Greetings everybody, a rebuild of Debian with clang was done recently and it led to a segmentation fault for tcc when running the test. Also, several warning were issued by clang, which is better than gcc for static analysis as far as I know. The full log is attached to this email.
An example of warning:
tccpp.c:924:22: warning: array index of '2' indexes past the end of an array
(that contains 2 elements) [-Warray-bounds]
str[len++] = cv->tab[2];
I didn't look more into it as I lack of time these days.
Best regards,
Thomas Preud'homme
dpkg-buildpackage: source package tcc dpkg-buildpackage: source version 0.9.26~git20120104.83d57c0-4 dpkg-buildpackage: source changed by Thomas Preud'homme <[email protected]> dpkg-source --before-build tcc-0.9.26~git20120104.83d57c0 dpkg-source: info: using options from tcc-0.9.26~git20120104.83d57c0/debian/source/local-options: --extend-diff-ignore=(?:^|/)\.git(ignore|-dpm)?(?:$|/.*$) --extend-diff-ignore=(?:^|/)gbp\.conf(?:$|/.*$) --tar-ignore=.gitignore --tar-ignore=.git-dpm --tar-ignore=gbp.conf fakeroot debian/rules clean rm -f build dh clean dh_testdir debian/rules override_dh_auto_clean make[1]: Entering directory `/home/robotux/projects/perso/build-area/tcc/tcc-0.9.26~git20120104.83d57c0' [ ! -f config.mak ] || dh_auto_clean make[1]: Leaving directory `/home/robotux/projects/perso/build-area/tcc/tcc-0.9.26~git20120104.83d57c0' dh_clean dpkg-source -b tcc-0.9.26~git20120104.83d57c0 dpkg-source: info: using options from tcc-0.9.26~git20120104.83d57c0/debian/source/local-options: --extend-diff-ignore=(?:^|/)\.git(ignore|-dpm)?(?:$|/.*$) --extend-diff-ignore=(?:^|/)gbp\.conf(?:$|/.*$) --tar-ignore=.gitignore --tar-ignore=.git-dpm --tar-ignore=gbp.conf dpkg-source: info: using source format `3.0 (quilt)' dpkg-source: info: building tcc using existing ./tcc_0.9.26~git20120104.83d57c0.orig.tar.gz dpkg-source: info: building tcc in tcc_0.9.26~git20120104.83d57c0-4.debian.tar.gz dpkg-source: info: building tcc in tcc_0.9.26~git20120104.83d57c0-4.dsc dpkg-genchanges -S >../tcc_0.9.26~git20120104.83d57c0-4_source.changes dpkg-genchanges: not including original source code in upload dpkg-source --after-build tcc-0.9.26~git20120104.83d57c0 dpkg-source: info: using options from tcc-0.9.26~git20120104.83d57c0/debian/source/local-options: --extend-diff-ignore=(?:^|/)\.git(ignore|-dpm)?(?:$|/.*$) --extend-diff-ignore=(?:^|/)gbp\.conf(?:$|/.*$) --tar-ignore=.gitignore --tar-ignore=.git-dpm --tar-ignore=gbp.conf dpkg-buildpackage: binary and diff upload (original source NOT included) -> Copying COW directory forking: rm -rf /var/cache/pbuilder/build//cow.13826 forking: cp -al /var/cache/pbuilder/base.cow /var/cache/pbuilder/build//cow.13826 I: removed stale ilistfile /var/cache/pbuilder/build//cow.13826/.ilist forking: chroot /var/cache/pbuilder/build//cow.13826 cowdancer-ilistcreate /.ilist find . -xdev -path ./home -prune -o \( \( -type l -o -type f \) -a -links +1 -print0 \) | xargs -0 stat --format '%d %i ' -> Invoking pbuilder forking: pbuilder build --debbuildopts --debbuildopts --buildplace /var/cache/pbuilder/build//cow.13826 --buildresult /home/robotux/projects/perso/build-area/tcc --debbuildopts --no-targz --internal-chrootexec chroot /var/cache/pbuilder/build//cow.13826 cow-shell /home/robotux/projects/perso/build-area/tcc/tcc_0.9.26~git20120104.83d57c0-4.dsc I: Running in no-targz mode I: using fakeroot in build. I: Current time: Tue