From 3572d52ace485884d7abbcef365d04cd4dd95020 Mon Sep 17 00:00:00 2001
From: Christian Parpart <christian@parpart.family>
Date: Mon, 14 Mar 2022 16:52:33 +0100
Subject: [PATCH] Adds EMSCRIPTEN preprocessor definition to libsolidity build
 & avoid accessing filesystem::current_path() if building for Emscripten.

---
 libsolidity/CMakeLists.txt           | 4 ++++
 libsolidity/interface/FileReader.cpp | 8 +++++++-
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/libsolidity/CMakeLists.txt b/libsolidity/CMakeLists.txt
index 3d2845463..b686f94c1 100644
--- a/libsolidity/CMakeLists.txt
+++ b/libsolidity/CMakeLists.txt
@@ -176,3 +176,7 @@ set(sources
 
 add_library(solidity ${sources})
 target_link_libraries(solidity PUBLIC yul evmasm langutil smtutil solutil Boost::boost fmt::fmt-header-only)
+
+if(EMSCRIPTEN)
+	target_compile_definitions(solidity PRIVATE EMSCRIPTEN=1)
+endif()
diff --git a/libsolidity/interface/FileReader.cpp b/libsolidity/interface/FileReader.cpp
index 8300feb57..67c144c52 100644
--- a/libsolidity/interface/FileReader.cpp
+++ b/libsolidity/interface/FileReader.cpp
@@ -244,7 +244,13 @@ boost::filesystem::path FileReader::normalizeCLIPathForVFS(
 	// - Preserves case. Even if the filesystem is case-insensitive but case-preserving and the
 	//   case differs, the actual case from disk is NOT detected.
 
-	boost::filesystem::path canonicalWorkDir = boost::filesystem::weakly_canonical(boost::filesystem::current_path());
+	boost::filesystem::path canonicalWorkDir =
+#if defined(EMSCRIPTEN)
+		boost::filesystem::path("/")
+#else
+		boost::filesystem::weakly_canonical(boost::filesystem::current_path())
+#endif
+		;
 
 	// NOTE: On UNIX systems the path returned from current_path() has symlinks resolved while on
 	// Windows it does not. To get consistent results we resolve them on all platforms.