typedef unsigned char uint8_t;
typedef unsigned short uint16_t;
typedef unsigned int uint32_t;
typedef unsigned long long upad64_t;
typedef struct _pthread_mutex {
struct {
uint16_t __pthread_mutex_flag1;
uint8_t __pthread_mutex_flag2;
uint8_t __pthread_mutex_ceiling;
uint16_t __pthread_mutex_type;
uint16_t __pthread_mutex_magic;
} __pthread_mutex_flags;
union {
struct {
uint8_t __pthread_mutex_pad[8];
} __pthread_mutex_lock64;
struct {
uint32_t __pthread_ownerpid;
uint32_t __pthread_lockword;
} __pthread_mutex_lock32;
upad64_t __pthread_mutex_owner64;
} __pthread_mutex_lock;
upad64_t __pthread_mutex_data;
} pthread_mutex_t;
void foo(void)
{
pthread_mutex_t tmp = {{0, 0, 0, 0, 0x4d58}, {{{0}}}, 0};
}
On SPARC64 at -O0:
sth %g0, [%fp+2007]
stb %g0, [%fp+2009]
stb %g0, [%fp+2010]
sth %g0, [%fp+2011]
sethi %hi(19456), %g1
or %g1, 344, %g1
sth %g1, [%fp+2013]
stb %g0, [%fp+2015]
stx %g0, [%fp+2023]
On AMD64 at -O0:
movw $0, -32(%rbp)
movb $0, -30(%rbp)
movb $0, -29(%rbp)
movw $0, -28(%rbp)
movw $19800, -26(%rbp)
movb $0, -24(%rbp)
movq $0, -16(%rbp)
Note the 'b' on the last but one line in both cases: __pthread_mutex_pad is not
initialized according to the ISO C99 rules. This is critical on Solaris 64-bit
as it affects POSIX thread support.
The C++ and Objective-C compilers are also affected.
--
Summary: [4.0 Regression] Violation of C99 6.7.8 §21
Product: gcc
Version: 4.0.0
Status: UNCONFIRMED
Severity: critical
Priority: P2
Component: c
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: ebotcazou at gcc dot gnu dot org
CC: gcc-bugs at gcc dot gnu dot org
GCC build triplet: *-*-*
GCC host triplet: *-*-*
GCC target triplet: *-*-*
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19515
