Create Zephyr external module

This update googletest to use it as Zephyr OS external module.
This allows downloading, configure and building googltest using
Zephyr west build system, without any user manipulation.

Signed-off-by: Alexandre Bailon <abailon@baylibre.com>

googletest/include/gtest/internal/gtest-port-arch.h

@@ -84,6 +84,9 @@
 #define GTEST_OS_GNU_HURD 1
 #elif defined(__GLIBC__) && defined(__FreeBSD_kernel__)
 #define GTEST_OS_GNU_KFREEBSD 1
+#elif defined(__ZEPHYR__)
+// Define it before linux as it could be built as a linux application
+#define GTEST_OS_ZEPHYR 1
 #elif defined __linux__
 #define GTEST_OS_LINUX 1
 #if defined __ANDROID__

googletest/include/gtest/internal/gtest-port.h

@@ -141,6 +141,7 @@
 //     GTEST_OS_WINDOWS_PHONE    - Windows Phone
 //     GTEST_OS_WINDOWS_RT       - Windows Store App/WinRT
 //   GTEST_OS_ZOS      - z/OS
+//   GTEST_OS_ZEPHYR   - Zephyr OS
 //
 // Among the platforms, Cygwin, Linux, Mac OS X, and Windows have the
 // most stable support.  Since core members of the Google Test project
@@ -516,6 +517,10 @@ typedef struct _RTL_CRITICAL_SECTION GTEST_CRITICAL_SECTION;
 #endif
 #endif  // GTEST_HAS_STD_WSTRING
 
+#ifdef GTEST_OS_ZEPHYR
+#define GTEST_HAS_FILE_SYSTEM 0
+#endif
+
 #ifndef GTEST_HAS_FILE_SYSTEM
 // Most platforms support a file system.
 #define GTEST_HAS_FILE_SYSTEM 1
@@ -2063,6 +2068,18 @@ inline int RmDir(const char* dir) { return rmdir(dir); }
 inline bool IsDir(const StatStruct& st) { return S_ISDIR(st.st_mode); }
 #endif
 
+#elif defined(GTEST_OS_ZEPHYR)
+static inline int FileNo(FILE* file) {
+  if (file == stdin)
+    return 1;
+  else if (file == stdout)
+    return 2;
+  else if (file == stderr)
+    return 3;
+  return -EINVAL;
+}
+
+static inline int isatty(int fd) { return true; }
 #else
 
 typedef struct stat StatStruct;

googletest/src/gtest-internal-inl.h

@@ -587,7 +587,7 @@ class GTEST_API_ UnitTestImpl {
   // total_test_suite_count() - 1. If i is not in that range, returns NULL.
   const TestSuite* GetTestSuite(int i) const {
     const int index = GetElementOr(test_suite_indices_, i, -1);
-    return index < 0 ? nullptr : test_suites_[static_cast<size_t>(i)];
+    return index < 0 ? nullptr : test_suites_[static_cast<size_t>(index)];
   }
 
   //  Legacy API is deprecated but still available

googletest/src/gtest.cc

@@ -43,7 +43,9 @@
 #include <algorithm>
 #include <chrono>  // NOLINT
 #include <cmath>
+#ifndef GTEST_OS_ZEPHYR
 #include <csignal>  // NOLINT: raise(3) is used on some platforms
+#endif
 #include <cstdint>
 #include <cstdlib>
 #include <cstring>

googletest/src/gtest_main.cc

@@ -47,8 +47,13 @@ void loop() { RUN_ALL_TESTS(); }
 }
 #endif
 
-#elif defined(GTEST_OS_QURT)
-// QuRT: program entry point is main, but argc/argv are unusable.
+#elif defined(GTEST_OS_QURT) || defined(GTEST_OS_ZEPHYR)
+// Program entry point is main, but argc/argv are unusable.
+
+#if defined(GTEST_OS_ZEPHYR)
+#undef GTEST_API_
+#define GTEST_API_
+#endif
 
 GTEST_API_ int main() {
   printf("Running main() from %s\n", __FILE__);

modules/googletest/CMakeLists.txt

@@ -0,0 +1,17 @@
+zephyr_library()
+
+# Disable use of pthreads in GoogleTest
+set(gtest_disable_pthreads ON CACHE BOOL "Build GoogleTest without Pthread")
+
+zephyr_include_directories_ifdef(CONFIG_GTEST ${ZEPHYR_GOOGLETEST_MODULE_DIR}/googletest/)
+zephyr_include_directories_ifdef(CONFIG_GTEST ${ZEPHYR_GOOGLETEST_MODULE_DIR}/googletest/include/)
+zephyr_library_sources_ifdef(CONFIG_GTEST
+    ${ZEPHYR_GOOGLETEST_MODULE_DIR}/googletest/src/gtest-all.cc
+)
+target_sources_ifdef(CONFIG_GTEST app PRIVATE
+    ${ZEPHYR_GOOGLETEST_MODULE_DIR}/googletest/src/gtest_main.cc
+)
+
+zephyr_include_directories_ifdef(CONFIG_GMOCK ${ZEPHYR_GOOGLETEST_MODULE_DIR}/googlemock/)
+zephyr_include_directories_ifdef(CONFIG_GMOCK ${ZEPHYR_GOOGLETEST_MODULE_DIR}/googlemock/include/)
+zephyr_library_sources_ifdef(CONFIG_GMOCK ${ZEPHYR_GOOGLETEST_MODULE_DIR}/googlemock/src/gmock-all.cc)

modules/googletest/Kconfig

@@ -0,0 +1,18 @@
+config GTEST
+    bool "GoogleTest test framework"
+    select TEST
+    select CPP
+    select REQUIRES_FULL_LIBCPP
+    select FPU
+
+config GMOCK
+    bool "GoogleMock mocking framework"
+    select GTEST
+
+choice STD_CPP
+	default STD_CPP14 if GTEST
+endchoice
+
+choice LIBC_IMPLEMENTATION
+	default NEWLIB_LIBC if GTEST
+endchoice

modules/modules.cmake

@@ -0,0 +1,2 @@
+set(ZEPHYR_GOOGLETEST_CMAKE_DIR ${CMAKE_CURRENT_LIST_DIR}/googletest)
+set(ZEPHYR_GOOGLETEST_KCONFIG   ${CMAKE_CURRENT_LIST_DIR}/googletest/Kconfig)

zephyr/module.yml

@@ -0,0 +1,6 @@
+name: googletest
+build:
+  cmake-ext: true
+  kconfig-ext: true
+  settings:
+    module_ext_root: .