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[Bug c++/44613] New: Declaring an array with non-constant length inside a switch corrupts stack pointer.
- From: "mark dot haines at openmarket dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 21 Jun 2010 15:42:44 -0000
- Subject: [Bug c++/44613] New: Declaring an array with non-constant length inside a switch corrupts stack pointer.
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
The following program compiles with g++ -O3 without errors or warnings but sets
crash at the first printf. It seems to zero the stack pointer before calling
printf.
----- Begin switch-crash.ii
# 1 "switch-crash.cpp"
# 1 "<built-in>"
# 1 "<command-line>"
# 1 "switch-crash.cpp"
extern "C" int printf (__const char *__restrict __format, ...);
int f(int len) {
switch(1) {
case 1:
char x[len];
break;
}
printf("Done\n");
}
int main() {
f(1);
printf("Done\n");
}
------ End switch-crash.ii
Output of g++ -v:
Using built-in specs.
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu 4.4.3-4ubuntu5'
--with-bugurl=file:///usr/share/doc/gcc-4.4/README.Bugs
--enable-languages=c,c++,fortran,objc,obj-c++ --prefix=/usr --enable-shared
--enable-multiarch --enable-linker-build-id --with-system-zlib
--libexecdir=/usr/lib --without-included-gettext --enable-threads=posix
--with-gxx-include-dir=/usr/include/c++/4.4 --program-suffix=-4.4 --enable-nls
--enable-clocale=gnu --enable-libstdcxx-debug --enable-plugin --enable-objc-gc
--disable-werror --with-arch-32=i486 --with-tune=generic
--enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu
--target=x86_64-linux-gnu
Thread model: posix
gcc version 4.4.3 (Ubuntu 4.4.3-4ubuntu5)
--
Summary: Declaring an array with non-constant length inside a
switch corrupts stack pointer.
Product: gcc
Version: 4.4.3
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: mark dot haines at openmarket dot com
GCC target triplet: x86_64-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44613