ftrace: objcopy version test for local symbols

[linux-2.6-omap-h63xx.git] / scripts / recordmcount.pl

diff --git a/scripts/recordmcount.pl b/scripts/recordmcount.pl
index 1891cf9743fcd3c44fc82cd522b50ece175bb8b0..ee9e12676776839c377a995713c3a0c71eed5985 100755 (executable)
--- a/scripts/recordmcount.pl
+++ b/scripts/recordmcount.pl
@@ -186,6 +186,36 @@ if ($filename =~ m,^(.*)(\.\S),) {
 my $mcount_s = $dirname . "/.tmp_mc_" . $prefix . ".s";
 my $mcount_o = $dirname . "/.tmp_mc_" . $prefix . ".o";
 
+#
+# --globalize-symbols came out in 2.17, we must test the version
+# of objcopy, and if it is less than 2.17, then we can not
+# record local functions.
+my $use_locals = 01;
+my $local_warn_once = 0;
+my $found_version = 0;
+
+open (IN, "$objcopy --version |") || die "error running $objcopy";
+while (<IN>) {
+    if (/objcopy.*\s(\d+)\.(\d+)/) {
+       my $major = $1;
+       my $minor = $2;
+
+       $found_version = 1;
+       if ($major < 2 ||
+           ($major == 2 && $minor < 17)) {
+           $use_locals = 0;
+       }
+       last;
+    }
+}
+close (IN);
+
+if (!$found_version) {
+    print STDERR "WARNING: could not find objcopy version.\n" .
+       "\tDisabling local function references.\n";
+}
+
+
 #
 # Step 1: find all the local (static functions) and weak symbols.
 #        't' is local, 'w/W' is weak (we never use a weak function)
@@ -229,6 +259,17 @@ sub update_funcs
 
     # is this function static? If so, note this fact.
     if (defined $locals{$ref_func}) {
+
+       # only use locals if objcopy supports globalize-symbols
+       if (!$use_locals) {
+           print STDERR
+               "$inputfile: WARNING: referencing local function " .
+               "$ref_func for mcount\n" .
+               "\tConsider upgrading objcopy to support the globalize-" .
+               "symbols option.\n"
+               if (!$local_warn_once++);
+           return;
+       }
        $convert{$ref_func} = 1;
     }