Automerge / manual check of the fixes for NPTL configuration (bug#2173, bug#5871, and bug#9497).

Post-merge fix will follow.

configure.in

@@ -383,15 +383,16 @@ AC_MSG_CHECKING("if we should use 'skip-locking' as default for $target_os")
 if expr "$target_os" : "[[Ll]]inux.*" > /dev/null
 then
   MYSQLD_DEFAULT_SWITCHES="--skip-locking"
-  IS_LINUX="true"
-  AC_MSG_RESULT("yes");
+  TARGET_LINUX="true"
+  AC_MSG_RESULT("yes")
+  AC_DEFINE([TARGET_OS_LINUX], [1], [Whether we build for Linux])
 else
   MYSQLD_DEFAULT_SWITCHES=""
-  IS_LINUX="false"
-  AC_MSG_RESULT("no");
+  TARGET_LINUX="false"
+  AC_MSG_RESULT("no")
 fi
 AC_SUBST(MYSQLD_DEFAULT_SWITCHES)
-AC_SUBST(IS_LINUX)
+AC_SUBST(TARGET_LINUX)
 
 dnl Find paths to some shell programs
 AC_PATH_PROG(LN, ln, ln)
@@ -580,7 +581,7 @@ AC_SUBST(NOINST_LDFLAGS)
 # (this is true on the MySQL build machines to avoid NSS problems)
 #
 
-if test "$IS_LINUX" = "true" -a "$static_nss" = ""
+if test "$TARGET_LINUX" = "true" -a "$static_nss" = ""
 then
   tmp=`nm /usr/lib/libc.a  | grep _nss_files_getaliasent_r`
   if test -n "$tmp"
@@ -747,7 +748,7 @@ AC_CHECK_FUNC(sem_init, , AC_CHECK_LIB(posix4, sem_init))
 MYSQL_CHECK_ZLIB_WITH_COMPRESS
 
 # For large pages support
-if test "$IS_LINUX" = "true"
+if test "$TARGET_LINUX" = "true"
 then
   # For SHM_HUGETLB on Linux
   AC_CHECK_DECLS(SHM_HUGETLB, 
@@ -805,7 +806,7 @@ struct request_info *req;
 ])
 AC_SUBST(WRAPLIBS)
 
-if test "$IS_LINUX" = "true"; then
+if test "$TARGET_LINUX" = "true"; then
   AC_MSG_CHECKING([for atomic operations])
 
   atom_ops=
@@ -849,7 +850,7 @@ int main()
     [ USE_PSTACK=no ])
   pstack_libs=
   pstack_dirs=
-  if test "$USE_PSTACK" = yes -a "$IS_LINUX" = "true" -a "$BASE_MACHINE_TYPE" = "i386"
+  if test "$USE_PSTACK" = yes -a "$TARGET_LINUX" = "true" -a "$BASE_MACHINE_TYPE" = "i386"
   then
     have_libiberty= have_libbfd=
     my_save_LIBS="$LIBS"
@@ -1231,11 +1232,36 @@ esac
 # We have to check libc last because else it fails on Solaris 2.6
 
