AVR Toolchain Bugs

AVR GNU Binutils Bugs

Bug #	Status	Description	Patch	Notes
#1038	ASSIGNED	resolution of weak symbol not left for the linker if value is already known	No	The status is ASSIGNED, but there is no assignee.
#2378	NEW	Incorrect opcode in __do_clear_bss if bss has more than 15 bytes	No	Not a bug, but documentation needs to be fixed. See comments.
#2626	FIXED	Problems with LPM on attiny26	Yes	Fixed in HEAD (future 2.19).
#5523	FIXED	Confusing warning: "expression dangerous with linker stubs"	No	Fixed in HEAD (future 2.19).
#6019	FIXED	[avr] avr-ld --relax requires --gc-sections	Yes	Fixed in HEAD (future 2.19).
#6449	NEW	objdump -S and DOS-style line-endings	Yes
#11164	NEW	[avr] EEPROM location wrong for XMEGA	Yes	Forward of WinAVR bug #2886068 which is now closed.

Open AVR GCC Bugs

Bug #	Status	Description	Patch	Notes
#3507	ASSIGNED	appalling optimisation with sub/cmp on multiple targets	No	missed-optimization
#11180	NEW	[avr-gcc] Optimization decrease performance of struct assignment.	No	missed-optimization
#17994	NEW	avr-gcc does not output a dwarf2 .debug_frame section	No
#18065	NEW	usual arithmetic conversion not applying correctly	No	missed-optimization
#18145	NEW	Do not emit __do_copy_data or __do_clear_bss if .data or .bss is empty.	Yes	missed-optimization
#18989	See Note	A few potentially ominous, and several likely harmless warnings during 4.0 build	Yes	One warning Fixed in 4.1.3, 4.2 branch, and >= 4.3.0. Another warning still needs to be fixed.
#19676	NEW	Loop optimizer fails to reverse simple loop	No	missed-optimization
#19815	UNCONFIRMED	Documentation change - GCC Internals MODES_TIEABLE_P	No	documentation change
#20296	NEW	Speeding up small interrupts on avr	No	missed-optimization
#21018	NEW	Initializing string literal data improperly marked frame-relative?, should be readonly static const.	No
#25722	UNCONFIRMED	Stackpointer is not restored correct at end of function	No	Needs testing for 4.x
#26882	NEW	[AVR][C++] ICE when using template function with memory attributes	No	C++. ice-on-valid-code.
#26883	NEW	ICE when assigning memory attribute to class with simple constructor	No	C++. ice-on-valid-code.
#27663	NEW	missed-optimization transforming a byte array to unsigned long	No	missed-optimization
#28718	UNCONFIRMED	Call to -lgcc added prior to user libraries	No	C++
#29524	NEW	[4.2/4.3 Regression] Too much RAM used: __clz_tab[] linked	No	4.2/4.3 REGRESSION
#29560	NEW	[avr] Poor optimization for byte shifts	No	missed-optimization
#30908	NEW	tree cost for types which are > WORD_SIZE	No	About inline
#31528	NEW	Inlining with -Os increases code size	No	Related to bug #30908.
#33049	NEW	[avr] bit extraction non optimal, inversing logic solves problem	No	missed-optimization
#33050	NEW	[avr] unnessary register save	No	missed-optimization
#33315	NEW	If condition not getting eliminated	No	missed-optimization
#33970	NEW	Missed optimization using unsigned char loop variable	No	missed-optimization.
#34040	NEW	Support for DOUBLE_TYPE_SIZE != 64 targets	No	enhancement. Fortran
#34734	NEW	attribute((progmem)) not handled properly in C++ for AVRs	No
#34737	NEW	Scheduling of post-modified function arguments is not good	No	missed-optimization. Affects more than AVR target.
#34789	NEW	[avr] sometimes the compiler keeps addresses in registers unnecessarily	No	missed-optimization.
#34791	UNCONFIRMED	[avr] optimisation of 8-bit logic sometimes fails	No	missed-optimization.
