As a workaround,
CPPFLAGS += -I${HOME}/.guix-profile/avr/include
LDFLAGS += -L${HOME}/.guix-profile/avr/lib/avr5 -L${HOME}/.guix-profile/avr/lib
-B${HOME}/.guix-profile/avr/lib
works with avr-gcc 5.3.0. Unfortunately I don't know enough about avr-gcc to be
able to permanently fix it.
I fixed part of it (I made it so that atmega32u4 exists in the first place) in
master - but no idea what to do with the search path.
I'm pretty sure that if it uses CROSS_CPATH it's incorrect because cross-base
has been changed from CROSS_CPATH to CROSS_C_INCLUDE_PATH,
CROSS_CPLUS_INCLUDE_PATH etc in order to suppress warnings. If
CROSS_C_INCLUDE_PATH overrides CROSS_CPATH (does it?) then setting CROSS_CPATH
like avr.scm does does no good.
I propose to change it to the following:
diff --git a/gnu/packages/avr.scm b/gnu/packages/avr.scm
index 9873477..1e5fd73 100644
--- a/gnu/packages/avr.scm
+++ b/gnu/packages/avr.scm
@@ -59,9 +59,18 @@
#t))))
((#:configure-flags flags)
`(delete "--disable-multilib" ,flags))))
- (native-search-paths
+ (native-search-paths
(list (search-path-specification
- (variable "CROSS_CPATH")
+ (variable "CROSS_C_INCLUDE_PATH")
+ (files '("avr/include")))
+ (search-path-specification
+ (variable "CROSS_CPLUS_INCLUDE_PATH")
+ (files '("avr/include")))
+ (search-path-specification
+ (variable "CROSS_OBJC_INCLUDE_PATH")
+ (files '("avr/include")))
+ (search-path-specification
+ (variable "CROSS_OBJCPLUS_INCLUDE_PATH")
(files '("avr/include")))
(search-path-specification
(variable "CROSS_LIBRARY_PATH")
