From f6f1e11e5cd3dd11f12cadedd3011de1ba7e1c58 Mon Sep 17 00:00:00 2001
From: Ther <1329438302@qq.com>
Date: Sun, 26 Jun 2022 12:02:05 +0800
Subject: [PATCH] chore: initial commit

---
 .clang-format                                 | 168 ++++++++++
 .gitignore                                    |  46 +++
 Compile_ToolChains/00-makefile/invsqrt.cpp    |  14 +
 Compile_ToolChains/00-makefile/invsqrt.h      |   6 +
 Compile_ToolChains/00-makefile/main.cpp       |  13 +
 Compile_ToolChains/00-makefile/makefile       |  14 +
 Compile_ToolChains/01-basic/CMakeLists.txt    |  10 +
 Compile_ToolChains/01-basic/main.cpp          |   6 +
 .../02-multifiles/CMakeLists.txt              |  12 +
 .../02-multifiles/include/invsqrt.h           |   6 +
 .../02-multifiles/src/invsqrt.cpp             |  14 +
 Compile_ToolChains/02-multifiles/src/main.cpp |  13 +
 .../03-static-libraries/CMakeLists.txt        |  10 +
 .../03-static-libraries/include/invsqrt.h     |   6 +
 .../03-static-libraries/src/invsqrt.cpp       |  16 +
 .../03-static-libraries/src/main.cpp          |  13 +
 .../04-shared-libraries/CMakeLists.txt        |  10 +
 .../04-shared-libraries/include/invsqrt.h     |   6 +
 .../04-shared-libraries/src/invsqrt.cpp       |  16 +
 .../04-shared-libraries/src/main.cpp          |  13 +
 .../05-third-party/CMakeLists.txt             |  14 +
 .../05-third-party/include/mysqrt.h           |   6 +
 .../05-third-party/src/main.cpp               |  22 ++
 .../05-third-party/src/mysqrt.cpp             |  15 +
 Compile_ToolChains/README.md                  | 292 ++++++++++++++++++
 25 files changed, 761 insertions(+)
 create mode 100644 .clang-format
 create mode 100644 .gitignore
 create mode 100644 Compile_ToolChains/00-makefile/invsqrt.cpp
 create mode 100644 Compile_ToolChains/00-makefile/invsqrt.h
 create mode 100644 Compile_ToolChains/00-makefile/main.cpp
 create mode 100644 Compile_ToolChains/00-makefile/makefile
 create mode 100644 Compile_ToolChains/01-basic/CMakeLists.txt
 create mode 100644 Compile_ToolChains/01-basic/main.cpp
 create mode 100644 Compile_ToolChains/02-multifiles/CMakeLists.txt
 create mode 100644 Compile_ToolChains/02-multifiles/include/invsqrt.h
 create mode 100644 Compile_ToolChains/02-multifiles/src/invsqrt.cpp
 create mode 100644 Compile_ToolChains/02-multifiles/src/main.cpp
 create mode 100644 Compile_ToolChains/03-static-libraries/CMakeLists.txt
 create mode 100644 Compile_ToolChains/03-static-libraries/include/invsqrt.h
 create mode 100644 Compile_ToolChains/03-static-libraries/src/invsqrt.cpp
 create mode 100644 Compile_ToolChains/03-static-libraries/src/main.cpp
 create mode 100644 Compile_ToolChains/04-shared-libraries/CMakeLists.txt
 create mode 100644 Compile_ToolChains/04-shared-libraries/include/invsqrt.h
 create mode 100644 Compile_ToolChains/04-shared-libraries/src/invsqrt.cpp
 create mode 100644 Compile_ToolChains/04-shared-libraries/src/main.cpp
 create mode 100644 Compile_ToolChains/05-third-party/CMakeLists.txt
 create mode 100644 Compile_ToolChains/05-third-party/include/mysqrt.h
 create mode 100644 Compile_ToolChains/05-third-party/src/main.cpp
 create mode 100644 Compile_ToolChains/05-third-party/src/mysqrt.cpp
 create mode 100644 Compile_ToolChains/README.md

diff --git a/.clang-format b/.clang-format
new file mode 100644
index 0000000..f2dd0de
--- /dev/null
+++ b/.clang-format
@@ -0,0 +1,168 @@
+---
+Language:        Cpp
+# BasedOnStyle:  Google
+AccessModifierOffset: -1
+AlignAfterOpenBracket: Align
+AlignConsecutiveMacros: false
+AlignConsecutiveAssignments: false
+AlignConsecutiveDeclarations: false
+AlignEscapedNewlines: Left
+AlignOperands:   true
+AlignTrailingComments: true
+AllowAllArgumentsOnNextLine: true
+AllowAllConstructorInitializersOnNextLine: true
+AllowAllParametersOfDeclarationOnNextLine: true
+AllowShortBlocksOnASingleLine: Never
+AllowShortCaseLabelsOnASingleLine: false
+AllowShortFunctionsOnASingleLine: All
+AllowShortLambdasOnASingleLine: All
+AllowShortIfStatementsOnASingleLine: WithoutElse
+AllowShortLoopsOnASingleLine: true
