I can print a string with printf("%s", str) but strlen(str) in the next
statement fails with Segment fault.
$ gcc -v
Using built-in specs.
Target: i486-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu 4.3.2-1ubuntu12'
--with-bugurl=file:///usr/share/doc/gcc-4.3/README.Bugs
--enable-languages=c,c++,fortran,objc,obj-c++ --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++/4.3
--program-suffix=-4.3 --enable-clocale=gnu --enable-libstdcxx-debug
--enable-objc-gc --enable-mpfr --enable-targets=all --enable-checking=release
--build=i486-linux-gnu --host=i486-linux-gnu --target=i486-linux-gnu
Thread model: posix
gcc version 4.3.2 (Ubuntu 4.3.2-1ubuntu12)
"gcc -g soundex.c -S" gives the following assembler for the 2 calls:
.loc 1 57 0
movl stderr, %edx
movl 8(%ebp), %eax
movl %eax, 8(%esp)
movl $.LC7, 4(%esp)
movl %edx, (%esp)
call fprintf
.loc 1 58 0
movl 8(%ebp), %eax
movl %eax, (%esp)
call strlen
addl 8(%ebp), %eax
movl %eax, 12(%ebp)
"gcc -O3 -fomit-frame-pointer soundex.c -S" gives:
movl stderr, %eax
movl %esi, 12(%esp)
movl $.LC0, 8(%esp)
movl $1, 4(%esp)
movl %eax, (%esp)
call __fprintf_chk
movl %esi, (%esp)
call strlen
leal (%esi,%eax), %edi
Strangely, this optimised code works fine.
--
Summary: strlen() crashes with sigsegv on ubuntu 8.10
Product: gcc
Version: 4.3.2
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: ajrobb at bigfoot dot com
GCC build triplet: i486-linux-gnu
GCC host triplet: i486-linux-gnu
GCC target triplet: i486-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39166
