From mboxrd@z Thu Jan  1 00:00:00 1970
From: Danny Milosavljevic <dannym@scratchpost.org>
Subject: Re: [PATCH 2/5] gnu: Add avr-gcc.
Date: Mon, 15 Aug 2016 13:59:36 +0200
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To: "Thompson, David" <dthompson2@worcester.edu>
Cc: guix-devel <guix-devel@gnu.org>

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?