+AlwaysBreakAfterDefinitionReturnType: None
+AlwaysBreakAfterReturnType: None
+AlwaysBreakBeforeMultilineStrings: true
+AlwaysBreakTemplateDeclarations: Yes
+BinPackArguments: true
+BinPackParameters: true
+BraceWrapping:
+  AfterCaseLabel:  false
+  AfterClass:      false
+  AfterControlStatement: false
+  AfterEnum:       false
+  AfterFunction:   false
+  AfterNamespace:  false
+  AfterObjCDeclaration: false
+  AfterStruct:     false
+  AfterUnion:      false
+  AfterExternBlock: false
+  BeforeCatch:     false
+  BeforeElse:      false
+  IndentBraces:    false
+  SplitEmptyFunction: true
+  SplitEmptyRecord: true
+  SplitEmptyNamespace: true
+BreakBeforeBinaryOperators: None
+BreakBeforeBraces: Attach
+BreakBeforeInheritanceComma: false
+BreakInheritanceList: BeforeColon
+BreakBeforeTernaryOperators: true
+BreakConstructorInitializersBeforeComma: false
+BreakConstructorInitializers: BeforeColon
+BreakAfterJavaFieldAnnotations: false
+BreakStringLiterals: true
+ColumnLimit:     80
+CommentPragmas:  '^ IWYU pragma:'
+CompactNamespaces: false
+ConstructorInitializerAllOnOneLineOrOnePerLine: true
+ConstructorInitializerIndentWidth: 4
+ContinuationIndentWidth: 4
+Cpp11BracedListStyle: true
+DeriveLineEnding: true
+DerivePointerAlignment: true
+DisableFormat:   false
+ExperimentalAutoDetectBinPacking: false
+FixNamespaceComments: true
+ForEachMacros:
+  - foreach
+  - Q_FOREACH
+  - BOOST_FOREACH
+IncludeBlocks:   Regroup
+IncludeCategories:
+  - Regex:           '^<ext/.*\.h>'
+    Priority:        2
+    SortPriority:    0
+  - Regex:           '^<.*\.h>'
+    Priority:        1
+    SortPriority:    0
+  - Regex:           '^<.*'
+    Priority:        2
+    SortPriority:    0
+  - Regex:           '.*'
+    Priority:        3
+    SortPriority:    0
+IncludeIsMainRegex: '([-_](test|unittest))?$'
+IncludeIsMainSourceRegex: ''
+IndentCaseLabels: true
+IndentGotoLabels: true
+IndentPPDirectives: None
+IndentWidth:     2
+IndentWrappedFunctionNames: false
+JavaScriptQuotes: Leave
+JavaScriptWrapImports: true
+KeepEmptyLinesAtTheStartOfBlocks: false
+MacroBlockBegin: ''
+MacroBlockEnd:   ''
+MaxEmptyLinesToKeep: 1
+NamespaceIndentation: None
+ObjCBinPackProtocolList: Never
+ObjCBlockIndentWidth: 2
+ObjCSpaceAfterProperty: false
+ObjCSpaceBeforeProtocolList: true
+PenaltyBreakAssignment: 2
+PenaltyBreakBeforeFirstCallParameter: 1
+PenaltyBreakComment: 300
+PenaltyBreakFirstLessLess: 120
+PenaltyBreakString: 1000
+PenaltyBreakTemplateDeclaration: 10
+PenaltyExcessCharacter: 1000000
+PenaltyReturnTypeOnItsOwnLine: 200
+PointerAlignment: Left
+RawStringFormats:
+  - Language:        Cpp
+    Delimiters:
+      - cc
+      - CC
+      - cpp
+      - Cpp
+      - CPP
+      - 'c++'
+      - 'C++'
+    CanonicalDelimiter: ''
+    BasedOnStyle:    google
+  - Language:        TextProto
+    Delimiters:
+      - pb
+      - PB
+      - proto
+      - PROTO
+    EnclosingFunctions:
+      - EqualsProto
+      - EquivToProto
+      - PARSE_PARTIAL_TEXT_PROTO
+      - PARSE_TEST_PROTO
+      - PARSE_TEXT_PROTO
+      - ParseTextOrDie
+      - ParseTextProtoOrDie
+    CanonicalDelimiter: ''
+    BasedOnStyle:    google
+ReflowComments:  true
+SortIncludes:    true
+SortUsingDeclarations: true
+SpaceAfterCStyleCast: false
+SpaceAfterLogicalNot: false
+SpaceAfterTemplateKeyword: true
+SpaceBeforeAssignmentOperators: true
+SpaceBeforeCpp11BracedList: false
+SpaceBeforeCtorInitializerColon: true
+SpaceBeforeInheritanceColon: true
+SpaceBeforeParens: ControlStatements
+SpaceBeforeRangeBasedForLoopColon: true
+SpaceInEmptyBlock: false
+SpaceInEmptyParentheses: false
+SpacesBeforeTrailingComments: 2
+SpacesInAngles:  false
+SpacesInConditionalStatement: false
+SpacesInContainerLiterals: true
+SpacesInCStyleCastParentheses: false
+SpacesInParentheses: false
+SpacesInSquareBrackets: false
+SpaceBeforeSquareBrackets: false
+Standard:        Auto
+StatementMacros:
+  - Q_UNUSED
+  - QT_REQUIRE_VERSION
+TabWidth:        8
+UseCRLF:         false
+UseTab:          Never
+...