 with_posix_threads="no"
-# Hack for DEC-UNIX (OSF1)
+# Search thread lib on Linux
 if test "$with_named_thread" = "no"
 then
+    AC_MSG_CHECKING("Linux threads")
+    if test "$TARGET_LINUX" = "true"
+    then
+        AC_MSG_RESULT("starting")
+        # use getconf to check glibc contents
+        AC_MSG_CHECKING("getconf GNU_LIBPTHREAD_VERSION")
+        case `getconf GNU_LIBPTHREAD_VERSION | tr abcdefghijklmnopqrstuvwxyz ABCDEFGHIJKLMNOPQRSTUVWXYZ` in
+        NPTL* )
+                AC_MSG_RESULT("NPTL")
+                AC_DEFINE([HAVE_NPTL], [1], [NPTL threads implementation])
+                with_named_thread="-lpthread"
+                ;;
+        LINUXTHREADS* )
+                AC_MSG_RESULT("Linuxthreads")
+                AC_DEFINE([HAVE_LINUXTHREADS], [1], 
+                      [Whether we are using Xavier Leroy's LinuxThreads])
+                with_named_thread="-lpthread"
+                ;;
+        * )
+                AC_MSG_RESULT("unknown")
+                ;;
+        esac
+        if test "$with_named_thread" = "no"
+        then
+          # old method, check headers
           # Look for LinuxThreads.
-  AC_MSG_CHECKING("LinuxThreads")
+          AC_MSG_CHECKING("LinuxThreads in header file comment")
           res=`grep Linuxthreads /usr/include/pthread.h 2>/dev/null | wc -l`
           if test "$res" -gt 0
           then
@@ -1251,41 +1277,48 @@ then
           else
             AC_MSG_RESULT("Not found")
             # If this is a linux machine we should barf
-      if test "$IS_LINUX" = "true"
-      then
-	AC_MSG_ERROR([This is a linux system and Linuxthreads was not
-found. On linux Linuxthreads should be used.  Please install Linuxthreads
-(or a new glibc) and try again.  See the Installation chapter in the
-Reference Manual for more information.])
+            AC_MSG_ERROR([This is a Linux system without a working getconf, 
+and Linuxthreads was not found. Please install it (or a new glibc) and try again.  
+See the Installation chapter in the Reference Manual for more information.])
+          fi
         else
-	AC_MSG_CHECKING("DEC threads")
+            AC_MSG_RESULT("no need to check headers")
+        fi
+        
+        AC_MSG_CHECKING("for pthread_create in -lpthread");
+        ac_save_LIBS="$LIBS"
+        LIBS="$LIBS -lpthread"
+        AC_TRY_LINK( [#include <pthread.h>],
+              [ (void) pthread_create((pthread_t*) 0,(pthread_attr_t*) 0, 0, 0); ],
+              AC_MSG_RESULT("yes"),
+              [ AC_MSG_RESULT("no")
+                AC_MSG_ERROR([
+This is a Linux system claiming to support threads, either Linuxthreads or NPTL, but linking a test program failed.  
+Please install one of these (or a new glibc) and try again.  
+See the Installation chapter in the Reference Manual for more information.]) ]
+              )
+        LIBS="$ac_save_LIBS"
+    else
+        AC_MSG_RESULT("no")
+    fi  # "$TARGET_LINUX" 
+fi  # "$with_named_thread" = "no" -a "$with_mit_threads" = "no"
+
+
+# Hack for DEC-UNIX (OSF1 -> Tru64)
+if test "$with_named_thread" = "no" -a "$with_mit_threads" = "no"
+then
+    AC_MSG_CHECKING("DEC threads post OSF/1 3.2")
     if test -f /usr/shlib/libpthread.so -a -f /usr/lib/libmach.a -a -f /usr/ccs/lib/cmplrs/cc/libexc.a
     then
       with_named_thread="-lpthread -lmach -lexc"
       CFLAGS="$CFLAGS -D_REENTRANT"
       CXXFLAGS="$CXXFLAGS -D_REENTRANT"
-	  AC_DEFINE(HAVE_DEC_THREADS, [1],
-                    [Whether we are using DEC threads])
+      AC_DEFINE(HAVE_DEC_THREADS, [1], [Whether we are using DEC threads])
       AC_MSG_RESULT("yes")
     else
       AC_MSG_RESULT("no")
-	  AC_MSG_CHECKING("DEC 3.2 threads")
-          if test -f /usr/shlib/libpthreads.so -a -f /usr/lib/libmach.a -a -f /usr/ccs/lib/cmplrs/cc/libexc.a
-	  then
-	    with_named_thread="-lpthreads -lmach -lc_r"
-	    AC_DEFINE(HAVE_DEC_THREADS, [1])
-            AC_DEFINE([HAVE_DEC_3_2_THREADS], [1],
-                      [Whether we are using OSF1 DEC threads on 3.2])
-            with_osf32_threads="yes"
-            MYSQLD_DEFAULT_SWITCHES="--skip-thread-priority"
-	    AC_MSG_RESULT("yes")
-	  else
-	    AC_MSG_RESULT("no")
-          fi
-	fi
-     fi
-   fi
-fi
+    fi  # DEC threads
+fi  # "$with_named_thread" = "no" -a "$with_mit_threads" = "no"
 
 
 dnl This is needed because -lsocket has to come after the thread
@@ -1696,7 +1729,7 @@ fi
 AC_SUBST(COMPILATION_COMMENT)
 
