[InterOp] Fix a build failure when configuring offline #20011
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With llvm's include(Googletest), CppInterOp might download its own googletest, ignoring the system installation. This created several problems: - An existing system installation might be ignored. - When used in ROOT with builtin gtest, a conflicting gtest might be downloaded. - When ROOT is configured with fail-on-missing while offline, the configuration fails, because it is assumed that gtest needs to be downloaded. This is not the case, though, if gtest is present in the system. Therefore: - Test if the targets GTest::gtest or gtest exist. If found, no further actions are required. - New: If not found, run find_package(GTest). If found, continue as normal. - New: If not found, warn and disable the interop tests.
It was assumed that CppInterOp needs internet connection to download gtest. This should not be the case, any more, since it can use the system googletest or ROOT builtin targets. Therefore: - Remove the internet connnectivity check. It fails builds on Gentoo, because packages are always built without connection. - Change CPPINTEROP_ENABLE_TESTING from CACHE FORCE to CACHE. This enables users to override values when configuring. If they don't set any value, the value follows "testing=On/Off".
Test Results 22 files 22 suites 3d 21h 24m 40s ⏱️ Results for commit 72b979a. |
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With llvm's include(Googletest), CppInterOp might download its own
googletest, ignoring the system installation. This created several
problems:
downloaded.
configuration fails, because it is assumed that gtest needs to be
downloaded. This is not the case, though, if gtest is present in the
system.
Therefore:
actions are required.
With the above, the logic in ROOT can be simplified:
CPPINTEROP_ENABLE_TESTINGbased on whethertestingis on or off.