Always use live host

[agocke]

Eliminates package dependency on the host during build and test.

[ghost]

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Issue Details

---

Eliminates package dependency on the host during build and test.

Author:	agocke
Assignees:	agocke
Labels:	area-Infrastructure-libraries
Milestone:	-

[am11]

--- a/eng/native/configuretools.cmake
+++ b/eng/native/configuretools.cmake
@@ -29,6 +29,7 @@ if(NOT WIN32 AND NOT CLR_CMAKE_TARGET_BROWSER)
     endif()
 
     find_program(EXEC_LOCATION_${exec}
+      NO_CACHE
       NAMES
       "${TOOLSET_PREFIX}${exec}${CLR_CMAKE_COMPILER_FILE_NAME_VERSION}"
       "${TOOLSET_PREFIX}${exec}")

fixes the build. "Building with older llvm" was fixed in #71742 but I forgot about this OOTB caching mechanism of cmake. :)

[agocke]

@am11 Thanks!

[am11]

Ah, NO_CACHE was added in cmake v3.21 https://gitlab.kitware.com/cmake/cmake/-/merge_requests/6181/diffs#d8d61bf8b07dd46cb8a5399600b4c9512a6eba7f (I was testing it in v3.24). But we do support older version and some mono CI legs are using older cmake (which is good to have coverage).

We would need the old way of evicting the cached result. 😁

--- a/eng/native/configuretools.cmake
+++ b/eng/native/configuretools.cmake
@@ -28,8 +28,8 @@ if(NOT WIN32 AND NOT CLR_CMAKE_TARGET_BROWSER)
       return()
     endif()
 
+    unset(EXEC_LOCATION_${exec} CACHE)
     find_program(EXEC_LOCATION_${exec}
-      NO_CACHE
       NAMES
       "${TOOLSET_PREFIX}${exec}${CLR_CMAKE_COMPILER_FILE_NAME_VERSION}"
       "${TOOLSET_PREFIX}${exec}")

tested with cmake 3.10.

@agocke, if this PR is targeting 7.0, could you please apply this patch here. Otherwise I can open a new PR for this. Thanks!

[agocke]

Happy to apply it here.

[am11]

linux-musl failure is because the host machine is Ubuntu and build is running directly on the host rather than inside Alpine container.