[libcxx-commits] [libcxx] [libc++][doc] Use installed std modules in external projects. (PR #80601)

[Po-yao Chang via libcxx-commits]

================
@@ -168,58 +168,95 @@ This is a small sample program that uses the module ``std``. It consists of a
   #
   # Import the modules from libc++
   #
+  include(std.cmake)
+
+  add_executable(main main.cpp)
+
+.. code-block:: cmake
 
+  # std.cmake
   include(FetchContent)
   FetchContent_Declare(
-    std
-    URL "file://${LIBCXX_BUILD}/modules/c++/v1/"
+    std_module
+    URL "file://${LIBCXX_INSTALLED_DIR}/share/libc++/v1"
     DOWNLOAD_EXTRACT_TIMESTAMP TRUE
     SYSTEM
   )
-  FetchContent_MakeAvailable(std)
+
+  if (NOT std_module_POPULATED)
+    FetchContent_Populate(std_module)
+  endif()
 
   #
-  # Adjust project compiler flags
+  # Add std static library
   #
 
-  add_compile_options($<$<COMPILE_LANGUAGE:CXX>:-fprebuilt-module-path=${std_BINARY_DIR}/CMakeFiles/std.dir/>)
-  add_compile_options($<$<COMPILE_LANGUAGE:CXX>:-fprebuilt-module-path=${std_BINARY_DIR}/CMakeFiles/std.compat.dir/>)
-  add_compile_options($<$<COMPILE_LANGUAGE:CXX>:-nostdinc++>)
-  # The include path needs to be set to be able to use macros from headers.
-  # For example from, the headers <cassert> and <version>.
-  add_compile_options($<$<COMPILE_LANGUAGE:CXX>:-isystem>)
-  add_compile_options($<$<COMPILE_LANGUAGE:CXX>:${LIBCXX_BUILD}/include/c++/v1>)
+  add_library(std)
----------------
poyaoc97 wrote:

Missing "STATIC"?

https://github.com/llvm/llvm-project/pull/80601