diff --git a/libc/cmake/modules/LLVMLibCCheckCpuFeatures.cmake b/libc/cmake/modules/LLVMLibCCheckCpuFeatures.cmake
--- a/libc/cmake/modules/LLVMLibCCheckCpuFeatures.cmake
+++ b/libc/cmake/modules/LLVMLibCCheckCpuFeatures.cmake
@@ -5,10 +5,6 @@
 # Initialize ALL_CPU_FEATURES as empty list.
 set(ALL_CPU_FEATURES "")
 
-if(LIBC_TARGET_ARCHITECTURE_IS_GPU)
-  return()
-endif()
-
 if(${LIBC_TARGET_ARCHITECTURE_IS_X86})
   set(ALL_CPU_FEATURES SSE2 SSE4_2 AVX AVX2 AVX512F AVX512BW FMA)
   set(LIBC_COMPILE_OPTIONS_NATIVE -march=native)
@@ -26,6 +22,10 @@
 #   <list of cpu features>
 # )
 function(cpu_supports output_var features)
+  if(LIBC_TARGET_ARCHITECTURE_IS_GPU)
+    unset(${output_var} PARENT_SCOPE)
+    return()
+  endif()
   _intersection(var "${LIBC_CPU_FEATURES}" "${features}")
   if("${var}" STREQUAL "${features}")
     set(${output_var} TRUE PARENT_SCOPE)
diff --git a/libc/config/gpu/entrypoints.txt b/libc/config/gpu/entrypoints.txt
--- a/libc/config/gpu/entrypoints.txt
+++ b/libc/config/gpu/entrypoints.txt
@@ -56,19 +56,8 @@
 
     # stdlib.h entrypoints
     libc.src.stdlib.abs
-    libc.src.stdlib.atoi
-    libc.src.stdlib.atof
-    libc.src.stdlib.atol
-    libc.src.stdlib.atoll
     libc.src.stdlib.labs
     libc.src.stdlib.llabs
-    libc.src.stdlib.strtod
-    libc.src.stdlib.strtof
-    libc.src.stdlib.strtol
-    libc.src.stdlib.strtold
-    libc.src.stdlib.strtoll
-    libc.src.stdlib.strtoul
-    libc.src.stdlib.strtoull
 
     # stdlib.h entrypoints
     libc.src.stdlib._Exit
diff --git a/libc/test/CMakeLists.txt b/libc/test/CMakeLists.txt
--- a/libc/test/CMakeLists.txt
+++ b/libc/test/CMakeLists.txt
@@ -22,7 +22,7 @@
   return()
 endif()
 
-if(NOT LIBC_TARGET_ARCHITECTURE_IS_GPU)
+if(NOT LIBC_GPU_TARGET_ARCHITECTURE_IS_NVPTX)
   add_subdirectory(src)
   add_subdirectory(utils)
 endif()
diff --git a/libc/test/UnitTest/CMakeLists.txt b/libc/test/UnitTest/CMakeLists.txt
--- a/libc/test/UnitTest/CMakeLists.txt
+++ b/libc/test/UnitTest/CMakeLists.txt
@@ -138,3 +138,12 @@
   target_compile_options(${lib} PRIVATE -fno-exceptions -fno-rtti)
   target_link_libraries(${lib} LibcUnitTest)
 endforeach()
+
+# The GPU needs these flags applied to override the system triple.
+if(LIBC_TARGET_ARCHITECTURE_IS_GPU)
+  foreach(lib LibcFPTestHelpers LibcMemoryHelpers)
+    target_include_directories(${lib} PRIVATE ${LIBC_BUILD_DIR}/include)
+    target_compile_options(${lib}
+        PRIVATE ${LIBC_HERMETIC_TEST_COMPILE_OPTIONS} -ffreestanding -nostdlib -nostdlib++)
+  endforeach()
+endif()
diff --git a/libc/test/src/CMakeLists.txt b/libc/test/src/CMakeLists.txt
--- a/libc/test/src/CMakeLists.txt
+++ b/libc/test/src/CMakeLists.txt
@@ -9,7 +9,7 @@
 
   if(MATH_UNITTEST_NEED_MPFR)
     if(NOT LIBC_TESTS_CAN_USE_MPFR)
-      message("WARNING: Math test ${name} will be skipped as MPFR library is not available.")
+      message(VERBOSE "Math test ${name} will be skipped as MPFR library is not available.")
       return()
     endif()
   endif()
@@ -61,9 +61,9 @@
 add_subdirectory(fenv)
 add_subdirectory(math)
 add_subdirectory(string)
+add_subdirectory(stdio)
 add_subdirectory(stdlib)
 add_subdirectory(inttypes)
-add_subdirectory(stdio)
 add_subdirectory(wchar)
 
 if(${LIBC_TARGET_OS} STREQUAL "linux")
diff --git a/libc/test/src/__support/CMakeLists.txt b/libc/test/src/__support/CMakeLists.txt
--- a/libc/test/src/__support/CMakeLists.txt
+++ b/libc/test/src/__support/CMakeLists.txt
@@ -54,15 +54,18 @@
     libc.src.__support.CPP.string_view
 )
 
