[XS] Change in coreboot[main]: util/lint: Use bigint for hexadecimal values in handle_range

[Subrata Banik (Code Review)]

Subrata Banik has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/84575?usp=email )

Change subject: util/lint: Use bigint for hexadecimal values in handle_range
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util/lint: Use bigint for hexadecimal values in handle_range

The `handle_range` function in `kconfig_lint` was failing to correctly
handle large hexadecimal values ( 64-bit value) due to limitations with
Perl's handling of standard integers.

This commit modifies the function to use the `bigint` pragma, enabling
it to handle arbitrarily large integers. This prevents issues with
64-bit hexadecimal values and ensures accurate comparisons for range
validation.

Change-Id: I402bb9bec9ba5bfb79b4185f35228c41d4a7b674
Signed-off-by: Subrata Banik 
---
M util/lint/kconfig_lint
1 file changed, 5 insertions(+), 3 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/75/84575/1

diff --git a/util/lint/kconfig_lint b/util/lint/kconfig_lint
index 43b1630..b051dd9 100755
--- a/util/lint/kconfig_lint
+++ b/util/lint/kconfig_lint
@@ -856,12 +856,14 @@
     my $expression;
     ( $range2, $expression ) = handle_if_line( $range2, $inside_config, $filename, $line_no );

+    # Use bigint for large hexadecimal values
+    use bigint;
     $range1 =~ /^\s*(?:0x)?([A-Fa-f0-9]+)\s*$/;
-    my $checkrange1 = $1;
+    my $checkrange1 = Math::BigInt->new($1);
     $range2 =~ /^\s*(?:0x)?([A-Fa-f0-9]+)\s*$/;
-    my $checkrange2 = $1;
+    my $checkrange2 = Math::BigInt->new($1);

-    if ( $checkrange1 && $checkrange2 && ( hex($checkrange1) > hex($checkrange2) ) ) {
+    if ( $checkrange1 && $checkrange2 && ( $checkrange1 > $checkrange2 ) ) {
         show_error("Range entry in $filename line $line_no value 1 ($range1) is greater than value 2 ($range2).");
     }