|
|
| (34 intermediate revisions by 11 users not shown) |
| Line 1: |
Line 1: |
| == gcc ==
| | {{header|docs}} |
| | |
| Fedora 14 includes version 4.5 of '''gcc''' and the various compilers which depend on gcc. The full details of the changes my be found at http://gcc.gnu.org/gcc-4.5/changes.html, but some main points follow.
| |
| | |
| === Obsoleted support and features ===
| |
| | |
| The following ports for individual systems on particular architectures have been obsoleted:
| |
| | |
| * IRIX releases before 6.5 (mips-sgi-irix5*, mips-sgi-irix6.[0-4])
| |
| * Solaris 7 (*-*-solaris2.7)
| |
| * Tru64 UNIX releases before V5.1 (alpha*-dec-osf4*, alpha-dec-osf5.0*)
| |
| * Details for the IRIX, Solaris 7, and Tru64 UNIX obsoletions can be found in the announcement.
| |
| * Support for the classic POWER architecture implemented in the original RIOS and RIOS2 processors of the old IBM RS/6000 product line has been obsoleted in the rs6000 port. This does not affect the new generation Power and PowerPC architectures.
| |
| | |
| Support has also been removed for a number of features obsoleted in 4.4.
| |
| | |
| {{admon/warning|On x86 targets, code containing floating-point calculations may run significantly slower when compiled with GCC 4.5 in strict C99 conformance mode than they did with earlier GCC versions.|This is due to stricter standard conformance of the compiler and can be avoided by using the option <code>-fexcess-precision=fast</code>.}} | |
| | |
| === Optimizer improvements ===
| |
| | |
| * The -save-temps now takes an optional argument. The <code>-save-temps</code> and <code>-save-temps=cwd</code> switches write the temporary files in the current working directory based on the original source file. The <code>-save-temps=obj</code> switch will write files into the directory specified with the <code>-o</code> option, and the intermediate filenames are based on the output file.
| |
| * Debugging dumps are now created in the same directory as the object file rather than in the current working directory.
| |
| * A new link-time optimizer has been added (<code>-flto</code>). When this option is used, GCC generates a bytecode representation of each input file and writes it to special ELF sections in each object file.
| |
| * The automatic parallelization pass was enhanced to support parallelization of outer loops.
| |
| * GCC now optimize exception handling code.
| |
| | |
| Reference the changes page above for more details on these and other optimizations.
| |
| | |
| === Language-specific improvements ===
| |
| | |
| There are new language-specific features for Ada, C, C++, Fortran and Java.
| |
| | |
| === New targets ===
| |
| | |
| There are new target processors within the AIX, ARM, AVR, IA32, M68K, MeP, MIPS, RS/6000 and RX processor families.
| |
| | |
| === Installation Changes ===
| |
| | |
| The move to autotools has resulted in some artifacts changing the directories where they are found. For details, as in all of the above details, refer to the changes page.
| |
|
| |
|
| | {{Docs_beat_closed}} |
|
| |
|
| [[Category:Docs Project]] | | [[Category:Docs Project]] |
| [[Category:Draft documentation]] | | [[Category:Draft documentation]] |
| [[Category:Documentation beats]] | | [[Category:Documentation beats]] |