#34792	UNCONFIRMED	[avr] c++ worse than c compiler at 8-bit optimisations	No	missed-optimization.
#34888	UNCONFIRMED	Stack patterns for AVR not optimal	No	missed-optimization.
#35073	NEW	illegal opcode movw for mcu avr3	No	AVR RTEMS
#35507	NEW	[avr] 4.3.0: size of small funcion increases from 2 to 29 words	No	missed-optimization
#35634	NEW	[4.1/4.2/4.3/4.4 Regression] operand of pre-/postin-/decrement not promoted	No	4.3/4.4/4.5 REGRESSION. wrong-code. C front-end.
#35860	NEW	[4.3 Regression] [avr] code bloat caused by -fsplit-wide-types	No	4.3 REGRESSION. missed-optimization
#36467	NEW	[avr] Missed optimization with pointer arithmetic and mul*	No	missed-optimization
#36561	NEW	store using long array index not hoisted out of loop	No	Enhancement. alias, missed-optimization
#36571	UNCONFIRMED	Default untyped return for AVR is byte register.	No	Test is XFAILed in >= 4.4.0.
#36598	NEW	Failed optimisation of return of struct argment in memcpy-1.c	No	testsuite. Test is XFAILed in >= 4.4.0.
#36884	UNCONFIRMED	ifcvt poor optimization	No
#37165	UNCONFIRMED	[4.4 Regression] FAIL: gcc.dg/matrix/matrix-1.c scan-ipa-dump-times matrix-reorg "Flattened 3 dimensions" 1	No
#37942	UNCONFIRMED	[4.4/4.5 Regression] FAIL: gcc.c-torture/compile/930618-1.c	No	4.4/4.5 REGRESSION
#38159	UNCONFIRMED	[avr] ICE: gcc.c-torture/execute/pr38051.c compilation, -O3 -fomit-frame-pointer -funroll-all-loops -finline-functions	No	ice-on-valid-code
#38342	NEW	[4.3/4.4 Regression] __attribute__((__progmem__)) not propagated from typedef to data	No	4.3 REGRESSION. C++
#38549	NEW	[avr] eicall not properly set for > 128K program space	No
#38629	NEW	target-specific parameters for inline heuristics not defined for AVR	No	enhancement
#39184	UNCONFIRMED	ICE in tree_low_cst, at tree.c:4976	No	RTEMS
#39212	NEW	ice for AVR target: unable to find a register to spill in class 'POINTER_REGS'	No
#39250	ASSIGNED	unsigned char times 64U produces long slow loop	No	missed-optimization
#39386	NEW	[avr] different computation results for O1 and O0 executables	No
#39510	NEW	[avr] missed optimisation with IO read and register variables	No	missed-optimization
#39621	NEW	Delaying operation to end of function causes high stack usage	No	Affects multiple targets, including avr.
#39633	NEW	[avr] loop bug	No
#39819	NEW	[avr] Missed optimisation when setting 4-byte values	No	missed-optimization
#41738	NEW	[4.3/4.4/4.5 Regression] optabs expands rotate using wrong mode	No	wrong-code. Fixed in 4.5.0. Waiting for 4.4 backport.
#41885	UNCONFIRMED	AVR Rotate patterns do not correctly consider overlap.	No
#41894	NEW	wrong code with -fno-split-wide-types	No	wrong-code. Fixed in 4.5.0
#42146	UNCONFIRMED	ICE in tree_low_cst	No
#42149	UNCONFIRMED	ICE:verify_gimple failed for avr target	No	ice-on-valid-code
#42204	UNCONFIRMED	update_eliminables should be called in reload after something changes	No
#42210	NEW	avr: optimizing assignment to a bit field	No	missed-optimization
#42240	UNCONFIRMED	wrong epilogue on naked function	No
#42976	UNCONFIRMED	Illegal translation for IF operator	No
#43088	UNCONFIRMED	[avr] Suspect optimizer missed code in gcc 4.4.3..	No
#43095	UNCONFIRMED	[avr] GCC produces poor code for 4- and 8-byte values	No
#43104	UNCONFIRMED	Incorrect code generation for target mcu ATMega164P	No
#43745	UNCONFIRMED	[avr] g++ puts VTABLES in SRAM	No	Enhancement
#43746	UNCONFIRMED	-fmerge-constants and -fmerge-all-constants don't work at AVR target	No	Enhancement

