From: Boyuan Yang <byang@debian.org>
Date: Thu, 21 Sep 2023 20:27:45 -0400
Subject: Use googletest lib built from source

Forwarded: not-needed
---
 CMakeLists.txt | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3ec4398..2f55f95 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -98,10 +98,24 @@ if(NOT ENABLE_THREADING)
 endif()
 
 if(BUILD_TEST)
-  find_package(GTest REQUIRED)
+  find_package(GTest)
   if(GTEST_FOUND)
     enable_testing()
     include_directories(${GTEST_INCLUDE_DIRS})
+  else()
+    # Debian-specific: build gtest as library from source code
+    set(GTEST_SRC_DIR /usr/src/googletest/googletest CACHE STRING "Location of gest sources")
+    if(EXISTS ${GTEST_SRC_DIR}/src/gtest-all.cc)
+      message(STATUS "building gtest from sources in ${GTEST_SRC_DIR}")
+      set(gtest_sources ${GTEST_SRC_DIR}/src/gtest-all.cc)
+      add_library(gtest STATIC ${gtest_sources})
+      include_directories(${GTEST_SRC_DIR})
+      include_directories(${GTEST_SRC_DIR}/include)
+      set(GTEST_LIBRARIES gtest)
+      enable_testing()
+    else()
+      message(FATAL_ERROR "BUILD_TEST is set but unable to find gtest library")
+    endif()
   endif()
 endif()