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* [Bug middle-end/17696] New: [cygwin] builtin alloca SIGSEGV with size too large
@ 2004-09-27 16:31 gcc at axel-naumann dot de
2004-09-27 16:52 ` [Bug middle-end/17696] " bangerth at dealii dot org
0 siblings, 1 reply; 2+ messages in thread
From: gcc at axel-naumann dot de @ 2004-09-27 16:31 UTC (permalink / raw)
To: gcc-bugs
Calling alloca with a large size triggers a SIGSEGV on cygwin. On linux, it does
not. I would expect it to do the same on cygwin, returning NULL if the size is
too large.
Sorry, no idea what component that belongs to - target, c, middle-end?
Axel.
--
// preproc code:
# 1 "alloca_iss.c"
# 1 "<built-in>"
# 1 "<command line>"
# 1 "alloca_iss.c"
int main() { return (alloca(4200000)!=0); }
--
Reading specs from /usr/lib/gcc-lib/i686-pc-cygwin/3.3.3/specs
Configured with: /gcc/gcc-3.3.3-3/configure --verbose --prefix=/usr --exec-prefi
x=/usr --sysconfdir=/etc --libdir=/usr/lib --libexecdir=/usr/lib --mandir=/usr/s
hare/man --infodir=/usr/share/info --enable-languages=c,ada,c++,d,f77,java,objc,
pascal --enable-nls --without-included-gettext --enable-libgcj --with-system-zli
b --enable-interpreter --enable-threads=posix --enable-java-gc=boehm --enable-sj
lj-exceptions --disable-version-specific-runtime-libs --disable-win32-registry
Thread model: posix
gcc version 3.3.3 (cygwin special)
--
CYGWIN_NT-5.1 ACEL 1.5.11(0.116/4/2) 2004-09-04 23:17 i686 unknown unknown Cygwin
--
command line triggering the issue: gcc alloca_iss.c
--
output of gcc -v -save-temps alloca_iss.c
Reading specs from /usr/lib/gcc-lib/i686-pc-cygwin/3.3.3/specs
Configured with: /gcc/gcc-3.3.3-3/configure --verbose --prefix=/usr
--exec-prefix=/usr --sysconfdir=/etc --libdir=/usr/lib --libexecdir=/usr/lib
--mandir=/usr/share/man --infodir=/usr/share/info
--enable-languages=c,ada,c++,d,f77,java,objc,pascal --enable-nls
--without-included-gettext --enable-libgcj --with-system-zlib
--enable-interpreter --enable-threads=posix --enable-java-gc=boehm
--enable-sjlj-exceptions --disable-version-specific-runtime-libs
--disable-win32-registry
Thread model: posix
gcc version 3.3.3 (cygwin special)
/usr/lib/gcc-lib/i686-pc-cygwin/3.3.3/cc1.exe -E -quiet -v -D__GNUC__=3
-D__GNUC_MINOR__=3 -D__GNUC_PATCHLEVEL__=3 -D__CYGWIN32__ -D__CYGWIN__ -Dunix
-D__unix__ -D__unix -idirafter
/usr/lib/gcc-lib/i686-pc-cygwin/3.3.3/../../../../include/w32api -idirafter
/usr/lib/gcc-lib/i686-pc-cygwin/3.3.3/../../../../i686-pc-cygwin/lib/../../include/w32api
alloca_iss.c alloca_iss.i
ignoring nonexistent directory "/usr/i686-pc-cygwin/include"
ignoring duplicate directory "/usr/i686-pc-cygwin/lib/../../include/w32api"
#include "..." search starts here:
#include <...> search starts here:
/usr/local/include
/usr/lib/gcc-lib/i686-pc-cygwin/3.3.3/include
/usr/include
/usr/include/w32api
End of search list.
/usr/lib/gcc-lib/i686-pc-cygwin/3.3.3/cc1.exe -fpreprocessed alloca_iss.i
-quiet -dumpbase alloca_iss.c -auxbase alloca_iss -version -o alloca_iss.s
GNU C version 3.3.3 (cygwin special) (i686-pc-cygwin)
compiled by GNU C version 3.3.3 (cygwin special).
GGC heuristics: --param ggc-min-expand=64 --param ggc-min-heapsize=65406
/usr/lib/gcc-lib/i686-pc-cygwin/3.3.3/../../../../i686-pc-cygwin/bin/as.exe
--traditional-format -o alloca_iss.o alloca_iss.s
/usr/lib/gcc-lib/i686-pc-cygwin/3.3.3/collect2.exe -Bdynamic
--dll-search-prefix=cyg /usr/lib/gcc-lib/i686-pc-cygwin/3.3.3/../../../crt0.o
/usr/lib/gcc-lib/i686-pc-cygwin/3.3.3/crtbegin.o
-L/usr/lib/gcc-lib/i686-pc-cygwin/3.3.3
-L/usr/lib/gcc-lib/i686-pc-cygwin/3.3.3/../../.. alloca_iss.o -lgcc -lcygwin
-luser32 -lkernel32 -ladvapi32 -lshell32 -lgcc
/usr/lib/gcc-lib/i686-pc-cygwin/3.3.3/crtend.o
--
Summary: [cygwin] builtin alloca SIGSEGV with size too large
Product: gcc
Version: 3.3.3
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: middle-end
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: gcc at axel-naumann dot de
CC: gcc-bugs at gcc dot gnu dot org
GCC build triplet: i686-pc-cygwin
GCC host triplet: i686-pc-cygwin
GCC target triplet: i686-pc-cygwin
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17696
^ permalink raw reply [flat|nested] 2+ messages in thread
* [Bug middle-end/17696] [cygwin] builtin alloca SIGSEGV with size too large
2004-09-27 16:31 [Bug middle-end/17696] New: [cygwin] builtin alloca SIGSEGV with size too large gcc at axel-naumann dot de
@ 2004-09-27 16:52 ` bangerth at dealii dot org
0 siblings, 0 replies; 2+ messages in thread
From: bangerth at dealii dot org @ 2004-09-27 16:52 UTC (permalink / raw)
To: gcc-bugs
[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #1: Type: text/plain, Size: 747 bytes --]
------- Additional Comments From bangerth at dealii dot org 2004-09-27 16:52 -------
The man page of alloca says:
RETURN VALUE
The alloca function returns a pointer to the beginning of
the allocated space. If the allocation causes stack over
flow, program behaviour is undefined.
I guess you have to live with the fact that allocating large chunks of
memory on the stack isn't such a great idea.
W.
--
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution| |INVALID
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17696
^ permalink raw reply [flat|nested] 2+ messages in thread
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2004-09-27 16:31 [Bug middle-end/17696] New: [cygwin] builtin alloca SIGSEGV with size too large gcc at axel-naumann dot de
2004-09-27 16:52 ` [Bug middle-end/17696] " bangerth at dealii dot org
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