[PATCH] D51806: [clang-cl] Enable -march

[Alexandre Ganea via Phabricator via cfe-commits]

aganea created this revision.
aganea added reviewers: thakis, ddunbar, hans.
Herald added a subscriber: cfe-commits.

Currently, `-march` does not work in the `clang-cl` driver.

We are currently migrating from MSVC. The project size makes that we have to stick with `clang-cl` for a little while. However, we don't want to loose optimisation oportunities in the runtime code, and the MSVC flag `/arch` only supports a limited set of options.


Repository:
  rC Clang

https://reviews.llvm.org/D51806

Files:
  include/clang/Driver/Options.td


Index: include/clang/Driver/Options.td
===================================================================
--- include/clang/Driver/Options.td
+++ include/clang/Driver/Options.td
@@ -1931,7 +1931,7 @@
 def mwatchos_version_min_EQ : Joined<["-"], "mwatchos-version-min=">, Group<m_Group>;
 def mwatchos_simulator_version_min_EQ : Joined<["-"], "mwatchos-simulator-version-min=">;
 def mwatchsimulator_version_min_EQ : Joined<["-"], "mwatchsimulator-version-min=">, Alias<mwatchos_simulator_version_min_EQ>;
-def march_EQ : Joined<["-"], "march=">, Group<m_Group>;
+def march_EQ : Joined<["-"], "march=">, Group<m_Group>, Flags<[CoreOption]>;
 def masm_EQ : Joined<["-"], "masm=">, Group<m_Group>, Flags<[DriverOption]>;
 def mcmodel_EQ : Joined<["-"], "mcmodel=">, Group<m_Group>;
 def mimplicit_it_EQ : Joined<["-"], "mimplicit-it=">, Group<m_Group>;


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