https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66226
Bug ID: 66226
Summary: Incorrect code generation ppc, later assignment causes
calling argument corruption
Product: gcc
Version: 4.9.3
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: steven.deller at ois dot com
Target Milestone: ---
Created attachment 35581
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=35581&action=edit
Interim file
In the attached code, a simple assignment "rp = res" after the call to
getaddrinfo causes the arguments to getaddrinfo to be invalid, most likely the
hints argument, since making that argument NULL also allows the compiled code
to execute successfully.
An assignment following a call should not cause different behavior within the
call.
This only fails on the PowerPC compiler (I only have tested it on AIX). It
fails for versions 4.7.3, 4.8.3 and this reported 4.9.3 version.
The gcc compiler is the version supplied from AdaCore with the GNAT products.
I do not have access to the build information for the compiler.
Regards,
Steven Deller
410-757-6924
tga.c source:
#include <sys/socket.h>
#include <netdb.h>
#include <stdio.h>
int main(int argc, char **argv) {
struct addrinfo *res;
struct addrinfo hints;
int rc;
struct addrinfo *rp;
hints.ai_family = AF_INET; /* IPv4 only */
hints.ai_socktype = SOCK_DGRAM;
hints.ai_flags = 0;
hints.ai_protocol = 0;
hints.ai_canonname = NULL;
hints.ai_addr = NULL;
hints.ai_next = NULL;
rc = getaddrinfo("aix7", NULL, &hints, &res); // if hints is "NULL",
runs fine
rp = res; // rc=11 with this in. Comment out and rc=0.
printf ("rc=%d\n", rc);
return 0;
}
output from "gcc -v -save-temps tga.c" compilation:
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/toolchain/compilers/GNAT-7.3.1/ppc_6xx-aix_5.3/bin/../libexec/gcc/powerpc-ibm-aix7.1.0.0/4.9.3/lto-wrapper
Target: powerpc-ibm-aix7.1.0.0
Configured with: ../src/configure --enable-languages=ada,c --with-gnu-as
--with-gnu-ld --with-dwarf2 --disable-shared
--disable-build-poststage1-with-cxx --disable-libsanitizer --disable-libcilkrts
--with-bugurl=URL:mailto:rep...@adacore.com --disable-nls
--without-libiconv-prefix --disable-libmudflap --disable-libstdcxx-pch
--disable-libada --enable-checking=release --enable-multilib --disable-plugin
--with-mpfr=/sully.a/gnatmail/sandbox/gnat-7.3.1/ppc-aix-linux/mpfr/install
--with-gmp=/sully.a/gnatmail/sandbox/gnat-7.3.1/ppc-aix-linux/gmp/install
--with-mpc=/sully.a/gnatmail/sandbox/gnat-7.3.1/ppc-aix-linux/mpc/install
--with-build-time-tools=/sully.a/gnatmail/sandbox/gnat-7.3.1/ppc-aix/gcc/build/buildtools/bin
--prefix=/usr/local/gnat --target=powerpc-ibm-aix7.1.0.0
--host=powerpc-ibm-aix7.1.0.0 --build=i686-pc-linux-gnu
Thread model: aix
gcc version 4.9.3 20141101 for GNAT Pro 7.3.1 (20150118) (GCC)
COLLECT_GCC_OPTIONS='-v' '-save-temps'
/toolchain/compilers/GNAT-7.3.1/ppc_6xx-aix_5.3/bin/../libexec/gcc/powerpc-ibm-aix7.1.0.0/4.9.3/cc1
-E -quiet -v -iprefix
/toolchain/compilers/GNAT-7.3.1/ppc_6xx-aix_5.3/bin/../lib/gcc/powerpc-ibm-aix7.1.0.0/4.9.3/
tga.c -fpch-preprocess -o tga.i
ignoring nonexistent directory
"/toolchain/compilers/GNAT-7.3.1/ppc_6xx-aix_5.3/bin/../lib/gcc/powerpc-ibm-aix7.1.0.0/4.9.3/../../../../powerpc-ibm-aix7.1.0.0/include"
ignoring duplicate directory
"/toolchain/compilers/GNAT-7.3.1/ppc_6xx-aix_5.3/bin/../lib/gcc/../../lib/gcc/powerpc-ibm-aix7.1.0.0/4.9.3/include"
ignoring duplicate directory
"/toolchain/compilers/GNAT-7.3.1/ppc_6xx-aix_5.3/bin/../lib/gcc/../../lib/gcc/powerpc-ibm-aix7.1.0.0/4.9.3/include-fixed"
ignoring nonexistent directory
"/toolchain/compilers/GNAT-7.3.1/ppc_6xx-aix_5.3/bin/../lib/gcc/../../lib/gcc/powerpc-ibm-aix7.1.0.0/4.9.3/../../../../powerpc-ibm-aix7.1.0.0/include"
#include "..." search starts here:
#include <...> search starts here:
/toolchain/compilers/GNAT-7.3.1/ppc_6xx-aix_5.3/bin/../lib/gcc/powerpc-ibm-aix7.1.0.0/4.9.3/include
/toolchain/compilers/GNAT-7.3.1/ppc_6xx-aix_5.3/bin/../lib/gcc/powerpc-ibm-aix7.1.0.0/4.9.3/include-fixed
/usr/local/include
/toolchain/compilers/GNAT-7.3.1/ppc_6xx-aix_5.3/bin/../lib/gcc/../../include
/usr/include
End of search list.
