gcc-12.3 cannot build gcc-ada on Cygwin

[Achim Gratz]

I've recently recovered Ada into gcc-11.3 on Cygwin and am now trying to
update the whole compiler suite to 12.3.  The build runs into a problem
in stage 2:

--8<---------------cut here---------------start------------->8---
make[3]: Entering directory '/mnt/share/cygpkgs/gcc/gcc.x86_64/build/gcc'
/mnt/share/cygpkgs/gcc/gcc.x86_64/build/./prev-gcc/xg++ -B/mnt/share/cygpkgs/gcc/gcc.x86_64/build/./prev-gcc/ -B/usr/x86_64-pc-cygwin/bin/ -nostdinc++ -B/mnt/share/cygpkgs/gcc/gcc.x86_64/build/prev-x86_64-pc-cygwin/libstdc++-v3/src/.libs -B/mnt/share/cygpkgs/gcc/gcc.x86_64/build/prev-x86_64-pc-cygwin/libstdc++-v3/libsupc++/.libs  -I/mnt/share/cygpkgs/gcc/gcc.x86_64/build/prev-x86_64-pc-cygwin/libstdc++-v3/include/x86_64-pc-cygwin  -I/mnt/share/cygpkgs/gcc/gcc.x86_64/build/prev-x86_64-pc-cygwin/libstdc++-v3/include  -I/mnt/share/cygpkgs/gcc/gcc.x86_64/src/gcc-12.3.0/libstdc++-v3/libsupc++ -L/mnt/share/cygpkgs/gcc/gcc.x86_64/build/prev-x86_64-pc-cygwin/libstdc++-v3/src/.libs -L/mnt/share/cygpkgs/gcc/gcc.x86_64/build/prev-x86_64-pc-cygwin/libstdc++-v3/libsupc++/.libs  -fno-PIE -c  -DIN_GCC_FRONTEND -fdebug-prefix-map=/mnt/share/cygpkgs/gcc/gcc.x86_64/build=/usr/src/debug/gcc-12.3.0-0.1 -fdebug-prefix-map=/mnt/share/cygpkgs/gcc/gcc.x86_64/src/gcc-12.3.0=/usr/src/debug/gcc-12.3.0-0.1 -fno-checking -gtoggle -DIN_GCC     -fno-exceptions -fno-rtti -fasynchronous-unwind-tables -W -Wall -Wno-narrowing -Wwrite-strings -Wcast-qual  -Wmissing-format-attribute -Woverloaded-virtual -Wno-long-long -Wno-variadic-macros -Wno-overlength-strings   -DHAVE_CONFIG_H -I. -Iada -I/mnt/share/cygpkgs/gcc/gcc.x86_64/src/gcc-12.3.0/gcc -I/mnt/share/cygpkgs/gcc/gcc.x86_64/src/gcc-12.3.0/gcc/ada -I/mnt/share/cygpkgs/gcc/gcc.x86_64/src/gcc-12.3.0/gcc/../include -I/mnt/share/cygpkgs/gcc/gcc.x86_64/src/gcc-12.3.0/gcc/../libcpp/include -I/mnt/share/cygpkgs/gcc/gcc.x86_64/src/gcc-12.3.0/gcc/../libcody  -I/mnt/share/cygpkgs/gcc/gcc.x86_64/src/gcc-12.3.0/gcc/../libdecnumber -I/mnt/share/cygpkgs/gcc/gcc.x86_64/src/gcc-12.3.0/gcc/../libdecnumber/bid -I../libdecnumber -I/mnt/share/cygpkgs/gcc/gcc.x86_64/src/gcc-12.3.0/gcc/../libbacktrace   -o ada/argv.o -MT ada/argv.o -MMD -MP -MF ada/.deps/argv.TPo /mnt/share/cygpkgs/gcc/gcc.x86_64/src/gcc-12.3.0/gcc/ada/argv.c
/mnt/share/cygpkgs/gcc/gcc.x86_64/src/gcc-12.3.0/gcc/system.h:783:30: error: expected identifier before string constant
  783 | #define abort() fancy_abort (__FILE__, __LINE__, __FUNCTION__)
      |                              ^~~~~~~~
/mnt/share/cygpkgs/gcc/gcc.x86_64/src/gcc-12.3.0/gcc/system.h:783:30: error: expected ‘,’ or ‘...’ before string constant
/mnt/share/cygpkgs/gcc/gcc.x86_64/src/gcc-12.3.0/gcc/system.h:783:30: error: expected identifier before string constant
  783 | #define abort() fancy_abort (__FILE__, __LINE__, __FUNCTION__)
      |                              ^~~~~~~~
/mnt/share/cygpkgs/gcc/gcc.x86_64/src/gcc-12.3.0/gcc/system.h:783:30: error: expected ‘,’ or ‘...’ before string constant
make[3]: *** [Makefile:1143: ada/argv.o] Error 1
--8<---------------cut here---------------end--------------->8---

The error probably is in part a result of using g++ for the compilation,
but other than that I don't really have an idea what goes on here or how
to fix it.


Regards,
Achim.
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