Closed AVR GCC Bugs

Bug #	Status	Description	Patch	Notes
#1078	FIXED	Problems with attributes documentation	Yes	Fixed in HEAD (future 4.3)
#10768	FIXED	ICEs on compilation of ada support library for avr	Yes	Fixed in HEAD (future 4.4).
#11074	FIXED	libstdc++ fails to build due to gettext issue	?	Fixed in >= 4.3.2.
#11259	FIXED	[avr] gcc Double 'andi' missed optimization	Yes	Fixed in >= 4.4.0.
#12017	FIXED	ICE: in spill_failure, at reload1.c:1862 with builtin_apply/builtin_return	Yes	Fixed in >= 4.2.1.
#16563	FIXED	The compiler doesnt the necessary push/restore of r18/r19	No	Fixed in >= 4.0.0.
#17993	FIXED	Error in dwarf2 debug output of bitfield members	No	Fixed in >= 4.3.0.
#18251	FIXED	unable to find a register to spill in class `POINTER_REGS'	Yes	Fixed in >= 4.3.0.
#18553	FIXED	Annoying warning with -ffunction-sections -g	Yes	Fixed in 4.1.2, 4.2 branch, and 4.3 branch.
#19087	FIXED	Overflowed address in dwarf debug line information	Yes	Fixed in 4.1.3, 4.2 branch, and >= 4.3.
#19154	FIXED	miss-optimization of (x & pow2C) avr conditionals returning bool equivalent values	No	Fixed in >= 4.5.0.
#19636	FIXED	[4.0/4.1/4.2 regression] Can't compile large switch statement	No	Fixed in >= 4.4.0.
#19684	FIXED	avr wrong size in asm comment (peephole)	No	Fixed in >= 4.3.0.
#19959	FIXED	[4.0/4.1/4.2 Regression] Can't compile gnattools for the cross targets	No	Fixed in >= 4.4.0.
#20222	FIXED	Double load of volatile operand for abs builtin	No	Fixed in >= 4.3.0.
#20822	FIXED	makeinfo cannot process gnat_ugn_unw.texi	Yes	Fixed in >= 4.4.0.
#21080	FIXED	Excecution test failure for avr for pr17377 test case.	Yes	Fixed in >= 4.5.0.
#21107	FIXED	[4.0/4.1/4.2 regression] internal compiler error: in expand_one_stack_var_at, at cfgexpand.c:476	No	Fixed in 4.1.0
#23479	FIXED	Implement binary constants with a "0b" prefix	Yes	Fixed in >= 4.3.0
#23726	FIXED	Missed optimizations for divmod	Yes	Fixed in >= 4.5.0
#24894	FIXED	ICE building newlib/libc/misc/init.c	No	Fixed in >= 4.4.0.
#25035	FIXED	[4.1/4.2 regression] libssp causes a failure with cross compilers with unified trees	No	Fixed in >= 4.1.3 / 4.4.0.
#25448	FIXED	[4.0/4.1/4.2 Regression] Unfounded warnings from the AVR backend	Yes	Fixed in 4.1.3, 4.2 branch, and >= 4.3.0.
#26504	FIXED	[4.1/4.2 Regression] compute_frame_pointer_to_cfa_displacement error for avr target with --with-dwarf2	Yes	Fixed in 4.1.2 and 4.2 branch.
#27192	FIXED	call through function pointer goes to wrong address	Yes	Fixed in >= 4.5.0.
#27386	FIXED	AVR: wrong code generated when passing three uint64_t arguments to function	No	Fixed in >= 4.4.0, >= 4.3.2.
#27593	FIXED	[4.1/4.2 Regression][avr] bad code generation with -funroll-loops	No	Fixed in >= 4.3.0.
#28902	FIXED	Fix for "alignment of XXX is greater than maximum object alignment" on AVR	Yes	Fixed in 4.2.1, and >= 4.3.0.
#29141	FIXED	static constructors beyond 64k fail	No	Fixed in 4.4.0.
