From fa27c01c8666cb24821a0af3c58d6a23f8c54726 Mon Sep 17 00:00:00 2001
From: bloodstalker <thabogre@gmail.com>
Date: Thu, 20 Dec 2018 03:54:59 +0330
Subject: build uses pch now. kinda cool but our build time bottleneck seems to
 be linking

---
 cgrep.cpp | 24 +-----------------------
 makefile  | 15 ++++++++++-----
 pch.hpp   | 20 ++++++++++++++++++++
 3 files changed, 31 insertions(+), 28 deletions(-)
 create mode 100644 pch.hpp

diff --git a/cgrep.cpp b/cgrep.cpp
index 1c4ab3f..e09ad63 100644
--- a/cgrep.cpp
+++ b/cgrep.cpp
@@ -7,30 +7,8 @@
  * */
 /*************************************************************************************************/
 /*included modules*/
-/*project headers*/
+#include "./pch.hpp"
 #include "./cfe-extra/cfe_extra.h"
-/*standard headers*/
-#include <cassert>
-#include <cstdlib>
-#include <dirent.h>
-#include <fstream>
-#include <iostream>
-#include <regex>
-#include <string>
-#include <vector>
-/*LLVM headers*/
-#include "clang/AST/AST.h"
-#include "clang/AST/ASTConsumer.h"
-#include "clang/ASTMatchers/ASTMatchFinder.h"
-#include "clang/ASTMatchers/ASTMatchers.h"
-#include "clang/Basic/LLVM.h"
-#include "clang/Frontend/CompilerInstance.h"
-#include "clang/Frontend/FrontendActions.h"
-#include "clang/Lex/Lexer.h"
-#include "clang/Rewrite/Core/Rewriter.h"
-#include "clang/Tooling/CommonOptionsParser.h"
-#include "clang/Tooling/Tooling.h"
-#include "llvm/Support/raw_ostream.h"
 /*************************************************************************************************/
 /*used namespaces*/
 using namespace llvm;
diff --git a/makefile b/makefile
index 289d775..5ffe346 100644
--- a/makefile
+++ b/makefile
@@ -28,7 +28,8 @@ LLVM_CONF?=llvm-config
 LLVM_CXX_FLAGS=$(shell $(LLVM_CONF) --cxxflags)
 LLVM_CXX_FLAGS+=-I$(shell $(LLVM_CONF) --src-root)/tools/clang/include\
  -I$(shell $(LLVM_CONF) --obj-root)/tools/clang/include\
- -stdlib=libstdc++ -std=c++17 -fexceptions
+ -std=c++17 -fexceptions
+#LLVM_LD_FLAGS=-Wl,--start-group $(shell $(LLVM_CONF) --libs) -Wl, --end-group
 LLVM_LD_FLAGS=-Wl,--start-group -lclangAST -lclangAnalysis -lclangBasic\
  -lclangDriver -lclangEdit -lclangFrontend -lclangFrontendTool\
  -lclangLex -lclangParse -lclangSema -lclangEdit -lclangASTMatchers\
@@ -75,7 +76,7 @@ LD_FLAGS+=$(EXTRA_LD_FLAGS)
 
 .PHONY:all clean help ASM SO TAGS
 
-all:$(TARGET)
+all: pch.hpp.gch $(TARGET)
 
 everything:$(TARGET) A ASM SO $(TARGET)-dbg TAGS $(TARGET)-cov
 
@@ -89,8 +90,8 @@ depend:.depend
 
 -include ./.depend
 
-.cpp.o:
-	$(CXX) $(CXX_FLAGS) -c $< -o $@
+%.o:%.cpp
+	$(CXX) -include-pch pch.hpp.gch $(CXX_FLAGS) -c $< -o $@
 
 %.odbg:%.cpp
 	$(CXX) $(CXX_FLAGS) -g -c $< -o $@
@@ -98,6 +99,9 @@ depend:.depend
 %.ocov:%.cpp
 	$(CXX) $(CXX_FLAGS) $(COV_CXX) -c $< -o $@
 
+pch.hpp.gch: pch.hpp
+	$(CXX) $(CXX_FLAGS) -c $< -o $@
+
 ./cfe-extra/cfe_extra.o:./cfe-extra/cfe_extra.cpp
 	$(CXX) $(CXX_FLAGS) -c $< -o $@
 
@@ -162,12 +166,13 @@ format:
 	- clang-format -i $(SRCS) $(HDRS)
 
 clean:
-	rm -f *.o *.dis *.odbg *.ocov *~ $(TARGET) $(TARGET).so $(TARGET)-static $(TARGET)-dbg $(TARGET).a $(TARGET)-cov ./keccak-tiny/*.o ./keccak-tiny/*.ocov ./keccak-tiny/*.odbg
+	rm -f *.o *.dis *.odbg *.ocov *~ $(TARGET) $(TARGET).so $(TARGET)-static $(TARGET)-dbg $(TARGET).a $(TARGET)-cov
 
 deepclean: clean
 	- rm tags
 	- rm .depend
 	- $(MAKE) -C ./cfe-extra clean
+	- rm *.gch
 
 help:
 	@echo "--all is the default target, runs $(TARGET) target"
diff --git a/pch.hpp b/pch.hpp
new file mode 100644
index 0000000..6923390
--- /dev/null
+++ b/pch.hpp
@@ -0,0 +1,20 @@
+#include <cassert>
+#include <cstdlib>
+#include <dirent.h>
+#include <fstream>
+#include <iostream>
+#include <regex>
+#include <string>
+#include <vector>
+#include "clang/AST/AST.h"
+#include "clang/AST/ASTConsumer.h"
+#include "clang/ASTMatchers/ASTMatchFinder.h"
+#include "clang/ASTMatchers/ASTMatchers.h"
+#include "clang/Basic/LLVM.h"
+#include "clang/Frontend/CompilerInstance.h"
+#include "clang/Frontend/FrontendActions.h"
+#include "clang/Lex/Lexer.h"
+#include "clang/Rewrite/Core/Rewriter.h"
+#include "clang/Tooling/CommonOptionsParser.h"
+#include "clang/Tooling/Tooling.h"
+#include "llvm/Support/raw_ostream.h"
-- 
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