From e4105c76a843423e4aa50a91db71d39d6881e5aa Mon Sep 17 00:00:00 2001
From: Martin Schlemmer <azarah@gentoo.org>
Date: Mon, 5 Dec 2005 08:13:19 +0000
Subject: Also add weak symbols.

Signed-off-by: Martin Schlemmer <azarah@gentoo.org>
---
 localdecls.h                       |  2 ++
 scripts/gen_symbol_header.awk      | 57 ++++++++++++++++++++++++++++++++++++--
 scripts/gen_symbol_version_map.awk | 49 +++++++++++++++++++++++++++++---
 3 files changed, 101 insertions(+), 7 deletions(-)

diff --git a/localdecls.h b/localdecls.h
index ab6b8d7..938c20e 100644
--- a/localdecls.h
+++ b/localdecls.h
@@ -55,6 +55,8 @@
 /* Taken from glibc */
 # define strong_alias(_name, _aliasname) \
 	extern __typeof (_name) _aliasname __attribute__ ((alias (#_name)));
+# define weak_alias(_name, _aliasname) \
+	extern __typeof (_name) _aliasname __attribute__ ((weak, alias (#_name)));
 
 
 #endif
diff --git a/scripts/gen_symbol_header.awk b/scripts/gen_symbol_header.awk
index f87d891..6c14c92 100644
--- a/scripts/gen_symbol_header.awk
+++ b/scripts/gen_symbol_header.awk
@@ -9,7 +9,7 @@ BEGIN {
 		nextfile;
 
 	for (x in SYMBOLS) {
-		sym_regex = "^" SYMBOLS[x] "(@|$)"
+		sym_regex = "^" SYMBOLS[x] "(@|$)";
 		if ($8 ~ sym_regex) {
 			split($8, symbol_array, /@|@@/);
 
@@ -23,8 +23,8 @@ BEGIN {
 
 			ADD = 1;
 			# Check that we do not add duplicates
-			for (x in PROCESSED_SYMBOLS) {
-				if (x == $8) {
+			for (y in PROCESSED_SYMBOLS) {
+				if (y == $8) {
 					ADD = 0;
 					break;
 				}
@@ -35,6 +35,33 @@ BEGIN {
 				PROCESSED_SYMBOLS[$8] = $8;
 			}
 		}
+
+		sym_regex = "^__" SYMBOLS[x] "(@|$)";
+		if (($5 == "WEAK") && ($8 ~ sym_regex)) {
+			split($8, symbol_array, /@|@@/);
+			
+			# Don't add local symbols of versioned libc's
+			if (VERSIONED_LIBC && !symbol_array[2])
+				continue;
+
+			# We have a versioned libc
+			if (symbol_array[2] && !VERSIONED_LIBC)
+			    	VERSIONED_LIBC = 1;
+
+			ADD = 1;
+			# Check that we do not add duplicates
+			for (y in PROCESSED_SYMBOLS) {
+				if (y == $8) {
+					ADD = 0;
+					break;
+				}
+			}
+			
+			if (ADD) {
+				WEAK_SYMBOLS[SYMBOLS[x]] = WEAK_SYMBOLS[SYMBOLS[x]] " " $8;
+				PROCESSED_SYMBOLS[$8] = $8;
+			}
+		}
 	}
 }
 
@@ -86,6 +113,30 @@ END {
 				printf("strong_alias(%s, %s);\n", sym_real_name,
 				       sym_index);
 			}
+
+			if (WEAK_SYMBOLS[sym_index]) {
+				split(WEAK_SYMBOLS[sym_index], sym_weak_full);
+				
+				for (y in sym_weak_full) {
+					split(sym_weak_full[y], sym_weak_array, /@|@@/);
+
+					# Make sure for unversioned libc's that the
+					# variable is valid ...
+					if (!symbol_array[2])
+						symbol_array[2] = "";
+					if (!sym_weak_array[2])
+						sym_weak_array[2] = "";
+		
+					# Add weak symbols for libc's like glibc that
+					# have them
+					if ((sym_weak_array[1] == "__" sym_index) &&
+					    (sym_weak_array[2] == symbol_array[2])) {
+						    printf("weak_alias(%s, %s);\n",
+							   sym_real_name,
+							   "__" sym_index);
+					}
+				}
+			}
 			
 			printf("\n");
 		}
diff --git a/scripts/gen_symbol_version_map.awk b/scripts/gen_symbol_version_map.awk
index d13efaf..c236d67 100644
--- a/scripts/gen_symbol_version_map.awk
+++ b/scripts/gen_symbol_version_map.awk
@@ -9,7 +9,7 @@ BEGIN {
 		nextfile;
 
 	for (x in SYMBOLS) {
-		sym_regex = "^" SYMBOLS[x] "(@|$)"
+		sym_regex = "^" SYMBOLS[x] "(@|$)";
 		if ($8 ~ sym_regex) {
 			split($8, symbol_array, /@|@@/);
 
@@ -27,8 +27,8 @@ BEGIN {
 
 			ADD = 1;
 			# Check that we do not add duplicates
-			for (x in PROCESSED_SYMBOLS) {
-				if (x == $8) {
+			for (y in PROCESSED_SYMBOLS) {
+				if (y == $8) {
 					ADD = 0;
 					break;
 				}
@@ -39,6 +39,37 @@ BEGIN {
 				PROCESSED_SYMBOLS[$8] = $8;
 			}
 		}
+
+		sym_regex = "^__" SYMBOLS[x] "(@|$)";
+		if (($5 == "WEAK") && ($8 ~ sym_regex)) {
+			split($8, symbol_array, /@|@@/);
+			
+			# Don't add local symbols of versioned libc's
+			if (VERSIONED_LIBC && !symbol_array[2])
+				continue;
+
+			# Handle non-versioned libc's like uClibc ...
+			if (!symbol_array[2])
+				symbol_array[2] = "";
+			
+			# We have a versioned libc
+			if (symbol_array[2] && !VERSIONED_LIBC)
+				VERSIONED_LIBC = 1;
+
+			ADD = 1;
+			# Check that we do not add duplicates
+			for (y in PROCESSED_SYMBOLS) {
+				if (y == $8) {
+					ADD = 0;
+					break;
+				}
+			}
+			
+			if (ADD) {
+				WEAK_SYMBOLS[symbol_array[2]] = WEAK_SYMBOLS[symbol_array[2]] " " symbol_array[1];
+				PROCESSED_SYMBOLS[$8] = $8;
+			}
+		}
 	}
 }
 
@@ -71,8 +102,18 @@ END {
 		
 		split(SYMBOL_LIST[sym_version], sym_names);
 		
-		for (x in sym_names)
+		for (x in sym_names) {
 			printf("    %s;\n", sym_names[x]);
+
+			split(WEAK_SYMBOLS[sym_version], sym_weak_names);
+
+			for (y in sym_weak_names) {
+				# Add weak symbols for libc's like glibc that
+				# have them
+				if (sym_weak_names[y] == "__" sym_names[x])
+					printf("    %s;\n", sym_weak_names[y]);
+			}
+		}
 		
 		if (!old_sym_version) {
 			printf("  local:\n");
-- 
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