inglorion created this revision.
inglorion added reviewers: tejohnson, pcc, rnk.
Herald added subscribers: arphaman, dexonsmith, steven_wu, mehdi_amini.
Herald added a project: clang.
This adds a -fthinlto-index= option to clang-cl, which allows it to
be used to drive ThinLTO backend passes. This allows clang-cl to be
used for distributed ThinLTO.
Repository:
rG LLVM Github Monorepo
https://reviews.llvm.org/D64458
Files:
clang/include/clang/Driver/Options.td
clang/lib/Driver/Driver.cpp
clang/test/Driver/cl-thinlto-backend.c
Index: clang/test/Driver/cl-thinlto-backend.c
===================================================================
--- /dev/null
+++ clang/test/Driver/cl-thinlto-backend.c
@@ -0,0 +1,9 @@
+// RUN: %clang_cl -c -flto=thin -Fo%t.obj %s
+// RUN: llvm-lto2 run -thinlto-distributed-indexes -o %t.exe %t.obj
+
+// -fthinlto_index should be passed to cc1
+// RUN: %clang_cl -### -c -fthinlto-index=%t.thinlto.bc -Fo%t1.obj \
+// RUN: %t.obj 2>&1 | FileCheck %s
+
+// CHECK: -fthinlto-index=
+// CHECK: "-x" "ir"
Index: clang/lib/Driver/Driver.cpp
===================================================================
--- clang/lib/Driver/Driver.cpp
+++ clang/lib/Driver/Driver.cpp
@@ -2119,6 +2119,13 @@
Diag(clang::diag::warn_drv_treating_input_as_cxx)
<< getTypeName(OldTy) << getTypeName(Ty);
}
+
+ // If the driver is invoked as clang-cl with -thinlto-index=,
+ // extensions that normally identify native object files actually
+ // identify LLVM bitcode files.
+ if (IsCLMode() && Ty == types::TY_Object &&
+ Args.hasArgNoClaim(options::OPT_fthinlto_index_EQ))
+ Ty = types::TY_LLVM_BC;
}
// -ObjC and -ObjC++ override the default language, but only for "source
Index: clang/include/clang/Driver/Options.td
===================================================================
--- clang/include/clang/Driver/Options.td
+++ clang/include/clang/Driver/Options.td
@@ -1270,7 +1270,7 @@
"of 0 means the number of threads will be derived from "
"the number of CPUs detected)">;
def fthinlto_index_EQ : Joined<["-"], "fthinlto-index=">,
- Flags<[CC1Option]>, Group<f_Group>,
+ Flags<[CoreOption, CC1Option]>, Group<f_Group>,
HelpText<"Perform ThinLTO importing using provided function summary index">;
def fmacro_backtrace_limit_EQ : Joined<["-"], "fmacro-backtrace-limit=">,
Group<f_Group>, Flags<[DriverOption, CoreOption]>;
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