Mar 6 12:03:12 CET 2012 I: pbuilder-time-stamp: 1331031792 I: copying local configuration I: mounting /proc filesystem I: mounting /dev/pts filesystem I: Mounting /var/cache/pbuilder/ccache I: policy-rc.d already exists I: Obtaining the cached apt archive contents I: Setting up ccache I: Installing the build-deps -> Attempting to satisfy build-dependencies -> Creating pbuilder-satisfydepends-dummy package Package: pbuilder-satisfydepends-dummy Version: 0.invalid.0 Architecture: amd64 Maintainer: Debian Pbuilder Team <[email protected]> Description: Dummy package to satisfy dependencies with aptitude - created by pbuilder This package was created automatically by pbuilder to satisfy the build-dependencies of the package being currently built. Depends: debhelper (>= 8.1.3), texi2html, texinfo, perl, clang dpkg-deb: building package `pbuilder-satisfydepends-dummy' in `/tmp/satisfydepends-aptitude/pbuilder-satisfydepends-dummy.deb'. Selecting previously unselected package pbuilder-satisfydepends-dummy. (Reading database ... 11845 files and directories currently installed.) Unpacking pbuilder-satisfydepends-dummy (from .../pbuilder-satisfydepends-dummy.deb) ... dpkg: pbuilder-satisfydepends-dummy: dependency problems, but configuring anyway as you requested: pbuilder-satisfydepends-dummy depends on debhelper (>= 8.1.3); however: Package debhelper is not installed. pbuilder-satisfydepends-dummy depends on texi2html; however: Package texi2html is not installed. pbuilder-satisfydepends-dummy depends on texinfo; however: Package texinfo is not installed. pbuilder-satisfydepends-dummy depends on clang; however: Package clang is not installed. Setting up pbuilder-satisfydepends-dummy (0.invalid.0) ... Reading package lists... Building dependency tree... Reading state information... Initializing package states... Writing extended state information... The following NEW packages will be installed: bsdmainutils{a} clang{a} debhelper{a} file{a} gettext{a} gettext-base{a} groff-base{a} html2text{a} intltool-debian{a} libclang-common-dev{a} libcroco3{a} libffi5{a} libglib2.0-0{a} libllvm3.0{a} libmagic1{a} libpcre3{a} libpipeline1{a} libunistring0{a} libxml2{a} man-db{a} po-debconf{a} texi2html{a} texinfo{a} 0 packages upgraded, 23 newly installed, 0 to remove and 0 not upgraded. Need to get 0 B/23.6 MB of archives. After unpacking 66.8 MB will be used. Writing extended state information... debconf: delaying package configuration, since apt-utils is not installed Selecting previously unselected package libpipeline1. (Reading database ... 11845 files and directories currently installed.) Unpacking libpipeline1 (from .../libpipeline1_1.2.1-1_amd64.deb) ... Selecting previously unselected package libmagic1. Unpacking libmagic1 (from .../libmagic1_5.10-1_amd64.deb) ... Selecting previously unselected package libpcre3. Unpacking libpcre3 (from .../libpcre3_8.12-4_amd64.deb) ... Selecting previously unselected package libffi5. Unpacking libffi5 (from .../libffi5_3.0.10-3_amd64.deb) ... Selecting previously unselected package libglib2.0-0. Unpacking libglib2.0-0 (from .../libglib2.0-0_2.30.2-6_amd64.deb) ... Selecting previously unselected package libxml2. Unpacking libxml2 (from .../libxml2_2.7.8.dfsg-7_amd64.deb) ... Selecting previously unselected package libcroco3. Unpacking libcroco3 (from .../libcroco3_0.6.4-2_amd64.deb) ... Selecting previously unselected package libllvm3.0. Unpacking