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>;
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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