 AC_MSG_CHECKING("need of special linking flags")
-if test "$IS_LINUX" = "true" -a "$ac_cv_prog_gcc" = "yes" -a "$all_is_static" != "yes"
+if test "$TARGET_LINUX" = "true" -a "$ac_cv_prog_gcc" = "yes" -a "$all_is_static" != "yes"
 then
   LDFLAGS="$LDFLAGS -rdynamic"
   AC_MSG_RESULT("-rdynamic")
@@ -1914,7 +1947,7 @@ CFLAGS="$ORG_CFLAGS"
 # Sanity check: We chould not have any fseeko symbol unless
 # large_file_support=yes
 AC_CHECK_FUNC(fseeko,
-[if test "$large_file_support" = no -a "$IS_LINUX" = "true";
+[if test "$large_file_support" = no -a "$TARGET_LINUX" = "true";
 then
   AC_MSG_ERROR("Found fseeko symbol but large_file_support is not enabled!");
 fi]

include/my_global.h

@@ -97,7 +97,7 @@
 
 
 /* Fix problem with S_ISLNK() on Linux */
-#if defined(HAVE_LINUXTHREADS)
+#if defined(TARGET_OS_LINUX)
 #undef  _GNU_SOURCE
 #define _GNU_SOURCE 1
 #endif
@@ -246,13 +246,13 @@ C_MODE_START int __cxa_pure_virtual() {\
 #endif
 
 /* In Linux-alpha we have atomic.h if we are using gcc */
-#if defined(HAVE_LINUXTHREADS) && defined(__GNUC__) && defined(__alpha__) && (__GNUC__ > 2 || ( __GNUC__ == 2 &&  __GNUC_MINOR__ >= 95)) && !defined(HAVE_ATOMIC_ADD)
+#if defined(TARGET_OS_LINUX) && defined(__GNUC__) && defined(__alpha__) && (__GNUC__ > 2 || ( __GNUC__ == 2 &&  __GNUC_MINOR__ >= 95)) && !defined(HAVE_ATOMIC_ADD)
 #define HAVE_ATOMIC_ADD
 #define HAVE_ATOMIC_SUB
 #endif
 
 /* In Linux-ia64 including atomic.h will give us an error */
-#if (defined(HAVE_LINUXTHREADS) && defined(__GNUC__) && (defined(__ia64__)||defined(__powerpc64__))) || !defined(THREAD)
+#if (defined(TARGET_OS_LINUX) && defined(__GNUC__) && (defined(__ia64__)||defined(__powerpc64__))) || !defined(THREAD)
 #undef HAVE_ATOMIC_ADD
 #undef HAVE_ATOMIC_SUB
 #endif
@@ -799,7 +799,7 @@ typedef unsigned long	uint32; /* Short for unsigned integer >= 32 bits */
 #error "Neither int or long is of 4 bytes width"
 #endif
 
-#if !defined(HAVE_ULONG) && !defined(HAVE_LINUXTHREADS) && !defined(__USE_MISC)
+#if !defined(HAVE_ULONG) && !defined(TARGET_OS_LINUX) && !defined(__USE_MISC)
 typedef unsigned long	ulong;		  /* Short for unsigned long */
 #endif
 #ifndef longlong_defined

myisam/Makefile.am

@@ -88,7 +88,7 @@ SUFFIXES = .sh
 	  -e 's!@''FIND_PROC''@!@FIND_PROC@!' \
 	  -e 's!@''MYSQLD_DEFAULT_SWITCHES''@!@MYSQLD_DEFAULT_SWITCHES@!' \
 	  -e 's!@''MYSQL_UNIX_ADDR''@!@MYSQL_UNIX_ADDR@!' \
-	  -e 's!@''IS_LINUX''@!@IS_LINUX@!' \
+	  -e 's!@''TARGET_LINUX''@!@TARGET_LINUX@!' \
 	  -e "s!@""CONF_COMMAND""@!@CONF_COMMAND@!" \
 	  -e 's!@''MYSQLD_USER''@!@MYSQLD_USER@!' \
 	  -e 's!@''sysconfdir''@!@sysconfdir@!' \

mysys/thr_mutex.c

@@ -17,7 +17,7 @@
 /* This makes a wrapper for mutex handling to make it easier to debug mutex */
 