+
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..a41ecad
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,46 @@
+# Prerequisites
+*.d
+
+# Compiled Object files
+*.slo
+*.lo
+*.o
+*.obj
+
+# Precompiled Headers
+*.gch
+*.pch
+
+# Compiled Dynamic libraries
+*.so
+*.dylib
+*.dll
+
+# Fortran module files
+*.mod
+*.smod
+
+# Compiled Static libraries
+*.lai
+*.la
+*.a
+*.lib
+
+# Executables
+*.exe
+*.out
+*.app
+
+CMakeLists.txt.user
+CMakeCache.txt
+CMakeFiles
+CMakeScripts
+Testing
+Makefile
+cmake_install.cmake
+install_manifest.txt
+compile_commands.json
+CTestTestfile.cmake
+_deps
+
+build/
\ No newline at end of file
diff --git a/Compile_ToolChains/00-makefile/invsqrt.cpp b/Compile_ToolChains/00-makefile/invsqrt.cpp
new file mode 100644
index 0000000..fdfb0fb
--- /dev/null
+++ b/Compile_ToolChains/00-makefile/invsqrt.cpp
@@ -0,0 +1,14 @@
+float Q_rsqrt(float number)
+{
+    long i;
+    float x2, y;
+    const float threehalfs = 1.5F;
+
+    x2 = number * 0.5F;
+    y = number;
+    i = *(long *)&y;           // evil floating point bit level hacking
+    i = 0x5f3759df - (i >> 1); // what the fuck?
+    y = *(float *)&i;
+    y = y * (threehalfs - (x2 * y * y)); // 1st iteration
+    return y;
+}
\ No newline at end of file
diff --git a/Compile_ToolChains/00-makefile/invsqrt.h b/Compile_ToolChains/00-makefile/invsqrt.h
new file mode 100644
index 0000000..862afd6
--- /dev/null
+++ b/Compile_ToolChains/00-makefile/invsqrt.h
@@ -0,0 +1,6 @@
+#ifndef INV_SQRT_H
+#define INV_SQRT_H
+
+float Q_rsqrt( float number );
+
+#endif // INV_SQRT_H
\ No newline at end of file
diff --git a/Compile_ToolChains/00-makefile/main.cpp b/Compile_ToolChains/00-makefile/main.cpp
new file mode 100644
index 0000000..4d37002
--- /dev/null
+++ b/Compile_ToolChains/00-makefile/main.cpp
@@ -0,0 +1,13 @@
+#include <iostream>
+#include "invsqrt.h"
+
+int main()
+{
+    float x;
+    while(1)
+    {
+        std::cout << "input a number(press Ctrl+C to exit):";
+        std::cin >> x;
+        std::cout << Q_rsqrt(x) << std::endl;
+    }
+}
\ No newline at end of file
diff --git a/Compile_ToolChains/00-makefile/makefile b/Compile_ToolChains/00-makefile/makefile
new file mode 100644
index 0000000..6846a96
--- /dev/null
+++ b/Compile_ToolChains/00-makefile/makefile
@@ -0,0 +1,14 @@
+CXXFLAGS = -std=c++17 -O2
+
+main: main.o invsqrt.o
+	$(CXX) $(CXXFLAGS) -o $@ $^  
+
+main.o: main.cpp invsqrt.h
+	$(CXX) $(CXXFLAGS) -o $@ -c $<
+
+invsqrt.o: invsqrt.cpp invsqrt.h
+	$(CXX) $(CXXFLAGS) -o $@ -c $<
+
+.PHONY: clean
+clean:
+	rm main.o invsqrt.o main
\ No newline at end of file
diff --git a/Compile_ToolChains/01-basic/CMakeLists.txt b/Compile_ToolChains/01-basic/CMakeLists.txt
new file mode 100644
index 0000000..deeb334
--- /dev/null
+++ b/Compile_ToolChains/01-basic/CMakeLists.txt
@@ -0,0 +1,10 @@
+# Set the minimum version of CMake that can be used
+# To find the cmake version run
+# $ cmake --version
+cmake_minimum_required(VERSION 3.5)
+
+# Set the project name
+project (hello_cmake)
+
+# Add an executable
+add_executable(hello main.cpp)
diff --git a/Compile_ToolChains/01-basic/main.cpp b/Compile_ToolChains/01-basic/main.cpp
new file mode 100644
index 0000000..ed7b11c
--- /dev/null
+++ b/Compile_ToolChains/01-basic/main.cpp
@@ -0,0 +1,6 @@
+#include <iostream>
+
+int main()
+{
+    std::cout << "hello world!" << std::endl;
+}
\ No newline at end of file
diff --git a/Compile_ToolChains/02-multifiles/CMakeLists.txt b/Compile_ToolChains/02-multifiles/CMakeLists.txt
new file mode 100644
index 0000000..b56858c
