Bug 99014 – PATCH for toolchain.eclass to support AVR microcontrolers g++ compiler

• Status: RESOLVED FIXED
• Product: Gentoo Linux

[Description Ludek Stepan 2005-07-14 08:01:56 UTC]

/usr/portage/eclass/toolchain.eclass

GCC cannot cross-compile for language c++ with avr target because of bad .configure parameters gained prom toolchain.eclass. The bad parameter is --enable-threads=posix since avr-libc doesn't support threads.

Solution is to pass parameter --disable-threads to the .configure script for GCC in function gcc_do_configure (/usr/portage/eclass/toolchain.eclass). Then it compiles OK

Tested with gcc-3.4.4 and 4.0.1
Host platform is amd64

the PATCH for toolchain.eclass follows

--- backup/toolchain.eclass     2005-07-14 16:39:53.000000000 +0200
+++ /usr/portage/eclass/toolchain.eclass        2005-07-14 16:44:04.000000000 +0200
@@ -1088,6 +1088,8 @@
        # disable a bunch of features or gcc goes boom
        if is_crosscompile && [[ ${GCC_LANG} == "c" ]] ; then
                confgcc="${confgcc} --disable-shared --disable-threads --without-headers"
+       elif is_crosscompile && [[ ${CTARGET} == "avr" ]] ; then
+               confgcc="${confgcc} $(use_enable !static shared) --disable-threads"
        else
                confgcc="${confgcc} $(use_enable !static shared) --enable-threads=posix"
        fi

[Comment 1 Ludek Stepan 2005-07-14 08:25:13 UTC]

Created attachment 63400 [details, diff]
Patch for toolchain.eclass

[Comment 2 SpanKY 2005-07-14 08:57:50 UTC]

can those who actually know something about avr review this :)

[Comment 3 Gustavo Zacarias (RETIRED) 2005-07-14 11:41:56 UTC]

Created attachment 63411 [details, diff]
crossdev improvements for g++ and version locking for AVR

The toolchain.eclass patch is sane and things build fine.
However we'll need to enable stage3 in crossdev for this to be useful, patch
attached.
I've also locked down versions of gcc to 3.4.4 (includes the extended device
support patches i added some time ago) and binutils 2.16.1 (known good).
gcc 4.0.0 had some issues with avr, dunno if 4.0.1 was fixed, i'll try this at
a later time.

[Comment 4 Ludek Stepan 2005-07-14 11:54:13 UTC]

> However we'll need to enable stage3 in crossdev for this to be useful, patch
> attached.

yeah, see bug 99020

Thank You very much!
That's why I like gentoo so much :)

[Comment 5 Jeremy Huddleston (RETIRED) 2005-07-14 12:05:46 UTC]

Uhm... is the CTARGET really just 'avr'?  Should we do this for avr-*?

[Comment 6 Gustavo Zacarias (RETIRED) 2005-07-14 12:11:39 UTC]

You can safely go avr-*, however you won't see linux or some other big operating
system happening on one of these since they're 8-bit risc microcontrollers.

[Comment 7 Scott Price 2005-07-14 12:14:05 UTC]

On the GCC site they specify that the target is just 'avr'.  The longer version
may or may not work.

Scott  =)

[Comment 8 Gustavo Zacarias (RETIRED) 2005-07-14 12:15:34 UTC]

Hmmyeah, i meant avr* :)

[Comment 9 Ludek Stepan 2005-07-14 12:16:33 UTC]

(In reply to comment #8)
> Hmmyeah, i meant avr* :)
> 

it should be just avr (see line 962)

[Comment 10 SpanKY 2005-07-14 15:58:16 UTC]

yeah, 'normal' naming does not apply to avr targets ... i'll merge this patch
later tonight, thanks guys

[Comment 11 SpanKY 2005-07-14 20:09:17 UTC]

added to toolchain.eclass, thanks all

[Comment 12 Ludek Stepan 2005-07-15 07:42:36 UTC]

Thanks guy, it's nice to hear that gentoo has support for avr c++ compiler :)
Should I close the bug?

[Comment 13 SpanKY 2005-07-15 15:06:01 UTC]

the bug is closed ...