| Bug # | Status | Description | Patch | Notes |
| #1078 | FIXED | Problems with attributes documentation | Yes | Fixed in HEAD (future 4.3) |
| #3507 | ASSIGNED | appalling optimisation with sub/cmp on multiple targets | No | missed-optimization |
| #10768 | FIXED | ICEs on compilation of ada support library for avr | Yes | Fixed in HEAD (future 4.4). |
| #11074 | NEW | libstdc++ fails to build due to gettext issue | ? | C++. Check if valid for AVR. |
| #11180 | NEW | [avr-gcc] Optimization decrease performance of struct assignment. | No | missed-optimization |
| #11259 | NEW | [avr] gcc Double 'andi' missed optimization | Yes | missed-optimization |
| #12017 | FIXED | ICE: in spill_failure, at reload1.c:1862 with builtin_apply/builtin_return | Yes | Patch in bug report to build Objective C compiler. Fixed in 4.2.1 (at least). |
| #14118 | SUSPENDED | h8300-elf, avr-elf, m68k-elf ports cannot build libmudflap | No | |
| #16563 | NEW | The compiler doesnt the necessary push/restore of r18/r19 | No | Needs checking if fixed on 4.1.1, 4.2 branch, and HEAD. |
| #17993 | FIXED | Error in dwarf2 debug output of bitfield members | No | Fixed in >= 4.3.0. |
| #17994 | UNCONFIRMED | 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. | No | missed-optimization |
| #18251 | FIXED | unable to find a register to spill in class `POINTER_REGS' | No | 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. |
| #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. |
| #19087 | FIXED | Overflowed address in dwarf debug line information | Yes | Fixed in 4.1.3, 4.2 branch, and >= 4.3. |
| #19154 | NEW | miss-optimization of (x & pow2C) avr conditionals returning bool equivalent values | No | missed-optimization |
| #19636 | NEW | [4.0/4.1/4.2 regression] Can't compile large switch statement | No | 4.0/4.1/4.2 REGRESSION. ice-on-valid-code. Fixed in 4.3-20070525. |
| #19676 | NEW | Loop optimizer fails to reverse simple loop | No | missed-optimization |
| #19684 | FIXED | avr wrong size in asm comment (peephole) | No | Fixed in >= 4.3.0. |
| #19815 | UNCONFIRMED | Documentation change - GCC Internals MODES_TIEABLE_P | No | documentation change |
| #19959 | NEW | [4.0/4.1/4.2 Regression] Can't compile gnattools for the cross targets | No | Ada |
| #20222 | FIXED | Double load of volatile operand for abs builtin | No | Fixed in >= 4.3.0. |
| #20243 | UNCONFIRMED | static initialization .data redundantly copied to ram prior to use. | No | |
| #20296 | NEW | Speeding up small interrupts on avr | No | missed-optimization |
| #20355 | UNCONFIRMED | MEM_READONLY_P & MEM_VOLATILE_P properties are lost on BLKmode rtl operands. | No | |
| #20822 | NEW | makeinfo cannot process gnat_ugn_unw.texi | Yes | Ada. Need to check if patch has been applied and if bug is fixed. |
| #20937 | UNCONFIRMED | BLK ptr's losing original ptr's static-constant readonly attribute. | No | |
| #21018 | UNCONFIRMED | Initializing string literal data improperly marked frame-relative?, should be readonly static const. | No | |
| #21078 | UNCONFIRMED | Testsuite reports excecution failure for gcc.c-torture/execute/20010122.c for some optimization levels | No | wrong-code |
| #21080 | UNCONFIRMED | Excecution test failure for avr for pr17377 test case. | No | wrong-code |
| #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 | NEW | Missed optimizations for divmod | No | missed-optimization |
| #24894 | NEW | ICE building newlib/libc/misc/init.c | No | RTEMS/newlib. ice-on-valid-code |
| #25035 | See Note | [4.1/4.2 regression] libssp causes a failure with cross compilers with unified trees | No | Fails for the AVR target! Need to submit new bug report! |
| #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. |
| #25722 | NEW | Stackpointer is not restored correct at end of function | No | Needs testing for 4.x |
| #25742 | NEW | Internal compiler error in gen_rtx_SUBREG | No | ice-on-valid-code |
| #26118 | UNCONFIRMED | avr-gcc (GCC) 3.4.5 Bug: copying structure through pointer will destroy the pointer | No | Needs testing if fixed in later versions. Bad patch in source tree is identified. |
| #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. |
| #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. |
| #27192 | NEW | call through function pointer goes to wrong address | No | wrong-code. Reported against 4.1. |
| #27386 | NEW | AVR: wrong code generated when passing three uint64_t arguments to function | No | wrong-code. Reported against >= 3.4.6. |
