https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77710
--- Comment #4 from Thomas Preud'homme <thopre01 at gcc dot gnu.org> --- (In reply to Martin Sebor from comment #3) > With GCC 7.0.0 20160927 configured with --build=x86_64-pc-linux-gnu > --host=x86_64-pc-linux-gnu --target=arm-none-eabi I get the expected output > (below). I see failures in other tests in the results reported for > arm-unknown-linux-gnueabihf below but none in the builtin-sprintf-warn-4.c > test: > https://gcc.gnu.org/ml/gcc-testresults/2016-09/msg02201.html > > Can you please check again? > > /src/gcc/trunk/gcc/testsuite/gcc.dg/tree-ssa/builtin-sprintf-warn-4.c:10:24: > warning: writing a terminating nul past the end of the destination > [-Wformat-length=] > sprintf (dst + 7, "%-s", "1"); > ~~^~ > /src/gcc/trunk/gcc/testsuite/gcc.dg/tree-ssa/builtin-sprintf-warn-4.c:10:3: > note: format output 2 bytes into a destination of size 1 > sprintf (dst + 7, "%-s", "1"); > ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > /src/gcc/trunk/gcc/testsuite/gcc.dg/tree-ssa/builtin-sprintf-warn-4.c:22:22: > warning: '%-s' directive writing 4 bytes into a region of size 1 > [-Wformat-length=] > sprintf (dst + 7, "%-s", "abcd"); > ^~~ ~~~~~~ > /src/gcc/trunk/gcc/testsuite/gcc.dg/tree-ssa/builtin-sprintf-warn-4.c:22:3: > note: format output 5 bytes into a destination of size 1 > sprintf (dst + 7, "%-s", "abcd"); > ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ At r240573 I still get: % build/gcc/xgcc -v Using built-in specs. COLLECT_GCC=build/gcc/xgcc Target: arm-none-eabi Configured with: src/configure --prefix=install --target=arm-none-eabi --enable-languages=c,c++ --with-cpu=cortex-m0 --with-mode=thumb --with-newlib --with-headers=src/newlib/libc/include --enable-newlib-register-fini --disable-newlib-supplied-syscalls --disable-multilib --with-libexpat --with-system-zlib --disable-gdbtk --enable-plugins --disable-libgomp --disable-libmudflap --disable-libquadmath --disable-libssp --disable-libstdcxx-pch --disable-nls --disable-rda --disable-sid --disable-tui --disable-utils --disable-werror --disable-fixed-point Thread model: single gcc version 7.0.0 20160928 (experimental) (GCC) % grep -A 2 FAIL build/gcc/testsuite/gcc/gcc.logFAIL: gcc.dg/tree-ssa/builtin-sprintf-warn-4.c (test for excess errors) Excess errors: src/gcc/testsuite/gcc.dg/tree-ssa/builtin-sprintf-warn-4.c:10:24: warning: writing a terminating nul past the end of the destination [-Wformat-length=]src/gcc/testsuite/gcc.dg/tree-ssa/builtin-sprintf-warn-4.c:22:22: warning: '%-s' directive writing 4 bytes into a region of size 1 [-Wformat-length=] I'll try to investigate myself since it is difficult to reproduce it for you. Best regards, Thomas
