From 1a0a390be48a415b08103672f3b2d3d76865d23c Mon Sep 17 00:00:00 2001
From: "H. Vetinari" <h.vetinari@gmx.com>
Date: Fri, 8 Nov 2024 14:35:19 +1100
Subject: [PATCH 3/5] add DLL import/export machinery for RowMajorStrg

Suggested-By: Isuru Fernando <isuruf@gmail.com>
---
 CBLAS/include/cblas.h     |  9 +++++++++
 CBLAS/src/CMakeLists.txt  |  3 +++
 CBLAS/src/cblas_globals.c | 10 ++++++++--
 3 files changed, 20 insertions(+), 2 deletions(-)

diff --git a/CBLAS/include/cblas.h b/CBLAS/include/cblas.h
index f7d411571..4ac2d7793 100644
--- a/CBLAS/include/cblas.h
+++ b/CBLAS/include/cblas.h
@@ -4,6 +4,15 @@
 #include <stdint.h>
 #include <inttypes.h>
 
+#ifdef _MSC_VER
+#  ifdef CBLAS_BUILDING_DLL
+#    define CBLAS_DLL __declspec(dllexport)
+#  else
+#    define CBLAS_DLL __declspec(dllimport)
+#  endif
+#else
+#  define CBLAS_DLL
+#endif
 
 #ifdef __cplusplus
 extern "C" {            /* Assume C declarations for C++ */
diff --git a/CBLAS/src/CMakeLists.txt b/CBLAS/src/CMakeLists.txt
index a8152297a..e75d1e51d 100644
--- a/CBLAS/src/CMakeLists.txt
+++ b/CBLAS/src/CMakeLists.txt
@@ -124,6 +124,9 @@ set_target_properties(
   VERSION ${LAPACK_VERSION}
   SOVERSION ${LAPACK_MAJOR_VERSION}
   )
+if(BUILD_SHARED_LIBS)
+  target_compile_definitions(cblas PRIVATE CBLAS_BUILDING_DLL)
+endif()
 if(HAS_ATTRIBUTE_WEAK_SUPPORT)
   target_compile_definitions(${CBLASLIB} PRIVATE HAS_ATTRIBUTE_WEAK_SUPPORT)
 endif()
diff --git a/CBLAS/src/cblas_globals.c b/CBLAS/src/cblas_globals.c
index 5d91a18c9..b7bf74e23 100644
--- a/CBLAS/src/cblas_globals.c
+++ b/CBLAS/src/cblas_globals.c
@@ -1,2 +1,8 @@
-   int CBLAS_CallFromC=0;
-   int RowMajorStrg=0;
+#ifdef _MSC_VER
+#  define CBLAS_DLL __declspec(dllexport)
+#else
+#  define CBLAS_DLL
+#endif
+
+CBLAS_DLL int CBLAS_CallFromC=0;
+CBLAS_DLL int RowMajorStrg=0;