From 7ea12d7edaffb9c22db0fd3aa510d2319cb24609 Mon Sep 17 00:00:00 2001
From: Sylvestre Ledru <sylvestre@debian.org>
Date: Tue, 30 Mar 2021 09:02:36 +0200
Subject: [PATCH] Cherry-pick https://reviews.llvm.org/D99501 to allow
 -flto=auto

---
 debian/changelog                           |  1 +
 debian/patches/D99501-ignore-lto-auto.diff | 31 ++++++++++++++++++++++
 debian/patches/series                      |  1 +
 3 files changed, 33 insertions(+)
 create mode 100644 debian/patches/D99501-ignore-lto-auto.diff

diff --git a/debian/changelog b/debian/changelog
index 0963e214..4e050ca4 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -4,6 +4,7 @@ llvm-toolchain-snapshot (1:13~++20210218085556+fcdef15d77bd-1~exp1) UNRELEASED;
   * New snapshot release
   * "run-clang-tidy" install it
   * Only enable libomp-13-doc on supported archs
+  * Cherry-pick https://reviews.llvm.org/D99501 to allow -flto=auto
 
   [ John Paul Adrian Glaubitz ]
   * Add upstream patch D98574 to fix clang macro definitions on sparc64
diff --git a/debian/patches/D99501-ignore-lto-auto.diff b/debian/patches/D99501-ignore-lto-auto.diff
new file mode 100644
index 00000000..eff887c2
--- /dev/null
+++ b/debian/patches/D99501-ignore-lto-auto.diff
@@ -0,0 +1,31 @@
+Index: llvm-toolchain-snapshot_13~++20210330090254+142d522dedbb/clang/include/clang/Driver/Driver.h
+===================================================================
+--- llvm-toolchain-snapshot_13~++20210330090254+142d522dedbb.orig/clang/include/clang/Driver/Driver.h
++++ llvm-toolchain-snapshot_13~++20210330090254+142d522dedbb/clang/include/clang/Driver/Driver.h
+@@ -51,7 +51,8 @@ enum LTOKind {
+   LTOK_None,
+   LTOK_Full,
+   LTOK_Thin,
+-  LTOK_Unknown
++  LTOK_Unknown,
++  LTOK_Ignored
+ };
+ 
+ /// Driver - Encapsulate logic for constructing compilation processes
+Index: llvm-toolchain-snapshot_13~++20210330090254+142d522dedbb/clang/lib/Driver/Driver.cpp
+===================================================================
+--- llvm-toolchain-snapshot_13~++20210330090254+142d522dedbb.orig/clang/lib/Driver/Driver.cpp
++++ llvm-toolchain-snapshot_13~++20210330090254+142d522dedbb/clang/lib/Driver/Driver.cpp
+@@ -610,9 +610,12 @@ void Driver::setLTOMode(const llvm::opt:
+   LTOMode = llvm::StringSwitch<LTOKind>(LTOName)
+                 .Case("full", LTOK_Full)
+                 .Case("thin", LTOK_Thin)
++                .Case("auto", LTOK_Ignored)
++                .Case("jobserver", LTOK_Ignored)
+                 .Default(LTOK_Unknown);
+ 
+   if (LTOMode == LTOK_Unknown) {
++    // FIXME: check if argument is a number, then ignore, or handle it
+     assert(A);
+     Diag(diag::err_drv_unsupported_option_argument) << A->getOption().getName()
+                                                     << A->getValue();
diff --git a/debian/patches/series b/debian/patches/series
index 32a80a3d..21caba1b 100644
--- a/debian/patches/series
+++ b/debian/patches/series
@@ -139,3 +139,4 @@ print-lldb-path.patch
 libcxx-armhf-ftbfs.diff
 lld-use-link-atomic-i386.diff
 lower-python-dep.diff
+D99501-ignore-lto-auto.diff