From mboxrd@z Thu Jan 1 00:00:00 1970 From: Markus Mayer Date: Fri, 10 Jan 2020 11:17:47 -0800 Subject: [Buildroot] Kconfig warnings with GCC9 Message-ID: List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: buildroot@busybox.net Hi all, Using GCC9 (Ubuntu 19.10), I am getting some compiler warnings (potential buffer overruns) in the Kconfig code. Is this a known issue? Looks like GCC9 is pickier (yet again) than older versions. $ lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 19.10 Release: 19.10 Codename: eoan $ gcc -v Using built-in specs. COLLECT_GCC=gcc COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/9/lto-wrapper OFFLOAD_TARGET_NAMES=nvptx-none:hsa OFFLOAD_TARGET_DEFAULT=1 Target: x86_64-linux-gnu Configured with: ../src/configure -v --with-pkgversion='Ubuntu 9.2.1-9ubuntu2' --with-bugurl=file:///usr/share/doc/gcc-9/README.Bugs --enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++,gm2 --prefix=/usr --with-gcc-major-version-only --program-suffix=-9 --program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --libdir=/usr/lib --enable-nls --enable-bootstrap --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new --enable-gnu-unique-object --disable-vtable-verify --enable-plugin --enable-default-pie --with-system-zlib --with-target-system-zlib=auto --enable-multiarch --disable-werror --with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic --enable-offload-targets=nvptx-none,hsa --without-cuda-driver --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu Thread model: posix gcc version 9.2.1 20191008 (Ubuntu 9.2.1-9ubuntu2) My latest BR commit is: commit 84d471a0b150bc2ff1d08755d36be86d9380c2c5 (queue/master, master) Author: Peter Korsgaard Date: Fri Jan 10 08:33:58 2020 +0100 package/iputils: use relative symlink for ping6 Fixes (part of): http://autobuild.buildroot.net/results/5659e1c91831921bd9ad6af670258783771b4dc8/ $ mkdir -p output/rpi $ make O="/storage/Development/br-current/output/rpi" raspberrypi4_defconfig mkdir -p /storage/Development/br-current/output/rpi/build/buildroot-config/lxdialog PKG_CONFIG_PATH="" make CC="/usr/bin/gcc" HOSTCC="/usr/bin/gcc" \ obj=/storage/Development/br-current/output/rpi/build/buildroot-config -C support/kconfig -f Makefile.br conf /usr/bin/gcc -DCURSES_LOC="" -DLOCALE -I/storage/Development/br-current/output/rpi/build/buildroot-config -DCONFIG_=\"\" -MM *.c > /storage/Development/br-current/output/rpi/build/buildroot-config/.depend 2>/dev/null || : /usr/bin/gcc -DCURSES_LOC="" -DLOCALE -I/storage/Development/br-current/output/rpi/build/buildroot-config -DCONFIG_=\"\" -c conf.c -o /storage/Development/br-current/output/rpi/build/buildroot-config/conf.o /usr/bin/gcc -DCURSES_LOC="" -DLOCALE -I/storage/Development/br-current/output/rpi/build/buildroot-config -DCONFIG_=\"\" -I. -c /storage/Development/br-current/output/rpi/build/buildroot-config/zconf.tab.c -o /storage/Development/br-current/output/rpi/build/buildroot-config/zconf.tab.o In file included from /storage/Development/br-current/output/rpi/build/buildroot-config/zconf.tab.c:2484: ./util.c: In function ?file_write_dep?: ./util.c:54:18: warning: ?..config.tmp? directive writing 12 bytes into a region of size between 1 and 4097 [-Wformat-overflow=] 54 | sprintf(buf, "%s..config.tmp", dir); | ^~~~~~~~~~~~ ./util.c:54:2: note: ?sprintf? output between 13 and 4109 bytes into a destination of size 4097 54 | sprintf(buf, "%s..config.tmp", dir); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ In file included from /storage/Development/br-current/output/rpi/build/buildroot-config/zconf.tab.c:2485: ./confdata.c: In function ?conf_write?: ./confdata.c:778:23: warning: ?.tmpconfig.? directive writing 11 bytes into a region of size between 1 and 4097 [-Wformat-overflow=] 778 | sprintf(tmpname, "%s.tmpconfig.