Some new features in this version are:
* Support for C99 designated initializers has been added to the C
compiler, for example "struct {int a, b;} c = {.a=0, .b=1};". This is
also supported for arrays, for example "int a[4] = {[0]=5, [3]=2};".
* Handling of enumerations has been fixed in the C compiler. In
certain cases, the compiler chose the wrong type for operations on
objects of enumerated types. Enumerated constants up to 64 bits wide
are now also allowed (including in 16-bit compilers).
* The C compiler will now warn if the right hand operand of a bitwise
shift expression is a constant that is either negative or greater than
or equal to the bit with of the promoted left operand. The result of
such operation is not defined by ISO C. The warnings are 'W134:
Shift amount negative' and 'W135: Shift amount too large'.
* The C compiler now warns in cases where an unsigned type is compared
for <= 0. This is equivalent to 'unsigned == 0' and often indicates
that a signed comparison was intended.
* New __watcall keyword has been added to the C and C++ compilers to
designate the default Watcom calling convention.
* New -ec? switches have been added to set the default calling convention.
* The 16-bit C compiler now defines _M_I86 macro for consistency with
the C++ compiler. The new macro should be used in preference to the
existing M_I86.
* A number of new keywords have been added to the C compiler; these
were previously defined as macros: _Cdecl, _Export, _Far16,
_Fastcall, _Pascal, __sycall, _System, __try, __except, __finally,
__leave.
* Analogous change has been made to the C++ compiler. The new
keywords (and removed predefined macros) are: _Cdecl, _Export,
_Far16, _Fastcall, __inline, _Pascal, __syscall, _System.
* The C++ compiler now handles the "new" template specialization
syntax, and partial specialization is partially supported (no pun
intended).
* The C++ compiler now correctly handles the situation where control
reaches the end of main() function without encountering a return
statement. In that case, the effect is that of executing "return 0;".
* The C++ compiler now properly allows return statements with a void
expression in functions that return void.
* 386 C and C++ compilers now support the Microsoft fastcall calling
convention, and recognize the __fastcall keyword.
* The C compiler now recognizes #pragma data_seg and code_seg forms
that specify segment and class names without enclosing them in
parentheses. The new behaviour is consistent with other compilers.
* New -fti switch has been added to the C compiler to track #include
file opens. This helps diagnose include file problems in complex
projects.
* The code generator no longer emits debug information for
unreferenced typedefs when -d1+ or -d2 switch is used. This produces
slightly to significantly smaller debug information. Note that
behaviour of -d3 is unchanged.
* The 386 code generator will no longer select the 'and' instruction
to perform zero extension when optimizing for time on the 686
architecture (-6r or -6s switch). The 'movzx' instruction will always
be used instead, because it avoids partial register stalls and in
certain cases significantly improves performance on P6 and newer class
CPUs.
* Support for long long based bitfields has been improved in the code generator.
* The code generator now properly diagnoses attempts to emit symbol
names that overflow the OMF limit (255 bytes).
* Several problems related to loss of segment information in 386
non-flat models have been fixed in the code generator.
* Command line processing has been changed in the Compile and Link
utility (wcl). Forward slashes now may be used as path separators in
file arguments, such that "foo/bar" is now interpreted as "foo\bar.c".
Note that this does not affect options delimited with forward
slashes.
* Support for raw binary and Intel Hex output has been added to the
linker, along with support for 24-bit segmented addressing
architectures (HSHIFT option) and arbitrary class/segment reordering
(OUTPUT and ORDER directives). See Linker Guide for details.
* Support for overlays (16-bit DOS) has been reinstated in the linker.
A related FARCALLS/NOFARCALLS option has been added to the linker.
See Linker Guide for details.
* The linker now correctly processes relocations to symbols in
absolute segments.
* The linker now checks for bitness conflicts (16 vs. 32-bit) when
adding segments to a group.
* The minimum accepted value for linker OBJALIGN option has been
changed to 16 bytes (previously 512).
* The st_name member was removed from struct stat and related
structures. This was done for consistency across platforms (UNIX has
no such field), because the st_name field was almost entirely useless
(being limited to 13 characters), and for compatibility with Microsoft
compilers; the latter because struct _wstat and struct _wstati64 are
now obsolete and struct _stat/_stati64 can be used for wide character
stat functions. NB: This change requires recompilation. New object
files will not work with old libraries and vice versa.
