From 03b931322f8e197807d4dd6c43debaa77cd6f248 Mon Sep 17 00:00:00 2001
From: Tom <git@thomastrapp.com>
Date: Wed, 19 May 2021 13:22:57 +0200
Subject: [PATCH] cmake: use 'Catch2' as an optional dependency

Omit target 'sgnl-test' if Catch2 is unavailable.
---
 test/CMakeLists.txt | 20 +++++++++++---------
 1 file changed, 11 insertions(+), 9 deletions(-)

diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index 80fa67d..4fa512b 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -4,14 +4,16 @@ project(signal-wrangler-test)
 include(EnableWarnings)
 include(DefaultBuildRelease)
 
-find_package(Catch2 REQUIRED)
+find_package(Catch2 QUIET)
 
-add_executable(
-  sgnl-test
-  EXCLUDE_FROM_ALL
-  "${PROJECT_SOURCE_DIR}/test.cpp")
-enable_warnings(sgnl-test PRIVATE)
-target_link_libraries(sgnl-test sgnl::sgnl Catch2::Catch2 "-fsanitize=thread")
-target_compile_features(sgnl-test PUBLIC cxx_std_17)
-target_compile_options(sgnl-test PUBLIC "-fsanitize=thread")
+if( Catch2_FOUND )
+  add_executable(
+    sgnl-test
+    EXCLUDE_FROM_ALL
+    "${PROJECT_SOURCE_DIR}/test.cpp")
+  enable_warnings(sgnl-test PRIVATE)
+  target_link_libraries(sgnl-test sgnl::sgnl Catch2::Catch2 "-fsanitize=thread")
+  target_compile_features(sgnl-test PUBLIC cxx_std_17)
+  target_compile_options(sgnl-test PUBLIC "-fsanitize=thread")
+endif()