From bddc54a37d6d04cc574f9edfc49f941e69dd5379 Mon Sep 17 00:00:00 2001
From: Samir Benmendil <me@rmz.io>
Date: Fri, 16 Oct 2020 12:21:46 +0100
Subject: CheckLanguage: Pass CMAKE_TOOLCHAIN_FILE to test project

Fixes: #20545
---
 Modules/CheckLanguage.cmake                                | 6 ++++++
 Tests/RunCMake/ToolchainFile/CheckLanguage-stdout.txt      | 1 +
 Tests/RunCMake/ToolchainFile/CheckLanguage-toolchain.cmake | 4 ++++
 Tests/RunCMake/ToolchainFile/CheckLanguage.cmake           | 2 ++
 Tests/RunCMake/ToolchainFile/RunCMakeTest.cmake            | 1 +
 5 files changed, 14 insertions(+)
 create mode 100644 Tests/RunCMake/ToolchainFile/CheckLanguage-stdout.txt
 create mode 100644 Tests/RunCMake/ToolchainFile/CheckLanguage-toolchain.cmake
 create mode 100644 Tests/RunCMake/ToolchainFile/CheckLanguage.cmake

diff --git a/Modules/CheckLanguage.cmake b/Modules/CheckLanguage.cmake
index 44387d4..928881c 100644
--- a/Modules/CheckLanguage.cmake
+++ b/Modules/CheckLanguage.cmake
@@ -68,6 +68,11 @@ file(WRITE \"\${CMAKE_CURRENT_BINARY_DIR}/result.cmake\"
     else()
       set(_D_CMAKE_MAKE_PROGRAM "-DCMAKE_MAKE_PROGRAM:FILEPATH=${CMAKE_MAKE_PROGRAM}")
     endif()
+    if(CMAKE_TOOLCHAIN_FILE)
+      set(_D_CMAKE_TOOLCHAIN_FILE "-DCMAKE_TOOLCHAIN_FILE:FILEPATH=${CMAKE_TOOLCHAIN_FILE}")
+    else()
+      set(_D_CMAKE_TOOLCHAIN_FILE "")
+    endif()
     execute_process(
       WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/CMakeFiles/Check${lang}
       COMMAND ${CMAKE_COMMAND} . -G ${CMAKE_GENERATOR}
@@ -75,6 +80,7 @@ file(WRITE \"\${CMAKE_CURRENT_BINARY_DIR}/result.cmake\"
                                  -T "${CMAKE_GENERATOR_TOOLSET}"
                                  ${_D_CMAKE_GENERATOR_INSTANCE}
                                  ${_D_CMAKE_MAKE_PROGRAM}
+                                 ${_D_CMAKE_TOOLCHAIN_FILE}
       OUTPUT_VARIABLE _cl_output
       ERROR_VARIABLE _cl_output
       RESULT_VARIABLE _cl_result
diff --git a/Tests/RunCMake/ToolchainFile/CheckLanguage-stdout.txt b/Tests/RunCMake/ToolchainFile/CheckLanguage-stdout.txt
new file mode 100644
index 0000000..b96eee6
--- /dev/null
+++ b/Tests/RunCMake/ToolchainFile/CheckLanguage-stdout.txt
@@ -0,0 +1 @@
+-- Looking for a C compiler - NOTFOUND
diff --git a/Tests/RunCMake/ToolchainFile/CheckLanguage-toolchain.cmake b/Tests/RunCMake/ToolchainFile/CheckLanguage-toolchain.cmake
new file mode 100644
index 0000000..081f905
--- /dev/null
+++ b/Tests/RunCMake/ToolchainFile/CheckLanguage-toolchain.cmake
@@ -0,0 +1,4 @@
+get_property(in_try_compile GLOBAL PROPERTY IN_TRY_COMPILE)
+if(in_try_compile)
+  message(FATAL_ERROR "Toolchain file included")
+endif()
diff --git a/Tests/RunCMake/ToolchainFile/CheckLanguage.cmake b/Tests/RunCMake/ToolchainFile/CheckLanguage.cmake
new file mode 100644
index 0000000..854b3d4
--- /dev/null
+++ b/Tests/RunCMake/ToolchainFile/CheckLanguage.cmake
@@ -0,0 +1,2 @@
+include(CheckLanguage)
+check_language(C)
diff --git a/Tests/RunCMake/ToolchainFile/RunCMakeTest.cmake b/Tests/RunCMake/ToolchainFile/RunCMakeTest.cmake
index 7eb4485..659523c 100644
--- a/Tests/RunCMake/ToolchainFile/RunCMakeTest.cmake
+++ b/Tests/RunCMake/ToolchainFile/RunCMakeTest.cmake
@@ -7,6 +7,7 @@ endfunction()
 
 run_cmake_toolchain(CallEnableLanguage)
 run_cmake_toolchain(CallProject)
+run_cmake_toolchain(CheckLanguage)
 run_cmake_toolchain(FlagsInit)
 run_cmake_toolchain(LinkFlagsInit)
 
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