Mentioning some AVR target specific improvements. Ok?
Index: changes.html =================================================================== RCS file: /cvs/gcc/wwwdocs/htdocs/gcc-7/changes.html,v retrieving revision 1.15 diff -r1.15 changes.html 261c261,299 < <!-- <h3 id="avr">AVR</h3> --> --- > <h3 id="avr">AVR</h3> > <ul> > <li>On the reduced Tiny cores, the <code>progmem</code> > <a href="https://gcc.gnu.org/onlinedocs/gcc/AVR-Variable-Attributes.html";>variable > attribute</a> > is now properly supported. Respective read-only variables are located > in flash memory in section <code>.progmem.data</code>. No special > code is needed to access such variables; the compiler automatically > adds an offset of <code>0x4000</code> to all addresses which is needed > to access variables in flash memory. As opposed to ordinary cores > where it is sufficient to specify the <code>progmem</code> attribute > with definitions, on the reduced Tiny cores the attribute has also to > be specified with (external) declarations: > <blockquote><pre> > extern const int array[] __attribute__((__progmem__)); > > int get_value2 (void) > { > /* Access via addresses array + 0x4004 and array + 0x4005. */ > return array[2]; > } > > const int* get_address (unsigned idx) > { > /* Returns array + 0x4000 + 2 * idx. */ > return &array[idx]; > }</pre></blockquote></li> > <li>A new command line option <code>-Wmisspelled-isr</code> has been added. > It can be used to turn off — or turn into errors — > warnings that are reported for interrupt service routines (ISRs) > which don't follow AVR-LibC's naming convention of prefixing > ISR names with <code>__vector</code>.</li> > <li><code>__builtin_avr_nops(n_nops)</code> is a new > <a href="https://gcc.gnu.org/onlinedocs/gcc/AVR-Built-in-Functions.html";>built-in > function</a> > that inserts <code>n_nops</code> <code>NOP</code> instructions into > the instruction stream. <code>n_nops</code> must be a value known at > compile time.</li> > </ul>
