2026-10-09 Philipp Klaus Krause <philipp@colecovision.eu>

	* src/z80/peeph.def:
	  Remove two peephole optimizer rules that do not improve the code in any regression tests, fix some others.

2026-10-09 Philipp Klaus Krause <philipp@colecovision.eu>

	* src/SDCCsymt.c,
	  src/SDCCerr.h,
	  src/SDCCerr.c,
	  support/valdiag/tests/bug-4117.c,
	  support/regression/tests/bug-4117.c:
	  Diagnose derived enum underlying types, based on patch by Christopher Bazley.

2026-10-09 Philipp Klaus Krause <philipp@colecovision.eu>

	* src/SDCCval.c,
	  support/regression/tests/bug-4119.c,
	  support/valdiag/tests/bug-4119.c:
	  Avoid host overflow when folding signed minimum divided by minus
	  one or its remainder. Store recovered _BitInt quotients with the
	  correct sign extension. Patch by Christopher Bazley.

2026-10-09 Philipp Klaus Krause <philipp@colecovision.eu>

	* src/pic16/glue.c:
	  Fix an issue in inline function handling, bug #4122, patch by zeynelsagcan.
	* device/lib/pic16/libsdcc/fixed16x16/fps16x16_eq.c,
	  device/lib/pic16/libsdcc/fixed16x16/fps16x16_gt.c,
	  device/lib/pic16/libsdcc/fixed16x16/fps16x16_gteq.c,
	  device/lib/pic16/libsdcc/fixed16x16/fps16x16_lt.c,
	  device/lib/pic16/libsdcc/fixed16x16/fps16x16_lteq.c,
	  device/lib/pic16/libsdcc/fixed16x16/fps16x16_neq.c,
	  src/SDCCsymt.c:
	  Make fixed-point comparison support functions return unsigned char.
	* support/regression/tests/bug-4002.c,
	  support/regression/tests/bug-4003.c,
	  support/regression/tests/bug-4005.c:
	  Disable some tests for host, where we can't assume _Optional support.

2026-10-08 Philipp Klaus Krause <philipp@colecovision.eu>

	* device/include/stdbit.h,
	  device/lib/__stdc_bit_width.c,
	  device/lib/__stdc_count_ones.c,
	  device/lib/__stdc_first_leading_one.c,
	  device/lib/__stdc_first_trailing_one.c,
	  device/lib/__stdc_leading_zeros.c,
	  device/lib/__stdc_trailing_ones.c:
	  Make stdbit.h usable without _BitInt, patch by  zeynelsagcan.
	* src/z80/peeph-sm83.def,
	  src/z80/peeph.def:
	  Peephole optimizer rule fixes.

2026-10-08 Philipp Klaus Krause <philipp@colecovision.eu>

	* src/z80/peeph-sm83.def,
	  src/z80/peeph.def:
	  Remove some untested (i.e. they apply for no regression test) peephole optimizer rules suspected to be broken.

2026-10-08 Philipp Klaus Krause <philipp@colecovision.eu>

	* src/z80/peeph.def,
	  support/regression/tests/bug-4115.c:
	  Fix bug #4115 (the reproducible part).

2026-10-08 Philipp Klaus Krause <philipp@colecovision.eu>

	* src/SDCCval.c:
	  Adjust function parameters to pointers before qualifier checking and
	  symbol binding, fixing indirect calls (bug #3028, related to #3358), patch by Christopher Bazley.
	* support/regression/tests/bug-3028.c,
	  support/valdiag/tests/bug-3028.c:
	  Test named and unnamed parameters, redeclarations, calls and _Optional, patch by Christopher Bazley.

2026-10-08 Philipp Klaus Krause <philipp@colecovision.eu>

	* src/SDCCast.c,
	  src/SDCCerr.c,
	  src/SDCCerr.h,
	  support/regression/tests/typeof.c,
	  support/valdiag/tests/bug-4000.c:
	  Fix bug #4000, patch by Christopher Bazley.

2026-10-07 Philipp Klaus Krause <philipp@colecovision.eu>

	* src/SDCCast.c, src/SDCCicode.c, src/SDCCicode.h, src/SDCCopt.c,
	  src/SDCCsymt.c, src/SDCCsymt.h, support/valdiag/tests/bug-3953.c,
	  support/valdiag/tests/bug-4006.c:
	  Check referenced qualifiers after expression decay on assignments and
	  returns (bug #4006). Avoid repeating incompatible-type diagnostics.
	  Remove the late iCode qualifier checker and unused restrict-loss flag.
	  Patch by Christopher Bazley.

2026-10-07 Philipp Klaus Krause <philipp@colecovision.eu>

	* src/SDCCast.c, src/SDCCicode.c, src/SDCCsymt.c, src/SDCCsymt.h,
	  support/regression/tests/bug-4005.c,
	  support/valdiag/tests/_Optional-draft-2026-04-17.c:
	  Centralise expression array decay and remove _Optional from its