Initial stab at IRIX configuration support for threading. Manually

applied parts of following patches:
	Subject: Perl 5.004_54 on IRIX
	Date: Wed, 19 Nov 1997 18:37:14 +0200 (EET)
	From: Jarkko Hietaniemi <jhi@iki.fi>
	Subject: Re: Perl 5.004_54 on IRIX
	Date: 19 Nov 1997 17:10:17 -0800
	From: Scott Henry <scotth@sgi.com>

p4raw-id: //depot/perl@271

5 files changed, 80 insertions, 2 deletions

diff --git a/README.threads b/README.threads
index 69bddca5a8..653321af8a 100644
--- a/README.threads
+++ b/README.threads
@@ -4,6 +4,7 @@ If you want to build with multi-threading support and you are
 running Linux 2.x (with the LinuxThreads library installed:
 that's the linuxthreads and linuxthreads-devel RPMs for RedHat)
 or Digital UNIX 4.x or Solaris 2.x for recentish x (2.5 is OK)
+or IRIX 6.2 or newer (6.2 will require a few os patches),
 then you should be able to use
     ./Configure -Dusethreads -Doptimize=-g -ders
     make
@@ -42,6 +43,19 @@ For Digital Unix 4.x:
     Zap mallocobj and mallocsrc (foo='')
     Change d_mymalloc to undef
 For Solaris, do the same as for Linux above.
+For IRIX:
+    Add -DUSE_THREADS -DDEBUGGING to ccflags
+    Add -DUSE_THREADS -DDEBUGGING to cppflags
+    Add -lpthread to libs
+    Change optimize to -g
+    For IRIX 6.2, you have to have the following patches installed:
+	1404 Irix 6.2 Posix 1003.1b man pages
+	1645 IRIX 6.2 & 6.3 POSIX header file updates
+	2000 Irix 6.2 Posix 1003.1b support modules
+	2254 Pthread library fixes
+    For IRIX 6.3 and 6.4 the pthreads should work out of the box.
+    Thanks to Hannu Napari <Hannu.Napari@hut.fi> for the IRIX
+    pthreads patches information.
 
 Now you can do a
     make
diff --git a/hints/irix_6.sh b/hints/irix_6.sh
index 795b6ab640..1ae1ca5249 100644
--- a/hints/irix_6.sh
+++ b/hints/irix_6.sh
@@ -20,6 +20,9 @@
 # Tweaked by Chip Salzenberg <chip@perl.com> on 5/13/97
 #    - don't assume 'cc -n32' if the n32 libm.so is missing
 