--- /dev/null
+++ b/Compile_ToolChains/02-multifiles/CMakeLists.txt
@@ -0,0 +1,12 @@
+# build part
+cmake_minimum_required(VERSION 3.5)
+project (invsqrt)
+set(SOURCES src/invsqrt.cpp src/main.cpp)
+add_executable(invsqrt ${SOURCES})
+target_include_directories(invsqrt PUBLIC ${PROJECT_SOURCE_DIR}/include)
+
+# debug part
+message("CMAKE_SOURCE_DIR: ${CMAKE_SOURCE_DIR}")
+message("PROJECT_SOURCE_DIR: ${PROJECT_SOURCE_DIR}")
+
+message("SOURCES: ${SOURCES}")
\ No newline at end of file
diff --git a/Compile_ToolChains/02-multifiles/include/invsqrt.h b/Compile_ToolChains/02-multifiles/include/invsqrt.h
new file mode 100644
index 0000000..862afd6
--- /dev/null
+++ b/Compile_ToolChains/02-multifiles/include/invsqrt.h
@@ -0,0 +1,6 @@
+#ifndef INV_SQRT_H
+#define INV_SQRT_H
+
+float Q_rsqrt( float number );
+
+#endif // INV_SQRT_H
\ No newline at end of file
diff --git a/Compile_ToolChains/02-multifiles/src/invsqrt.cpp b/Compile_ToolChains/02-multifiles/src/invsqrt.cpp
new file mode 100644
index 0000000..fdfb0fb
--- /dev/null
+++ b/Compile_ToolChains/02-multifiles/src/invsqrt.cpp
@@ -0,0 +1,14 @@
+float Q_rsqrt(float number)
+{
+    long i;
+    float x2, y;
+    const float threehalfs = 1.5F;
+
+    x2 = number * 0.5F;
+    y = number;
+    i = *(long *)&y;           // evil floating point bit level hacking
+    i = 0x5f3759df - (i >> 1); // what the fuck?
+    y = *(float *)&i;
+    y = y * (threehalfs - (x2 * y * y)); // 1st iteration
+    return y;
+}
\ No newline at end of file
diff --git a/Compile_ToolChains/02-multifiles/src/main.cpp b/Compile_ToolChains/02-multifiles/src/main.cpp
new file mode 100644
index 0000000..d8eda90
--- /dev/null
+++ b/Compile_ToolChains/02-multifiles/src/main.cpp
@@ -0,0 +1,13 @@
+#include <iostream>
+#include "../include/invsqrt.h"
+
+int main()
+{
+    float x;
+    while(1)
+    {
+        std::cout << "input a number(press Ctrl+C to exit):";
+        std::cin >> x;
+        std::cout << Q_rsqrt(x) << std::endl;
+    }
+}
\ No newline at end of file
diff --git a/Compile_ToolChains/03-static-libraries/CMakeLists.txt b/Compile_ToolChains/03-static-libraries/CMakeLists.txt
new file mode 100644
index 0000000..b1d7d66
--- /dev/null
+++ b/Compile_ToolChains/03-static-libraries/CMakeLists.txt
@@ -0,0 +1,10 @@
+cmake_minimum_required(VERSION 3.5)
+project(invsqrt)
+
+# create static library
+add_library(invsqrt_static STATIC src/invsqrt.cpp)
+target_include_directories(invsqrt_static PUBLIC ${PROJECT_SOURCE_DIR}/include)
+
+# create executable
+add_executable(invsqrt src/main.cpp)
+target_link_libraries(invsqrt PRIVATE invsqrt_static)
diff --git a/Compile_ToolChains/03-static-libraries/include/invsqrt.h b/Compile_ToolChains/03-static-libraries/include/invsqrt.h
new file mode 100644
index 0000000..862afd6
--- /dev/null
+++ b/Compile_ToolChains/03-static-libraries/include/invsqrt.h
@@ -0,0 +1,6 @@
+#ifndef INV_SQRT_H
+#define INV_SQRT_H
+
+float Q_rsqrt( float number );
+
+#endif // INV_SQRT_H
\ No newline at end of file
diff --git a/Compile_ToolChains/03-static-libraries/src/invsqrt.cpp b/Compile_ToolChains/03-static-libraries/src/invsqrt.cpp
new file mode 100644
index 0000000..7c25f7d
--- /dev/null
+++ b/Compile_ToolChains/03-static-libraries/src/invsqrt.cpp
@@ -0,0 +1,16 @@
+#include "../include/invsqrt.h"
+
+float Q_rsqrt(float number)
+{
+    long i;
+    float x2, y;
+    const float threehalfs = 1.5F;
+
+    x2 = number * 0.5F;
+    y = number;
+    i = *(long *)&y;           // evil floating point bit level hacking
+    i = 0x5f3759df - (i >> 1); // what the fuck?
