Hi, I'm trying to profile a code that's I/O intensive and so I would like to use the profiling version of the C library, libc_p.a. In a nutshell, executables compiled with gcc with -p (or -pg) and linked with libc_p.a have a floating point exception right out the gate. (I also have the Intel C compiler installed, icc, and the same is true.) This is true for all versions of gcc I have installed, except for 2.95, for which the link fails. For example: ------------------------------------------------------------------------- %coot 108: cat hello.c #include <stdio.h> main() { printf ("hello, world!\n"); } %coot 109: gcc hello.c %coot 110: a.out hello, world! %coot 111: gcc hello.c -lc_p %coot 112: a.out hello, world! %coot 113: gcc -p hello.c -lc_p %coot 114: a.out Floating exception %coot 115: gcc -p hello.c %coot 116: a.out hello, world! %coot 117: gcc -pg hello.c %coot 118: a.out hello, world! %coot 119: gcc -p hello.c -lc_p %coot 120: a.out Floating exception %coot 121: gcc -pg hello.c -lc_p %coot 122: a.out Floating exception %coot 123: gcc-3.3 -pg hello.c -lc_p %coot 124: a.out Floating exception %coot 125: gcc-3.4 -pg hello.c -lc_p %coot 126: a.out Floating exception %coot 127: gcc-4.2 -pg hello.c -lc_p %coot 128: a.out Floating exception %coot 129: gcc-2.95 hello.c %coot 130: a.out hello, world! %coot 131: gcc-2.95 -pg hello.c %coot 132: a.out hello, world! %coot 133: gcc-2.95 -pg hello.c -lc_p /usr/bin/../lib/libc_p.a(syslog.op): In function `__vsyslog_chk': (.text+0x70e): undefined reference to `_Unwind_Resume' (blah-blah-blah) %coot 134: -------------------------------------------------------------------------- I'm using the version of libc_p.a found in the Synaptic Package manger (SPM) under libc6-prof. The versions of gcc were also found under the SPM. I found in the Synaptic Package manger (SPM) under libc6-prof. I've also installed gcc in the same way. Under the SPM, versions 2.95, 3.3., 3.4, 4.1, and 4.2 are available. The base version is 4.1: ----------------------------------------- %coot 104: gcc -v Using built-in specs. Target: i486-linux-gnu Configured with: ../src/configure -v --enable-languages=c,c++,fortran,objc,obj-c++,treelang --prefix=/usr --enable-shared --with-system-zlib --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --enable-nls --with-gxx-include-dir=/usr/include/c++/4.1.3 --program-suffix=-4.1 --enable-__cxa_atexit --enable-clocale=gnu --enable-libstdcxx-debug --enable-mpfr --enable-checking=release i486-linux-gnu Thread model: posix gcc version 4.1.3 20070929 (prerelease) (Ubuntu 4.1.2-16ubuntu2) %coot 105: ----------------------------------- I have a neighbor running Red Hat with gcc 3.2.3, and I am able to build and run there: ----------------------------------------------------------------------------------------------------------------------------------------------- [pember@tern _gprof]$ gcc -p hello.c -lc_p [pember@tern _gprof]$ ./a.out hello, world! [pember@tern _gprof]$ ----------------------------------------------------------------------------------------------------------------------------------------------- Is there some other version of libc_p I should be using? Thanks, Rick Pember