From 5129fff43c4fe08cb17d8789b8a5c778039a25c3 Mon Sep 17 00:00:00 2001
From: Jarkko Hietaniemi <jhi@iki.fi>
Date: Sun, 8 Jun 2003 16:45:50 +0000
Subject: [PATCH] More symbol scan logic from Alan Burlison.

p4raw-id: //depot/perl@19709
---
 Configure          | 22 +++++++++++++++-------
 Porting/Glossary   |  8 ++++++++
 hints/solaris_2.sh |  3 +++
 3 files changed, 26 insertions(+), 7 deletions(-)

diff --git a/Configure b/Configure
index 8e2a765..ed90386 100755
--- a/Configure
+++ b/Configure
@@ -1124,6 +1124,7 @@ uselargefiles=''
 uselongdouble=''
 usemorebits=''
 usemultiplicity=''
+mistrustnm=''
 nm_opt=''
 nm_so_opt=''
 runnm=''
@@ -7358,7 +7359,7 @@ csym='tlook=$1;
 case "$3" in
 -v) tf=libc.tmp; tc=""; tdc="";;
 -a) tf=libc.tmp; tc="[0]"; tdc="[]";;
-*) tlook="^$1\$"; tf=libc.list; tc="()"; tdc="()";;
+*) tlook="^$1\$"; tf=libc.list; tc=""; tdc="()";;
 esac;
 tx=yes;
 case "$reuseval-$4" in
@@ -7368,14 +7369,20 @@ esac;
 case "$tx" in
 yes)
 	tval=false;
-	if $test "$runnm" = "true" && $contains $tlook $tf >/dev/null 2>&1; then
-		tval=true;
-	else
-		echo "int main() { extern short $1$tdc; printf(\"%hd\", $1$tc); }" > t.c;
-		if $cc -o t $optimize $ccflags $ldflags t.c $libs >/dev/null 2>&1; then
+	if $test "$runnm" = true; then
+		if $contains $tlook $tf >/dev/null 2>&1; then
 			tval=true;
+		elif $test "$mistrustnm" = compile -o "$mistrustnm" = run; then
+			echo "int main() { extern void *$1$tdc; return(&$1$tc ? 0 : 1); }" > try.c;
+			$cc -o try $optimize $ccflags $ldflags try.c >/dev/null 2>&1 $libs && tval=true;
+			$test "$mistrustnm" = run -a -x try && { $run ./try >/dev/null 2>&1 || tval=false; };
+			$rm -f try try.c core;
 		fi;
-		$rm -f t t.c;
+	else
+		echo "#include <stdio.h>" > try.c;
+		echo "int main() { extern void *$1$tdc; return(&$1$tc ? 0 : 1); }" > try.c;
+		$cc -o try $optimize $ccflags $ldflags try.c $libs >/dev/null 2>&1 && tval=true;
+		$rm -f try try.c;
 	fi;
 	;;
 *)
@@ -21154,6 +21161,7 @@ man3dir='$man3dir'
 man3direxp='$man3direxp'
 man3ext='$man3ext'
 mips_type='$mips_type'
+mistrustnm='$mistrustnm'
 mkdir='$mkdir'
 mmaptype='$mmaptype'
 modetype='$modetype'
diff --git a/Porting/Glossary b/Porting/Glossary
index b5b24a9..771820a 100644
--- a/Porting/Glossary
+++ b/Porting/Glossary
@@ -3508,6 +3508,14 @@ mips_type (usrinc.U):
 	This variable holds the environment type for the mips system.
 	Possible values are "BSD 4.3" and "System V".
 
+mistrustnm (usenm.U):
+	This variable can be used to establish a fallthrough for the cases
+	where nm fails to find a symbol.  If usenm is false or usenm is true
+	and mistrustnm is false, this variable has no effect.  If usenm is true
+	and mistrustnm is "compile", a test program will be compiled to try to
+	find any symbol that can't be located via nm lookup.  If mistrustnm is
+	"run", the test program will be run as well as being compiled.
+
 mkdir (Loc.U):
 	This variable is used internally by Configure to determine the
 	full pathname (if any) of the mkdir program.  After Configure runs,
diff --git a/hints/solaris_2.sh b/hints/solaris_2.sh
index 75e55f7..bc49dae 100644
--- a/hints/solaris_2.sh
+++ b/hints/solaris_2.sh
@@ -23,6 +23,9 @@
 # Solaris has secure SUID scripts
 d_suidsafe=${d_suidsafe:-define}
 
+# Be paranoid about nm failing to find symbols
+mistrustnm=run
+
 # Several people reported problems with perl's malloc, especially
 # when use64bitall is defined or when using gcc.
 #     http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/2001-01/msg01318.html
-- 
2.7.4