+    y = *(float *)&i;
+    y = y * (threehalfs - (x2 * y * y)); // 1st iteration
+    return y;
+}
\ No newline at end of file
diff --git a/Compile_ToolChains/03-static-libraries/src/main.cpp b/Compile_ToolChains/03-static-libraries/src/main.cpp
new file mode 100644
index 0000000..d8eda90
--- /dev/null
+++ b/Compile_ToolChains/03-static-libraries/src/main.cpp
@@ -0,0 +1,13 @@
+#include <iostream>
+#include "../include/invsqrt.h"
+
+int main()
+{
+    float x;
+    while(1)
+    {
+        std::cout << "input a number(press Ctrl+C to exit):";
+        std::cin >> x;
+        std::cout << Q_rsqrt(x) << std::endl;
+    }
+}
\ No newline at end of file
diff --git a/Compile_ToolChains/04-shared-libraries/CMakeLists.txt b/Compile_ToolChains/04-shared-libraries/CMakeLists.txt
new file mode 100644
index 0000000..d98a05b
--- /dev/null
+++ b/Compile_ToolChains/04-shared-libraries/CMakeLists.txt
@@ -0,0 +1,10 @@
+cmake_minimum_required(VERSION 3.5)
+project(invsqrt)
+
+# create shared library
+add_library(invsqrt_shared SHARED src/invsqrt.cpp)
+target_include_directories(invsqrt_shared PUBLIC ${PROJECT_SOURCE_DIR}/include)
+
+# create executable
+add_executable(invsqrt src/main.cpp)
+target_link_libraries(invsqrt PRIVATE invsqrt_shared)
diff --git a/Compile_ToolChains/04-shared-libraries/include/invsqrt.h b/Compile_ToolChains/04-shared-libraries/include/invsqrt.h
new file mode 100644
index 0000000..862afd6
--- /dev/null
+++ b/Compile_ToolChains/04-shared-libraries/include/invsqrt.h
@@ -0,0 +1,6 @@
+#ifndef INV_SQRT_H
+#define INV_SQRT_H
+
+float Q_rsqrt( float number );
+
+#endif // INV_SQRT_H
\ No newline at end of file
diff --git a/Compile_ToolChains/04-shared-libraries/src/invsqrt.cpp b/Compile_ToolChains/04-shared-libraries/src/invsqrt.cpp
new file mode 100644
index 0000000..7c25f7d
--- /dev/null
+++ b/Compile_ToolChains/04-shared-libraries/src/invsqrt.cpp
@@ -0,0 +1,16 @@
+#include "../include/invsqrt.h"
+
+float Q_rsqrt(float number)
+{
+    long i;
+    float x2, y;
+    const float threehalfs = 1.5F;
+
+    x2 = number * 0.5F;
+    y = number;
+    i = *(long *)&y;           // evil floating point bit level hacking
+    i = 0x5f3759df - (i >> 1); // what the fuck?
+    y = *(float *)&i;
+    y = y * (threehalfs - (x2 * y * y)); // 1st iteration
+    return y;
+}
\ No newline at end of file
diff --git a/Compile_ToolChains/04-shared-libraries/src/main.cpp b/Compile_ToolChains/04-shared-libraries/src/main.cpp
new file mode 100644
index 0000000..d8eda90
--- /dev/null
+++ b/Compile_ToolChains/04-shared-libraries/src/main.cpp
@@ -0,0 +1,13 @@
+#include <iostream>
+#include "../include/invsqrt.h"
+
+int main()
+{
+    float x;
+    while(1)
+    {
+        std::cout << "input a number(press Ctrl+C to exit):";
+        std::cin >> x;
+        std::cout << Q_rsqrt(x) << std::endl;
+    }
+}
\ No newline at end of file
diff --git a/Compile_ToolChains/05-third-party/CMakeLists.txt b/Compile_ToolChains/05-third-party/CMakeLists.txt