#29449	FIXED	OBJECT_FORMAT_ELF not defined for the AVR target	No	Fixed in 4.1.2, 4.2 branch, and >= 4.3.0. Depends on GCC bug #18553.
#29932	FIXED	avr-gcc wrongly optimizes bit sets/resets for IO register 0x20	Yes	Works for 4.1.x. Fixed in 4.2 branch >= 4.3.0.
#30243	FIXED	[4.1/4.2/4.3 Regression][avr] signbit() causes an internal compiler error	Yes	Fixed in >= 4.4.0, >= 4.3.2.
#30289	FIXED	avr-gcc: builtin memset(): wrong code	No	Fixed in 4.1.3, 4.2 branch, and >= 4.3.0.
#30483	FIXED	Internal compiler error with inline volatile assembly on AVR	No	Fixed in 4.1.3, 4.2 branch, and >= 4.3.0.
#30841	FIXED	[4.3 regression] Missed optimizations for sbi/cbi instructions	No	Fixed in >= 4.3.0.
#31137	FIXED	missing "break" in switch for MULT in avr_rtx_costs	Yes	Fixed in 4.1.3, 4.2 branch, and >= 4.3.0.
#31331	FIXED	ICE on invalid function attribute syntax for main()	Yes	Fixed in 4.1.3, 4.2.1 and >= 4.3.0.
#31644	FIXED	[avr] can't find a register in class 'BASE_POINTER_REGS' while reloading 'asm'	Yes	Fixed in >= 4.4.0.
#31786	FIXED	[4.1/4.2/4.3 Regression][avr] error: unable to find a register to spill in class 'BASE_POINTER_REGS'	Yes	Fixed in >= 4.4.0.
#32335	FIXED	libgcc build failure, ICE in cselib_record_set, at cselib.c:1508	No	Fixed in >= 4.3.0.
#32901	FIXED	[4.1 regression] bitfield constants with multiple bitfields take up space in .data	No	Fixed in >= 4.1.3 / 4.3.1 (?).
#33028	FIXED	Missed optimizations in peephole2 pass	Yes	Fixed in >= 4.3.0.
#33200	FIXED	install fails when trying to install fix-header since fix-header wasn't built	No	Fixed in >= 4.5.0.
#33782	FIXED	FAIL: gcc.c-torture/compile/limits-stringlit.c (test for excess errors)	No	Fixed in >= 4.4.0.
#34210	FIXED	ffs builtin calls undefined __ffshi2	Yes	Fixed in HEAD (future 4.4).
#34299	FIXED	[avr] ICE on function attribute syntax for main()	No	Fixed in >= 4.4.0.
#34412	FIXED	ICE in extract_insn, at recog.c:1990	Yes	Fixed in >= 4.3.0.
#34879	FIXED	__builtin_setjmp / __builtin_longjmp fails stack frame address with O2, O3 and Os	Yes	Fixed in >= 4.4.0.
#34880	FIXED	gcc.c-torture/execute/float-floor.c fails for targets with no 64-bit double type	Yes	Fixed in >= 4.4.0.
#34889	FIXED	gcc.c-torture/execute/builtins/pr23484-chk.c fails on 16 bit integer platforms	No	Fixed in >= 4.4.0.
#34894	FIXED	Some compile tests require trampolines even when the target sets no_trampolines	Yes	Fixed in >= 4.4.0.
#34916	FIXED	[4.3 Regression] gcc.c-torture/execute/pr27364.c fails with -O1, -O2 and -Os	Yes	Fixed in >= 4.3.1 / 4.4.0.
#34932	FIXED	[avr] ICE in reload	No	Fixed in >= 4.4.0, >= 4.3.2.
#35005	FIXED	New testcase execute/20071211-1.c assumes 32 bit integers	Yes	Fixed in >= 4.4.0.
#35013	FIXED	Incomplete check in RTL for "pm()" annotation	Yes	Fixed in >= 4.5.0.
#35509	FIXED	[4.3/4.4 Regression] builtin isinf() mismatch to compile-time substitution	No	Fixed in >= 4.4.0.
