From 14d7b78ea10d2dde302d63c9e374c9b910f2f15a Mon Sep 17 00:00:00 2001
From: Dan Gohman <dev@sunfishcode.online>
Date: Fri, 29 Jan 2021 13:16:12 -0800
Subject: [PATCH] In clang 11.0 and newer, use a relative sysroot path.

This makes use of https://reviews.llvm.org/D76653, which is in clang 11
and newer, to fix #53. With this, clang can find the sysroot relative to
its own path.

Fixes #58.
---
 Makefile | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index bde9936..71e3890 100644
--- a/Makefile
+++ b/Makefile
@@ -60,7 +60,11 @@ build/llvm.BUILT:
 		-DLLVM_TARGETS_TO_BUILD=WebAssembly \
 		-DLLVM_DEFAULT_TARGET_TRIPLE=wasm32-wasi \
 		-DLLVM_ENABLE_PROJECTS="lld;clang;clang-tools-extra" \
-		-DDEFAULT_SYSROOT=$(PREFIX)/share/wasi-sysroot \
+		$(if $(patsubst 9.%,,$(CLANG_VERSION)), \
+	             $(if $(patsubst 10.%,,$(CLANG_VERSION)), \
+		          -DDEFAULT_SYSROOT=../share/wasi-sysroot, \
+			  -DDEFAULT_SYSROOT=$(PREFIX)/share/wasi-sysroot), \
+		     -DDEFAULT_SYSROOT=$(PREFIX)/share/wasi-sysroot) \
 		-DLLVM_INSTALL_BINUTILS_SYMLINKS=TRUE \
 		$(LLVM_PROJ_DIR)/llvm
 	DESTDIR=$(DESTDIR) ninja $(NINJA_FLAGS) -v -C build/llvm \