bazel: Introduce __TOOLCHAIN_SYSROOT__

This will be useful later, when we update the toolchain to one based on CentOS Stream 9. Suggested-by: Roman Mohr <[email protected]> Signed-off-by: Andrea Bolognani <[email protected]>
cnchef · Oct 27, 2022 · 85fc5d9 · 85fc5d9
1 parent 9c6bccf
commit 85fc5d9
Showing 1 changed file with 8 additions and 0 deletions.
diff --git a/bazel/toolchain/x86_64-none-linux-gnu/cc_toolchain_config.bzl b/bazel/toolchain/x86_64-none-linux-gnu/cc_toolchain_config.bzl
@@ -62,6 +62,13 @@ def _impl(ctx):
         ),
     ]
 
+    # Update the value of __TOOLCHAIN_SYSROOT__ every time the list
+    # of cxx_builtin_include_directories has been modified.
+    #
+    # This is needed to make bazel realize that the updated toolchain
+    # is different from the previous one and handle caching correctly.
+    #
+    # https://github.com/kubevirt/kubevirt/pull/8404#issuecomment-1275096374
     default_compiler_flags = feature(
         name = "default_compiler_flags",
         enabled = True,
@@ -77,6 +84,7 @@ def _impl(ctx):
                             "-D__DATE__=\"redacted\"",
                             "-D__TIMESTAMP__=\"redacted\"",
                             "-D__TIME__=\"redacted\"",
+                            "-D__TOOLCHAIN_SYSROOT__=\"centos-stream-8\"",
                         ],
                     ),
                 ],