bug#63365: 30.0.50; GCC 13.1 breaks building Emacs with native-compilation

[Cyril Arnould]

Ok, I think I got it; it's src/thread.c. The following build succeeds:

 

git clean -xdf

git checkout emacs-29.0.92

./autogen.sh

./configure --with-native-compilation

cd src

make temacs.exe

make thread.o -W thread.c CFLAGS='-g3 -O2 -gdwarf-2 -fno-optimize-sibling-calls'

cd ..

make

 

I first compile temacs.exe with CFLAGS at default and then rebuild

thread.c with -fno-optimize-sibling-calls. This way thread.c should be

the only file built with the flag. Conversely, compiling with

-fno-optimiize-sibling-calls everywhere *but* thread.c fails:

 

git clean -xdf

git checkout emacs-29.0.92

./autogen.sh

./configure --with-native-compilation

cd src

make temacs.exe CFLAGS='-g3 -O2 -gdwarf-2 -fno-optimize-sibling-calls'

make thread.o -W thread.c

cd ..

make CFLAGS='-g3 -O2 -gdwarf-2 -fno-optimize-sibling-calls'

 

> Using make -j1 (or even better make bootstrap -j1) should make it

> reproducible.

>   make LD_SWITCH_SYSTEM='-Wl,--disable-dynamicbase'

>

> Maybe this will make the bug less unpredictable, who knows?

 

Tried them, the failing lisp files still seem random.