From dbf76606c10d325eee673b82173ec0897e0db3ff Mon Sep 17 00:00:00 2001
From: "Niall Douglas (s [underscore] sourceforge {at} nedprod [dot] com)"
 <spamtrap@nedprod.com>
Date: Fri, 4 Oct 2019 18:34:02 +0100
Subject: A watershed: LLFIO finally works with clang coroutines! All unit
 tests pass.

---
 CMakeLists.txt | 71 +++++++++++++++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 68 insertions(+), 3 deletions(-)

(limited to 'CMakeLists.txt')

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2757afd5..8f36ac09 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -51,6 +51,8 @@ if(WIN32)
   add_subdirectory("include/llfio/ntkernel-error-category" EXCLUDE_FROM_ALL)
 endif()
 
+set(UNIT_TESTS_CXX_VERSION "latest" CACHE STRING "The version of C++ to use in the header-only unit tests")
+
 # Make the standard static and shared libraries, and if supported by this compiler, C++ modules
 # for both static and shared libraries as well. For the non-C++ module variants, makes the
 # interface headers into precompiled headers. Only builds all of them if this is the topmost
@@ -148,12 +150,32 @@ endif()
 # Set the library dependencies this library has
 all_link_libraries(PUBLIC quickcpplib::hl outcome::hl Threads::Threads)
 # Set the system dependencies this library has
+set(USING_LIBCXX_ON_LINUX 0)
 if(CMAKE_SYSTEM_NAME MATCHES "Linux")
   find_library(libstdcxx_stdcxxfs stdc++fs)
   if(libstdcxx_stdcxxfs MATCHES "NOTFOUND")
     set(libstdcxx_stdcxxfs -lstdc++fs)
   endif()
-  all_link_libraries(PUBLIC ${libstdcxx_stdcxxfs} rt)
+  get_target_property(val llfio_dl USING_LIBCXX_ON_LINUX)
+  if(val MATCHES "NOTFOUND")
+    all_link_libraries(PUBLIC ${libstdcxx_stdcxxfs} rt)
+  else()
+    set(USING_LIBCXX_ON_LINUX 1)
+    # We had to use libc++ to get coroutines on Linux, so don't link the filesystem TS
+    target_link_libraries(${PROJECT_NAME}_hl INTERFACE ${libstdcxx_stdcxxfs} rt)
+    target_link_libraries(${PROJECT_NAME}_sl PUBLIC ${libstdcxx_stdcxxfs} rt)
+    foreach(special ${SPECIAL_BUILDS})
+      target_link_libraries(${PROJECT_NAME}_sl-${special} PUBLIC ${libstdcxx_stdcxxfs} rt)
+    endforeach()
+    # Do make libc++ a requirement
+    target_compile_definitions(${PROJECT_NAME}_dl PUBLIC _LIBCPP_NO_EXPERIMENTAL_DEPRECATION_WARNING_FILESYSTEM=1)
+    target_compile_options(${PROJECT_NAME}_dl PUBLIC -stdlib=libc++)
+    target_link_libraries(${PROJECT_NAME}_dl PUBLIC -stdlib=libc++ -lc++abi)
+    foreach(special ${SPECIAL_BUILDS})
+      target_compile_options(${PROJECT_NAME}_dl-${special} PUBLIC -stdlib=libc++)
+      target_link_libraries(${PROJECT_NAME}_dl-${special} PUBLIC -stdlib=libc++ -lc++abi)
+    endforeach()
+  endif()
 endif()
 if(CMAKE_SYSTEM_NAME MATCHES "FreeBSD" OR APPLE)
   find_library(libcxx_cxxexperimental c++experimental)
@@ -207,8 +229,14 @@ if(NOT PROJECT_IS_DEPENDENCY)
   )
   foreach(test_target ${llfio_TEST_TARGETS})
     target_link_libraries(${test_target} PRIVATE kerneltest::hl)
-    if(test_target MATCHES "coroutines")
-      apply_cxx_coroutines_to(PRIVATE ${test_target})
+    if(test_target MATCHES coroutines)
+      if(USING_LIBCXX_ON_LINUX)
+        if(NOT test_target MATCHES _sl)
+          apply_cxx_coroutines_to(PRIVATE ${test_target})
+        endif()
+      else()
+        apply_cxx_coroutines_to(PRIVATE ${test_target})
+      endif()
     endif()
   endforeach()
   if(MSVC)
@@ -219,6 +247,43 @@ if(NOT PROJECT_IS_DEPENDENCY)
       endif()
     endforeach()
   endif()
+
+  # Turn on latest C++ where possible for the test suite
+  if(UNIT_TESTS_CXX_VERSION STREQUAL "latest")
+    set(LATEST_CXX_FEATURE)
+    foreach(feature ${CMAKE_CXX_COMPILE_FEATURES})
+      if(feature STREQUAL "cxx_std_23")
+        set(LATEST_CXX_FEATURE "cxx_std_23")
+        indented_message(STATUS "NOTE: This compiler claims to support C++ 23, enabling for header-only unit test suite")
+      endif()
+    endforeach()
+    if(NOT LATEST_CXX_FEATURE)
+      foreach(feature ${CMAKE_CXX_COMPILE_FEATURES})
+        if(feature STREQUAL "cxx_std_20")
+          set(LATEST_CXX_FEATURE "cxx_std_20")
+          indented_message(STATUS "NOTE: This compiler claims to support C++ 20, enabling for header-only unit test suite")
+        endif()
+      endforeach()
+    endif()
+    if(NOT LATEST_CXX_FEATURE)
+      foreach(feature ${CMAKE_CXX_COMPILE_FEATURES})
+        if(feature STREQUAL "cxx_std_17")
+          set(LATEST_CXX_FEATURE "cxx_std_17")
+          indented_message(STATUS "NOTE: This compiler claims to support C++ 17, enabling for header-only unit test suite")
+        endif()
+      endforeach()
+    endif()
+  elseif(UNIT_TESTS_CXX_VERSION)
+    set(LATEST_CXX_FEATURE "cxx_std_${UNIT_TESTS_CXX_VERSION}")
+  endif()
+  if(LATEST_CXX_FEATURE)
+    # Turn on latest C++ where possible for the header only test suite
+    foreach(test_target ${llfio_TEST_TARGETS} ${llfio_EXAMPLE_TARGETS})
+      if(test_target MATCHES _hl)
+        target_compile_features(${test_target} PUBLIC ${LATEST_CXX_FEATURE})
+      endif()
+    endforeach()
+  endif()
 endif()
 
 # Cache this library's auto scanned sources for later reuse
-- 
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