https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122700
Bug ID: 122700
Summary: gcc: compilation fail due to -Wformat-truncation
Product: gcc
Version: 16.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: driver
Assignee: unassigned at gcc dot gnu.org
Reporter: Stromeko at nexgo dot de
Target Milestone: ---
Created attachment 62818
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=62818&action=edit
monkeypatch
/mnt/share/packages/gccmake/gcc-16/gcc/gcc.x86_64/build/./prev-gcc/xg++
-B/mnt/share/packages/gccmake/gcc-16/gcc/gcc.x86_64/build/./prev-gcc/
-B/usr/x86_64-pc-cygwin/bin/ -nostdinc++
-B/mnt/share/packages/gccmake/gcc-16/gcc/gcc.x86_64/build/prev-x86_64-pc-cygwin/libstdc++-v3/src/.libs
-B/mnt/share/packages/gccmake/gcc-16/gcc/gcc.x86_64/build/prev-x86_64-pc-cygwin/libstdc++-v3/libsupc++/.libs
-I/mnt/share/packages/gccmake/gcc-16/gcc/gcc.x86_64/build/prev-x86_64-pc-cygwin/libstdc++-v3/include/x86_64-pc-cygwin
-I/mnt/share/packages/gccmake/gcc-16/gcc/gcc.x86_64/build/prev-x86_64-pc-cygwin/libstdc++-v3/include
-I/mnt/share/packages/gccmake/gcc-16/gcc/gcc.x86_64/src/gcc-16-20251026/libstdc++-v3/libsupc++
-L/mnt/share/packages/gccmake/gcc-16/gcc/gcc.x86_64/build/prev-x86_64-pc-cygwin/libstdc++-v3/src/.libs
-L/mnt/share/packages/gccmake/gcc-16/gcc/gcc.x86_64/build/prev-x86_64-pc-cygwin/libstdc++-v3/libsupc++/.libs
-fno-PIE -c
-ffile-prefix-map=/mnt/share/packages/gccmake/gcc-16/gcc/gcc.x86_64/build=/usr/src/debug/gcc-16.0.0+20251026-0.1
-ffile-prefix-map=/mnt/share/packages/gccmake/gcc-16/gcc/gcc.x86_64/src/gcc-16-20251026=/usr/src/debug/gcc-16.0.0+20251026-0.1
-fno-checking -gtoggle -DIN_GCC -fno-exceptions -fno-rtti
-fasynchronous-unwind-tables -W -Wall -Wno-error=narrowing -Wwrite-strings
-Wcast-qual -Wmissing-format-attribute -Wconditionally-supported
-Woverloaded-virtual -pedantic -Wno-long-long -Wno-variadic-macros
-Wno-overlength-strings -Werror -DHAVE_CONFIG_H -fno-PIE -I. -I.
-I/mnt/share/packages/gccmake/gcc-16/gcc/gcc.x86_64/src/gcc-16-20251026/gcc
-I/mnt/share/packages/gccmake/gcc-16/gcc/gcc.x86_64/src/gcc-16-20251026/gcc/.
-I/mnt/share/packages/gccmake/gcc-16/gcc/gcc.x86_64/src/gcc-16-20251026/gcc/../include
-I/mnt/share/packages/gccmake/gcc-16/gcc/gcc.x86_64/src/gcc-16-20251026/gcc/../libcpp/include
-I/mnt/share/packages/gccmake/gcc-16/gcc/gcc.x86_64/src/gcc-16-20251026/gcc/../libcody
-I/mnt/share/packages/gccmake/gcc-16/gcc/gcc.x86_64/src/gcc-16-20251026/gcc/../libdecnumber
-I/mnt/share/packages/gccmake/gcc-16/gcc/gcc.x86_64/src/gcc-16-20251026/gcc/../libdecnumber/bid
-I../libdecnumber
-I/mnt/share/packages/gccmake/gcc-16/gcc/gcc.x86_64/src/gcc-16-20251026/gcc/../libbacktrace
-o opts.o -MT opts.o -MMD -MP -MF ./.deps/opts.TPo
/mnt/share/packages/gccmake/gcc-16/gcc/gcc.x86_64/src/gcc-16-20251026/gcc/opts.cc
/mnt/share/packages/gccmake/gcc-16/gcc/gcc.x86_64/src/gcc-16-20251026/gcc/opts.cc:
In function ‘void print_filtered_help(unsigned int, unsigned int, unsigned int,
unsigned int, gcc_options*, unsigned int)’:
/mnt/share/packages/gccmake/gcc-16/gcc/gcc.x86_64/src/gcc-16-20251026/gcc/opts.cc:1759:26:
error: ‘ ’ directive output may be truncated writing 2 bytes into a region of
size between 1 and 256 [-Werror=format-truncation=]
1759 | "%s %s", help, _(use_diagnosed_msg));
| ^~
/mnt/share/packages/gccmake/gcc-16/gcc/gcc.x86_64/src/gcc-16-20251026/gcc/opts.cc:1758:22:
note: ‘snprintf’ output 3 or more bytes (assuming 258) into a destination of
size 256
1758 | snprintf (new_help, sizeof new_help,
| ~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
1759 | "%s %s", help, _(use_diagnosed_msg));
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
cc1plus: all warnings being treated as errors
make[3]: *** [Makefile:1215: opts.o] Error 1
May be related to gcc#114374 as it started happening some time ago already.