| #27593 | FIXED | [4.1/4.2 Regression][avr] bad code generation with -funroll-loops | No | Fixed in >= 4.3.0. |
| #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++ |
| #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 | UNCONFIRMED | static constructors beyond 64k fail | No | C++ |
| #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. |
| #29524 | NEW | [4.2/4.3 Regression] Too much RAM used: __clz_tab[] linked | No | 4.2/4.3 REGRESSION |
| #29560 | UNCONFIRMED | Poor optimization for character shifts on Atmel AVR | No | missed-optimization |
| #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 | NEW | [4.1/4.2/4.3 Regression][avr] signbit() causes an internal compiler error | Yes | 4.1/4.2/4.3 REGRESSION. ICE |
| #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. |
| #30908 | NEW | tree cost for types which are > WORD_SIZE | No | About inline |
| #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. |
| #31528 | UNCONFIRMED | Inlining with -Os increases code size | No | Related to bug #30908. |
| #31644 | NEW | [avr] can't find a register in class 'BASE_POINTER_REGS' while reloading 'asm' | No | |
| #31786 | NEW | [4.1/4.2/4.3 Regression][avr] error: unable to find a register to spill in class 'BASE_POINTER_REGS' | No | 4.1/4.2/4.3 REGRESSION. ice-on-valid-code. |
| #32335 | FIXED | libgcc build failure, ICE in cselib_record_set, at cselib.c:1508 | No | Fixed in >= 4.3.0. |
| #32871 | NEW | Bad optimisation - Gcc is pushing too many registers | Yes | |
| #32895 | UNCONFIRMED | Clobber list isn't working | No | |
| #32901 | ASSIGNED | [4.1 regression] bitfield constants with multiple bitfields take up space in .data | No | Affects more than just the AVR target. |
| #33028 | FIXED | Missed optimizations in peephole2 pass | Yes | Fixed in >= 4.3.0. |
| #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 |
| #33200 | NEW | install fails when trying to install fix-header since fix-header wasn't built | No | Building canadian cross on Mac OSX. |
| #33782 | UNCONFIRMED | FAIL: gcc.c-torture/compile/limits-stringlit.c (test for excess errors) | No | Regression test failure. |
| #33970 | NEW | Missed optimization using unsigned char loop variable | No | missed-optimization. |
| #34210 | FIXED | ffs builtin calls undefined __ffshi2 | No | Fixed in HEAD (future 4.4). |
| #34299 | NEW | [avr] ICE on function attribute syntax for main() | No | |
| #34412 | FIXED | ICE in extract_insn, at recog.c:1990 | Yes | Fixed in >= 4.3.0. |
| #34734 | UNCONFIRMED | attribute((progmem)) not handled properly in C++ for AVRs | No | |
| #34736 | UNCONFIRMED | [avr] optimiser does not keep interrupt disabled blocks small | No | |
| #34737 | NEW | Scheduling of post-modified function arguments is not good | No | missed-optimization. Affects more than AVR target. |
| #34789 | UNCONFIRMED | [avr] sometimes the compiler keeps addresses in registers unnecessarily | No | missed-optimization. |
| #34790 | UNCONFIRMED | [avr] no sibling call optimisation | 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. |
| #34879 | UNCONFIRMED | __builtin_setjmp / __builtin_longjmp fails stack frame address with O2, O3 and Os | No | testsuite. |
| #34880 | UNCONFIRMED | gcc.c-torture/execute/float-floor.c fails for targets with no 64-bit double type | Yes | testsuite. |
| #34888 | UNCONFIRMED | Stack patterns for AVR not optimal | No | missed-optimization. |
| #34889 | UNCONFIRMED | gcc.c-torture/execute/builtins/pr23484-chk.c fails on 16 bit integer platforms | No | testsuite. |
| #34894 | UNCONFIRMED | Some compile tests require trampolines even when the target sets no_trampolines | No | testsuite. |
| #34916 | NEW | [4.3 Regression] gcc.c-torture/execute/pr27364.c fails with -O1, -O2 and -Os | Yes | testsuite. wrong-code. regression. |
| #34932 | UNCONFIRMED | [avr] ICE in reload | No | |
| #35005 | UNCONFIRMED | New testcase execute/20071211-1.c assumes 32 bit integers | Yes | testsuite. |
| #35013 | NEW | Incomplete check in RTL for "pm()" annotation | Yes | |
| #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 |
| #35509 | NEW | [4.3/4.4 Regression] builtin isinf() mismatch to compile-time substitution | No | wrong-code |
| #35519 | NEW | COMBINE repeating same matches and can SEG fault | Yes | |
| #35542 | UNCONFIRMED | fwprop only propagates one operand | No | Not AVR specific. |
| #35634 | NEW | [4.1/4.2/4.3/4.4 Regression] operand of pre-/postin-/decrement not promoted | No | 4.1/4.2/4.3/4.4 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 |