Bug#715468: gcc-4.7: internal compiler error with -O2

[Cay Blomqvist <cay.blomqvist@gmail.com>]

Package: gcc-4.7
Version: 4.7.2-5
Severity: normal
Tags: upstream

Dear Maintainer,

Compiling the attached program with

gcc -std=c99 test.c -o test -Wall -Wextra -O2

results in

test.c: In function ‘pow2_s’:
test.c:3:7: internal compiler error: in build2_stat, at tree.c:3785

but works fine without the -O2 flag.



-- System Information:
Debian Release: 7.1
  APT prefers testing
  APT policy: (500, 'testing'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 3.2.0-4-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages gcc-4.7 depends on:
ii  binutils      2.22-8
ii  cpp-4.7       4.7.2-5
ii  gcc-4.7-base  4.7.2-5
ii  libc6         2.13-38
ii  libgcc1       1:4.7.2-5
ii  libgmp10      2:5.0.5+dfsg-2
ii  libgomp1      4.7.2-5
ii  libitm1       4.7.2-5
ii  libmpc2       0.9-4
ii  libmpfr4      3.1.0-5
ii  libquadmath0  4.7.2-5
ii  zlib1g        1:1.2.7.dfsg-13

Versions of packages gcc-4.7 recommends:
ii  libc6-dev  2.13-38

Versions of packages gcc-4.7 suggests:
pn  binutils-gold        <none>
pn  gcc-4.7-doc          <none>
pn  gcc-4.7-locales      <none>
pn  gcc-4.7-multilib     <none>
pn  libcloog-ppl0        <none>
pn  libgcc1-dbg          <none>
pn  libgomp1-dbg         <none>
pn  libitm1-dbg          <none>
pn  libmudflap0-4.7-dev  <none>
pn  libmudflap0-dbg      <none>
pn  libppl-c2            <none>
pn  libppl7              <none>
pn  libquadmath0-dbg     <none>




*** /tmp/ccsJ7oOo.out
// /usr/lib/gcc/x86_64-linux-gnu/4.7/cc1 -quiet -imultiarch x86_64-linux-gnu
test.c -quiet -dumpbase test.c -mtune=generic -march=x86-64 -auxbase test -O2
-Wall -Wextra -std=c99 -o - -frandom-seed=0
# 1 "test.c"
# 1 "<command-line>"
# 1 "test.c"
# 1 "/usr/lib/gcc/x86_64-linux-gnu/4.7/include/stdint.h" 1 3 4


# 1 "/usr/include/stdint.h" 1 3 4
# 26 "/usr/include/stdint.h" 3 4
# 1 "/usr/include/features.h" 1 3 4
# 323 "/usr/include/features.h" 3 4
# 1 "/usr/include/x86_64-linux-gnu/bits/predefs.h" 1 3 4
# 324 "/usr/include/features.h" 2 3 4
# 356 "/usr/include/features.h" 3 4
# 1 "/usr/include/x86_64-linux-gnu/sys/cdefs.h" 1 3 4
# 359 "/usr/include/x86_64-linux-gnu/sys/cdefs.h" 3 4
# 1 "/usr/include/x86_64-linux-gnu/bits/wordsize.h" 1 3 4
# 360 "/usr/include/x86_64-linux-gnu/sys/cdefs.h" 2 3 4
# 357 "/usr/include/features.h" 2 3 4
# 388 "/usr/include/features.h" 3 4
# 1 "/usr/include/x86_64-linux-gnu/gnu/stubs.h" 1 3 4



# 1 "/usr/include/x86_64-linux-gnu/bits/wordsize.h" 1 3 4
# 5 "/usr/include/x86_64-linux-gnu/gnu/stubs.h" 2 3 4




# 1 "/usr/include/x86_64-linux-gnu/gnu/stubs-64.h" 1 3 4
# 10 "/usr/include/x86_64-linux-gnu/gnu/stubs.h" 2 3 4
# 389 "/usr/include/features.h" 2 3 4
# 27 "/usr/include/stdint.h" 2 3 4
# 1 "/usr/include/x86_64-linux-gnu/bits/wchar.h" 1 3 4
# 28 "/usr/include/stdint.h" 2 3 4
# 1 "/usr/include/x86_64-linux-gnu/bits/wordsize.h" 1 3 4
# 29 "/usr/include/stdint.h" 2 3 4
# 37 "/usr/include/stdint.h" 3 4
typedef signed char int8_t;
typedef short int int16_t;
typedef int int32_t;

typedef long int int64_t;







typedef unsigned char uint8_t;
typedef unsigned short int uint16_t;

typedef unsigned int uint32_t;



typedef unsigned long int uint64_t;
# 66 "/usr/include/stdint.h" 3 4
typedef signed char int_least8_t;
typedef short int int_least16_t;
typedef int int_least32_t;

typedef long int int_least64_t;






typedef unsigned char uint_least8_t;
typedef unsigned short int uint_least16_t;
typedef unsigned int uint_least32_t;

typedef unsigned long int uint_least64_t;
# 91 "/usr/include/stdint.h" 3 4
typedef signed char int_fast8_t;

typedef long int int_fast16_t;
typedef long int int_fast32_t;
typedef long int int_fast64_t;
# 104 "/usr/include/stdint.h" 3 4
typedef unsigned char uint_fast8_t;

typedef unsigned long int uint_fast16_t;
typedef unsigned long int uint_fast32_t;
typedef unsigned long int uint_fast64_t;
# 120 "/usr/include/stdint.h" 3 4
typedef long int intptr_t;


typedef unsigned long int uintptr_t;
# 135 "/usr/include/stdint.h" 3 4
typedef long int intmax_t;
typedef unsigned long int uintmax_t;
# 4 "/usr/lib/gcc/x86_64-linux-gnu/4.7/include/stdint.h" 2 3 4
# 2 "test.c" 2

void *pow2_s(void *arg)
{
    intptr_t n = (intptr_t)arg;

    if (n == 0)
        return (void *)1;

    n--;

    intptr_t s1 = (intptr_t)pow2_s((void *)n);
    intptr_t s2 = (intptr_t)pow2_s((void *)n);

    return (void *)(s1 + s2);
}

int main(void)
{
    intptr_t n = 5;

    pow2_s((void *)n);

    return 0;
}