Re: [PATCH 2/5] gnu: Add avr-gcc.

[Danny Milosavljevic]

Hi,

when I apply my patch and then modify my Makefile to also say:

CPPFLAGS += -I${HOME}/.guix-profile/avr/include 
-L${HOME}/.guix-profile/avr/lib/avr5 -L${HOME}/.guix-profile/avr/lib 
-B${HOME}/.guix-profile/avr/lib
CPPFLAGS += -I.. 

then for Arduino (after applying my patch) I still get:

PluggableUSB.cpp:(.text._Z12PluggableUSBv+0xc): undefined reference to 
`__cxa_guard_acquire'
PluggableUSB.cpp:(.text._Z12PluggableUSBv+0x2c): undefined reference to 
`__cxa_guard_release'

This is because it uses (see 
<https://github.com/arduino/Arduino/blob/master/hardware/arduino/avr/cores/arduino/PluggableUSB.cpp#L102>):

PluggableUSB_& PluggableUSB()
{
        static PluggableUSB_ obj; /* editor's note: uh oh!! */
        return obj;
}

It works just fine (it also links fine; everything OK) when I change it to:

static PluggableUSB_ obj;

PluggableUSB_& PluggableUSB()
{
        return obj;
}

Should that have worked as-is?

Also, why is avr-gcc also setting native-search-paths (even though it's a cross 
compiler)? Doesn't seem to make a difference and is also rather strange...

What does the search-paths form do? Does it set environment variables in the 
profile as well?