new file mode 100644
index 0000000..193ddb4
--- /dev/null
+++ b/Compile_ToolChains/05-third-party/CMakeLists.txt
@@ -0,0 +1,14 @@
+cmake_minimum_required(VERSION 2.6)
+
+project(cmake_with_gtest)
+
+set(SOURCES src/mysqrt.cpp src/main.cpp)
+
+find_package(GTest)
+message("GTEST_LIBRARIES: ${GTEST_LIBRARIES}")
+message("GTEST_INCLUDE_DIRS: ${GTEST_INCLUDE_DIRS}")
+
+include_directories(${GTEST_INCLUDE_DIRS} ${PROJECT_SOURCE_DIR}/include)
+
+add_executable(cmake_with_gtest ${SOURCES})
+target_link_libraries(cmake_with_gtest ${GTEST_LIBRARIES} pthread)
\ No newline at end of file
diff --git a/Compile_ToolChains/05-third-party/include/mysqrt.h b/Compile_ToolChains/05-third-party/include/mysqrt.h
new file mode 100644
index 0000000..ab263da
--- /dev/null
+++ b/Compile_ToolChains/05-third-party/include/mysqrt.h
@@ -0,0 +1,6 @@
+#ifndef MYSQRT_H
+#define MYSQRT_H
+
+double mysqrt(double x); 
+
+#endif // SQRT_H
\ No newline at end of file
diff --git a/Compile_ToolChains/05-third-party/src/main.cpp b/Compile_ToolChains/05-third-party/src/main.cpp
new file mode 100644
index 0000000..8c9ba5e
--- /dev/null
+++ b/Compile_ToolChains/05-third-party/src/main.cpp
@@ -0,0 +1,22 @@
+#include <gtest/gtest.h>
+#include "../include/mysqrt.h"
+
+TEST(mysqrtTest, PositiveNos)
+{
+    ASSERT_EQ(6, mysqrt(36.0));
+    ASSERT_EQ(18.0, mysqrt(324.0));
+    ASSERT_EQ(25.4, mysqrt(645.16));
+    ASSERT_EQ(0, mysqrt(0.0));
+}
+
+TEST(mysqrtTest, NegativeNos)
+{
+    ASSERT_EQ(-1.0, mysqrt(-15.0));
+    ASSERT_EQ(-1.0, mysqrt(-0.2));
+}
+
+int main(int argc, char **argv)
+{
+    testing::InitGoogleTest(&argc, argv);
+    return RUN_ALL_TESTS();
+}
\ No newline at end of file
diff --git a/Compile_ToolChains/05-third-party/src/mysqrt.cpp b/Compile_ToolChains/05-third-party/src/mysqrt.cpp
new file mode 100644
index 0000000..37eea09
--- /dev/null
+++ b/Compile_ToolChains/05-third-party/src/mysqrt.cpp
@@ -0,0 +1,15 @@
+#include <math.h>
+#include "../include/mysqrt.h"
+
+double mysqrt(double x)
+{
+    double b = sqrt(x);
+    if (b != b) // NaN check
+    {
+        return -1.0;
+    }
+    else
+    {
+        return sqrt(x);
+    }
+}
\ No newline at end of file
diff --git a/Compile_ToolChains/README.md b/Compile_ToolChains/README.md
new file mode 100644
index 0000000..c845312
--- /dev/null
+++ b/Compile_ToolChains/README.md
@@ -0,0 +1,292 @@
+# Makefile & CMake
+
+想象一下我们有如下C++程序`hello.cpp`：
+
+```cpp
+#include <iostream>
+int main()
+{
+    std::cout << "hello world!" << std::endl;
+}
+```
+
+我们需要在终端输入以下指令：
+
+```bash
+$ g++ hello.cpp -o hello 
+```
+
+这时我们就可以生成可执行文件`hello`。但在实际应用场景中，我们可能会面临如下问题：
+
+* 项目中的`.h`文件和`.cpp`文件十分繁多。
+* 各`.h`文件、`.cpp`文件的依赖关系十分复杂。
+* 多文件可能会出现重复编译的情况，拖慢编译速度。
+* ...
+
+为了解决这些问题，`makefile`和`CMake`应运而生。
+
+本讲需要使用到的工具：`g++`，`make`，`cmake`。可以通过以下方式安装：
+
+```bash
+$ sudo apt-get install g++ make cmake
+```
+
+## Makefile
+
+makefile文件描述了C/C++工程的编译规则，可以用来指明源文件的编译顺序、依赖关系、是否需要重新编译等，自动化编译C/C++项目（实际上也不止局限于C/C++项目）。
+
+我们可以考虑以下实例：
+
+```
+.
