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.

diff --git a/build-rr.sh b/build-rr.sh
index 62a3b8ab6d27d4f2ac03c82231f6e379d05d6f1a..24d4e8a9ad7da3fd30d9b9ae72723a51045fb97f 100755 (executable)
--- 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=