Support shorten_virtual_includes

Copybara Import from #438

BEGIN_PUBLIC
Support shorten_virtual_includes (#438)

Context: bazelbuild/bazel#26528, protocolbuffers/protobuf#20085

Enable `shorten_virtual_includes` for MSVC toolchains to shorten virtual include paths to mitigate long path issue on windows.

Closes #438
END_PUBLIC

COPYBARA_INTEGRATE_REVIEW=#438 from meteorcloudy:shorten_virtual_includes 5ab4b94
PiperOrigin-RevId: 781977791
Change-Id: Ia683103cb9da2eed8cca165ccf1243f3ee1357da

Author: meteorcloudy

cc/private/toolchain/BUILD.windows.tpl

@@ -330,6 +330,7 @@ cc_toolchain_config(
     dbg_mode_debug_flag = "%{dbg_mode_debug_flag_x64}",
     fastbuild_mode_debug_flag = "%{fastbuild_mode_debug_flag_x64}",
     supports_parse_showincludes = %{msvc_parse_showincludes_x64},
+    shorten_virtual_includes = True,
 )
 
 toolchain(
@@ -399,6 +400,7 @@ cc_toolchain_config(
     dbg_mode_debug_flag = "%{dbg_mode_debug_flag_x86}",
     fastbuild_mode_debug_flag = "%{fastbuild_mode_debug_flag_x86}",
     supports_parse_showincludes = %{msvc_parse_showincludes_x86},
+    shorten_virtual_includes = True,
 )
 
 toolchain(
@@ -468,6 +470,7 @@ cc_toolchain_config(
     dbg_mode_debug_flag = "%{dbg_mode_debug_flag_arm}",
     fastbuild_mode_debug_flag = "%{fastbuild_mode_debug_flag_arm}",
     supports_parse_showincludes = %{msvc_parse_showincludes_arm},
+    shorten_virtual_includes = True,
 )
 
 toolchain(
@@ -537,6 +540,7 @@ cc_toolchain_config(
     dbg_mode_debug_flag = "%{dbg_mode_debug_flag_arm64}",
     fastbuild_mode_debug_flag = "%{fastbuild_mode_debug_flag_arm64}",
     supports_parse_showincludes = %{msvc_parse_showincludes_arm64},
+    shorten_virtual_includes = True,
 )
 
 toolchain(

cc/private/toolchain/windows_cc_toolchain_config.bzl

@@ -943,6 +943,11 @@ def _impl(ctx):
             enabled = True,
         )
 
+        shorten_virtual_includes_feature = feature(
+            name = "shorten_virtual_includes",
+            enabled = ctx.attr.shorten_virtual_includes,
+        )
+
         treat_warnings_as_errors_feature = feature(
             name = "treat_warnings_as_errors",
             flag_sets = [
@@ -1277,6 +1282,7 @@ def _impl(ctx):
             preprocessor_defines_feature,
             parse_showincludes_feature,
             no_dotd_file_feature,
+            shorten_virtual_includes_feature,
             generate_pdb_file_feature,
             generate_linkmap_feature,
             shared_flag_feature,
@@ -1657,6 +1663,7 @@ cc_toolchain_config = rule(
         "msvc_lib_path": attr.string(default = "vc_installation_error.bat"),
         "msvc_link_path": attr.string(default = "vc_installation_error.bat"),
         "msvc_ml_path": attr.string(default = "vc_installation_error.bat"),
+        "shorten_virtual_includes": attr.bool(default = False),
         "supports_parse_showincludes": attr.bool(),
         "target_libc": attr.string(),
         "target_system_name": attr.string(),