-add_libc_test(
-  arg_list_test
-  SUITE
-    libc-support-tests
-  SRCS
-    arg_list_test.cpp
-  DEPENDS
-    libc.src.__support.arg_list
-)
+# The GPU does not support varargs currently.
+if(NOT LIBC_TARGET_ARCHITECTURE_IS_GPU)
+  add_libc_test(
+    arg_list_test
+    SUITE
+      libc-support-tests
+    SRCS
+      arg_list_test.cpp
+    DEPENDS
+      libc.src.__support.arg_list
+  )
+endif()
 
 add_libc_test(
   uint_test
diff --git a/libc/test/src/__support/File/CMakeLists.txt b/libc/test/src/__support/File/CMakeLists.txt
--- a/libc/test/src/__support/File/CMakeLists.txt
+++ b/libc/test/src/__support/File/CMakeLists.txt
@@ -1,6 +1,7 @@
-if(NOT (TARGET libc.src.__support.threads.mutex))
+if(NOT (TARGET libc.src.__support.threads.mutex) OR LIBC_TARGET_ARCHITECTURE_IS_GPU)
   # Not all platforms have a mutex implementation. If mutex is unvailable,
-  # we just skip everything about files.
+  # we just skip everything about files. The GPU has a mutex implementation but
+  # it is simply passthrough and can't be used.
   return()
 endif()
 
diff --git a/libc/test/src/__support/blockstore_test.cpp b/libc/test/src/__support/blockstore_test.cpp
--- a/libc/test/src/__support/blockstore_test.cpp
+++ b/libc/test/src/__support/blockstore_test.cpp
@@ -90,10 +90,10 @@
   populate_and_iterate<4, 10, true>();
 }
 
-TEST_F(LlvmLibcBlockStoreTest, Back) {
-  back_test<false>();
-  back_test<true>();
-}
+TEST_F(LlvmLibcBlockStoreTest, Back) { back_test<false>(); }
+
+// FIXME: The AMDGPU backend hangs if these function calls are combined.
+TEST_F(LlvmLibcBlockStoreTest, BackReverse) { back_test<true>(); }
 
 TEST_F(LlvmLibcBlockStoreTest, Empty) {
   empty_test<false>();
diff --git a/libc/test/src/errno/CMakeLists.txt b/libc/test/src/errno/CMakeLists.txt
--- a/libc/test/src/errno/CMakeLists.txt
+++ b/libc/test/src/errno/CMakeLists.txt
@@ -1,4 +1,4 @@
-if(NOT LLVM_LIBC_FULL_BUILD)
+if(NOT LLVM_LIBC_FULL_BUILD OR LIBC_TARGET_ARCHITECTURE_IS_GPU)
   return()
 endif()
 
diff --git a/libc/test/src/stdio/CMakeLists.txt b/libc/test/src/stdio/CMakeLists.txt
--- a/libc/test/src/stdio/CMakeLists.txt
+++ b/libc/test/src/stdio/CMakeLists.txt
@@ -1,5 +1,11 @@
 add_custom_target(libc_stdio_unittests)
 
+if(LIBC_TARGET_ARCHITECTURE_IS_GPU)
+  # These tests are all included on the GPU despite not having any stdio
+  # entrypoints.
+  return()
+endif()
+
 add_libc_unittest(
   fileop_test
   SUITE
diff --git a/libc/test/src/string/StrchrTest.h b/libc/test/src/string/StrchrTest.h
--- a/libc/test/src/string/StrchrTest.h
+++ b/libc/test/src/string/StrchrTest.h
@@ -120,7 +120,7 @@
   }
 
   void findsLastBehindFirstNullTerminator() {
-    const char src[6] = {'a', 'a', '\0', 'b', '\0', 'c'};
+    static const char src[6] = {'a', 'a', '\0', 'b', '\0', 'c'};
     // 'b' is behind a null terminator, so should not be found.
     ASSERT_STREQ(Func(src, 'b'), nullptr);
     // Same goes for 'c'.