%d", dirname, (int)getpid()); | ^~~~~~~~~~~ ./confdata.c:778:3: note: ?sprintf? output between 13 and 4119 bytes into a destination of size 4097 778 | sprintf(tmpname, "%s.tmpconfig.%d", dirname, (int)getpid()); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ./confdata.c: In function ?conf_write_autoconf?: ./confdata.c:989:18: warning: ?.config.cmd? directive writing 11 bytes into a region of size between 1 and 4097 [-Wformat-overflow=] 989 | sprintf(buf, "%s.config.cmd", dir); | ^~~~~~~~~~~ ./confdata.c:989:2: note: ?sprintf? output between 12 and 4108 bytes into a destination of size 4097 989 | sprintf(buf, "%s.config.cmd", dir); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ./confdata.c:995:18: warning: ?.tmpconfig? directive writing 10 bytes into a region of size between 1 and 4097 [-Wformat-overflow=] 995 | sprintf(buf, "%s.tmpconfig", dir); | ^~~~~~~~~~ ./confdata.c:995:2: note: ?sprintf? output between 11 and 4107 bytes into a destination of size 4097 995 | sprintf(buf, "%s.tmpconfig", dir); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ./confdata.c:1000:18: warning: ?.tmpconfig_tristate? directive writing 19 bytes into a region of size between 1 and 4097 [-Wformat-overflow=] 1000 | sprintf(buf, "%s.tmpconfig_tristate", dir); | ^~~~~~~~~~~~~~~~~~~ ./confdata.c:1000:2: note: ?sprintf? output between 20 and 4116 bytes into a destination of size 4097 1000 | sprintf(buf, "%s.tmpconfig_tristate", dir); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ./confdata.c:1007:18: warning: ?.tmpconfig.h? directive writing 12 bytes into a region of size between 1 and 4097 [-Wformat-overflow=] 1007 | sprintf(buf, "%s.tmpconfig.h", dir); | ^~~~~~~~~~~~ ./confdata.c:1007:2: note: ?sprintf? output between 13 and 4109 bytes into a destination of size 4097 1007 | sprintf(buf, "%s.tmpconfig.h", dir); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ./confdata.c:1040:18: warning: ?.tmpconfig.h? directive writing 12 bytes into a region of size between 1 and 4097 [-Wformat-overflow=] 1040 | sprintf(buf, "%s.tmpconfig.h", dir); | ^~~~~~~~~~~~ ./confdata.c:1040:2: note: ?sprintf? output between 13 and 4109 bytes into a destination of size 4097 1040 | sprintf(buf, "%s.tmpconfig.h", dir); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ./confdata.c:1046:18: warning: ?.tmpconfig_tristate? directive writing 19 bytes into a region of size between 1 and 4097 [-Wformat-overflow=] 1046 | sprintf(buf, "%s.tmpconfig_tristate", dir); | ^~~~~~~~~~~~~~~~~~~ ./confdata.c:1046:2: note: ?sprintf? output between 20 and 4116 bytes into a destination of size 4097 1046 | sprintf(buf, "%s.tmpconfig_tristate", dir); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ./confdata.c:1054:18: warning: ?.tmpconfig? directive writing 10 bytes into a region of size between 1 and 4097 [-Wformat-overflow=] 1054 | sprintf(buf, "%s.tmpconfig", dir); | ^~~~~~~~~~ ./confdata.c:1054:2: note: ?sprintf? output between 11 and 4107 bytes into a destination of size 4097 1054 | sprintf(buf, "%s.tmpconfig", dir); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ /usr/bin/gcc -DCURSES_LOC="" -DLOCALE -I/storage/Development/br-current/output/rpi/build/buildroot-config -DCONFIG_=\"\" /storage/Development/br-current/output/rpi/build/buildroot-config/conf.o /storage/Development/br-current/output/rpi/build/buildroot-config/zconf.tab.o -o /storage/Development/br-current/output/rpi/build/buildroot-config/conf rm /storage/Development/br-current/output/rpi/build/buildroot-config/zconf.tab.c GEN /storage/Development/br-current/output/rpi/Makefile # # configuration written to /storage/Development/br-current/output/rpi/.config # Regards, -Markus