If I build an executable using -lc_p option of gcc to get the profile information, the executable always generate SIGFPE before entering main() function. By the way, It seems fine if I only use -pg option of gcc, it works fine. Reproducible: Always Steps to Reproduce: 1. $ cat nop.c int main(void) { return 0; } 2. $ gcc -pg nop.c -lc_p $ ./a.out Floating point exception 3. Actual Results: $ ./a.out Floating point exception $ gdb -q a.out (no debugging symbols found) Using host libthread_db library "/lib/libthread_db.so.1". (gdb) r Starting program: /home/cinsk/Documents/pesticide/a.out Program received signal SIGFPE, Arithmetic exception. 0x08054aad in profil () (gdb) bt #0 0x08054aad in profil () #1 0x0805477d in moncontrol () #2 0x0804d0b2 in __gmon_start__ () #3 0xb7eff6b2 in ?? () from /usr/lib/gcc/i686-pc-linux-gnu/4.1.2/libgcc_s.so.1 #4 0x00000001 in ?? () #5 0xb7f45fc4 in ?? () from /lib/ld-linux.so.2 #6 0xbf81aa98 in ?? () #7 0xb7eff497 in ?? () from /usr/lib/gcc/i686-pc-linux-gnu/4.1.2/libgcc_s.so.1 #8 0xb7f082b0 in ?? () #9 0xb7dce000 in ?? () #10 0xbf81aac8 in ?? () #11 0xb7f38c45 in call_init (l=0xb7f08000, argc=134881060, argv=0x1, env=0xb7f082b0) at dl-init.c:70 Backtrace stopped: previous frame inner to this frame (corrupt stack?) Expected Results: The generated executable should not cause SIGFPE. # emerge -pv glibc gcc binutils These are the packages that would be merged, in order: Calculating dependencies... done! [ebuild R ] sys-devel/binutils-2.18-r3 USE="nls -multislot -multitarget -test -vanilla" 0 kB [ebuild R ] sys-devel/gcc-4.1.2 USE="fortran gtk mudflap nls (-altivec) -bootstrap -build -d -doc -gcj (-hardened) -ip28 -ip32r10k -libffi% (-multilib) -multislot (-n32) (-n64) -nocxx -objc -objc++ -objc-gc -test -vanilla" 38,847 kB [ebuild R ] sys-libs/glibc-2.6.1 USE="gd nls profile -debug -glibc-omitfp (-hardened) (-multilib) (-selinux) -vanilla" 16,007 kB Total: 3 packages (3 reinstalls), Size of downloads: 54,854 kB # uname -a Linux shar 2.6.23-gentoo-r9 #1 SMP Fri Mar 7 09:05:21 KST 2008 i686 Intel(R) Pentium(R) 4 CPU 2.60GHz GenuineIntel GNU/Linux # emerge --info Portage 2.1.4.4 (default-linux/x86/2007.0/desktop, gcc-4.1.2, glibc-2.6.1-r0, 2.6.23-gentoo-r9 i686) ================================================================= System uname: 2.6.23-gentoo-r9 i686 Intel(R) Pentium(R) 4 CPU 2.60GHz Timestamp of tree: Thu, 28 Aug 2008 23:00:01 +0000 distcc 2.18.3 i686-pc-linux-gnu (protocols 1 and 2) (default port 3632) [enabled] ccache version 2.4 [enabled] app-shells/bash: 3.2_p33 dev-java/java-config: 1.3.7, 2.1.6 dev-lang/python: 2.5.2-r6 dev-python/pycrypto: 2.0.1-r6 dev-util/ccache: 2.4-r7 sys-apps/baselayout: 1.12.11.1 sys-apps/sandbox: 1.2.18.1-r2 sys-devel/autoconf: 2.13, 2.61-r2 sys-devel/automake: 1.4_p6, 1.5, 1.6.3, 1.7.9-r1, 1.8.5-r3, 1.9.6-r2, 1.10.1 sys-devel/binutils: 2.18-r3 sys-devel/gcc-config: 1.4.0-r4 sys-devel/libtool: 1.5.26 virtual/os-headers: 2.6.23-r3 ACCEPT_KEYWORDS="x86" CBUILD="i686-pc-linux-gnu" CFLAGS="-march=pentium4 -ggdb -O2 -pipe" CHOST="i686-pc-linux-gnu" CONFIG_PROTECT="/etc /opt/openfire/resources/security/ /usr/kde/3.3/env /usr/kde/3.3/share/config /usr/kde/3.3/shutdown /usr/kde/3.4/env /usr/kde/3.4/share/config /usr/kde/3.4/shutdown /usr/kde/3.5/env /usr/kde/3.5/share/config /usr/kde/3.5/shutdown /usr/share/config" CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/env.d /etc/env.d/java/ /etc/fonts/fonts.conf /etc/gconf /etc/revdep-rebuild /etc/terminfo /etc/texmf/web2c /etc/udev/rules.d" CXXFLAGS="-march=pentium4 -ggdb -O2 -pipe" DISTDIR="/usr/portage/distfiles" FEATURES="ccache distcc distlocks metadata-transfer sandbox sfperms splitdebug strict unmerge-orphans userfetch" GENTOO_MIRRORS="http://gentoo.gg3.net/ http://ftp.kaist.ac.kr/pub/gentoo http://ftp.gentoo.or.kr http://gentoo.osuosl.org http://www.ibiblio.org/pub/Linux/distributions/gentoo" LANG="ko_KR.UTF8" LINGUAS="en ko" PKGDIR="/usr/portage/packages" PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --compress --force --whole-file --delete --stats --timeout=180 --exclude=/distfiles --exclude=/local --exclude=/packages" PORTAGE_TMPDIR="/var/tmp" PORTDIR="/usr/portage" PORTDIR_OVERLAY="/usr/local/portage /usr/portage/local/layman/sunrise" SYNC="rsync://rsync.gentoo.org/gentoo-portage" USE="X acl acpi alsa arts bash-completion berkdb bzip2 cairo cdr cjk cli cracklib crypt cups dbus dri dvd dvdr dvdread eds emacs emboss encode esd evo fam firefox fortran gdbm gif gnome gpm gstreamer gtk hal iconv isdnlog jpeg kerberos ldap mad midi mikmod mmx mmx2 mp3 mpeg mudflap ncurses nls nptl nptlonly nvidia ogg opengl openmp pam pcre pdf perl png ppds pppd python qt3 qt3support qt4 quicktime readline reflection samba sdl session spell spl sse sse2 ssl svg tcpd tiff truetype unicode vorbis win32codecs x86 xml xorg xv zlib" ALSA_CARDS="intel8x0" ALSA_PCM_PLUGINS="adpcm alaw asym copy dmix dshare dsnoop empty extplug file hooks iec958 ioplug ladspa lfloat linear meter mmap_emul mulaw multi null plug rate route share shm softvol" APACHE2_MODULES="actions alias auth_basic auth_digest authn_anon authn_dbd authn_dbm authn_default authn_file authz_dbm authz_default authz_groupfile authz_host authz_owner authz_user autoindex cache dav dav_fs dav_lock dbd deflate dir disk_cache env expires ext_filter file_cache filter headers ident imagemap include info log_config logio mem_cache mime mime_magic negotiation proxy proxy_ajp proxy_balancer proxy_connect proxy_http rewrite setenvif so speling status unique_id userdir usertrack vhost_alias" ELIBC="glibc" INPUT_DEVICES="keyboard mouse" KERNEL="linux" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" LINGUAS="en ko" USERLAND="GNU" VIDEO_CARDS="nvidia" Unset: CPPFLAGS, CTARGET, EMERGE_DEFAULT_OPTS, FFLAGS, INSTALL_MASK, LC_ALL, LDFLAGS, MAKEOPTS, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS
Are you sure -lc_p is needed in this case? I thought -pg was sufficient when linking with gcc, and -lc_p is only explicitly passed when linking via ld http://sourceware.org/binutils/docs/gprof/Compiling.html
# use static linking because glibc with profiling is libc_p.a gcc -pg nop.c -static ./a.out gprof -q -b Call graph granularity: each sample hit covers 2 byte(s) no time propagated index % time self children called name 0.00 0.00 1/1 __libc_start_main [817] [1] 0.0 0.00 0.00 1 main [1] ----------------------------------------------- Index by function name [1] main
wormo: from further in the gprof documentation: "If you run the linker ld directly ... In addition, you would probably want to specify the profiling C library, libc_p.a, by writing `-lc_p' instead of the usual `-lc'. This is not absolutely necessary, but doing this gives you number-of-calls information for standard library functions such as read and open. For example: " AFAIK, if you want to use c_p to profile libc, you have to use ld manually, Spanky might be able to comment better however.
(In reply to comment #2) > # use static linking because glibc with profiling is libc_p.a > gcc -pg nop.c -static > ./a.out > gprof -q -b Call graph > > > granularity: each sample hit covers 2 byte(s) no time propagated > > index % time self children called name > 0.00 0.00 1/1 __libc_start_main [817] > [1] 0.0 0.00 0.00 1 main [1] > ----------------------------------------------- > > Index by function name > > [1] main > If I tried on my machine, I got SIGSEGV instead of SIGFPE. Don't know why. (The configuration of my machine is already posted here) $ gcc -static nop.c -lc_p $ ./a.out Segmentation fault $ gdb -q a.out (no debugging symbols found) Using host libthread_db library "/lib/libthread_db.so.1". (gdb) r Starting program: /home/cinsk/Documents/pesticide/a.out (no debugging symbols found) Program received signal SIGSEGV, Segmentation fault. 0x0806e27b in __mcount_internal () (gdb) bt #0 0x0806e27b in __mcount_internal () #1 0x00000000 in ?? () (gdb)
*** This bug has been marked as a duplicate of bug 201376 ***