libllvm3.0 (from .../libllvm3.0_3.0-5_amd64.deb) ... Selecting previously unselected package libunistring0. Unpacking libunistring0 (from .../libunistring0_0.9.3-5_amd64.deb) ... Selecting previously unselected package bsdmainutils. Unpacking bsdmainutils (from .../bsdmainutils_9.0.1_amd64.deb) ... Selecting previously unselected package groff-base. Unpacking groff-base (from .../groff-base_1.21-6_amd64.deb) ... Selecting previously unselected package man-db. Unpacking man-db (from .../man-db_2.6.1-1_amd64.deb) ... Selecting previously unselected package file. Unpacking file (from .../archives/file_5.10-1_amd64.deb) ... Selecting previously unselected package gettext-base. Unpacking gettext-base (from .../gettext-base_0.18.1.1-5_amd64.deb) ... Selecting previously unselected package texinfo. Unpacking texinfo (from .../texinfo_4.13a.dfsg.1-8_amd64.deb) ... Selecting previously unselected package libclang-common-dev. Unpacking libclang-common-dev (from .../libclang-common-dev_3.0-6_amd64.deb) ... Selecting previously unselected package clang. Unpacking clang (from .../archives/clang_3.0-6_amd64.deb) ... Selecting previously unselected package html2text. Unpacking html2text (from .../html2text_1.3.2a-15_amd64.deb) ... Selecting previously unselected package gettext. Unpacking gettext (from .../gettext_0.18.1.1-5_amd64.deb) ... Selecting previously unselected package intltool-debian. Unpacking intltool-debian (from .../intltool-debian_0.35.0+20060710.1_all.deb) ... Selecting previously unselected package po-debconf. Unpacking po-debconf (from .../po-debconf_1.0.16+nmu2_all.deb) ... Selecting previously unselected package debhelper. Unpacking debhelper (from .../debhelper_9.20120115_all.deb) ... Selecting previously unselected package texi2html. Unpacking texi2html (from .../texi2html_1.82-1_all.deb) ... Setting up libpipeline1 (1.2.1-1) ... Setting up libmagic1 (5.10-1) ... Setting up libpcre3 (8.12-4) ... Setting up libffi5 (3.0.10-3) ... Setting up libglib2.0-0 (2.30.2-6) ... No schema files found: doing nothing. Setting up libxml2 (2.7.8.dfsg-7) ... Setting up libcroco3 (0.6.4-2) ... Setting up libllvm3.0 (3.0-5) ... Setting up libunistring0 (0.9.3-5) ... Setting up bsdmainutils (9.0.1) ... update-alternatives: using /usr/bin/bsd-write to provide /usr/bin/write (write) in auto mode. update-alternatives: using /usr/bin/bsd-from to provide /usr/bin/from (from) in auto mode. Setting up groff-base (1.21-6) ... Setting up man-db (2.6.1-1) ... Building database of manual pages ... Setting up file (5.10-1) ... Setting up gettext-base (0.18.1.1-5) ... Setting up texinfo (4.13a.dfsg.1-8) ... Setting up libclang-common-dev (3.0-6) ... Setting up clang (3.0-6) ... Setting up html2text (1.3.2a-15) ... Setting up gettext (0.18.1.1-5) ... Setting up intltool-debian (0.35.0+20060710.1) ... Setting up po-debconf (1.0.16+nmu2) ... Setting up debhelper (9.20120115) ... Setting up texi2html (1.82-1) ... Reading package lists... Building dependency tree... Reading state information... Reading extended state information... Initializing package states... Writing extended state information... -> Finished parsing the build-deps Reading package lists... Building dependency tree... Reading state information... The following NEW packages will be installed: fakeroot debconf: delaying package configuration, since apt-utils is not installed 0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded. Need to get 0 B/108 kB of archives. After this operation, 324 kB of additional disk space will be used. Selecting previously unselected package fakeroot. (Reading database ... 