Re: [avr-gcc-list] avr-gcc 4.7 for Windows

[Georg-Johann Lay]

Parthasaradhi Nayani:
> From:Georg-Johann Lay:
> > GCC 4.7 has just been released, and I decided to provide a MinGW32
> > build of avr-gcc-4.7.2.
> >
> > Many people feel uncomfortable with building the tools to run under
> > MS Windows, so here they are.
> >
> > The package is supplied as a ZIP archive
> > "avr-gcc-4.7.2-mingw32.zip".
> >
> > Unpack the ZIP file to your favorite a location; it will inflate to
> > a directory called "avr-gcc-4.7.2-mingw32".
> >
> > The binaries are located in avr-gcc-4.7.2-mingw32\bin
> >
> > To use the compiler, call avr-gcc-4.7.2-mingw32\bin\avr-gcc.exe
> > directly or add the "avr-gcc-4.7.2-mingw32\bin" to your PATH
> > environment variable.
> >
> > Most notable changes in 4.7.2 compared to 4.7.1 is the support of a
> > new configure option --with-avrlibc that implements a better
> > integration of AVR-Libc with avr-gcc: AVR-Libc supplies optimized
> > versions of support functions that traditionally live in libgcc.
> > --with-avrlibc makes sure that always the optimized versions from
> > AVR-Libc are used.
>
> Hi, Thanks for the post. I noticed some peculiarities in the latest
> version specially regard to FLASH section. The compiler is throwing
> out errors when PROGMEM attribute is provided.
>
> unsigned char PROGMEM P_gu8_nlup[]
>
> dvr.c:205:40: error: variable 'P_gu8_nlup' must be const in order to
> be put into read-only section by means of '__attribute__((progmem))'
>
> The error clears if 'const' is placed before 'PROGMEM'.
>
> unsigned char const PROGMEM P_gu8_nlup[]
>
> Wondering whether there is any change in the latest version.

The change is already in the 4.6 release series, see the 4.6 release
notes and caveats:

http://gcc.gnu.org/gcc-4.6/changes.html#avr