From 9af0e67ee506b81421169c1828a558a71941b13c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?M=C3=A1t=C3=A9=20Ferenc=20Nagy-Egri?= <mate@streamhpc.com>
Date: Fri, 10 Feb 2023 07:32:07 +0100
Subject: FetchContent: Relay CMAKE_GENERATOR_INSTANCE

If set, relay `CMAKE_GENERATOR_INSTANCE`.  It may affect compiler
detection in the subbuild folder.

Fixes: #24404
---
 Modules/FetchContent.cmake | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'Modules/FetchContent.cmake')

diff --git a/Modules/FetchContent.cmake b/Modules/FetchContent.cmake
index 8afb9bce72..a6250cc211 100644
--- a/Modules/FetchContent.cmake
+++ b/Modules/FetchContent.cmake
@@ -1536,7 +1536,9 @@ ExternalProject_Add_Step(${contentName}-populate copyfile
     if(CMAKE_GENERATOR_TOOLSET)
       list(APPEND subCMakeOpts "-T${CMAKE_GENERATOR_TOOLSET}")
     endif()
-
+    if(CMAKE_GENERATOR_INSTANCE)
+      list(APPEND subCMakeOpts "-DCMAKE_GENERATOR_INSTANCE:INTERNAL=${CMAKE_GENERATOR_INSTANCE}")
+    endif()
     if(CMAKE_MAKE_PROGRAM)
       list(APPEND subCMakeOpts "-DCMAKE_MAKE_PROGRAM:FILEPATH=${CMAKE_MAKE_PROGRAM}")
     endif()
-- 
cgit v1.2.1