From 26bf72b86355c055c367021098e441ed80a68cd8 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Andr=C3=A9=20Schnabel?= <aschnabel@gams.com>
Date: Wed, 18 Sep 2024 14:11:27 +0000
Subject: [PATCH] Fix GCC complaining about -1 not being a valid char on arm64
 (Linux)

---
 src/gdlib/gmsstrm.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/gdlib/gmsstrm.cpp b/src/gdlib/gmsstrm.cpp
index 6e9b297..106afda 100644
--- a/src/gdlib/gmsstrm.cpp
+++ b/src/gdlib/gmsstrm.cpp
@@ -82,7 +82,7 @@ constexpr uint8_t signature_header = 0xFF;
 const std::string signature_gams = "*GAMS*"s;
 constexpr int verify_offset = 100;
 
-constexpr static char substChar {/*0x1A*/ std::char_traits<char>::eof()};
+constexpr static char substChar { std::numeric_limits<char>::is_signed ? std::char_traits<char>::eof() : 0x1A };
 
 union TDoubleVar
 {