Use precompiled headers when compiling with GCC.

The unix-adapter doesn't use PCH, because MSYS1's compiler doesn't support
them.

Makefile

@@ -30,6 +30,7 @@ default : all
 PREFIX := /usr/local
 UNIX_ADAPTER_EXE := console.exe
 MINGW_ENABLE_CXX11_FLAG := -std=c++11
+USE_PCH := 1
 
 COMMON_CXXFLAGS :=
 UNIX_CXXFLAGS :=
@@ -64,6 +65,23 @@ MINGW_CXXFLAGS += \
 MINGW_LDFLAGS += -static -static-libgcc -static-libstdc++
 UNIX_LDFLAGS += $(UNIX_LDFLAGS_STATIC)
 
+ifeq "$(USE_PCH)" "1"
+MINGW_CXXFLAGS += -include build/mingw/PrecompiledHeader.h
+PCH_DEP := build/mingw/PrecompiledHeader.h.gch
+else
+PCH_DEP :=
+endif
+
+build/mingw/PrecompiledHeader.h : src/shared/PrecompiledHeader.h | $$(@D)/.mkdir
+	$(info Copying $< to $@)
+	@cp $< $@
+
+build/mingw/PrecompiledHeader.h.gch : build/mingw/PrecompiledHeader.h | $$(@D)/.mkdir
+	$(info Compiling $<)
+	@$(MINGW_CXX) $(MINGW_CXXFLAGS) -c -o $@ $<
+
+-include build/mingw/PrecompiledHeader.h.d
+
 define def_unix_target
 build/$1/%.o : src/%.cc VERSION.txt | $$$$(@D)/.mkdir
 	$$(info Compiling $$<)
@@ -71,7 +89,7 @@ build/$1/%.o : src/%.cc VERSION.txt | $$$$(@D)/.mkdir
 endef
 
 define def_mingw_target
-build/$1/%.o : src/%.cc VERSION.txt | $$$$(@D)/.mkdir
+build/$1/%.o : src/%.cc VERSION.txt $$(PCH_DEP) | $$$$(@D)/.mkdir
 	$$(info Compiling $$<)
 	@$$(MINGW_CXX) $$(MINGW_CXXFLAGS) $2 -I src/include -c -o $$@ $$<
 endef

ship/ship.py

@@ -97,7 +97,7 @@ def buildTarget(target):
     os.environ["PATH"] = target["path"] + ";" + oldPath
     subprocess.check_call(["sh.exe", "configure"])
     subprocess.check_call(["make.exe", "clean"])
-    buildArgs = ["make.exe", "all", "tests"]
+    buildArgs = ["make.exe", "USE_PCH=0", "all", "tests"]
     if target.get("allow_parallel_make", True):
         buildArgs += ["-j8"]
     subprocess.check_call(buildArgs)

src/shared/PrecompiledHeader.h

@@ -0,0 +1,40 @@
+// Copyright (c) 2016 Ryan Prichard
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to
+// deal in the Software without restriction, including without limitation the
+// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+// sell copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+// IN THE SOFTWARE.
+
+#ifndef WINPTY_PRECOMPILED_HEADER_H
+#define WINPTY_PRECOMPILED_HEADER_H
+
+#include <windows.h>
+
+#include <stdarg.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <wchar.h>
+
+#include <array>
+#include <memory>
+#include <new>
+#include <string>
+#include <utility>
+#include <vector>
+
+#endif // WINPTY_PRECOMPILED_HEADER_H