COLLECT_GCC_OPTIONS='-v' '-save-temps'
/toolchain/compilers/GNAT-7.3.1/ppc_6xx-aix_5.3/bin/../libexec/gcc/powerpc-ibm-aix7.1.0.0/4.9.3/cc1
-fpreprocessed tga.i -quiet -dumpbase tga.c -auxbase tga -version -o tga.s
GNU C (GCC) version 4.9.3 20141101 for GNAT Pro 7.3.1 (20150118)
(powerpc-ibm-aix7.1.0.0)
compiled by GNU C version 4.9.3 20141101 for GNAT Pro 7.3.1 (20150118),
GMP version 5.1.3, MPFR version 3.1.2, MPC version 1.0.2
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=32768
GNU C (GCC) version 4.9.3 20141101 for GNAT Pro 7.3.1 (20150118)
(powerpc-ibm-aix7.1.0.0)
compiled by GNU C version 4.9.3 20141101 for GNAT Pro 7.3.1 (20150118),
GMP version 5.1.3, MPFR version 3.1.2, MPC version 1.0.2
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=32768
Compiler executable checksum: 1afb14c19ac4a4577644783d23418153
COLLECT_GCC_OPTIONS='-v' '-save-temps'
/toolchain/compilers/GNAT-7.3.1/ppc_6xx-aix_5.3/bin/../libexec/gcc/powerpc-ibm-aix7.1.0.0/4.9.3/as
-v -u -mpwr4 -many -o tga.o tga.s
GNU assembler version 2.24.51 (powerpc-ibm-aix7.1.0.0) using BFD version (GNU
Binutils) 2.24.51.20140908
COMPILER_PATH=/toolchain/compilers/GNAT-7.3.1/ppc_6xx-aix_5.3/bin/../libexec/gcc/powerpc-ibm-aix7.1.0.0/4.9.3/:/toolchain/compilers/GNAT-7.3.1/ppc_6xx-aix_5.3/bin/../libexec/gcc/
LIBRARY_PATH=/toolchain/compilers/GNAT-7.3.1/ppc_6xx-aix_5.3/bin/../lib/gcc/powerpc-ibm-aix7.1.0.0/4.9.3/:/toolchain/compilers/GNAT-7.3.1/ppc_6xx-aix_5.3/bin/../lib/gcc/:/toolchain/compilers/GNAT-7.3.1/ppc_6xx-aix_5.3/bin/../lib/gcc/powerpc-ibm-aix7.1.0.0/4.9.3/../../../:/lib/:/usr/lib/
COLLECT_GCC_OPTIONS='-v' '-save-temps'
/toolchain/compilers/GNAT-7.3.1/ppc_6xx-aix_5.3/bin/../libexec/gcc/powerpc-ibm-aix7.1.0.0/4.9.3/collect2
-bpT:0x10000000 -bpD:0x20000000 -btextro -bnodelcsect /lib/crt0.o
/toolchain/compilers/GNAT-7.3.1/ppc_6xx-aix_5.3/bin/../lib/gcc/powerpc-ibm-aix7.1.0.0/4.9.3/crtcxa.o
-L/toolchain/compilers/GNAT-7.3.1/ppc_6xx-aix_5.3/bin/../lib/gcc/powerpc-ibm-aix7.1.0.0/4.9.3
-L/toolchain/compilers/GNAT-7.3.1/ppc_6xx-aix_5.3/bin/../lib/gcc
-L/toolchain/compilers/GNAT-7.3.1/ppc_6xx-aix_5.3/bin/../lib/gcc/powerpc-ibm-aix7.1.0.0/4.9.3/../../..
tga.o
/toolchain/compilers/GNAT-7.3.1/ppc_6xx-aix_5.3/bin/../lib/gcc/powerpc-ibm-aix7.1.0.0/4.9.3/libgcc.a
-lc
/toolchain/compilers/GNAT-7.3.1/ppc_6xx-aix_5.3/bin/../lib/gcc/powerpc-ibm-aix7.1.0.0/4.9.3/libgcc.a
