From 310635492d19a196bde64624e5a93e4828827d76 Mon Sep 17 00:00:00 2001
From: Christoph Erhardt <christoph.erhardt@inovex.de>
Date: Fri, 13 Dec 2024 00:01:16 +0100
Subject: [PATCH] Add CMake interface library `GTest::gtest_prod`

Production code that contains `#include <gtest/gtest_prod.h>` should
link against this interface library: it sets the correct include path
for the compiler but does not instruct the linker to pull in any
GoogleTest library code.
---
 googletest/CMakeLists.txt         | 9 ++++++++-
 googletest/cmake/gtest_prod.pc.in | 7 +++++++
 2 files changed, 15 insertions(+), 1 deletion(-)
 create mode 100644 googletest/cmake/gtest_prod.pc.in

diff --git a/googletest/CMakeLists.txt b/googletest/CMakeLists.txt
index 2e5388945..0290a119c 100644
--- a/googletest/CMakeLists.txt
+++ b/googletest/CMakeLists.txt
@@ -116,10 +116,14 @@ include_directories(${gtest_build_include_dirs})
 #
 # Defines the gtest & gtest_main libraries. User tests should link
 # with one of them.
+# Production code that includes <gtest/gtest_prod.h> should link with the
+# interface library gtest_prod.
 
 # Google Test libraries. We build them using more strict warnings than what
 # are used for other targets, to ensure that gtest can be compiled by a user
 # aggressive about warnings.
+add_library_and_alias(gtest_prod INTERFACE)
+set_target_properties(gtest_prod PROPERTIES VERSION ${GOOGLETEST_VERSION})
 cxx_library(gtest "${cxx_strict}" src/gtest-all.cc)
 set_target_properties(gtest PROPERTIES VERSION ${GOOGLETEST_VERSION})
 if(GTEST_HAS_ABSL)
@@ -138,6 +142,9 @@ endif()
 cxx_library(gtest_main "${cxx_strict}" src/gtest_main.cc)
 set_target_properties(gtest_main PROPERTIES VERSION ${GOOGLETEST_VERSION})
 string(REPLACE ";" "$<SEMICOLON>" dirs "${gtest_build_include_dirs}")
+target_include_directories(gtest_prod SYSTEM INTERFACE
+  "$<BUILD_INTERFACE:${dirs}>"
+  "$<INSTALL_INTERFACE:$<INSTALL_PREFIX>/${CMAKE_INSTALL_INCLUDEDIR}>")
 target_include_directories(gtest SYSTEM INTERFACE
   "$<BUILD_INTERFACE:${dirs}>"
   "$<INSTALL_INTERFACE:$<INSTALL_PREFIX>/${CMAKE_INSTALL_INCLUDEDIR}>")
@@ -152,7 +159,7 @@ target_link_libraries(gtest_main PUBLIC gtest)
 ########################################################################
 #
 # Install rules.
-install_project(gtest gtest_main)
+install_project(gtest_prod gtest gtest_main)
 
 ########################################################################
 #
diff --git a/googletest/cmake/gtest_prod.pc.in b/googletest/cmake/gtest_prod.pc.in
new file mode 100644
index 000000000..856aee5b7
--- /dev/null
+++ b/googletest/cmake/gtest_prod.pc.in
@@ -0,0 +1,7 @@
+includedir=@CMAKE_INSTALL_FULL_INCLUDEDIR@
+
+Name: gtest_prod
+Description: GoogleTest (header for production code)
+Version: @PROJECT_VERSION@
+URL: https://github.com/google/googletest
+Cflags: -I${includedir}