gcc{48,49,5,6,7,8}: In the case of a "system GCC", detect if the system

libgcc is newer than the one about to be installed. If so, don't install
the libgcc.

Having an older libgcc appear in the lookup may result in binaries not
running, as they need symbols from the newer libgcc.
Such a case is PR pkg/54506.

Leaves SunOS unchanged, by request from jperkin.

1 files changed, 81 insertions, 0 deletions

diff --git a/mk/scripts/larger_symbol_version.awk b/mk/scripts/larger_symbol_version.awk
new file mode 100755
index 00000000000..a8d99c2579b
--- /dev/null
+++ b/mk/scripts/larger_symbol_version.awk
@@ -0,0 +1,81 @@
+#!/usr/bin/awk -f
+
+# $NetBSD: larger_symbol_version.awk,v 1.1 2019/09/08 14:47:53 maya Exp $
+
+# Copyright (c) 2019 Maya Rashish <maya@NetBSD.org>.
+# All rights reserved.
+#
+# This code is derived from software contributed to The NetBSD Foundation
+# by Maya Rashish.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in
+#    the documentation and/or other materials provided with the
+#    distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+# FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
+# COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
+# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+# OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+# SUCH DAMAGE.
+
+# For each absolute symbol in an ELF binary, extract the component
+# of the symbol name that looks like a version.
+#
+# If the supplied version is larger, return 1
+# 
+# example:
+#     echo "/usr/lib/libgcc_s.so 3.4" | awk -f larger_symbol_version.awk
+
+BEGIN {
+	nm = ENVIRON["NM"]
+	if (nm == "")
+		nm = "nm"
+}
+
+
+function largest_symbol_version(ELF) {
+	cmd = nm " -D " ELF " 2>/dev/null"
+	while ((cmd | getline) > 0) {
+		# Absolute symbol of the form ALPHABET_3.4
+		if (($2 == "A") && ($3 ~ /[A-Za-z_]*[0-9]*\.[0-9]*/)) {
+			split($3, matches, ".")
+
+			sub(/[A-Za-z_]*/,"",matches[1])
+
+			current_major = int(matches[1])
+			current_minor = int(matches[2])
+
+			if ((current_major > target_major) ||
+			   ((current_major == target_major) &&
+			    (current_minor > target_minor))) {
+				print "the version of " ELF " is newer than target version " target_major "." target_minor
+				exit 0
+			}
+		}
+	}
+	print "the version of " ELF " is older or equal to target version " target_major "." target_minor
+	exit 0
+}
+
+{ 
+
+	split($NF, target_version, ".")
+	target_major = target_version[1]
+	target_minor = target_version[2]
+
+	largest_symbol_version($1);
+}