[libc][NFC] split standalone_cpp into single headers

Previously, the entire support/CPP folder was in one header library,
which meant that a lot of headers were included where they shouldn't be.
This patch splits each header into its own target, as well as adjusting
each place they were included to only include what is used.

Reviewed By: sivachandra, lntue

Differential Revision: https://reviews.llvm.org/D121237

Author: michaelrj-google

libc/fuzzing/math/CMakeLists.txt

@@ -46,7 +46,7 @@ add_libc_fuzzer(
     libc.src.math.truncf
     libc.src.math.truncl
     libc.src.__support.FPUtil.fputil
-    libc.src.__support.CPP.standalone_cpp
+    libc.src.__support.CPP.type_traits
 )
 
 add_libc_fuzzer(

libc/src/__support/CMakeLists.txt

@@ -23,7 +23,7 @@ add_header_library(
     .ctype_utils
     libc.include.errno
     libc.src.errno.errno
-    libc.src.__support.CPP.standalone_cpp
+    libc.src.__support.CPP.limits
 )
 
 add_header_library(
@@ -44,7 +44,7 @@ add_header_library(
     .high_precision_decimal
     libc.include.errno
     libc.src.errno.errno
-    libc.src.__support.CPP.standalone_cpp
+    libc.src.__support.CPP.limits
     libc.src.__support.FPUtil.fputil
 )
 

libc/src/__support/CPP/CMakeLists.txt

@@ -1,15 +1,56 @@
-# TODO(michaelrj): separate the standalone_cpp library into individual targets.
 add_header_library(
-  standalone_cpp
+  array
   HDRS
     Array.h
+)
+
+add_header_library(
+  array_ref
+  HDRS
     ArrayRef.h
+)
+
+
+add_header_library(
+  bit
+  HDRS
     Bit.h
+)
+
+
+add_header_library(
+  bitset
+  HDRS
     Bitset.h
+)
+
+add_header_library(
+  functional
+  HDRS
     Functional.h
+)
+
+add_header_library(
+  limits
+  HDRS
     Limits.h
+)
+
+add_header_library(
+  string_view
+  HDRS
     StringView.h
+)
+
+add_header_library(
+  type_traits
+  HDRS
     TypeTraits.h
+)
+
+add_header_library(
+  utility
+  HDRS
     Utility.h
 )
 

libc/src/__support/FPUtil/CMakeLists.txt

@@ -1,3 +1,4 @@
+#TODO(michaelrj): separate the fputil library into individual targets.
 add_header_library(
   fputil
   HDRS
@@ -19,7 +20,8 @@ add_header_library(
     libc.include.errno
     libc.include.fenv
     libc.src.__support.common
-    libc.src.__support.CPP.standalone_cpp
+    libc.src.__support.CPP.type_traits
+    libc.src.__support.CPP.bit
     libc.src.errno.errno
 )
 

libc/src/string/CMakeLists.txt

@@ -5,7 +5,7 @@ add_header_library(
   HDRS
     string_utils.h
   DEPENDS
-    libc.src.__support.CPP.standalone_cpp
+    libc.src.__support.CPP.bitset
 )
 
 add_entrypoint_object(
@@ -210,7 +210,7 @@ add_entrypoint_object(
   HDRS
     strspn.h
   DEPENDS
-    libc.src.__support.CPP.standalone_cpp
+    libc.src.__support.CPP.bitset
 )
 
 add_entrypoint_object(

libc/src/string/memory_utils/CMakeLists.txt

@@ -1,3 +1,4 @@
+#TODO(michaelrj): split out the implementations from memory_utils
 add_header_library(
   memory_utils
   HDRS
@@ -8,7 +9,7 @@ add_header_library(
     memcpy_implementations.h
     memset_implementations.h
   DEPS
-    standalone_cpp
+    libc.src.__support.CPP.bit
 )
 
 add_header_library(

libc/test/src/__support/CPP/CMakeLists.txt

@@ -7,7 +7,7 @@ add_libc_unittest(
   SRCS
     bitset_test.cpp
   DEPENDS
-    libc.src.__support.CPP.standalone_cpp
+    libc.src.__support.CPP.bitset
 )
 
 add_libc_unittest(
@@ -17,7 +17,7 @@ add_libc_unittest(
   SRCS
     stringview_test.cpp
   DEPENDS
-    libc.src.__support.CPP.standalone_cpp
+    libc.src.__support.CPP.string_view
 )
 
 add_libc_unittest(
@@ -27,7 +27,7 @@ add_libc_unittest(
   SRCS
     limits_test.cpp
   DEPENDS
-    libc.src.__support.CPP.standalone_cpp
+    libc.src.__support.CPP.limits
 )
 
 add_libc_unittest(
@@ -37,7 +37,7 @@ add_libc_unittest(
   SRCS
     arrayref_test.cpp
   DEPENDS
-    libc.src.__support.CPP.standalone_cpp
+    libc.src.__support.CPP.array_ref
 )
 
 add_libc_unittest(
@@ -57,7 +57,7 @@ add_libc_unittest(
   SRCS
     integer_sequence_test.cpp
   DEPENDS
-    libc.src.__support.CPP.standalone_cpp
+    libc.src.__support.CPP.utility
 )
 
 add_libc_unittest(

libc/test/src/math/CMakeLists.txt

@@ -12,7 +12,7 @@ add_fp_unittest(
   DEPENDS
     libc.include.errno
     libc.src.math.cosf
-    libc.src.__support.CPP.standalone_cpp
+    libc.src.__support.CPP.array
     libc.src.__support.FPUtil.fputil
 )
 
@@ -40,7 +40,7 @@ add_fp_unittest(
   DEPENDS
     libc.include.errno
     libc.src.math.sinf
-    libc.src.__support.CPP.standalone_cpp
+    libc.src.__support.CPP.array
     libc.src.__support.FPUtil.fputil
 )
 
@@ -68,7 +68,7 @@ add_fp_unittest(
   DEPENDS
     libc.include.errno
     libc.src.math.sincosf
-    libc.src.__support.CPP.standalone_cpp
+    libc.src.__support.CPP.array
     libc.src.__support.FPUtil.fputil
 )
 

libc/test/src/math/exhaustive/CMakeLists.txt

@@ -6,8 +6,6 @@ add_object_library(
     exhaustive_test.h
   SRCS
     exhaustive_test.cpp
-  DEPENDS
-    libc.src.__support.CPP.standalone_cpp
 )
 
 add_fp_unittest(

libc/test/src/stdlib/CMakeLists.txt

@@ -226,7 +226,8 @@ if(LLVM_LIBC_FULL_BUILD)
       libc.src.stdlib._Exit
       libc.src.stdlib.exit
       libc.src.stdlib.atexit
-      libc.src.__support.CPP.standalone_cpp
+      libc.src.__support.CPP.array
+      libc.src.__support.CPP.utility
   )
 
   # add_libc_unittest(