[𝘀𝗽𝗿] initial version

Created using spr 1.3.4

libcxx/CMakeLists.txt

@@ -102,6 +102,10 @@ option(LIBCXX_ENABLE_WIDE_CHARACTERS
    support the C functionality for wide characters. When wide characters are
    not supported, several parts of the library will be disabled, notably the
    wide character specializations of std::basic_string." ON)
+ option(LIBCXX_ENABLE_FATLTO
+   "Whether to compile libc++ with FatLTO enabled." ON)
+ option(LIBCXX_ENABLE_LTO
+   "Whether to compile libc++ with LTO enabled." ON)
 
 # To use time zone support in libc++ the platform needs to have the IANA
 # database installed. Libc++ will fail to build if this is enabled on a

libcxx/src/CMakeLists.txt

@@ -173,6 +173,16 @@ if (APPLE AND LLVM_USE_SANITIZER)
   endif()
 endif()
 
+
+if(LIBCXX_ENABLE_LTO)
+  list(APPEND LIBCXX_COMPILE_FLAGS "-flto")
+  list(APPEND LIBCXX_LINK_FLAGS "-flto")
+endif()
+if(LIBCXX_ENABLE_FATLTO)
+  list(APPEND LIBCXX_COMPILE_FLAGS "-ffat-lto-objects")
+  list(APPEND LIBCXX_LINK_FLAGS "-ffat-lto-objects")
+endif()
+
 split_list(LIBCXX_COMPILE_FLAGS)
 split_list(LIBCXX_LINK_FLAGS)
 

libcxxabi/src/CMakeLists.txt

@@ -143,6 +143,15 @@ if ( APPLE )
   endif()
 endif()
 
+if(LIBCXX_ENABLE_LTO)
+  list(APPEND LIBCXXABI_COMPILE_FLAGS "-flto")
+  list(APPEND LIBCXXABI_LINK_FLAGS "-flto")
+endif()
+if(LIBCXX_ENABLE_FATLTO)
+  list(APPEND LIBCXXABI_COMPILE_FLAGS "-ffat-lto-objects")
+  list(APPEND LIBCXXABI_LINK_FLAGS "-ffat-lto-objects")
+endif()
+
 split_list(LIBCXXABI_COMPILE_FLAGS)
 split_list(LIBCXXABI_LINK_FLAGS)
 
@@ -154,6 +163,7 @@ endif()
 
 include(WarningFlags)
 
+
 # Build the shared library.
 add_library(cxxabi_shared_objects OBJECT EXCLUDE_FROM_ALL ${LIBCXXABI_SOURCES} ${LIBCXXABI_HEADERS})
 cxx_add_warning_flags(cxxabi_shared_objects ${LIBCXXABI_ENABLE_WERROR} ${LIBCXXABI_ENABLE_PEDANTIC})