util/checkplatformsyms.pl: update the Unix symbol filtering

Replace the grep|grep|awk|sed|sort|uniq abomination with a simple
and elegant awk script.

Signed-off-by: Eugene Syromiatnikov <esyr@openssl.org>
Reviewed-by: Neil Horman <nhorman@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.foundation>
MergeDate: Fri Apr  3 15:42:20 2026
(Merged from https://github.com/openssl/openssl/pull/30635)

diff --git a/util/checkplatformsyms.pl b/util/checkplatformsyms.pl
index f0ab62bdbac71f2b604642f100cfdf2f906e0ffa..0f44a4dbd90a94cfa5ae0270c56becd73faf217a 100755 (executable)
--- a/util/checkplatformsyms.pl
+++ b/util/checkplatformsyms.pl
@@ -73,9 +73,13 @@ if ($Config{osname} eq "MSWin32") {
         exit !$ok;
     }
 else {
-        $cmd = "objdump -t " . $objfilelist . " | grep UND | grep -v \@OPENSSL";
-        $cmd = $cmd . " | awk '{print \$NF}' |";
-        $cmd = $cmd . " sed -e\"s/@.*\$//\" | sort | uniq";
+        $cmd = "objdump -t " . $objfilelist . " | awk " .
+            "'/\\\\*UND\\\\*/ {" .
+                "split(\$NF, sym_lib, \"@\");" .
+                "if (sym_lib[2] !~ \"OPENSSL_[1-9][0-9]*\\\\.[0-9]+\\\\.[0-9]+\$\")" .
+                    "syms[sym_lib[1]] = 1;" .
+            "}" .
+            "END { for (s in syms) print s; };'";
 
         open $expsyms, '<', $expectedsyms or die;
         {