13481 files and directories currently installed.) Unpacking fakeroot (from .../fakeroot_1.18.2-1_amd64.deb) ... Processing triggers for man-db ... Setting up fakeroot (1.18.2-1) ... update-alternatives: using /usr/bin/fakeroot-sysv to provide /usr/bin/fakeroot (fakeroot) in auto mode. I: Copying back the cached apt archive contents I: Copying source file I: copying [/home/robotux/projects/perso/build-area/tcc/tcc_0.9.26~git20120104.83d57c0-4.dsc] I: copying [/home/robotux/projects/perso/build-area/tcc/tcc_0.9.26~git20120104.83d57c0.orig.tar.gz] I: copying [/home/robotux/projects/perso/build-area/tcc/tcc_0.9.26~git20120104.83d57c0-4.debian.tar.gz] I: Extracting source dpkg-source: warning: extracting unsigned source package (tcc_0.9.26~git20120104.83d57c0-4.dsc) dpkg-source: info: extracting tcc in tcc-0.9.26~git20120104.83d57c0 dpkg-source: info: unpacking tcc_0.9.26~git20120104.83d57c0.orig.tar.gz dpkg-source: info: unpacking tcc_0.9.26~git20120104.83d57c0-4.debian.tar.gz dpkg-source: info: applying 0001-Compile-tccasm.c-conditionally-TCC_CONFIG_ASM.patch dpkg-source: info: applying 0002-Fix-a-typo-in-an-error-about-size-with-bounded-ptr.patch dpkg-source: info: applying 0003-i386-fix-loading-of-LLOCAL-floats.patch dpkg-source: info: applying 0004-x86_64-fix-loading-of-LLOCAL-floats.patch I: Building the package I: Running cd tmp/buildd/*/ && env PATH="/usr/lib/ccache:/usr/sbin:/usr/bin:/sbin:/bin:/usr/X11R6/bin" dpkg-buildpackage -us -uc -rfakeroot dpkg-buildpackage: source package tcc dpkg-buildpackage: source version 0.9.26~git20120104.83d57c0-4 dpkg-buildpackage: source changed by Thomas Preud'homme <[email protected]> dpkg-source --before-build tcc-0.9.26~git20120104.83d57c0 dpkg-buildpackage: host architecture amd64 fakeroot debian/rules clean rm -f build dh clean dh_testdir debian/rules override_dh_auto_clean make[1]: Entering directory `/tmp/buildd/tcc-0.9.26~git20120104.83d57c0' [ ! -f config.mak ] || dh_auto_clean make[1]: Leaving directory `/tmp/buildd/tcc-0.9.26~git20120104.83d57c0' dh_clean dpkg-source -b tcc-0.9.26~git20120104.83d57c0 dpkg-source: info: using source format `3.0 (quilt)' dpkg-source: info: building tcc using existing ./tcc_0.9.26~git20120104.83d57c0.orig.tar.gz dpkg-source: info: building tcc in tcc_0.9.26~git20120104.83d57c0-4.debian.tar.gz dpkg-source: info: building tcc in tcc_0.9.26~git20120104.83d57c0-4.dsc debian/rules build dh build dh_testdir debian/rules override_dh_auto_configure make[1]: Entering directory `/tmp/buildd/tcc-0.9.26~git20120104.83d57c0' ./configure --prefix=/usr \ --tccdir=../tcc \ --docdir=/usr/share/doc/tcc \ --libdir=/usr/lib/x86_64-linux-gnu \ --crtprefix=/usr/lib/x86_64-linux-gnu \ --sysincludepaths=/usr/local/include:/usr/include/x86_64-linux-gnu:/usr/include:{B}/include \ --libpaths=/usr/lib/x86_64-linux-gnu:/usr/lib:/lib/x86_64-linux-gnu:/lib:/usr/local/lib \ --cc=clang Binary directory /usr/bin TinyCC directory /usr/lib/x86_64-linux-gnu/../tcc Library directory /usr/lib/x86_64-linux-gnu Include directory /usr/include Manual directory /usr/share/man Info directory /usr/share/info Doc directory /usr/share/doc/tcc Target root prefix Source path /tmp/buildd/tcc-0.9.26~git20120104.83d57c0 C compiler clang CPU x86-64 Big Endian no gprof enabled