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From: "uaa at mx5 dot nisiq.net" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug libstdc++/107885] New: H8/300: libsupc++/hash_bytes.cc fix shift-count-overflow warning Date: Sun, 27 Nov 2022 00:12:24 +0000 [thread overview] Message-ID: <bug-107885-4@http.gcc.gnu.org/bugzilla/> (raw) https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107885 Bug ID: 107885 Summary: H8/300: libsupc++/hash_bytes.cc fix shift-count-overflow warning Product: gcc Version: 12.2.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: libstdc++ Assignee: unassigned at gcc dot gnu.org Reporter: uaa at mx5 dot nisiq.net Target Milestone: --- Created attachment 53974 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=53974&action=edit add cast to static_cast<unsigned char>(buf[x]) On building gcc-12.2.0 with newlib-4.1.0 (newlib and libgloss) and binutils-2.36.1 on Debian-11.5/amd64. gcc/config/h8300/t-h8300 is modified with: MULTILIB_OPTIONS = ms/msx mint32 MULTILIB_DIRNAMES = h8300s h8sx int32 to disable building H8 normal mode library. gcc configuration is: ../configure --target=h8300-unknown-elf --enable-languages=c,c++ \ --prefix=/home/uaa/h8300 --with-newlib --disable-nls --disable-libssp \ --disable-libgomp --disable-libstdcxx-pch \ --disable-libstdcxx-filesystem-ts --with-newlib --disable-wchar_t libstdc++-v3/libsupc++/hash_bytes.cc has warning, due to the size of int is 16bit (H8/300 default). /bin/bash ../libtool --tag CXX --tag disable-shared --mode=compile /home/uaa/gcc-12.2.0/h8300-unknown-elf/./gcc/xgcc -shared-libgcc -B/home/uaa/gcc-12.2.0/h8300-unknown-elf/./gcc -nostdinc++ -L/home/uaa/gcc-12.2.0/h8300-unknown-elf/h8300-unknown-elf/h8300s/libstdc++-v3/src -L/home/uaa/gcc-12.2.0/h8300-unknown-elf/h8300-unknown-elf/h8300s/libstdc++-v3/src/.libs -L/home/uaa/gcc-12.2.0/h8300-unknown-elf/h8300-unknown-elf/h8300s/libstdc++-v3/libsupc++/.libs -nostdinc -B/home/uaa/gcc-12.2.0/h8300-unknown-elf/h8300-unknown-elf/h8300s/newlib/ -isystem /home/uaa/gcc-12.2.0/h8300-unknown-elf/h8300-unknown-elf/h8300s/newlib/targ-include -isystem /home/uaa/gcc-12.2.0/newlib/libc/include -B/home/uaa/h8300/h8300-unknown-elf/bin/ -B/home/uaa/h8300/h8300-unknown-elf/lib/ -isystem /home/uaa/h8300/h8300-unknown-elf/include -isystem /home/uaa/h8300/h8300-unknown-elf/sys-include -ms -I/home/uaa/gcc-12.2.0/libstdc++-v3/../libgcc -I/home/uaa/gcc-12.2.0/h8300-unknown-elf/h8300-unknown-elf/h8300s/libstdc++-v3/include/h8300-unknown-elf -I/home/uaa/gcc-12.2.0/h8300-unknown-elf/h8300-unknown-elf/h8300s/libstdc++-v3/include -I/home/uaa/gcc-12.2.0/libstdc++-v3/libsupc++ -fno-implicit-templates -Wall -Wextra -Wwrite-strings -Wcast-qual -Wabi=2 -fdiagnostics-show-location=once -ffunction-sections -fdata-sections -frandom-seed=hash_bytes.lo -g -O2 -ms -c -o hash_bytes.lo ../../../../../libstdc++-v3/libsupc++/hash_bytes.cc libtool: compile: /home/uaa/gcc-12.2.0/h8300-unknown-elf/./gcc/xgcc -shared-libgcc -B/home/uaa/gcc-12.2.0/h8300-unknown-elf/./gcc -nostdinc++ -L/home/uaa/gcc-12.2.0/h8300-unknown-elf/h8300-unknown-elf/h8300s/libstdc++-v3/src -L/home/uaa/gcc-12.2.0/h8300-unknown-elf/h8300-unknown-elf/h8300s/libstdc++-v3/src/.libs -L/home/uaa/gcc-12.2.0/h8300-unknown-elf/h8300-unknown-elf/h8300s/libstdc++-v3/libsupc++/.libs -nostdinc -B/home/uaa/gcc-12.2.0/h8300-unknown-elf/h8300-unknown-elf/h8300s/newlib/ -isystem /home/uaa/gcc-12.2.0/h8300-unknown-elf/h8300-unknown-elf/h8300s/newlib/targ-include -isystem /home/uaa/gcc-12.2.0/newlib/libc/include -B/home/uaa/h8300/h8300-unknown-elf/bin/ -B/home/uaa/h8300/h8300-unknown-elf/lib/ -isystem /home/uaa/h8300/h8300-unknown-elf/include -isystem /home/uaa/h8300/h8300-unknown-elf/sys-include -ms -I/home/uaa/gcc-12.2.0/libstdc++-v3/../libgcc -I/home/uaa/gcc-12.2.0/h8300-unknown-elf/h8300-unknown-elf/h8300s/libstdc++-v3/include/h8300-unknown-elf -I/home/uaa/gcc-12.2.0/h8300-unknown-elf/h8300-unknown-elf/h8300s/libstdc++-v3/include -I/home/uaa/gcc-12.2.0/libstdc++-v3/libsupc++ -fno-implicit-templates -Wall -Wextra -Wwrite-strings -Wcast-qual -Wabi=2 -fdiagnostics-show-location=once -ffunction-sections -fdata-sections -frandom-seed=hash_bytes.lo -g -O2 -ms -c ../../../../../libstdc++-v3/libsupc++/hash_bytes.cc -o hash_bytes.o ../../../../../libstdc++-v3/libsupc++/hash_bytes.cc: In function 'std::size_t std::_Hash_bytes(const void*, size_t, size_t)': ../../../../../libstdc++-v3/libsupc++/hash_bytes.cc:97:52: warning: left shift count >= width of type [-Wshift-count-overflow] 97 | hash ^= static_cast<unsigned char>(buf[2]) << 16; | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~ suggested remedy is attached.
next reply other threads:[~2022-11-27 0:12 UTC|newest] Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-11-27 0:12 uaa at mx5 dot nisiq.net [this message] 2022-11-27 0:28 ` [Bug libstdc++/107885] " redi at gcc dot gnu.org 2022-11-28 10:51 ` redi at gcc dot gnu.org 2022-11-28 16:57 ` cvs-commit at gcc dot gnu.org 2022-11-28 17:02 ` redi at gcc dot gnu.org 2023-10-28 22:31 ` law at gcc dot gnu.org
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