Ninja: Fail early on when ninja build tool does not run

Diagnose failure to run `ninja --version` and abort early.  Otherwise we
end up aborting with a confusing message about ninja version "" being
too old.

Closes: #16378

4 files changed, 13 insertions, 0 deletions

diff --git a/Tests/RunCMake/Ninja/NinjaToolMissing-result.txt b/Tests/RunCMake/Ninja/NinjaToolMissing-result.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/Tests/RunCMake/Ninja/NinjaToolMissing-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/Ninja/NinjaToolMissing-stderr.txt b/Tests/RunCMake/Ninja/NinjaToolMissing-stderr.txt
new file mode 100644
index 0000000..1214288
--- /dev/null
+++ b/Tests/RunCMake/Ninja/NinjaToolMissing-stderr.txt
@@ -0,0 +1,6 @@
+^CMake Error at CMakeLists.txt:[0-9]+ \(project\):
+  Running
+
+   'ninja-tool-missing' '--version'
+
+  failed with:
diff --git a/Tests/RunCMake/Ninja/NinjaToolMissing.cmake b/Tests/RunCMake/Ninja/NinjaToolMissing.cmake
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/Tests/RunCMake/Ninja/NinjaToolMissing.cmake
diff --git a/Tests/RunCMake/Ninja/RunCMakeTest.cmake b/Tests/RunCMake/Ninja/RunCMakeTest.cmake
index 778f2c1..446dc3c 100644
--- a/Tests/RunCMake/Ninja/RunCMakeTest.cmake
+++ b/Tests/RunCMake/Ninja/RunCMakeTest.cmake
@@ -15,6 +15,12 @@ else()
   message(FATAL_ERROR "'ninja --version' reported:\n${ninja_out}")
 endif()
 
+function(run_NinjaToolMissing)
+  set(RunCMake_MAKE_PROGRAM ninja-tool-missing)
+  run_cmake(NinjaToolMissing)
+endfunction()
+run_NinjaToolMissing()
+
 function(run_CMP0058 case)
   # Use a single build tree for a few tests without cleaning.
   set(RunCMake_TEST_BINARY_DIR ${RunCMake_BINARY_DIR}/CMP0058-${case}-build)