Add Linux support to find_typedefs, with help from Alvaro.

src/tools/find_typedef

 #!/bin/sh
 
-# $PostgreSQL: pgsql/src/tools/find_typedef,v 1.8 2007/12/21 21:02:41 momjian Exp $
+# $PostgreSQL: pgsql/src/tools/find_typedef,v 1.9 2008/03/18 22:45:11 momjian Exp $
 
 # This script attempts to find all typedef's in the postgres binaries
 # by using 'nm' to report all typedef debugging symbols.
@@ -8,7 +8,7 @@
 # For this program to work, you must have compiled all binaries with 
 # debugging symbols.
 #
-# This is run on BSD/OS 4.0, so you may need to make changes.
+# This is run on BSD/OS 4.0 or Linux, so you may need to make changes.
 # 
 # Ignore the nm errors about a file not being a binary file.
 #
@@ -37,10 +37,18 @@ fi
 
 for DIR
 do
-	objdump --stabs "$DIR"/* |
-	awk ' $2 == "LSYM" && $7 ~ /:[tT]/ {sub(":.*", "", $7); print $7}' |
-	grep -v ' ' # some typedefs have spaces, remove them
+	if [ `objdump -W 2>&1 | wc -l` -eq 1 ]
+	then	# Linux
+		# unfortunately the Linux version doesn't show unreferenced typedefs
+		objdump -W "$DIR"/* |
+		egrep -A3 '(DW_TAG_typedef|DW_TAG_structure_type|DW_TAG_union_type)' |
+		awk ' $2 == "DW_AT_name" {print $NF}'
+	else	# BSD/OS
+		objdump --stabs "$DIR"/* |
+		awk ' $2 == "LSYM" && $7 ~ /:[tT]/ {sub(":.*", "", $7); print $7}'
+	fi
 done |
+grep -v ' ' | # some typedefs have spaces, remove them
 sort |
 uniq |
 # these are used both for typedefs and variable names