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Knowing compile-time options within source code?
Is there a way to tell which compiler options have been specified on the command line, so as to take appropriate action or issue warnings?   I'm interested in know whether "-...
Mon. Nov 5, 2018 - 03:10 AM
MPLABX first users
Split form here JS https://www.avrfreaks.net/commen...   Copy of a message I sent off to AVRSupport@microchip (as they request for people trying to use MPLAB for AVR):...
Mon. Oct 8, 2018 - 10:08 AM
avr-gcc weird (non)optimization
This is avr-gcc (AVR_8_bit_GNU_Toolchain_3.6.1_495) 5.4.0 Edit: It's an ATmega4809, with those new-fangled structure-based IO register definitions.   Supposed I am "somehow"...
Mon. Oct 8, 2018 - 12:53 AM
Optiboot version 8.0 release
Optiboot version 8 is available. The major points relevant to Arduino users include: Cleanup of the MCUSR (reset reason) behavior. Ability to jump to the bootloader "as a service...
Tue. Sep 25, 2018 - 12:31 AM
Weird optimization failure (SAMD21 CM0 gcc)
arm gcc (the version in the Arudino package; relatively recent)   // the pin is not an output, disable pull-up if val is LOW, otherwise enable pull-up volatile...
Tue. Sep 4, 2018 - 05:57 AM
avr-gcc optimization of call-used registers...
Call-used registers (r18-r27, r30-r31): May be allocated by gcc for local data. You may use them freely in assembler subroutines. Calling C subroutines can clobber any of them -...
Thu. Aug 9, 2018 - 12:45 AM
External Recursive Makefile fails on Win64
Recursive makefiles are relatively common. For example, for the optiboot bootloader "make xplained168pb" invokes a target that does "$(MAKE) atmega168 BAUD_RATE=57600"   $(...
Fri. Jul 27, 2018 - 01:38 AM
ARM GCC for Cortex-M4F and double-precision floats
Do the arm gcc libraries for double precision floating point use the single-precision FP hardware present on an M4F? I'm getting benchmark results that seem to say "no"...  ...
Sun. Jul 22, 2018 - 09:26 PM
Device Family Packs are annoying...
I really don't want to have to type:    avr-gcc -mmcu=atmega328pb -B /home/packs/Atmel.ATmega_DFP.1.0.86/gcc/dev/atmega328pb/ -I /home/packs/Atmel.ATmega_DFP.1.0.86/...
Fri. Jul 20, 2018 - 11:30 AM
Multiple targets for an AS project?
Is there a standard, preferred, way to set up a project so that it can be compiled for more than one (similar) chip? Say I have a bootloader that will compile for ATmega88*,...
Fri. Jul 20, 2018 - 05:40 AM
avr-gcc -flto bug, maybe because weak symbols that eval. to zero?
(also sent to avr-gcc-list mailing list)   Discovered on Arduino (4.9.2-atmel3.5.4) ( http://forum.arduino.cc/index.php?topic=556674.0 ) So I have this pretty trivial avr-gcc...
Sat. Jul 7, 2018 - 01:19 AM
Compiler bug - with LTO only?
The arduino folk seem to have found a compiler bug, that occurs only when using link-time-optimization.   http://forum.arduino.cc/index.ph... How do you even collect...
Fri. Jul 6, 2018 - 10:02 AM

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