Strip out hermetic llvm from the rocm toolchain. Use specific target for rocm gpu

.bazelrc.local

@@ -0,0 +1 @@
+common --repo_env=HERMETIC_PYTHON_VERSION=3.12

MODULE.bazel

@@ -146,6 +146,12 @@ use_repo(sycl_configure, "local_config_sycl", "oneapi", "level_zero", "zero_load
 hipcc_configure = use_extension("//extensions:hipcc_configure.bzl", "hipcc_configure_ext")
 use_repo(hipcc_configure, "config_rocm_hipcc")
 
+##############################################################
+# ROCm configuration
+
+hipcc_configure = use_extension("//extensions:hipcc_configure.bzl", "hipcc_configure_ext")
+use_repo(hipcc_configure, "config_rocm_hipcc")
+
 ##############################################################
 # Hermetic toolchain configuration
 

WORKSPACE

@@ -245,9 +245,3 @@ load("//gpu/rocm:hipcc_configure.bzl", "hipcc_configure")
 
 hipcc_configure(name = "config_rocm_hipcc")
 
-##############################################################
-# Local sysroot configuration
-
-load("//cc/sysroots:local_sysroot_configure.bzl", "local_sysroot_configure")
-
-local_sysroot_configure(name = "local_sysroot_config")

cc/features/BUILD

@@ -84,35 +84,11 @@ cc_feature(
 
 cc_toolchain_sysroot_feature(
     name = "sysroot_linux_x86_64",
-    enabled = True,
+    enabled = True,  # Always enabled for hermetic toolchain
     sysroot = "@sysroot_linux_x86_64//:sysroot",
     target = "x86_64-linux-gnu",
 )
 
-# Local sysroot feature - use system root instead of hermetic sysroot
-# Generic for all Linux architectures
-cc_feature(
-    name = "local_sysroot_linux",
-    enabled = True,
-    compiler_flags = ["--sysroot=/"],
-    linker_flags = ["--sysroot=/"],
-    env_sets = {
-        "HOST_SYSROOT": "/",
-    },
-)
-
-# When using local sysroot, we need to explicitly link default system libraries
-# since we don't use hermetic_libraries feature
-cc_feature(
-    name = "local_sysroot_default_libs",
-    enabled = True,
-    linker_flags = [
-        "-lstdc++",
-        "-lm",
-        "-lpthread",
-        "-ldl",
-    ],
-)
 
 cc_toolchain_sysroot_feature(
     name = "sysroot_linux_aarch64",
@@ -190,9 +166,9 @@ cc_feature(
     compiler_flags = [
         "-O0",
     ],
+    expand_if_not_available = "opt",
     #implies = ["generate_pdb_file"],
     provides = ["compilation_mode"],
-    expand_if_not_available = "opt",
 )
 
 cc_feature(
@@ -214,15 +190,37 @@ cc_feature(
     provides = ["compilation_mode"],
 )
 
+# Use hermetic libstdc++ instead of libc++
+# Provides GLIBCXX_3.4.25 (GCC 8) from hermetic sysroot
 cc_feature(
-    name = "libc++",
+    name = "use_libstdcxx",
     compiler_flags = [
-        # Allows the use of GNU-specific extension keywords that are not part of the standard C or C++ specifications
-        "-fgnu-keywords",
+        "-stdlib=libstdc++",
     ],
+    enabled = select({
+        "//cc/sysroots:libstdcxx_enabled": True,
+        "//conditions:default": False,
+    }),
     linker_flags = [
-        "-stdlib=libc++",
+        "-stdlib=libstdc++",
+    ],
+)
+
+# Statically link hermetic libstdc++ to avoid C++ ABI issues
+# Use this when you need to isolate from system libstdc++ (e.g., ROCm compatibility)
+# When enabled, also enables use_libstdcxx
+cc_feature(
+    name = "static_libstdcxx",
+    compiler_flags = [
+        "-stdlib=libstdc++",
+    ],
+    enabled = select({
+        "//cc/sysroots:static_libstdcxx_enabled": True,
+        "//conditions:default": False,
+    }),
+    linker_flags = [
+        "-stdlib=libstdc++",
+        "-static-libstdc++",
     ],
-    enabled = True,
 )
 

cc/impls/linux_x86_64_linux_x86_64/BUILD

@@ -198,6 +198,8 @@ FEATURES_ESSENTIAL = [
     "//third_party/rules_cc_toolchain/features:language",
     "//third_party/rules_cc_toolchain/features:use_lld",
     "//cc/features:sysroot_linux_x86_64",
+    "//cc/features:use_libstdcxx",
+    "//cc/features:static_libstdcxx",
     ":startup_libs_feature",
     "//third_party/rules_cc_toolchain/features:coverage",
     #"//cc/features:clang19",    # TODO: Add a selection mechanism based on the Clang version