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Fix -Wtautological-pointer-compare warnings

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Skip tautological pointer comparisons on pthread systems where we don't
use the weak symbols hack.
This commit is contained in:
Nick Wellnhofer 2017-11-27 14:20:31 +01:00
parent ff628d46a1
commit 2677fbf4a4
1 changed files with 26 additions and 11 deletions
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37
threads.c
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@ -47,10 +47,13 @@
#ifdef HAVE_PTHREAD_H
#if defined(__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__ >= 303) && \
defined(__GLIBC__) && defined(__linux__)
static int libxml_is_threaded = -1;
#if defined(__GNUC__) && defined(__GLIBC__)
#ifdef __linux__
#if (__GNUC__ == 3 && __GNUC_MINOR__ >= 3) || (__GNUC__ > 3)
#define XML_PTHREAD_WEAK
#pragma weak pthread_once
#pragma weak pthread_getspecific
#pragma weak pthread_setspecific
@ -68,9 +71,13 @@ static int libxml_is_threaded = -1;
#pragma weak pthread_key_create
#pragma weak pthread_key_delete
#pragma weak pthread_cond_signal
#endif
#endif /* __linux__ */
#endif /* defined(__GNUC__) && defined(__GLIBC__) */
#else /* __GNUC__, __GLIBC__, __linux__ */
static int libxml_is_threaded = 1;
#endif /* __GNUC__, __GLIBC__, __linux__ */
#endif /* HAVE_PTHREAD_H */
/*
@ -422,8 +429,11 @@ __xmlGlobalInitMutexLock(void)
/* Make sure the global init lock is initialized and then lock it. */
#ifdef HAVE_PTHREAD_H
/* The mutex is statically initialized, so we just lock it. */
if (pthread_mutex_lock != NULL)
pthread_mutex_lock(&global_init_lock);
#ifdef XML_PTHREAD_WEAK
if (pthread_mutex_lock == NULL)
return;
#endif /* XML_PTHREAD_WEAK */
pthread_mutex_lock(&global_init_lock);
#elif defined HAVE_WIN32_THREADS
LPCRITICAL_SECTION cs;
@ -492,8 +502,11 @@ void
__xmlGlobalInitMutexUnlock(void)
{
#ifdef HAVE_PTHREAD_H
if (pthread_mutex_unlock != NULL)
pthread_mutex_unlock(&global_init_lock);
#ifdef XML_PTHREAD_WEAK
if (pthread_mutex_unlock == NULL)
return;
#endif /* XML_PTHREAD_WEAK */
pthread_mutex_unlock(&global_init_lock);
#elif defined HAVE_WIN32_THREADS
if (global_init_lock != NULL) {
LeaveCriticalSection(global_init_lock);
@ -845,6 +858,7 @@ void
xmlInitThreads(void)
{
#ifdef HAVE_PTHREAD_H
#ifdef XML_PTHREAD_WEAK
if (libxml_is_threaded == -1) {
if ((pthread_once != NULL) &&
(pthread_getspecific != NULL) &&
@ -870,6 +884,7 @@ xmlInitThreads(void)
libxml_is_threaded = 0;
}
}
#endif /* XML_PTHREAD_WEAK */
#elif defined(HAVE_WIN32_THREADS) && !defined(HAVE_COMPILER_TLS) && (!defined(LIBXML_STATIC) || defined(LIBXML_STATIC_FOR_DLL))
InitializeCriticalSection(&cleanup_helpers_cs);
#endif
@ -896,7 +911,7 @@ xmlCleanupThreads(void)
xmlGenericError(xmlGenericErrorContext, "xmlCleanupThreads()\n");
#endif
#ifdef HAVE_PTHREAD_H
if ((libxml_is_threaded) && (pthread_key_delete != NULL))
if (libxml_is_threaded != 0)
pthread_key_delete(globalkey);
once_control = once_control_init;
#elif defined(HAVE_WIN32_THREADS) && !defined(HAVE_COMPILER_TLS) && (!defined(LIBXML_STATIC) || defined(LIBXML_STATIC_FOR_DLL))