#35519	FIXED	COMBINE repeating same matches and can SEG fault	Yes	Fixed in >= 4.3.1 / 4.4.0.
#35542	FIXED	fwprop only propagates one operand	Yes	Fixed in >= 4.3.2 / 4.4.0.
#35872	FIXED	[4.3 regression] incorrect code for 32bit multiplication by constant	No	Fixed in >= 4.3.1 / 4.4.0.
#36212	FIXED	Vector alignment overides Target alignment	Yes	Fixed in >= 4.4.0.
#36284	FIXED	gcc.dg-struct-layout fails AVR target - multiple reasons	No	Fixed in >= 4.4.0.
#36285	FIXED	gcc.dg/compat/struct-by-value-xxx improper test for AVR target	No	Fixed in >= 4.4.0.
#36336	FIXED	ICE push_reload - psuedo reg_equiv_constant	No	Fixed in >= 4.3.2 / 4.4.0.
#36424	FIXED	avr-gcc use don't saved registers in ISR with -O3 ('-frename-registers' ) optimization	Yes	Fixed in >= 4.4.0.
#36447	FIXED	[4.4 Regression] simplify_subreg ICE with right shift more than length type AVR	Yes	Fixed in >= 4.4.0.
#36470	FIXED	sizeof UTF-32 is 2 on AVR	No	Fixed in >= 4.5.0.
#36903	FIXED	Generic vectorizarion test failures	No	Fixed in >= 4.5.0.
#37020	FIXED	[4.4 Regression] [AVR] FAIL: gcc.dg/debug/dwarf2/dwarf-die3.c scan-assembler-not DW_AT_inline	No	Fixed in >= 4.4.0.
#37081	FIXED	[avr] FAIL: gcc.dg/pr36998.c	No	Fixed in >= 4.5.0.
#37466	FIXED	[AVR] avr-gcc generating incorrect assembly for expression with the long constant operands	Yes	Fixed in >= 4.3.3.
#38036	FIXED	[4.4/4.5 Regression][AVR] FAIL: gcc.c-torture/execute/pr37573.c execution	No	Fixed in >= 4.4.3.
#38202	FIXED	[avr] FAIL: gcc.dg/torture/pr37868.c	No	Fixed in >= 4.5.0.
#38558	FIXED	[avr] ICE on function attribute syntax for __vectorN()	No	Fixed in >= 4.4.0. Duplicate of bug 34299
#39223	FIXED	volatile bug on AVR	No	Fixed in >= 4.4.2.
#41440	FIXED	SEG FAULT in CSE.C caused by bad RTL expansion	Yes	Fixed in >= 4.5.0.
#42457	FIXED	[4.5 Regression] AVR fails to build with other than C family languages	No	Fixed in >= 4.5.0.
#42483	FIXED	AVR fails all whopr/lto tests	No	Fixed in >= 4.5.0.

Host Specific Bugs Affecting Toolchain Distros

Bug #	Status	Description	Patch	Notes
#17621	FIXED	Add option to have GCC not search $(prefix)	Yes	Fixed in HEAD (future 4.3).
#22133	FIXED	In MinGW trailing forward slash not allowed in include path	Yes	Fixed in HEAD (future 4.3).
#30972	UNCONFIRMED	Call to _access has invalid parameter when linked with msvcrt	Yes	Building the toolchain on Windows Vista

avr-libc Bugs

List here.

AVRDUDE Bugs

List here.

AVaRICE Bugs

List here.

AVR GDB Bugs

Bug #	Status	Description	Patch	Notes
#1948	OPEN	remote_xfer_partial(): packet size probe fails when LENGTH and OFFSET are zero [target: avr]	Yes	GDB 6.3. This looks like it's fixed in 6.6, but needs retesting.
#2124	See Note	gdb crashes when remote simulavrxx target branches to interrupt handler	No	Confirmed: Cannot reproduce with later tools. See comments in bug.

Last updated: $Date: 2010/04/14 20:00:48 $