BUGS

* The avr51-flash1.x linker script missed the .progmemx.* sections.
The script is used in some address-space tests in the avr-gcc
test suite.  With AVR-LibC issue #962, all constant lookup data
is placed in .progmemx, so that some tests were failing.
The test cases get -lprintf_flt from dejagnuboards avrtest.exp,
and the missing .progmemx.* input sections were orphans that
overlapped with .data.

  Affected versions: ? -- r360 (2024-06-01)

* During performance measurement, SP might be read during
a glitch.  SP is no more read during a glitch, i.e. no more
read while SP is being updated by means of OUT.
Fix a fatal error that might occor with with LOG_PERF.

  Affected versions: r150 (2014-10-06) -- r221 (2019-09-09)

* Correctly display sub-normal floats in LOG_[[P]FMT_]FLOAT
and PERF_TAG_[[P]FMT_]FLOAT.

  Affected versions: r150 (2014-10-06) -- r219 (2019-08-20)

* Allow a global variable of name 'start' without being used
  as program entry point.

  Affected versions: r152 (2014-10-07) -- r217 (2019-08-13)

* Wrong decoding of 1st instruction if entry-point is not 0x0.

  Affected versions: r158 (2014-10-13) -- r180 (2016-06-24)

* Wrong SBRC / SBRS / SBIC / SBIS / CPSE skip offset.

  Affected versions: r157 (2014-10-11) -- r164 (2014-10-20)