Hi:
Building gcc from the 'main' branch (4a8430c8c) and get this error during the 'libstdc++' automated build.
Short of using '-Wno-error=maybe-uninitialized' is there any other approach that can be adopted ?
...
Making all in c++23
make[6]: Entering directory '/opt/gcc/build/x86_64-pc-linux-gnu/libstdc++-v3/src/c++23'
/bin/sh ../../libtool --tag CXX --tag disable-shared --mode=compile /opt/gcc/build/./gcc/xgcc -shared-libgcc -B/opt/gcc/build/./gcc -nostdinc++ -L/opt/gcc/build/x86_64-pc-linux-gnu/libstdc++-v3/src -L/opt/gcc/build/x86_64-pc-linux-gnu/libstdc++-v3/src/.libs -L/opt/gcc/build/x86_64-pc-linux-gnu/libstdc++-v3/libsupc++/.libs -B/opt/gcc/x86_64-pc-linux-gnu/bin/ -B/opt/gcc/x86_64-pc-linux-gnu/lib/ -isystem /opt/gcc/x86_64-pc-linux-gnu/include -isystem /opt/gcc/x86_64-pc-linux-gnu/sys-include -fno-checking -I/opt/gcc/src/libstdc++-v3/../libgcc -I/opt/gcc/build/x86_64-pc-linux-gnu/libstdc++-v3/include/x86_64-pc-linux-gnu -I/opt/gcc/build/x86_64-pc-linux-gnu/libstdc++-v3/include -I/opt/gcc/src/libstdc++-v3/libsupc++ -std=gnu++23 -prefer-pic -D_GLIBCXX_SHARED -fno-implicit-templates -fvtable-verify=std -Wl,-u_vtable_map_vars_start,-u_vtable_map_vars_end -Wall -Wextra -Wwrite-strings -Wcast-qual -Wabi=2 -Werror -fdiagnostics-show-location=once -ffunction-sections -fdata-sections -fran
dom-seed=stacktrace.lo -fimplicit-templates -g -O2 -pipe -D_GNU_SOURCE -fcf-protection -mshstk -c -o stacktrace.lo /opt/gcc/src/libstdc++-v3/src/c++23/stacktrace.cc
/bin/sh ../../libtool --tag CXX --tag disable-shared --mode=compile /opt/gcc/build/./gcc/xgcc -shared-libgcc -B/opt/gcc/build/./gcc -nostdinc++ -L/opt/gcc/build/x86_64-pc-linux-gnu/libstdc++-v3/src -L/opt/gcc/build/x86_64-pc-linux-gnu/libstdc++-v3/src/.libs -L/opt/gcc/build/x86_64-pc-linux-gnu/libstdc++-v3/libsupc++/.libs -B/opt/gcc/x86_64-pc-linux-gnu/bin/ -B/opt/gcc/x86_64-pc-linux-gnu/lib/ -isystem /opt/gcc/x86_64-pc-linux-gnu/include -isystem /opt/gcc/x86_64-pc-linux-gnu/sys-include -fno-checking -I/opt/gcc/src/libstdc++-v3/../libgcc -I/opt/gcc/build/x86_64-pc-linux-gnu/libstdc++-v3/include/x86_64-pc-linux-gnu -I/opt/gcc/build/x86_64-pc-linux-gnu/libstdc++-v3/include -I/opt/gcc/src/libstdc++-v3/libsupc++ -std=gnu++23 -prefer-pic -D_GLIBCXX_SHARED -fno-implicit-templates -fvtable-verify=std -Wl,-u_vtable_map_vars_start,-u_vtable_map_vars_end -Wall -Wextra -Wwrite-strings -Wcast-qual -Wabi=2 -Werror -fdiagnostics-show-location=once -ffunction-sections -fdata-sections -fran
dom-seed=print.lo -fimplicit-templates -g -O2 -pipe -D_GNU_SOURCE -fcf-protection -mshstk -std=gnu++26 -c /opt/gcc/src/libstdc++-v3/src/c++23/print.cc
libtool: compile: /opt/gcc/build/./gcc/xgcc -shared-libgcc -B/opt/gcc/build/./gcc -nostdinc++ -L/opt/gcc/build/x86_64-pc-linux-gnu/libstdc++-v3/src -L/opt/gcc/build/x86_64-pc-linux-gnu/libstdc++-v3/src/.libs -L/opt/gcc/build/x86_64-pc-linux-gnu/libstdc++-v3/libsupc++/.libs -B/opt/gcc/x86_64-pc-linux-gnu/bin/ -B/opt/gcc/x86_64-pc-linux-gnu/lib/ -isystem /opt/gcc/x86_64-pc-linux-gnu/include -isystem /opt/gcc/x86_64-pc-linux-gnu/sys-include -fno-checking -I/opt/gcc/src/libstdc++-v3/../libgcc -I/opt/gcc/build/x86_64-pc-linux-gnu/libstdc++-v3/include/x86_64-pc-linux-gnu -I/opt/gcc/build/x86_64-pc-linux-gnu/libstdc++-v3/include -I/opt/gcc/src/libstdc++-v3/libsupc++ -std=gnu++23 -D_GLIBCXX_SHARED -fno-implicit-templates -fvtable-verify=std -Wl,-u_vtable_map_vars_start,-u_vtable_map_vars_end -Wall -Wextra -Wwrite-strings -Wcast-qual -Wabi=2 -Werror -fdiagnostics-show-location=once -ffunction-sections -fdata-sections -frandom-seed=print.lo -fimplicit-templates -g -O2 -pipe -D_GNU_SOURCE -fcf
-protection -mshstk -std=gnu++26 -c /opt/gcc/src/libstdc++-v3/src/c++23/print.cc -fPIC -DPIC -D_GLIBCXX_SHARED -o print.o
libtool: compile: /opt/gcc/build/./gcc/xgcc -shared-libgcc -B/opt/gcc/build/./gcc -nostdinc++ -L/opt/gcc/build/x86_64-pc-linux-gnu/libstdc++-v3/src -L/opt/gcc/build/x86_64-pc-linux-gnu/libstdc++-v3/src/.libs -L/opt/gcc/build/x86_64-pc-linux-gnu/libstdc++-v3/libsupc++/.libs -B/opt/gcc/x86_64-pc-linux-gnu/bin/ -B/opt/gcc/x86_64-pc-linux-gnu/lib/ -isystem /opt/gcc/x86_64-pc-linux-gnu/include -isystem /opt/gcc/x86_64-pc-linux-gnu/sys-include -fno-checking -I/opt/gcc/src/libstdc++-v3/../libgcc -I/opt/gcc/build/x86_64-pc-linux-gnu/libstdc++-v3/include/x86_64-pc-linux-gnu -I/opt/gcc/build/x86_64-pc-linux-gnu/libstdc++-v3/include -I/opt/gcc/src/libstdc++-v3/libsupc++ -std=gnu++23 -D_GLIBCXX_SHARED -fno-implicit-templates -fvtable-verify=std -Wl,-u_vtable_map_vars_start,-u_vtable_map_vars_end -Wall -Wextra -Wwrite-strings -Wcast-qual -Wabi=2 -Werror -fdiagnostics-show-location=once -ffunction-sections -fdata-sections -frandom-seed=stacktrace.lo -fimplicit-templates -g -O2 -pipe -D_GNU_SOURCE
-fcf-protection -mshstk -c /opt/gcc/src/libstdc++-v3/src/c++23/stacktrace.cc -fPIC -DPIC -D_GLIBCXX_SHARED -o stacktrace.o
/bin/sh ../../libtool --tag CXX --tag disable-shared --mode=link /opt/gcc/build/./gcc/xgcc -shared-libgcc -B/opt/gcc/build/./gcc -nostdinc++ -L/opt/gcc/build/x86_64-pc-linux-gnu/libstdc++-v3/src -L/opt/gcc/build/x86_64-pc-linux-gnu/libstdc++-v3/src/.libs -L/opt/gcc/build/x86_64-pc-linux-gnu/libstdc++-v3/libsupc++/.libs -B/opt/gcc/x86_64-pc-linux-gnu/bin/ -B/opt/gcc/x86_64-pc-linux-gnu/lib/ -isystem /opt/gcc/x86_64-pc-linux-gnu/include -isystem /opt/gcc/x86_64-pc-linux-gnu/sys-include -fno-checking -L/opt/gcc/build/x86_64-pc-linux-gnu/libstdc++-v3/../libvtv/.libs -Wl,--rpath -Wl,/opt/gcc/build/x86_64-pc-linux-gnu/libstdc++-v3/../libvtv/.libs -Wl,-O1 -Wl,-z,relro -Wl,--gc-sections -std=gnu++23 -prefer-pic -D_GLIBCXX_SHARED -fno-implicit-templates -fvtable-verify=std -Wl,-u_vtable_map_vars_start,-u_vtable_map_vars_end -Wall -Wextra -Wwrite-strings -Wcast-qual -Wabi=2 -Werror -fdiagnostics-show-location=once -ffunction-sections -fdata-sections -frandom-seed=libc++23convenience.la
-fimplicit-templates -o libc++23convenience.la stacktrace.lo print.lo
libtool: link: ar --plugin /usr/lib/gcc/x86_64-pc-linux-gnu/13.2.1/liblto_plugin.so --plugin /opt/gcc/build/./gcc/liblto_plugin.so rc .libs/libc++23convenience.a stacktrace.o print.o
