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

From: Georg-Johann Lay
Subject: Re: [avr-gcc-list] avr-gcc 4.7 for Windows
Date: Mon, 01 Oct 2012 23:45:56 +0200
User-agent: Thunderbird (Windows/20100228)

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

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:


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