target/8788: GCC fails to report an error for invalid input

target/8788: GCC fails to report an error for invalid input

[killer.lightspeed]

>Number:         8788
>Category:       target
>Synopsis:       GCC fails to report an error for invalid input
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    unassigned
>State:          open
>Class:          ice-on-illegal-code
>Submitter-Id:   net
>Arrival-Date:   Mon Dec 02 09:26:01 PST 2002
>Closed-Date:
>Last-Modified:
>Originator:     Ben Peddell
>Release:        gcc version 3.2.1
>Organization:
>Environment:
OS: Windows 98 [Version 4.10.2222]
CPU: AuthenticAMD AMD-K6(tm) 3D processor
RAM: 160.0MB RAM
Distribution: MS-DOS DJGPP v2
>Description:
GCC encounters an internal compiler error instead of reporting an error when it encounters an attempt to fit a 192-bit structure into a 32-bit register.

E:\DJGPP\bugs>gcc -v -save-temps -c test2.c
Reading specs from e:/djgpp/lib/gcc-lib/djgpp/3.21/specs
Configured with: /devel/gnu/gcc/3.2/gnu/gcc-3.21/configure i586-pc-msdosdjgpp --prefix=/dev/env/DJDIR --disable-nls
Thread model: single
gcc version 3.2.1
 e:/djgpp/lib/gcc-lib/djgpp/3.21/cpp0.exe -lang-c -v -D__GNUC__=3 -D__GNUC_MINOR__=2 -D__GNUC_PATCHLEVEL__=1 -D__GXX_ABI_VERSION=102 -D__MSDOS__ -D__GO32__ -D__DJGPP__=2 -D__unix__ -D__MSDOS__ -D__GO32__ -D__DJGPP__=2 -D__unix__ -Asystem=msdos -Asystem=unix -D__NO_INLINE__ -D__STDC_HOSTED__=1 -Acpu=i386 -Amachine=i386 -Di386 -D__i386 -D__i386__ -D__tune_i586__ -D__tune_pentium__ -DMSDOS -DGO32 -DDJGPP=2 -Dunix -remap -imacros e:/djgpp/lib/gcc-lib/djgpp/3.21/djgpp.ver test2.c test2.i
GNU CPP version 3.2.1 (cpplib) (80386, BSD syntax)
ignoring nonexistent directory "e:/djgpp/djgpp/include"
#include "..." search starts here:
#include <...> search starts here:
 e:/djgpp/lib/gcc-lib/djgpp/3.21/include
 e:/djgpp/include
End of search list.
 e:/djgpp/lib/gcc-lib/djgpp/3.21/cc1.exe -fpreprocessed test2.i -quiet -dumpbase test2.c -version -o test2.s
GNU CPP version 3.2.1 (cpplib) (80386, BSD syntax)
GNU C version 3.2.1 (djgpp)
	compiled by GNU C version 3.2.1.
test2.c: In function `switch_to_stack':
test2.c:10: Internal compiler error in emit_move_insn, at expr.c:2771
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://www.gnu.org/software/gcc/bugs.html> for instructions.
>How-To-Repeat:
Invoked with:
gcc -v -save-temps -c test2.c
Preprocessed source (test2.i):
# 1 "test2.c"
# 1 "<built-in>"
# 1 "<command line>"
# 1 "e:/djgpp/lib/gcc-lib/djgpp/3.21/djgpp.ver" 1
# 1 "e:/djgpp/include/sys/version.h" 1 3
# 2 "e:/djgpp/lib/gcc-lib/djgpp/3.21/djgpp.ver" 2
# 2 "<command line>" 2
# 1 "test2.c"
typedef struct {
    long x[6];
} myjmp_buf;

typedef struct {
    myjmp_buf regs;
} my_stack;

void switch_to_stack (my_stack *stack){
    asm (
        "\n"
        : "+a" (stack->regs)
    );
}
>Fix:

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