libtool: link: ranlib --plugin /usr/lib/gcc/x86_64-pc-linux-gnu/13.2.1/liblto_plugin.so --plugin /opt/gcc/build/./gcc/liblto_plugin.so .libs/libc++23convenience.a
libtool: link: ( cd ".libs" && rm -f "libc++23convenience.la" && ln -s "../libc++23convenience.la" "libc++23convenience.la" )
make[6]: Leaving directory '/opt/gcc/build/x86_64-pc-linux-gnu/libstdc++-v3/src/c++23'
Making all in c++26
make[6]: Entering directory '/opt/gcc/build/x86_64-pc-linux-gnu/libstdc++-v3/src/c++26'
/bin/sh ../../libtool --tag CXX --tag disable-shared --mode=compile /opt/gcc/build/./gcc/xgcc -shared-libgcc -B/opt/gcc/build/./gcc -nostdinc++ -L/opt/gcc/build/x86_64-pc-linux-gnu/libstdc++-v3/src -L/opt/gcc/build/x86_64-pc-linux-gnu/libstdc++-v3/src/.libs -L/opt/gcc/build/x86_64-pc-linux-gnu/libstdc++-v3/libsupc++/.libs -B/opt/gcc/x86_64-pc-linux-gnu/bin/ -B/opt/gcc/x86_64-pc-linux-gnu/lib/ -isystem /opt/gcc/x86_64-pc-linux-gnu/include -isystem /opt/gcc/x86_64-pc-linux-gnu/sys-include -fno-checking -I/opt/gcc/src/libstdc++-v3/../libgcc -I/opt/gcc/build/x86_64-pc-linux-gnu/libstdc++-v3/include/x86_64-pc-linux-gnu -I/opt/gcc/build/x86_64-pc-linux-gnu/libstdc++-v3/include -I/opt/gcc/src/libstdc++-v3/libsupc++ -std=gnu++26 -prefer-pic -D_GLIBCXX_SHARED -fno-implicit-templates -fvtable-verify=std -Wl,-u_vtable_map_vars_start,-u_vtable_map_vars_end -Wall -Wextra -Wwrite-strings -Wcast-qual -Wabi=2 -Werror -fdiagnostics-show-location=once -ffunction-sections -fdata-sections -fran
dom-seed=text_encoding.lo -fimplicit-templates -g -O2 -pipe -D_GNU_SOURCE -fcf-protection -mshstk -c -o text_encoding.lo /opt/gcc/src/libstdc++-v3/src/c++26/text_encoding.cc
libtool: compile: /opt/gcc/build/./gcc/xgcc -shared-libgcc -B/opt/gcc/build/./gcc -nostdinc++ -L/opt/gcc/build/x86_64-pc-linux-gnu/libstdc++-v3/src -L/opt/gcc/build/x86_64-pc-linux-gnu/libstdc++-v3/src/.libs -L/opt/gcc/build/x86_64-pc-linux-gnu/libstdc++-v3/libsupc++/.libs -B/opt/gcc/x86_64-pc-linux-gnu/bin/ -B/opt/gcc/x86_64-pc-linux-gnu/lib/ -isystem /opt/gcc/x86_64-pc-linux-gnu/include -isystem /opt/gcc/x86_64-pc-linux-gnu/sys-include -fno-checking -I/opt/gcc/src/libstdc++-v3/../libgcc -I/opt/gcc/build/x86_64-pc-linux-gnu/libstdc++-v3/include/x86_64-pc-linux-gnu -I/opt/gcc/build/x86_64-pc-linux-gnu/libstdc++-v3/include -I/opt/gcc/src/libstdc++-v3/libsupc++ -std=gnu++26 -D_GLIBCXX_SHARED -fno-implicit-templates -fvtable-verify=std -Wl,-u_vtable_map_vars_start,-u_vtable_map_vars_end -Wall -Wextra -Wwrite-strings -Wcast-qual -Wabi=2 -Werror -fdiagnostics-show-location=once -ffunction-sections -fdata-sections -frandom-seed=text_encoding.lo -fimplicit-templates -g -O2 -pipe -D_GNU_SOU
RCE -fcf-protection -mshstk -c /opt/gcc/src/libstdc++-v3/src/c++26/text_encoding.cc -fPIC -DPIC -D_GLIBCXX_SHARED -o text_encoding.o
In file included from /opt/gcc/build/x86_64-pc-linux-gnu/libstdc++-v3/include/text_encoding:44,
from /opt/gcc/src/libstdc++-v3/src/c++26/text_encoding.cc:25:
In function ‘constexpr bool std::__unicode::__charset_alias_match(std::string_view, std::string_view)’,
inlined from ‘static constexpr bool std::text_encoding::_S_comp(std::string_view, std::string_view)’ at /opt/gcc/build/x86_64-pc-linux-gnu/libstdc++-v3/include/text_encoding:445:46,
inlined from ‘static constexpr const std::text_encoding::_Rep* std::text_encoding::_S_find_name(std::string_view)’ at /opt/gcc/build/x86_64-pc-linux-gnu/libstdc++-v3/include/text_encoding:461:13,
inlined from ‘constexpr std::text_encoding::text_encoding(std::string_view)’ at /opt/gcc/build/x86_64-pc-linux-gnu/libstdc++-v3/include/text_encoding:344:26,
inlined from ‘std::text_encoding std::__locale_encoding(const char*)’ at /opt/gcc/src/libstdc++-v3/src/c++26/text_encoding.cc:47:27:
/opt/gcc/build/x86_64-pc-linux-gnu/libstdc++-v3/include/bits/unicode.h:1099:14: error: ‘__val_a’ may be used uninitialized [-Werror=maybe-uninitialized]
1099 | else if (__val_a != __val_b)
| ^~
/opt/gcc/build/x86_64-pc-linux-gnu/libstdc++-v3/include/bits/unicode.h: In function ‘std::text_encoding std::__locale_encoding(const char*)’:
/opt/gcc/build/x86_64-pc-linux-gnu/libstdc++-v3/include/bits/unicode.h:1087:23: note: ‘__val_a’ was declared here
1087 | unsigned char __val_a, __val_b;
| ^~~~~~~
In function ‘constexpr bool std::__unicode::__charset_alias_match(std::string_view, std::string_view)’,
inlined from ‘bool std::text_encoding::_M_is_environment() const’ at /opt/gcc/src/libstdc++-v3/src/c++26/text_encoding.cc:73:42:
/opt/gcc/build/x86_64-pc-linux-gnu/libstdc++-v3/include/bits/unicode.h:1099:14: error: ‘__val_a’ may be used uninitialized [-Werror=maybe-uninitialized]
1099 | else if (__val_a != __val_b)
| ^~
/opt/gcc/build/x86_64-pc-linux-gnu/libstdc++-v3/include/bits/unicode.h: In member function ‘bool std::text_encoding::_M_is_environment() const’:
/opt/gcc/build/x86_64-pc-linux-gnu/libstdc++-v3/include/bits/unicode.h:1087:23: note: ‘__val_a’ was declared here
1087 | unsigned char __val_a, __val_b;
| ^~~~~~~
cc1plus: all warnings being treated as errors
make[6]: *** [Makefile:562: text_encoding.lo] Error 1
make[6]: Leaving directory '/opt/gcc/build/x86_64-pc-linux-gnu/libstdc++-v3/src/c++26'
make[5]: *** [Makefile:797: all-recursive] Error 1
make[5]: Leaving directory '/opt/gcc/build/x86_64-pc-linux-gnu/libstdc++-v3/src'
make[4]: *** [Makefile:577: all-recursive] Error 1
make[4]: Leaving directory '/opt/gcc/build/x86_64-pc-linux-gnu/libstdc++-v3'
make[3]: *** [Makefile:502: all] Error 2
make[3]: Leaving directory '/opt/gcc/build/x86_64-pc-linux-gnu/libstdc++-v3'
make[2]: *** [Makefile:17687: all-stage1-target-libstdc++-v3] Error 2
make[2]: Leaving directory '/opt/gcc/build'
make[1]: *** [Makefile:25945: stage1-bubble] Error 2
make[1]: Leaving directory '/opt/gcc/build'
make: *** [Makefile:1100: all] Error 2
make[1]: Entering directory '/opt/gcc/build'
/bin/sh /opt/gcc/src/mkinstalldirs /opt/gcc /opt/gcc
make[2]: Entering directory '/opt/gcc/build/fixincludes'
make[2]: *** No rule to make target 'install'. Stop.
make[2]: Leaving directory '/opt/gcc/build/fixincludes'
make[1]: *** [Makefile:4171: install-fixincludes] Error 2
make[1]: Leaving directory '/opt/gcc/build'
make: *** [Makefile:2690: install] Error 2
All suggestions are welcome.
warm regards
Saifi.
