c++/10433: G++ crash using array pointer and sizeof as arguments to same function in template method

c++/10433: G++ crash using array pointer and sizeof as arguments to same function in template method

[jrumsey]

>Number:         10433
>Category:       c++
>Synopsis:       G++ crash using array pointer and sizeof as arguments to same function in template method
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          ice-on-legal-code
>Submitter-Id:   net
>Arrival-Date:   Fri Apr 18 17:46:01 UTC 2003
>Closed-Date:
>Last-Modified:
>Originator:     jrumsey@blizzard.com
>Release:        gcc version 3.4 20030417 (experimental)
>Organization:
>Environment:
Mandrake 7.2 Linux, Kernel=2.4.18-6mdkenterprise #1 SMP
>Description:
This simple test case causes a segmentation fault in the compiler on the call to strfn().  Replacing the "query" argument with &query[0] causes it to work, as does replacing the "sizeof(query)" with a constant value, E.G. "1024".  The same code in a non-template method also compiles correctly.

Command line and compiler output:

$ g++ -v -save-temps templatetest2.cpp -o templatetest2
Reading specs from /usr/unstable/lib/gcc-lib/i686-pc-linux-gnu/3.4/specs
Configured with: ../gcc/configure --prefix=/usr/unstable
Thread model: posix
gcc version 3.4 20030417 (experimental)
 /usr/unstable/lib/gcc-lib/i686-pc-linux-gnu/3.4/cc1plus -E -quiet -v -D_GNU_SOURCE templatetest2.cpp templatetest2.ii
ignoring nonexistent directory "/usr/unstable/i686-pc-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/unstable/include/c++/3.4
 /usr/unstable/include/c++/3.4/i686-pc-linux-gnu
 /usr/unstable/include/c++/3.4/backward
 /usr/local/include
 /usr/unstable/include
 /usr/unstable/lib/gcc-lib/i686-pc-linux-gnu/3.4/include
 /usr/include
End of search list.
 /usr/unstable/lib/gcc-lib/i686-pc-linux-gnu/3.4/cc1plus -fpreprocessed templatetest2.ii -quiet -dumpbase templatetest2.cpp -auxbase templatetest2 -version -o templatetest2.s
GNU C++ version 3.4 20030417 (experimental) (i686-pc-linux-gnu)
        compiled by GNU C version 3.4 20030417 (experimental).
GGC heuristics: --param ggc-min-expand=98 --param ggc-min-heapsize=128638
templatetest2.cpp: In member function `void TClass<REC>::Load(const char*)':
templatetest2.cpp:12: internal compiler error: Segmentation fault
>How-To-Repeat:
Compile this preprocessed source

# 1 "templatetest2.cpp"
# 1 "<built-in>"
# 1 "<command line>"
# 1 "templatetest2.cpp"


extern char *strfn(char *dest, const char *src, int destsize);

class Record {
};

template <class REC> class TClass {
public:
        void Load(const char *filter) {
                char query[1024];
                strfn(query, "SQL QUERY", sizeof(query));
        }
};

int main(int argc, char **argv)
{
        TClass<Record> db;
        return 0;
}
>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted: