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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug modula2/111330] [13 Regression] Bootstrap failure building
 SeqFile.lo
Date: Fri, 08 Sep 2023 20:08:35 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D111330

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
So, narrowed it down to Fedora build doing essentially (stripped down from =
all
languages etc.):
CC=3Dgcc \
CXX=3Dg++ \
CFLAGS=3D'-O2 -fexceptions -g -grecord-gcc-switches -Wall -Wformat-security
-Wp,-D_GLIBCXX_ASSERTIONS -mtune=3Dgeneric -fasynchronous-unwind-tables
-fstack-clash-protection -fcf-protection' \
CXXFLAGS=3D' -O2 -g -grecord-gcc-switches -Wformat -Wformat-security
-Wp,-D_GLIBCXX_ASSERTIONS -mtune=3Dgeneric -fasynchronous-unwind-tables
-fstack-clash-protection -fcf-protection ' \
XCFLAGS=3D'-O2 -fexceptions -g -grecord-gcc-switches -Wall -Wformat-security
-Wp,-D_GLIBCXX_ASSERTIONS -mtune=3Dgeneric -fasynchronous-unwind-tables
-fstack-clash-protection -fcf-protection' \
TCFLAGS=3D'-O2 -fexceptions -g -grecord-gcc-switches -Wall -Wformat-security
-Wp,-D_GLIBCXX_ASSERTIONS -mtune=3Dgeneric -fasynchronous-unwind-tables
-fstack-clash-protection -fcf-protection' \
../configure --disable-bootstrap --enable-languages=3Dc,c++,m2,lto
--enable-checking=3Drelease --enable-multilib --disable-libsanitizer
--with-gcc-major-version-only --enable-plugin --enable-gnu-indirect-function
--enable-cet --with-tune=3Dgeneric --with-arch_32=3Di686
--build=3Dx86_64-redhat-linux
make -j32 'BOOT_CFLAGS=3D-O2 -fexceptions -g -grecord-gcc-switches -Wall
-Wformat-security -Wp,-D_GLIBCXX_ASSERTIONS -mtune=3Dgeneric
-fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection'
LDFLAGS_FOR_TARGET=3D-Wl,-z,relro,-z,now

And what matters is using -Wall during the build in *FLAGS.
/builddir/build/BUILD/gcc-13.2.1-20230728/obj-x86_64-redhat-linux/./gcc/gm2
-B/builddir/build/BUILD/gcc-13.2.1-20230728/obj-x86_64-redhat-linux/./gcc/ =
-c
-O2 -Wall -fm2-pathname=3Dm2iso -I. -Ilibm2iso
-I/builddir/build/BUILD/gcc-13.2.1-20230728/gcc/m2/gm2-libs-iso
-fm2-pathname=3Dm2pim -I/builddir/build/BUILD/gcc-13.2.1-20230728/gcc/m2/gm=
2-libs
-fiso -fextended-opaque -fm2-g -g -Wreturn-type -fcase -fm2-prefix=3Dm2iso
../../../../libgm2/libm2iso/../../gcc/m2/gm2-libs-iso/SeqFile.mod  -fPIC -D=
PIC
-o .libs/SeqFile.o; echo $?
../../gcc/m2/gm2-compiler/M2SymInit.def:1:case statement has no matching
selection
1
while
/builddir/build/BUILD/gcc-13.2.1-20230728/obj-x86_64-redhat-linux/./gcc/gm2
-B/builddir/build/BUILD/gcc-13.2.1-20230728/obj-x86_64-redhat-linux/./gcc/ =
-c
-O2 -fm2-pathname=3Dm2iso -I. -Ilibm2iso
-I/builddir/build/BUILD/gcc-13.2.1-20230728/gcc/m2/gm2-libs-iso
-fm2-pathname=3Dm2pim -I/builddir/build/BUILD/gcc-13.2.1-20230728/gcc/m2/gm=
2-libs
-fiso -fextended-opaque -fm2-g -g -Wreturn-type -fcase -fm2-prefix=3Dm2iso
../../../../libgm2/libm2iso/../../gcc/m2/gm2-libs-iso/SeqFile.mod  -fPIC -D=
PIC
-o .libs/SeqFile.o; echo $?
0

Shouldn't -Wall affect just warnings (without -Werror) and not whether
compilation succeeds or fails?=