+├── invsqrt.cpp
+├── invsqrt.h
+├── main.cpp
+└── makefile
+```
+
+makefile如下：
+
+```makefile
+CXXFLAGS = -std=c++17 -O2
+
+main: main.o invsqrt.o
+	$(CXX) $(CXXFLAGS) -o $@ $^  
+
+main.o: main.cpp invsqrt.h
+	$(CXX) $(CXXFLAGS) -o $@ -c $<
+
+invsqrt.o: invsqrt.cpp invsqrt.h
+	$(CXX) $(CXXFLAGS) -o $@ -c $<
+
+.PHONY: clean
+clean:
+	rm main.o invsqrt.o main
+```
+
+我们不需要理解每一段代码的具体含义（之后我们可以看到，我们不需要手动编写makefile，而可以直接通过CMake工具生成makefile），我们只需要了解如何使用makefile：
+* 在makefile的同目录下输入`make`，就可以按照makefile所指定的编译规则自动编译整个工程。
+* 在makefile的同目录下输入`make clean`，可以删除编译生成的中间文件和可执行文件。
+* 除此之外，你还可以为makefile添加更多指令，此处由于篇幅所限，不再展开介绍。
+
+## CMake
+
+makefile存在以下问题：
+* 语法复杂，代码可读性差，难以维护。
+* 跨平台性差。
+  
+在目前的C++工程中，我们多使用CMake来管理项目。
+
+什么是[CMake](https://cmake.org/)？CMake是一种跨平台的编译工具，可以用较为简洁易读的语法描述C++项目的编译、链接、安装过程等，在现代C++项目上得到了广泛应用。
+
+
+### 1 第一个CMake项目
+
+CMake的项目文件叫做`CMakeLists.txt`。其放置位置如下图所示：
+```
+├── CMakeLists.txt
+└── main.cpp
+```
+
+该项目的`CMakeLists.txt`中需要添加以下内容：
+```cmake
+cmake_minimum_required(VERSION 3.5)
+project (hello_world)
+add_executable(hello_world main.cpp)
+```
+
+> **语法总结1**
+> * `cmake_minimum_required(VERSION 3.5)` CMake需要的最小版本。CMake的版本可以在命令行中输入`cmake --version`获取，一般无强制要求。 
+> * `project(<project_name>)` 指定工程名称。
+> * `add_executable(<executable_name> <cppfile_name>)` 生成可执行文件。
+
+cmake工具的使用一般分为两步 1) 使用`CMakeLists.txt`生成`makefile`。 2) 使用`makefile`自动化编译项目。
+
+1. 输入`cmake CMakeLists.txt`，目录下将会生成一个`Makefile`文件。
+2. 输入`make`，即可将源代码编译生成可执行文件。此处将会在与`CMakeLists.txt`相同目录的位置生成一个可执行文件`hello_word`，输入`./hello_word`即可运行该可执行文件。
+3. 此外，输入`make help`，你也可以查看使用当前的`Makefile`所能执行的所有指令，例如`make clean`（清楚生成的可执行文件和中间文件）。
+
+### 2 多文件
+
+在平时的程设小作业中，我们习惯将所有的代码都写在一个`.cpp`文件中。但在实际工程中，为了方便代码复用和运行维护，通常将所有的文件划分为头文件(`.h`)，模块文件(`.cpp`)和主程序文件(`.cpp`)。
+
+在本节中，我们将在头文件中声明一个计算平方根倒数的函数，在模块文件中实现其主体，然后在主函数中调用它。项目结构如下：
+
+```
+.
+├── CMakeLists.txt
+├── include
+│   └── invsqrt.h
+└── src
+    ├── invsqrt.cpp
+    └── main.cpp
+```
+
+> tips: 在C++工程中，我们通常在`include/`目录下放置头文件，在`src/`目录下放置源文件。
+
+该项目的`CMakeLists.txt`中需要添加以下内容：
+```cmake
+# build part
+cmake_minimum_required(VERSION 3.5)
+project(invsqrt)
+set(SOURCES src/invsqrt.cpp src/main.cpp)
+add_executable(invsqrt ${SOURCES})
+target_include_directories(invsqrt PUBLIC ${PROJECT_SOURCE_DIR}/include)
+
+# debug part
+message("CMAKE_SOURCE_DIR: ${CMAKE_SOURCE_DIR}")
+message("PROJECT_SOURCE_DIR: ${PROJECT_SOURCE_DIR}")
+
+message("SOURCES: ${SOURCES}")
+```
+
+> **语法总结2**
+> * `set(<variable> <value>)` 设置变量 
+> * `target_include_directories(<project_name> <INTERFACE|PUBLIC|PRIVATE> <headfile_directory>)` 指定所要包含的头文件。
+> * `message("your message")` 在终端打印信息。
+
+这里需要特别说明一下CMake中的变量使用。CMake中的变量分为两种：
+
+* 显式变量：使用`set`指令定义的变量。
+* 隐式变量：通过其它指令隐式生成的变量。如该项目中会隐式生成`PROJECT_SOURCE_DIR`变量，默认为`CMakeLists.txt`所在的文件夹。
+
+CMake中有丰富的变量，用于定义工程目录、编译选项等，此处不做过多展开。想要了解更多，可以参考文末列出的参考文档。
+
+### 3 静态库和动态库
+
+有些时候，出于方便复用、防止源码泄露等原因，我们需要将代码封装为静态库和动态库。CMake同样提供了生成静态库和动态库的功能。
+
+#### 3.1 静态库
+
+在此处，我们将上一小节中计算平方根倒数的程序封装为静态库。项目结构如下：
+```
+.
