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bootstrap/4768: gencodes core dumps under 64-bit HP-UX because of alloca prototype
- To: gcc-gnats at gcc dot gnu dot org
- Subject: bootstrap/4768: gencodes core dumps under 64-bit HP-UX because of alloca prototype
- From: dmeranda at iac dot net
- Date: 2 Nov 2001 07:51:36 -0000
- Reply-To: dmeranda at iac dot net
>Synopsis: gencodes core dumps under 64-bit HP-UX because of alloca prototype
>Arrival-Date: Thu Nov 01 23:56:00 PST 2001
>Originator: Deron Meranda
>Release: gcc 3.0.2
HP-UX 11.0, HP C/ANSI C compiler B.11.01.06, HP 9000 model L2000-44 (64-bit PA-RISC), all HP-UX standard patches up to the August 2001 patch bundle are installed, GNU binutils 2.11.2, GNU make 3.79.1.
Attempting to build gcc for platform "hppa2.0w-hp-hpux11.00". This is NOT a cross compiler.
Fails in first pass of bootstrap when running "gencodes", with a SEGV core dump in the file rtl.c at line 1130, immediately after the first call to alloca(). alloca() is being provided by the included libiberty/alloca.c file, not by the operating system or HP compiler.
Using HP C compiler "/usr/bin/cc -Ae +DA2.0W +DD64". The extra flags force it into standard 64-bit mode, since this environment supports both 32-bit and 64-bit development.
I determined that this problem is due to the prototype for the alloca() function not being present. Since this is a 64-bit environment, alloca() is returning an 8-byte pointer. But without a function prototype, the compiler is coercing the return type into an int, which is only 4-bytes. This corrupts the pointer.
CC="/usr/bin/cc -Ae +DA2.0W +DD64" \
configure --enable-threads=posix --with-gnu-as hppa2.0w-hp-hpux11.00
Insure that there is a prototype for alloca(), such as:
void * alloca (size_t);
The most obvious place is in the "gcc/system.h" header, but this may not be the best way to fix it.