From fbf594b62f4d1ee015a03a5df6e58fe796e63c98 Mon Sep 17 00:00:00 2001
From: Martin Kroeker <martin@ruby.chemie.uni-freiburg.de>
Date: Tue, 24 Dec 2024 13:34:33 +0100
Subject: [PATCH] Guard against empty CMAKE_Fortran_COMPILER_ID

---
 cmake/f_check.cmake | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/cmake/f_check.cmake b/cmake/f_check.cmake
index dc0f5e0ac5..3f713807ea 100644
--- a/cmake/f_check.cmake
+++ b/cmake/f_check.cmake
@@ -45,7 +45,7 @@ if (NOT ONLY_CBLAS)
 
   # TODO: detect whether underscore needed, set #defines and BU appropriately - use try_compile
   # TODO: set FEXTRALIB flags a la f_check?
-  if (NOT (${CMAKE_SYSTEM_NAME} MATCHES "Windows" AND ${CMAKE_Fortran_COMPILER_ID} MATCHES "IntelLLVM"))
+  if (NOT (${CMAKE_SYSTEM_NAME} MATCHES "Windows" AND x${CMAKE_Fortran_COMPILER_ID} MATCHES "IntelLLVM"))
   set(BU "_")
   file(APPEND ${TARGET_CONF_TEMP}
     "#define BUNDERSCORE _\n"