no cross compilers no use libgcc no Creating config.mak and config.h make[1]: Leaving directory `/tmp/buildd/tcc-0.9.26~git20120104.83d57c0' dh_auto_build make[1]: Entering directory `/tmp/buildd/tcc-0.9.26~git20120104.83d57c0' clang -o tcc.o -c tcc.c -DTCC_TARGET_X86_64 -DTCC_TARGET_X86_64_CENTOS -g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Wformat-security -Werror=format-security -fno-strict-aliasing -Wno-pointer-sign -Wno-sign-compare -D_FORTIFY_SOURCE=0 clang: warning: argument unused during compilation: '--param ssp-buffer-size=4' clang -o libtcc.o -c libtcc.c -DTCC_TARGET_X86_64 -DTCC_TARGET_X86_64_CENTOS -g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Wformat-security -Werror=format-security -fno-strict-aliasing -Wno-pointer-sign -Wno-sign-compare -D_FORTIFY_SOURCE=0 clang: warning: argument unused during compilation: '--param ssp-buffer-size=4' clang -o tccpp.o -c tccpp.c -DTCC_TARGET_X86_64 -DTCC_TARGET_X86_64_CENTOS -g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Wformat-security -Werror=format-security -fno-strict-aliasing -Wno-pointer-sign -Wno-sign-compare -D_FORTIFY_SOURCE=0 clang: warning: argument unused during compilation: '--param ssp-buffer-size=4' tccpp.c:278:22: warning: length modifier 'L' results in undefined behavior or no effect with 'u' conversion specifier [-Wformat] sprintf(p, "%Lu", cv->ull); ~^~ tccpp.c:924:22: warning: array index of '2' indexes past the end of an array (that contains 2 elements) [-Warray-bounds] str[len++] = cv->tab[2]; ^ ~ ./tcc.h:264:5: note: array 'tab' declared here int tab[2]; ^ tccpp.c:925:22: warning: array index of '3' indexes past the end of an array (that contains 2 elements) [-Warray-bounds] str[len++] = cv->tab[3]; ^ ~ ./tcc.h:264:5: note: array 'tab' declared here int tab[2]; ^ 3 warnings generated. clang -o tccgen.o -c tccgen.c -DTCC_TARGET_X86_64 -DTCC_TARGET_X86_64_CENTOS -g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Wformat-security -Werror=format-security -fno-strict-aliasing -Wno-pointer-sign -Wno-sign-compare -D_FORTIFY_SOURCE=0 clang: warning: argument unused during compilation: '--param ssp-buffer-size=4' tccgen.c:713:17: warning: array index of '2' indexes past the end of an array (that contains 2 elements) [-Warray-bounds] vtop->c.tab[2] &= 0xffff; ^ ~ ./tcc.h:264:5: note: array 'tab' declared here int tab[2]; ^ tccgen.c:715:17: warning: array index of '3' indexes past the end of an array (that contains 2 elements) [-Warray-bounds] vtop->c.tab[3] = 0; ^ ~ ./tcc.h:264:5: note: array 'tab' declared here int tab[2]; ^ 2 warnings generated. clang -o tccelf.o -c tccelf.c -DTCC_TARGET_X86_64 -DTCC_TARGET_X86_64_CENTOS -g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Wformat-security -Werror=format-security -fno-strict-aliasing -Wno-pointer-sign -Wno-sign-compare -D_FORTIFY_SOURCE=0 clang: warning: argument unused during compilation: '--param ssp-buffer-size=4' clang -o tccasm.o -c tccasm.c -DTCC_TARGET_X86_64 -DTCC_TARGET_X86_64_CENTOS -g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Wformat-security -Werror=format-security -fno-strict-aliasing -Wno-pointer-sign -Wno-sign-compare -D_FORTIFY_SOURCE=0 clang: warning: argument unused during compilation: '--param ssp-buffer-size=4' tccasm.c:541:72: warning: data argument not used by format string [-Wformat-extra-args] sprintf(sname, (n?".%s%d":".