used). Distribution policy is contained in file COPYING.
(*) pgcc-1.0 release 2
- multi-threaded and single-threaded libstdc++ library!
- fixed a bug with _IO_flockfile and _IO_funlockfile in libstdc++
- fixed a number of minor bugs in supplied header files
- removed limits.h - emx's is good enough
- removed float.h - emx's is good enough
- removed sysinclude.h which is garbage
- removed proto.h which is garbage
- fixed a definition conflict with emx headers in
varargs.h and stdarg.h
- changed behaviour of command-line help. Now by default "gcc -h"
will list a digest of most used GCC options. To see the full help
index use gcc -h* or gcc --help=*
(*) pgcc-1.0 release 1
This was the first release of pgcc-1.0 for OS/2