[Bug c++/100629] Regression from 10 symbol mismatch between class definition and use with/without optimization

[mckelvey at maskull dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100629

--- Comment #24 from James McKelvey <mckelvey at maskull dot com> ---
Running Cygwin 3.2.0(0.340/5/3) under Windows 10.

Using built-in specs.
COLLECT_GCC=/usr/local/bin/g++
COLLECT_LTO_WRAPPER=/usr/local/libexec/gcc/x86_64-pc-cygwin/11.1.1/lto-wrapper.exe
Target: x86_64-pc-cygwin
Configured with: ./configure --enable-languages=c,c++
Thread model: single
Supported LTO compression algorithms: zlib
gcc version 11.1.1 20210515 (GCC)

Compiler options compiling project:

/usr/local/bin/g++ -std=c++0x -c  -O3 -DNDEBUG     -DUSE_INTL=1 -DUSE_MUTEX=1 
-D_FORTIFY_SOURCE=1 -pedantic-errors -Werror -fno-common -Wall -Wold-style-cast
-Wsign-promo -Wpointer-arith -Wundef -Wwrite-strings -Winvalid-pch
-Woverloaded-virtual -Wcast-qual -Wextra -Wredundant-decls -Wshadow
-Wcast-align=strict -Wcomment -fstrict-aliasing -Winit-self
-Wmissing-include-dirs -Wswitch-default -Wswitch-enum -Wlogical-op -Wconversion
-Wsign-conversion -Wmissing-declarations -Wdeprecated -ftree-switch-conversion
-Wuninitialized -Wparentheses -Wimplicit-fallthrough=5 -Wformat-nonliteral
-Wformat-truncation=2 -Wformat-signedness -Wdouble-promotion -Wformat=2
-Wformat-overflow=2 -Wformat-security -Wnull-dereference -Wmain
-Wmultistatement-macros -Wsequence-point -Wswitch-default -Wswitch-enum
-Wunused-value -Wstrict-overflow=2 -Warith-conversion -Wfloat-conversion
-Wduplicated-cond -Wunsafe-loop-optimizations -Wreturn-type -Wunused-parameter
-Wmaybe-uninitialized -Wstrict-aliasing -Wsuggest-attribute=noreturn
-Wsuggest-attribute=format -Wsuggest-attribute=malloc
-Wmissing-format-attribute -Wmissing-noreturn -Walloc-zero -Walloca
-Wtrampolines -Wcast-function-type -Wlogical-op -Wpacked -Wredundant-decls
-Wunused -Wmismatched-dealloc -Wmismatched-new-delete -Wfree-nonheap-object
-Wexceptions -MMD      -fimplicit-templates

For linking:

/usr/local/bin/g++ -std=c++0x  -O3 -DNDEBUG     -DUSE_INTL=1 -DUSE_MUTEX=1 
-D_FORTIFY_SOURCE=1 -pedantic-errors -Werror -fno-common -Wall -Wold-style-cast
-Wsign-promo -Wpointer-arith -Wundef -Wwrite-strings -Winvalid-pch
-Woverloaded-virtual -Wcast-qual -Wextra -Wredundant-decls -Wshadow
-Wcast-align=strict -Wcomment -fstrict-aliasing -Winit-self
-Wmissing-include-dirs -Wswitch-default -Wswitch-enum -Wlogical-op -Wconversion
-Wsign-conversion -Wmissing-declarations -Wdeprecated -ftree-switch-conversion
-Wuninitialized -Wparentheses -Wimplicit-fallthrough=5 -Wformat-nonliteral
-Wformat-truncation=2 -Wformat-signedness -Wdouble-promotion -Wformat=2
-Wformat-overflow=2 -Wformat-security -Wnull-dereference -Wmain
-Wmultistatement-macros -Wsequence-point -Wswitch-default -Wswitch-enum
-Wunused-value -Wstrict-overflow=2 -Warith-conversion -Wfloat-conversion
-Wduplicated-cond -Wunsafe-loop-optimizations -Wreturn-type -Wunused-parameter
-Wmaybe-uninitialized -Wstrict-aliasing -Wsuggest-attribute=noreturn
-Wsuggest-attribute=format -Wsuggest-attribute=malloc
-Wmissing-format-attribute -Wmissing-noreturn -Walloc-zero -Walloca
-Wtrampolines -Wcast-function-type -Wlogical-op -Wpacked -Wredundant-decls
-Wunused -Wmismatched-dealloc -Wmismatched-new-delete -Wfree-nonheap-object
-Wexceptions -Winline -MMD      -fimplicit-templates  -Wl,-warn-common -L.. -o
header_edit.exe header_edit.o -lPatternDriver -lintl -lpthread

Yes I know that most warnings have no effect at link time.