 #include <my_global.h>
-#if defined(HAVE_LINUXTHREADS) && !defined (__USE_UNIX98)
+#if defined(TARGET_OS_LINUX) && !defined (__USE_UNIX98)
 #define __USE_UNIX98			/* To get rw locks under Linux */
 #endif
 #if defined(THREAD) && defined(SAFE_MUTEX)

scripts/Makefile.am

@@ -135,7 +135,7 @@ SUFFIXES = .sh
 	  -e 's!@''MYSQLD_DEFAULT_SWITCHES''@!@MYSQLD_DEFAULT_SWITCHES@!' \
 	  -e 's!@''MYSQL_UNIX_ADDR''@!@MYSQL_UNIX_ADDR@!' \
 	  -e 's!@''MYSQL_TCP_PORT''@!@MYSQL_TCP_PORT@!' \
-	  -e 's!@''IS_LINUX''@!@IS_LINUX@!' \
+	  -e 's!@''TARGET_LINUX''@!@TARGET_LINUX@!' \
 	  -e "s!@""CONF_COMMAND""@!@CONF_COMMAND@!" \
 	  -e 's!@''MYSQLD_USER''@!@MYSQLD_USER@!' \
 	  -e 's!@''STATIC_NSS_FLAGS''@!@STATIC_NSS_FLAGS@!' \

scripts/mysqld_safe.sh

@@ -368,7 +368,7 @@ do
     break
   fi
 
-  if @IS_LINUX@ && test $KILL_MYSQLD -eq 1
+  if @TARGET_LINUX@ && test $KILL_MYSQLD -eq 1
   then
     # Test if one process was hanging.
     # This is only a fix for Linux (running as base 3 mysqld processes)

sql/stacktrace.c

@@ -43,7 +43,7 @@ void safe_print_str(const char* name, const char* val, int max_len)
   fputc('\n', stderr);
 }
 
-#ifdef HAVE_LINUXTHREADS
+#ifdef TARGET_OS_LINUX
 #define SIGRETURN_FRAME_COUNT  2
 
 #if defined(__alpha__) && defined(__GNUC__)
@@ -201,7 +201,7 @@ end:
 stack trace is much more helpful in diagnosing the problem, so please do \n\
 resolve it\n");
 }
-#endif /* HAVE_LINUXTHREADS */
+#endif /* TARGET_OS_LINUX */
 #endif /* HAVE_STACKTRACE */
 
 /* Produce a core for the thread */

sql/stacktrace.h

@@ -18,7 +18,7 @@
 extern "C" {
 #endif
 
-#ifdef HAVE_LINUXTHREADS
+#ifdef TARGET_OS_LINUX
 #if defined(HAVE_STACKTRACE) || (defined (__i386__) || (defined(__alpha__) && defined(__GNUC__)))
 #undef HAVE_STACKTRACE
 #define HAVE_STACKTRACE
@@ -30,7 +30,7 @@ extern char* heap_start;
 void print_stacktrace(gptr stack_bottom, ulong thread_stack);
 void safe_print_str(const char* name, const char* val, int max_len);
 #endif /* (defined (__i386__) || (defined(__alpha__) && defined(__GNUC__))) */
-#endif /* HAVE_LINUXTHREADS */
+#endif /* TARGET_OS_LINUX */
 
 /* Define empty prototypes for functions that are not implemented */
 #ifndef HAVE_STACKTRACE

support-files/Makefile.am

@@ -90,7 +90,7 @@ SUFFIXES = .sh
 	  -e 's!@''FIND_PROC''@!@FIND_PROC@!' \
 	  -e 's!@''MYSQLD_DEFAULT_SWITCHES''@!@MYSQLD_DEFAULT_SWITCHES@!' \
 	  -e 's!@''MYSQL_UNIX_ADDR''@!@MYSQL_UNIX_ADDR@!' \
-	  -e 's!@''IS_LINUX''@!@IS_LINUX@!' \
+	  -e 's!@''TARGET_LINUX''@!@TARGET_LINUX@!' \
 	  -e "s!@""CONF_COMMAND""@!@CONF_COMMAND@!" \
 	  -e 's!@''MYSQLD_USER''@!@MYSQLD_USER@!' \
 	  -e 's!@''sysconfdir''@!@sysconfdir@!' \

tools/mysqlmanager.c

@@ -101,7 +101,7 @@ static CHARSET_INFO *cs= &my_charset_latin1;
   set by the user
 */
 
-#if defined(__i386__) && defined(HAVE_LINUXTHREADS)
+#if defined(__i386__) && defined(TARGET_OS_LINUX)
 #define DO_STACKTRACE 1
 #endif