+├── CMakeLists.txt
+├── include
+│   └── invsqrt.h
+└── src
+    ├── invsqrt.cpp
+    └── main.cpp
+```
+
+该项目的`CMakeLists.txt`中需要添加以下内容：
+```cmake
+cmake_minimum_required(VERSION 3.5)
+project(invsqrt)
+
+# create static library
+add_library(invsqrt_static STATIC src/invsqrt.cpp)
+target_include_directories(invsqrt_static PUBLIC ${PROJECT_SOURCE_DIR}/include)
+
+# create executable
+add_executable(invsqrt src/main.cpp)
+target_link_libraries(invsqrt PRIVATE invsqrt_static)
+```
+
+> **语法总结3**
+> * `add_library(<library_name> STATIC <cppfile_name>)` 生成静态库 
+> * `target_link_libraries(<executable> <INTERFACE|PUBLIC|PRIVATE> <library_name>)` 指定所要链接的库。
+
+此处我们使用一种更为优雅的生成方式——我们期望将生成的静态库、可执行文件输出到`build`文件夹里，而不是和主项目混杂在一起。为此我们需要输入以下指令：
+
+```bash
+$ mkdir build
+$ cd build
+$ cmake .. # 使用的是上一层目录的CMakeLists.txt，因此需要输入'..'
+$ make
+```
+
+我们将会在`build/`目录下看到静态库`libinvsqrt_static.a`和可执行文件`invsqrt`。
+
+#### 3.2 动态库
+
+项目目录结构同静态库一节。
+
+该项目的`CMakeLists.txt`中需要添加以下内容：
+```cmake
+cmake_minimum_required(VERSION 3.5)
+project(invsqrt)
+
+# create shared library
+add_library(invsqrt_shared SHARED src/invsqrt.cpp)
+target_include_directories(invsqrt_shared PUBLIC ${PROJECT_SOURCE_DIR}/include)
+
+# create executable
+add_executable(invsqrt src/main.cpp)
+target_link_libraries(invsqrt PRIVATE invsqrt_shared)
+
+```
+
+> **语法总结4**
+> * `add_library(<library_name> SHARED <cppfile_name>)` 生成动态库 
+
+同样按照上小节的方法生成项目。我们将会在`build/`目录下看到动态库`libinvsqrt_shared.so`和可执行文件`invsqrt`。
+
+### 4 使用第三方库
+
+在实际的C++工程中，我们可能需要链接一些开源的第三方库。CMake也提供了相关的配置方式。我们以谷歌开发的单元测试框架`googletest`为例：
+
+> googletest的安装方法：
+> ```bash
+> $ git clone https://github.com/google/googletest.git
+> # or git clone git@github.com:google/googletest.git
+> $ cd googletest
+> $ mkdir build 
+> $ cd build
+> $ cmake ../
+> $ make -j all
+> $ make install 
+> # or sudo make install
+> ```
+
+> 在默认情况下，与该第三方库相关的头文件将会被放置在`/usr/local/include`目录下，与该第三方库相关的库文件将会被放置在`/usr/local/lib`目录下，与该第三方库相关的可执行文件将会被放置在`/usr/local/bin`目录下。
+
+项目结构如下：
+
+```
+.
+├── CMakeLists.txt
+├── include
+│   └── mysqrt.h
+└── src
+    ├── mysqrt.cpp
+    └── main.cpp
+```
+
+```cmake
+cmake_minimum_required(VERSION 2.6)
+
+project(cmake_with_gtest)
+
+set(SOURCES src/mysqrt.cpp src/main.cpp)
+
+find_package(GTest)
+message("GTEST_LIBRARIES: ${GTEST_LIBRARIES}")
+message("GTEST_INCLUDE_DIRS: ${GTEST_INCLUDE_DIRS}")
+
+include_directories(${GTEST_INCLUDE_DIRS} ${PROJECT_SOURCE_DIR}/include)
+
+add_executable(cmake_with_gtest ${SOURCES})
+target_link_libraries(cmake_with_gtest ${GTEST_LIBRARIES} pthread)
+```
+
+> **语法总结5**
+> * `find_package(<package_name>)` 查询第三方库的位置。若查找成功，则初始化变量`<package_name>_INCLUDE_DIR`（第三方库的头文件目录）以及`<package_name>_LIBRARIES`（第三方库的静态/动态库目录）。 
+
+CMake支持的所有第三方库可以在[https://cmake.org/cmake/help/latest/manual/cmake-modules.7.html](https://cmake.org/cmake/help/latest/manual/cmake-modules.7.html)中找到。
+
+## 写在最后
+
+CMake还有很多强大的功能：
+
+* 设置C++工程的语言标准、编译优化选项。
+* 层级文件之间`CMakeLists.txt`的相互调用，以便应用于目录层级更加复杂的C++工程。
+* 对生成的库、可执行文件等进行安装。
+* ...
+
+略过上述内容不会对我们的教学产生太大影响。感兴趣的同学可以参考以下文章：
+
+* [CMake官方文档](https://cmake.org/documentation/)
+* [cmake-examples](https://github.com/ttroy50/cmake-examples) 该GitHub仓库中有很多开箱即用的CMake实例。
+* [为什么编译c/c++要用makefile，而不是直接用shell呢？](https://www.zhihu.com/question/461953861/answer/1914452432) 这篇博文详细地阐述了使用makefile的动机和意义（\xfgg/）。
+* [跟我一起写Makefile](https://seisman.github.io/how-to-write-makefile/introduction.html) Makefile教程。从中大家也可以看出Makefile的语法十分不友好...