+# Threaded by Jarkko Hietaniemi <jhi@iki.fi> on 11/18/97
+#    - POSIX threads knowledge by IRIX version
+
 # Use   sh Configure -Dcc='cc -n32' to try compiling with -n32.
 #     or -Dcc='cc -n32 -mips3' (or -mips4) to force (non)portability
 # Don't bother with -n32 unless you have the 7.1 or later compilers.
@@ -112,3 +115,49 @@ libswanted="$*"
 set `echo X "$libswanted "|sed -e 's/ sun / /' -e 's/ crypt / /' -e 's/ bsd / /' -e 's/ PW / /'`
 shift
 libswanted="$*"
+
+if [ "X$usethreads" != "X" ]; then
+    if test ! -f /usr/include/pthread.h -o ! -f /usr/lib/libpthread.so; then
+	uname_r=`uname -r`
+	case "`uname -r`" in
+	6.0|6.1)
+	    echo >&4 "IRIX $uname_r does not have the POSIX threads."
+	    echo >&4 "You should upgrade to at least IRIX 6.3."
+	    echo >&4 "Cannot continue, aborting."
+	    exit 1
+	    ;;
+	6.2)
+	    echo >&4 ""
+cat >&4 <<EOF
+IRIX 6.2 $uname_r can have the POSIX threads.
+The following IRIX patches must, however, be installed:
+
+        1404 Irix 6.2 Posix 1003.1b man pages
+        1645 IRIX 6.2 & 6.3 POSIX header file updates
+        2000 Irix 6.2 Posix 1003.1b support modules
+        2254 Pthread library fixes
+
+Cannot continue, aborting.
+EOF
+	    exit 1
+	    ;;
+	6.*|7.*)
+	    echo >&4 "IRIX $uname_r should have the POSIX threads."
+	    echo >&4 "But somehow you do not seem to have them installed."
+	    echo >&4 "Cannot continue, aborting."
+	    exit 1
+	    ;;
+	esac
+	unset uname-r
+    fi
+    ccflags="-DUSE_THREADS $ccflags"
+    cppflags="-DUSE_THREADS $cppflags"
+    # -lpthread needs to come before -lc but after other libraries such
+    # as -lgdbm and such like. We assume here that -lc is present in
+    # libswanted. If that fails to be true in future, then this can be
+    # changed to add pthread to the very end of libswanted.
+    set `echo X "$libswanted "| sed -e 's/ c / pthread /'`
+    ld="cc"
+    shift
+    libswanted="$*"
+fi
diff --git a/hints/irix_6_0.sh b/hints/irix_6_0.sh
index 38fe27d282..e76890d120 100644
--- a/hints/irix_6_0.sh
+++ b/hints/irix_6_0.sh
@@ -41,3 +41,11 @@ libswanted="$*"
 # set `echo X "$libswanted "|sed -e 's/ socket / /' -e 's/ sun / /' -e 's/ crypt / /' -e 's/ nsl / /' -e 's/ dl / /'`
 # shift
 # libswanted="$*"
+
+if [ "X$usethreads" != "X" ]; then
+    echo >&4 "IRIX 6.0 does not have POSIX threads."
+    echo >&4 "You should upgrade to at least IRIX 6.3."
+    echo >&4 "Cannot continue, aborting."
+    exit 1
+fi
+
diff --git a/hints/irix_6_1.sh b/hints/irix_6_1.sh
index 38fe27d282..91c3ef8cf8 100644
--- a/hints/irix_6_1.sh
+++ b/hints/irix_6_1.sh
@@ -41,3 +41,10 @@ libswanted="$*"
 # set `echo X "$libswanted "|sed -e 's/ socket / /' -e 's/ sun / /' -e 's/ crypt / /' -e 's/ nsl / /' -e 's/ dl / /'`
 # shift
 # libswanted="$*"
+
+if [ "X$usethreads" != "X" ]; then
+    echo >&4 "IRIX 6.1 does not have POSIX threads."
+    echo >&4 "You should upgrade to at least IRIX 6.3."
+    echo >&4 "Cannot continue, aborting."
+    exit 1
+fi
diff --git a/perl.h b/perl.h
index 431ac96bfe..9facb910bf 100644
--- a/perl.h
+++ b/perl.h
@@ -113,7 +113,7 @@ register struct op *op asm(stringify(OP_IN_REGISTER));
 # define STANDARD_C 1
 #endif
 
-#if defined(__cplusplus) || defined(WIN32)
+#if defined(__cplusplus) || defined(WIN32) || defined(__sgi)
 # define DONT_DECLARE_STD 1
 #endif
 
@@ -1375,7 +1375,7 @@ EXT struct thread *	thr;		/* Currently executing (fake) thread */
 
 /* VMS doesn't use environ array and NeXT has problems with crt0.o globals */
 #if !defined(VMS) && !(defined(NeXT) && defined(__DYNAMIC__))
-#if !defined(DONT_DECLARE_STD) || (defined(__svr4__) && defined(__GNUC__) && defined(sun))
+#if !defined(DONT_DECLARE_STD) || (defined(__svr4__) && defined(__GNUC__) && defined(sun)) || defined(__sgi)
 extern char **	environ;	/* environment variables supplied via exec */
 #endif
 #else