From 84a33e8892ca58b00374797aba99404e20210952 Mon Sep 17 00:00:00 2001
From: Antti Kantee <pooka@iki.fi>
Date: Mon, 8 Feb 2016 12:40:57 +0000
Subject: [PATCH] build-rr: check cc/ld versions

Issue a warning or error for old or prehistoric tools,
respectively.

XXX: not sure how the ld check will work with GNU gold.
We'll see.

Issue reported by a number of users recently, including
in issue #69.
---
 build-rr.sh | 40 +++++++++++++++++++++++++++++++++++++++-
 1 file changed, 39 insertions(+), 1 deletion(-)

diff --git a/build-rr.sh b/build-rr.sh
index 62a3b8a..24d4e8a 100755
--- a/build-rr.sh
+++ b/build-rr.sh
@@ -299,13 +299,51 @@ setvars ()
 	abspath RUMPSRC
 }
 
-buildrump ()
+checktools ()
 {
 
 	# Check that a clang build is not attempted.
 	[ -z "${BUILDRUMP_HAVE_LLVM}" ] \
 	    || die rumprun does not yet support clang ${CC:+(\$CC: $CC)}
 
+	delay=5
+
+	# check that gcc is modern enough
+	vers=$(${CC:-cc} -E -dM - < /dev/null | awk '
+	    /__GNUC__/ {version += 100*$3}
+	    /__GNUC_MINOR__/ {version += $3}
+	    END { print version; if (version) exit 0; exit 1; }')
+	if [ ${vers} -lt 406 ]; then
+		die gcc is too old, need 4.6 or later. ${CC:+(\$CC: $CC)}
+	elif [ ${vers} -lt 408 ]; then
+		echo '>>'
+		echo ">> WARNING: gcc is old. ${CC:+(\$CC: $CC)}"
+		echo '>> Version 4.8 or later is recommended.'
+		echo ">> (continuing in ${delay} seconds)"
+		echo '>>'
+		sleep ${delay}
+	fi
+
+	# check that ld is modern enough
+	vers=$(${CC:-cc} -Wl,--version 2>&1 | awk '
+	    /GNU ld.*Binutils/{version += 100*$NF}
+	    END { print version; if (version) exit 0; exit 1; }')
+	if [ ${vers} -lt 223 ]; then
+		die ld is too old, need 2.23 or later.
+	elif [ ${vers} -lt 225 ]; then
+		echo '>>'
+		echo ">> WARNING: ld is old."
+		echo '>> Version 2.25 or later is recommended.'
+		echo ">> (continuing in ${delay} seconds)"
+		echo '>>'
+		sleep ${delay}
+	fi
+}
+
+buildrump ()
+{
+
+	checktools
 	checkprevbuilds
 
 	extracflags=
-- 
2.39.5