* The e/E format of printf() family of functions has been changed to
format the exponent with minimum of two digits (instead of three).
This behaviour is dictated by C99 and consistent with most other
compilers.
* The floating-point to string conversion routines now format values
with greater precision. This means that floating-point values printed
by C and C++ programs may be slightly different from earlier versions
of the runtime libraries (but more accurate).
* The sleep() function is now declared in unistd.h and its return type
has been changed to unsigned int, for compatibility with POSIX.
* The clock() function now uses millisecond counters (where available)
on DOS and Windows, and is no longer susceptible to problems related
to TZ changes.
* The DOS runtime has been tuned to produce smaller executables.
* C99 functions wmemchr(), wmemcmp(), wmemcpy(), wmemmove(), and
wmemset() have been added to the C runtime library.
* A POSIX compatible getopt() function has been added to the C runtime library.
* A POSIX compatible mkstemp() function has been added to the C runtime library.
* BSD compatible safe string copy and concatenation functions,
strlcpy() and strlcat(), have been added. Use of these functions is
highly recommended over strncpy() and strncat(), because they are
safer and much easier to use.
* New strings.h header has been added for POSIX compatibility,
although legacy functions index() and rindex() are not supported.
Functions strcasecmp() and strncasecmp() are also declared in string.h
for compatibility with other compilers.
* The C runtime library no longer returns ESPIPE when calling write()
on a pipe or device that was opened with O_APPEND flag. The old
behaviour was not POSIX conforming.
* Handling of pathnames that include spaces has been improved in the
make utility (wmake).
* The disassembler (wdis) now handles big endian object files on
little endian host platforms, and vice versa.
* Support for MIPS R4000 and SPARC V8 instruction sets has been added
to the disassembler.
* New -zz and -zzo option have been added to the assembler (wasm) for
backwards compatibility. See Tools User's Guide for details.
* Default behaviour of inline assembler has changed. The CPU
optimization level (-4, -5, -6) now implies the available instruction
set: -5 implies MMX and 3DNow!, -6 also implies SSE/SSE2/SSE3. Also
note that any CPU setting override now reverts to default at the end
of each inline assembly block.
* 16-bit DOS version of the assembler (wasmr) has been added. This
version runs on 8086 and above and requires less memory than the
protected mode version.
* The debugger has been changed to look for support files in
directories relative to the debugger executable's location. This
allows the debugger to be used when no debugger specific environment
variables have been set.
* A problem with stepping into code (F8) right after debuggee was
loaded has been fixed in the debugger.
* The debugger now looks for debug information in a .sym file when the
/DOwnload option was specified. Previously it erroneously only looked
at the executable if the download option was used.
* The CauseWay trap file no longer incorrectly maps symbol addresses
in 'large' executables (code segment > 64K).
* Interoperability with GNU tools has been improved. The debugger
(wd/wdw) should now be able to debug GNU-produced executables (with
DWARF 2 debug information) and vice versa.
* New exe2bin utility has been added. See Tools User's Guide for details.
* The include search order in the resource compiler has been changed
to be more consistent with the C/C++ compilers, as well as with IBM's
and Microsoft's resource compilers. System include files (enclosed in
angle brackets) are no longer searched in current directory or in the
dicrectory of the file containing the #include directive.
* The MS LINK compatibility wrapper now supports a /RELEASE switch.
* Several new DOS extender related targets have been added to the IDE.
Better support for remote debugging has also been added to the IDE.
* The CauseWay DOS extender now supports SSE instructions on plain DOS.
And of course an experimental linux target added to the compiler.
--
Fall is my favorite season in Los Angeles, watching the birds change
color and fall from the trees.
David Letterman (1947 - )
See ya
-------------------------------------------------------
This SF.net email is sponsored by: Splunk Inc. Do you grep through log files
for problems? Stop! Download the new AJAX search engine that makes
searching your log files as easy as surfing the web. DOWNLOAD SPLUNK!
http://ads.osdn.com/?ad_idv37&alloc_id865&op=click
_______________________________________________
Freedos-devel mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/freedos-devel
