diff --git a/libc/cmake/modules/LLVMLibCLibraryRules.cmake b/libc/cmake/modules/LLVMLibCLibraryRules.cmake
--- a/libc/cmake/modules/LLVMLibCLibraryRules.cmake
+++ b/libc/cmake/modules/LLVMLibCLibraryRules.cmake
@@ -75,7 +75,9 @@
   set(all_deps "")
   foreach(dep IN LISTS fq_deps_list)
     get_target_property(dep_type ${dep} "TARGET_TYPE")
-    if(NOT ((${dep_type} STREQUAL ${ENTRYPOINT_OBJ_TARGET_TYPE}) OR (${dep_type} STREQUAL ${ENTRYPOINT_EXT_TARGET_TYPE})))
+    if(NOT ((${dep_type} STREQUAL ${ENTRYPOINT_OBJ_TARGET_TYPE}) OR
+            (${dep_type} STREQUAL ${ENTRYPOINT_EXT_TARGET_TYPE}) OR
+            (${dep_type} STREQUAL ${ENTRYPOINT_OBJ_VENDOR_TARGET_TYPE})))
       message(FATAL_ERROR "Dependency '${dep}' of 'add_entrypoint_collection' is "
                           "not an 'add_entrypoint_object' or 'add_entrypoint_external' target.")
     endif()
diff --git a/libc/cmake/modules/LLVMLibCObjectRules.cmake b/libc/cmake/modules/LLVMLibCObjectRules.cmake
--- a/libc/cmake/modules/LLVMLibCObjectRules.cmake
+++ b/libc/cmake/modules/LLVMLibCObjectRules.cmake
@@ -492,6 +492,7 @@
 endfunction(add_object_library)
 
 set(ENTRYPOINT_OBJ_TARGET_TYPE "ENTRYPOINT_OBJ")
+set(ENTRYPOINT_OBJ_VENDOR_TARGET_TYPE "ENTRYPOINT_OBJ_VENDOR")
 
 # A rule for entrypoint object targets.
 # Usage:
@@ -509,12 +510,20 @@
 function(create_entrypoint_object fq_target_name)
   cmake_parse_arguments(
     "ADD_ENTRYPOINT_OBJ"
-    "ALIAS;REDIRECTED" # Optional argument
+    "ALIAS;REDIRECTED;VENDOR" # Optional argument
     "NAME;CXX_STANDARD" # Single value arguments
     "SRCS;HDRS;DEPENDS;COMPILE_OPTIONS;FLAGS"  # Multi value arguments
     ${ARGN}
   )
 
+  set(entrypoint_target_type ${ENTRYPOINT_OBJ_TARGET_TYPE})
+  if(${ADD_ENTRYPOINT_OBJ_VENDOR})
+    # TODO: We currently rely on external definitions of certain math functions
+    # provided by GPU vendors like AMD or Nvidia. We need to mark these so we
+    # don't end up running tests on these. In the future all of these should be
+    # implemented and this can be removed.
+    set(entrypoint_target_type ${ENTRYPOINT_OBJ_VENDOR_TARGET_TYPE})
+  endif()
   list(FIND TARGET_ENTRYPOINT_NAME_LIST ${ADD_ENTRYPOINT_OBJ_NAME} entrypoint_name_index)
   if(${entrypoint_name_index} EQUAL -1)
     add_custom_target(${fq_target_name})
@@ -522,7 +531,7 @@
       ${fq_target_name}
       PROPERTIES
         "ENTRYPOINT_NAME" ${ADD_ENTRYPOINT_OBJ_NAME}
-        "TARGET_TYPE" ${ENTRYPOINT_OBJ_TARGET_TYPE}
+        "TARGET_TYPE" ${entrypoint_target_type}
         "OBJECT_FILE" ""
         "OBJECT_FILE_RAW" ""
         "DEPS" ""
@@ -556,7 +565,8 @@
     endif()
 
     get_target_property(obj_type ${fq_dep_name} "TARGET_TYPE")
-    if((NOT obj_type) OR (NOT (${obj_type} STREQUAL ${ENTRYPOINT_OBJ_TARGET_TYPE})))
+    if((NOT obj_type) OR (NOT (${obj_type} STREQUAL ${ENTRYPOINT_OBJ_TARGET_TYPE} OR
+                               ${obj_type} STREQUAL ${ENTRYPOINT_OBJ_VENDOR_TARGET_TYPE})))
       message(FATAL_ERROR "The aliasee of an entrypoint alias should be an entrypoint.")
     endif()
 
@@ -568,7 +578,7 @@
       ${fq_target_name}
       PROPERTIES
         ENTRYPOINT_NAME ${ADD_ENTRYPOINT_OBJ_NAME}
-        TARGET_TYPE ${ENTRYPOINT_OBJ_TARGET_TYPE}
+        TARGET_TYPE ${entrypoint_target_type}
         IS_ALIAS "YES"
         OBJECT_FILE ""
         OBJECT_FILE_RAW ""
diff --git a/libc/cmake/modules/LLVMLibCTestRules.cmake b/libc/cmake/modules/LLVMLibCTestRules.cmake
--- a/libc/cmake/modules/LLVMLibCTestRules.cmake
+++ b/libc/cmake/modules/LLVMLibCTestRules.cmake
@@ -43,6 +43,10 @@
       if(object_file_raw)
         list(APPEND object_files ${object_file_raw})
       endif()
+    elseif(${dep_type} STREQUAL ${ENTRYPOINT_OBJ_VENDOR_TARGET_TYPE})
+      # We skip tests for all externally implemented entrypoints.
+      list(APPEND skipped_list ${dep})
+      continue()
     endif()
 
     get_target_property(indirect_deps ${dep} "DEPS")
diff --git a/libc/src/math/CMakeLists.txt b/libc/src/math/CMakeLists.txt
--- a/libc/src/math/CMakeLists.txt
+++ b/libc/src/math/CMakeLists.txt
@@ -27,6 +27,7 @@
       ALIAS
       DEPENDS
         .${LIBC_TARGET_ARCHITECTURE}.vendor.${name}
+      VENDOR
     )
     return()
   endif()
diff --git a/libc/src/math/gpu/CMakeLists.txt b/libc/src/math/gpu/CMakeLists.txt
--- a/libc/src/math/gpu/CMakeLists.txt
+++ b/libc/src/math/gpu/CMakeLists.txt
@@ -431,4 +431,4 @@
     ../truncf.h
   COMPILE_OPTIONS
     -O2
-)
\ No newline at end of file
+)
diff --git a/libc/src/math/gpu/vendor/CMakeLists.txt b/libc/src/math/gpu/vendor/CMakeLists.txt
--- a/libc/src/math/gpu/vendor/CMakeLists.txt
+++ b/libc/src/math/gpu/vendor/CMakeLists.txt
@@ -467,4 +467,4 @@
   COMPILE_OPTIONS
     ${bitcode_link_flags}
     -O2
-)
\ No newline at end of file
+)