From 66adbf39abebeb890be8b5ea5a8685da20819696 Mon Sep 17 00:00:00 2001
From: Jerry James <loganjerry@gmail.com>
Date: Tue, 2 Dec 2025 21:16:43 -0700
Subject: [PATCH] Fix endianness issue in dtoa.cpp

Define IEEE_MC68k instead of IEEE_8087 on big endian architectures.
---
 src/CMakeLists.txt      | 4 ++++
 src/amplmp/src/dtoa.cpp | 4 ++++
 2 files changed, 8 insertions(+)

diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index c6ce72830c..a008ba4e0c 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -12,6 +12,10 @@ set(CMAKE_C_STANDARD 99)
 set(CMAKE_C_STANDARD_REQUIRED on)
 set(CMAKE_C_EXTENSIONS OFF)
 
+if(CMAKE_CXX_BYTE_ORDER STREQUAL "BIG_ENDIAN")
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DSCIP_BIG_ENDIAN")
+endif()
+
 if(NOT WIN32)
     set(SCIP_COMP_OPTIONS ${SCIP_COMP_OPTIONS} "$<$<COMPILE_LANGUAGE:C>:-D_XOPEN_SOURCE=600>")
 endif()
diff --git a/src/amplmp/src/dtoa.cpp b/src/amplmp/src/dtoa.cpp
index 3386cea500..6a08971b88 100644
--- a/src/amplmp/src/dtoa.cpp
+++ b/src/amplmp/src/dtoa.cpp
@@ -349,7 +349,11 @@ static double private_mem[PRIVATE_mem], *pmem_next = private_mem;
 extern "C" {
 #endif
 
+#ifdef SCIP_BIG_ENDIAN
+#define IEEE_MC68k
+#else
 #define IEEE_8087
+#endif
 #define IEEE_Arith
 #if defined(IEEE_8087) + defined(IEEE_MC68k) + defined(VAX) + defined(IBM) != 1
 Exactly one of IEEE_8087, IEEE_MC68k, VAX, or IBM should be defined.