[libc][obvious] add aligned_alloc as entrypoint

[michaelrj]

Summary

This patch adds aligned_alloc as an entrypoint. Previously it was being
included implicitly.

[sivachandra]

You should add a call to aligend_alloc in integration_test.cpp.

libc/config/linux/x86_64/entrypoints.txt

set(TARGET_LIBC_ENTRYPOINTS
     libc.src.stdlib.strtoll
     libc.src.stdlib.strtoul
     libc.src.stdlib.strtoull
 
     # stdlib.h external entrypoints
     libc.src.stdlib.malloc
     libc.src.stdlib.calloc
     libc.src.stdlib.realloc
+    libc.src.stdlib.aligned_alloc
     libc.src.stdlib.free
 
     # sys/mman.h entrypoints
     libc.src.sys.mman.mmap
     libc.src.sys.mman.munmap
 
     # sys/stat.h entrypoints
     libc.src.sys.stat.mkdir

libc/spec/stdc.td

HeaderSpec StdLib = HeaderSpec<
           FunctionSpec<"strtol", RetValSpec<LongType>, [ArgSpec<ConstCharRestrictedPtr>, ArgSpec<CharRestrictedPtrPtr>, ArgSpec<IntType>]>,
           FunctionSpec<"strtoll", RetValSpec<LongLongType>, [ArgSpec<ConstCharRestrictedPtr>, ArgSpec<CharRestrictedPtrPtr>, ArgSpec<IntType>]>,
           FunctionSpec<"strtoul", RetValSpec<UnsignedLongType>, [ArgSpec<ConstCharRestrictedPtr>, ArgSpec<CharRestrictedPtrPtr>, ArgSpec<IntType>]>,
           FunctionSpec<"strtoull", RetValSpec<UnsignedLongLongType>, [ArgSpec<ConstCharRestrictedPtr>, ArgSpec<CharRestrictedPtrPtr>, ArgSpec<IntType>]>,
 
           FunctionSpec<"malloc", RetValSpec<VoidPtr>, [ArgSpec<SizeTType>]>,
           FunctionSpec<"calloc", RetValSpec<VoidPtr>, [ArgSpec<SizeTType>, ArgSpec<SizeTType>]>,
           FunctionSpec<"realloc", RetValSpec<VoidPtr>, [ArgSpec<VoidPtr>, ArgSpec<SizeTType>]>,
+          FunctionSpec<"aligned_alloc", RetValSpec<VoidPtr>, [ArgSpec<SizeTType>, ArgSpec<SizeTType>]>,
           FunctionSpec<"free", RetValSpec<VoidType>, [ArgSpec<VoidPtr>]>,
 
           FunctionSpec<"_Exit", RetValSpec<NoReturn>, [ArgSpec<IntType>]>,
           FunctionSpec<"exit", RetValSpec<NoReturn>, [ArgSpec<IntType>]>,
           FunctionSpec<"atexit", RetValSpec<IntType>, [ArgSpec<AtexitHandlerT>]>,
       ]
   >;
 

libc/src/stdlib/CMakeLists.txt

DEPENDS
       ${SCUDO_DEPS}
   )
   add_entrypoint_external(
     realloc
     DEPENDS
       ${SCUDO_DEPS}
   )
   add_entrypoint_external(
+    aligned_alloc
+    DEPENDS
+      ${SCUDO_DEPS}
+  )
+  add_entrypoint_external(
     free
     DEPENDS
       ${SCUDO_DEPS}
   )
 else()
   add_entrypoint_external(
     malloc
   )
   add_entrypoint_external(
     calloc
   )
   add_entrypoint_external(
     realloc
   )
   add_entrypoint_external(
+    aligned_alloc
+  )
+  add_entrypoint_external(
     free
   )
 endif()
 
 if(NOT LLVM_LIBC_FULL_BUILD)
   return()
 endif()
 

libc/test/integration/scudo/CMakeLists.txt

 # is not complete enough to allow this. It is also desireable to
 # keep the dependencies as minimal as possible.
 add_entrypoint_library(
   libc_for_scudo_integration_test
   DEPENDS
     libc.src.stdlib.malloc
     libc.src.stdlib.calloc
     libc.src.stdlib.realloc
+    libc.src.stdlib.aligned_alloc
     libc.src.stdlib.free
 )
 
 add_executable(
   libc-scudo-integration-test
   integration_test.cpp
 )