;
#else
PORTB = 1;
#endif
#endif
}
On Fri, Jul 6, 2018 at 6:10 PM, Bill Westfield wrote:
> 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 program:
>
> #include
>
> void serialEven
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 program:
#include
void serialEvent() __attribute__((weak));
void loop();
void serialEventRun(void)
{
#ifndef OMITBUG
if (serialEvent) serialEvent();
#endif
}
They can't be "depended upon" to work, but those examples have had their
code generated carefully examined to ensure that they do work.
Several of the examples are also in the .init3 section, which executes
essentially before C is set up, so they're somewhat free to do what they
want. Some other
I've submitted https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65740
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Another interesting data point or two:
1) This goes back to at least 4.7
2) It's not avr-specific (as you might begin to suspect, given
previous discussion.)
I can get the same sort of bad behavior out of gcc for x86:
BillW-MacOSX-210405 /sw/lib/gcc4.7/bin/g++-fsf-4.7 -c -Os -w foo.cpp
Hmm. Particularly interesting is this series of Considering
paragraphs. about 42 all together (one for each call to move3Servos()
in loop()?)
Considering void move3Servos(Servo, float, Servo, float, Servo, float,
float) with 87 size
to be inlined into void loop() in
Hmm. So I looked at the various command-line parameters other than
-fno-inline-small-functions.
max-inline-insns-singleSeveral ... This only affects functions declared
inline and methods implemented in a class declaration (C++). The default
value is 400.
max-inline-insns-autoWhen you use
Historically, from the avr-gcc 4.3.2 compiler used in Arduino, though
several intermediate versions, the compiler has become more and more
aggressive about in-lining small functions, and has done an
increasingly bad job of detecting small on AVRs (perhaps it bases
its decisions on intermediate
On Jan 26, 2012, at 2:10 PM, Georg-Johann Lay wrote:
I tested the code with avr-gcc 4.5 and command line options -Os -mmcu=atmega8
With the attributes, the object size is 54 bytes.
Without the attributes the object size is 64 bytes.
With 4.5.3 ? Whatever this issue is, it apparently snuck
How does it compile if you change the C code to this?:
[manually factoring out the common code]
Yes, that will fix this particularly obvious instance, but it looks
like gcc is failing to factor out common code like this in less
obvious places as well...
(Hmm. It behaves differently
Ah. Encouraging noises!
This seems stranger than y'all think...
I DO get disassembly; I've just lost the source intermingling. And
only for main(); once the disassembly gets to latter functions, the
source comes back (main() is the only function put in the .init9
section.)
I'll play with some
Ok. By default the code is compiled with -g, which is giving me the
described behavior. I get that same behavior with -gstabs...
If I use -ggdb OR -gdwarf-2, I get correct behavior.
(Isn't -ggdb the default?)
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Using the ubuntu 11 install of avr-gcc/etc (4.5.3) I'm having a problem where
avr-objdump is not including any intermingled source code for the
main() function
of the optiboot .elf or .o files. The same .elf file with
(supposedly) the same version
of binutils (GNU objdump (GNU Binutils)
well, based on my experiences so far, I was expecting an answer of the
form that's this issue here, even though the description doesn't
sound anything alike, or you fool! objdump was never intended to
disassemble the .init9 subsection!
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I am trying to add a version number to my program, to be located at an
absolute flash address.
But it looks like I can't get avr-objcopy to copy the section that I have
put this data in.
I have in my .C file:
asm( .section .version,\x\\n
optboot_version: .word
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