[libc] Add GPU support for the 'inttypes.h' functions

[jhuber6]

Summary

Another low hanging fruit we can put on the GPU, this ports the tests
over to the hermetic framework so we can run them on the GPU.

libc/config/gpu/api.td

def StdIOAPI : PublicAPI<"stdio.h"> {
   let Macros = [
     SimpleMacroDef<"_IOFBF", "0">,
     SimpleMacroDef<"_IOLBF", "1">,
     SimpleMacroDef<"_IONBF", "2">,
     SimpleMacroDef<"EOF", "-1">,
   ];
   let Types = ["size_t", "FILE"];
 }
+
+def IntTypesAPI : PublicAPI<"inttypes.h"> {
+  let Types = ["imaxdiv_t"];
+}

libc/config/gpu/entrypoints.txt

set(TARGET_LIBC_ENTRYPOINTS
 
     # stdio.h entrypoints
     libc.src.stdio.puts
     libc.src.stdio.fputs
     libc.src.stdio.stdin
     libc.src.stdio.stdout
     libc.src.stdio.stderr
 
+    # inttypes.h entrypoints
+    libc.src.inttypes.imaxabs
+    libc.src.inttypes.imaxdiv
+    libc.src.inttypes.strtoimax
+    libc.src.inttypes.strtoumax
+
     # gpu/rpc.h entrypoints
     libc.src.gpu.rpc_reset
 )
 
 set(TARGET_LIBM_ENTRYPOINTS
     # math.h entrypoints
     libc.src.math.fma
     libc.src.math.fmaf

libc/config/gpu/headers.txt

 set(TARGET_PUBLIC_HEADERS
     libc.include.ctype
     libc.include.string
+    libc.include.inttypes
     libc.include.math
     libc.include.fenv
     libc.include.errno
     libc.include.stdlib
     libc.include.stdio
 
     # Header for RPC extensions
     libc.include.gpu_rpc
 )

libc/docs/gpu/support.rst

 strtof         |check|
 strtol         |check|
 strtold        |check|
 strtoll        |check|
 strtoul        |check|
 strtoull       |check|
 =============  =========  ============
 
+inttypes.h
+--------
+
+=============  =========  ============
+Function Name  Available  RPC Required
+=============  =========  ============
+imaxabs        |check|
+imaxdiv        |check|
+strtoimax      |check|
+strtoumax      |check|
+=============  =========  ============
+
 stdio.h
 --------
 
 =============  =========  ============
 Function Name  Available  RPC Required
 =============  =========  ============
 puts           |check|    |check|
 fputs          |check|    |check|
 =============  =========  ============

libc/test/src/inttypes/CMakeLists.txt

-add_custom_target(libc_inttypes_unittests)
+add_custom_target(libc_inttypes_tests)
 
-add_libc_unittest(
+add_libc_test(
   strtoimax_test
   SUITE
-    libc_inttypes_unittests
+    libc_inttypes_tests
   SRCS
     strtoimax_test.cpp
   DEPENDS
     libc.src.inttypes.strtoimax
     libc.test.src.stdlib.strtol_test_support
 )
 
-add_libc_unittest(
+add_libc_test(
   strtoumax_test
   SUITE
-    libc_inttypes_unittests
+    libc_inttypes_tests
   SRCS
     strtoumax_test.cpp
   DEPENDS
     libc.src.inttypes.strtoumax
     libc.test.src.stdlib.strtol_test_support
 )
 
-add_libc_unittest(
+add_libc_test(
   imaxdiv_test
   SUITE
-    libc_inttypes_unittests
+    libc_inttypes_tests
   SRCS
     imaxdiv_test.cpp
   HDRS
     ../stdlib/DivTest.h
   DEPENDS
     libc.include.stdlib
     libc.src.inttypes.imaxdiv
 )
 
-add_libc_unittest(
+add_libc_test(
   imaxabs_test
   SUITE
-    libc_inttypes_unittests
+    libc_inttypes_tests
   SRCS
     imaxabs_test.cpp
   HDRS
     ../stdlib/DivTest.h
   DEPENDS
     libc.include.stdlib
     libc.src.inttypes.imaxabs
 )