From 69ea5c43f3ef2fe08bed0edbe1d45d4553cbbee4 Mon Sep 17 00:00:00 2001
From: chriseth <chris@ethereum.org>
Date: Thu, 5 Oct 2017 11:56:36 +0200
Subject: [PATCH] Send all gas for 0.5.0.

---
 Changelog.md                               | 3 +++
 libsolidity/codegen/ExpressionCompiler.cpp | 3 +++
 2 files changed, 6 insertions(+)

diff --git a/Changelog.md b/Changelog.md
index 8ebc30d05..c78a26e0b 100644
--- a/Changelog.md
+++ b/Changelog.md
@@ -4,6 +4,9 @@ Features:
  * Parser: Better error message for unexpected trailing comma in parameter lists.
  * Syntax Checker: Unary ``+`` is now a syntax error as experimental 0.5.0 feature.
  * Type Checker: Disallow non-pure constant state variables as experimental 0.5.0 feature.
+ * Code Generator: Always use all available gas for calls as experimental 0.5.0 feature
+   (previously, some amount was retained in order to work in pre-tangerine whistle
+   EVM versions)
 
 Bugfixes:
  * Parser: Fix source location of VariableDeclarationStatement.
diff --git a/libsolidity/codegen/ExpressionCompiler.cpp b/libsolidity/codegen/ExpressionCompiler.cpp
index c2bf0f5cd..fe37baac2 100644
--- a/libsolidity/codegen/ExpressionCompiler.cpp
+++ b/libsolidity/codegen/ExpressionCompiler.cpp
@@ -1714,6 +1714,9 @@ void ExpressionCompiler::appendExternalFunctionCall(
 
 	if (_functionType.gasSet())
 		m_context << dupInstruction(m_context.baseToCurrentStackOffset(gasStackPos));
+	else if (m_context.experimentalFeatureActive(ExperimentalFeature::V050))
+		// Send all gas (requires tangerine whistle EVM)
+		m_context << Instruction::GAS;
 	else
 	{
 		// send all gas except the amount needed to execute "SUB" and "CALL"