%s"), get_tok_str(tok1, NULL), n); ~~~~~ ^ 1 warning generated. clang -o tccrun.o -c tccrun.c -DTCC_TARGET_X86_64 -DTCC_TARGET_X86_64_CENTOS -g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Wformat-security -Werror=format-security -fno-strict-aliasing -Wno-pointer-sign -Wno-sign-compare -D_FORTIFY_SOURCE=0 clang: warning: argument unused during compilation: '--param ssp-buffer-size=4' clang -o x86_64-gen.o -c x86_64-gen.c -DTCC_TARGET_X86_64 -DTCC_TARGET_X86_64_CENTOS -g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Wformat-security -Werror=format-security -fno-strict-aliasing -Wno-pointer-sign -Wno-sign-compare -D_FORTIFY_SOURCE=0 clang: warning: argument unused during compilation: '--param ssp-buffer-size=4' clang -o i386-asm.o -c i386-asm.c -DTCC_TARGET_X86_64 -DTCC_TARGET_X86_64_CENTOS -g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Wformat-security -Werror=format-security -fno-strict-aliasing -Wno-pointer-sign -Wno-sign-compare -D_FORTIFY_SOURCE=0 clang: warning: argument unused during compilation: '--param ssp-buffer-size=4' ar rcs libtcc.a libtcc.o tccpp.o tccgen.o tccelf.o tccasm.o tccrun.o x86_64-gen.o i386-asm.o clang -o tcc tcc.o libtcc.a -lm -ldl -Wl,-z,relro make[2]: Entering directory `/tmp/buildd/tcc-0.9.26~git20120104.83d57c0/lib' mkdir -p x86_64 gcc -O2 -c libtcc1.c -o x86_64/libtcc1.o -DTCC_TARGET_X86_64 gcc -O2 -c alloca86_64.S -o x86_64/alloca86_64.o -DTCC_TARGET_X86_64 ar rcs ../libtcc1.a x86_64/libtcc1.o x86_64/alloca86_64.o make[2]: Leaving directory `/tmp/buildd/tcc-0.9.26~git20120104.83d57c0/lib' ./texi2pod.pl tcc-doc.texi tcc.pod pod2man --section=1 --center=" " --release=" " tcc.pod > tcc.1 texi2html -monolithic -number tcc-doc.texi ** No node following `devel' in menu, but `Concept Index' follows in sectionning makeinfo tcc-doc.texi make[1]: Leaving directory `/tmp/buildd/tcc-0.9.26~git20120104.83d57c0' dh_auto_test make[1]: Entering directory `/tmp/buildd/tcc-0.9.26~git20120104.83d57c0' make -C tests test make[2]: Entering directory `/tmp/buildd/tcc-0.9.26~git20120104.83d57c0/tests' clang -o libtcc_test libtcc_test.c ../libtcc.a -I.. -g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Wformat-security -Werror=format-security -fno-strict-aliasing -Wno-pointer-sign -Wno-sign-compare -D_FORTIFY_SOURCE=0 -lm -ldl clang: warning: argument unused during compilation: '--param ssp-buffer-size=4' ------------ libtest ------------ ./libtcc_test lib_path=.. Hello World! fib(32) = 2178309 add(32, 64) = 96 cp -u ../include/tcclib.h . clang -o tcctest.gcc tcctest.c -I. -w -g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Wformat-security -Werror=format-security -fno-strict-aliasing -Wno-pointer-sign -Wno-sign-compare -D_FORTIFY_SOURCE=0 -std=gnu99 clang: warning: argument unused during compilation: '--param ssp-buffer-size=4' ./tcctest.gcc > test.ref Segmentation fault make[2]: *** [test.ref] Error 139 make[2]: Leaving directory `/tmp/buildd/tcc-0.9.26~git20120104.83d57c0/tests' make[1]: *** [test] Error 2 make[1]: Leaving directory `/tmp/buildd/tcc-0.9.26~git20120104.83d57c0' dh_auto_test: make -j1 test returned exit code 2 make: *** [build] Error 29 dpkg-buildpackage: error: debian/rules build gave error exit status 2 E: Failed autobuilding of package I: unmounting /var/cache/pbuilder/ccache filesystem I: unmounting dev/pts filesystem I: unmounting proc filesystem -> Cleaning COW directory forking: rm -rf /var/cache/pbuilder/build//cow.13826
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