Tutorial: Refactor MakeTable commands into MakeTable.cmake

Help/guide/tutorial/Adding Generator Expressions.rst

@@ -105,7 +105,7 @@ The specific lines to remove are as follows:
   :name: CMakeLists.txt-CXX_STANDARD-variable-remove
   :language: cmake
   :start-after: # specify the C++ standard
-  :end-before: # TODO 5: Create helper variables
+  :end-before: # TODO 6: Create helper variables
 
 Next, we need to create an interface library, ``tutorial_compiler_flags``. And
 then use :command:`target_compile_features` to add the compiler feature
@@ -128,7 +128,8 @@ then use :command:`target_compile_features` to add the compiler feature
   </details>
 
 Finally, with our interface library set up, we need to link our
-executable ``Target`` and our ``MathFunctions`` library to our new
+executable ``Target``, our ``MathFunctions`` library, and our ``SqrtLibrary``
+library to our new
 ``tutorial_compiler_flags`` library. Respectively, the code will look like
 this:
 
@@ -147,7 +148,7 @@ this:
 
   </details>
 
-and this:
+this:
 
 .. raw:: html
 
@@ -158,12 +159,30 @@ and this:
   :name: MathFunctions-CMakeLists.txt-target_link_libraries-step4
   :language: cmake
   :start-after: # link our compiler flags interface library
-  :end-before: # TODO 1
+  :end-before: target_link_libraries(MathFunctions
 
 .. raw:: html
 
   </details>
 
+and this:
+
+.. raw:: html
+
+  <details><summary>TODO 4: Click to show/hide answer</summary>
+
+.. literalinclude:: Step5/MathFunctions/CMakeLists.txt
+  :caption: TODO 4: MathFunctions/CMakeLists.txt
+  :name: MathFunctions-SqrtLibrary-target_link_libraries-step4
+  :language: cmake
+  :start-after: target_link_libraries(SqrtLibrary
+  :end-before: endif()
+
+.. raw:: html
+
+  </details>
+
+
 With this, all of our code still requires C++ 11 to build. Notice
 though that with this method, it gives us the ability to be specific about
 which targets get specific requirements. In addition, we create a single
@@ -199,8 +218,8 @@ Files to Edit
 Getting Started
 ---------------
 
-Start with the resulting files from Exercise 1. Complete ``TODO 4`` through
-``TODO 7``.
+Start with the resulting files from Exercise 1. Complete ``TODO 5`` through
+``TODO 8``.
 
 First, in the top level ``CMakeLists.txt`` file, we need to set the
 :command:`cmake_minimum_required` to ``3.15``. In this exercise we are going
@@ -230,10 +249,10 @@ version ``3.15``:
 
 .. raw:: html
 
-  <details><summary>TODO 4: Click to show/hide answer</summary>
+  <details><summary>TODO 5: Click to show/hide answer</summary>
 
 .. literalinclude:: Step5/CMakeLists.txt
-  :caption: TODO 4: CMakeLists.txt
+  :caption: TODO 5: CMakeLists.txt
   :name: MathFunctions-CMakeLists.txt-minimum-required-step4
   :language: cmake
   :end-before: # set the project name and version
@@ -249,10 +268,10 @@ variables ``gcc_like_cxx`` and ``msvc_cxx`` as follows:
 
 .. raw:: html
 
-  <details><summary>TODO 5: Click to show/hide answer</summary>
+  <details><summary>TODO 6: Click to show/hide answer</summary>
 
 .. literalinclude:: Step5/CMakeLists.txt
-  :caption: TODO 5: CMakeLists.txt
+  :caption: TODO 6: CMakeLists.txt
   :name: CMakeLists.txt-compile_lang_and_id
   :language: cmake
   :start-after: # the BUILD_INTERFACE genex
@@ -270,10 +289,10 @@ interface library.
 
 .. raw:: html
 
-  <details><summary>TODO 6: Click to show/hide answer</summary>
+  <details><summary>TODO 7: Click to show/hide answer</summary>
 
 .. code-block:: cmake
-  :caption: TODO 6: CMakeLists.txt
+  :caption: TODO 7: CMakeLists.txt
   :name: CMakeLists.txt-compile_flags
 
   target_compile_options(tutorial_compiler_flags INTERFACE
@@ -292,10 +311,10 @@ condition. The resulting full code looks like the following:
 
 .. raw:: html
 
-  <details><summary>TODO 7: Click to show/hide answer</summary>
+  <details><summary>TODO 8: Click to show/hide answer</summary>
 
 .. literalinclude:: Step5/CMakeLists.txt
-  :caption: TODO 7: CMakeLists.txt
+  :caption: TODO 8: CMakeLists.txt
   :name: CMakeLists.txt-target_compile_options-genex
   :language: cmake
   :start-after: set(msvc_cxx "$<COMPILE_LANG_AND_ID:CXX,MSVC>")

Help/guide/tutorial/Adding a Custom Command and Generated File.rst

@@ -18,17 +18,16 @@ In the ``MathFunctions`` subdirectory, a new source file named
 After reviewing the file, we can see that the table is produced as valid C++
 code and that the output filename is passed in as an argument.
 
-The next step is to add the appropriate commands to the
-``MathFunctions/CMakeLists.txt`` file to build the MakeTable executable and
+The next step is to create ``MathFunctions/MakeTable.cmake``. Then, add the
+appropriate commands to the file to build the ``MakeTable`` executable and
 then run it as part of the build process. A few commands are needed to
 accomplish this.
 
-First, in the ``USE_MYMATH`` section of ``MathFunctions/CMakeLists.txt``,
-we add an executable for ``MakeTable``.
+First, we add an executable for ``MakeTable``.
 
-.. literalinclude:: Step9/MathFunctions/CMakeLists.txt
-  :caption: MathFunctions/CMakeLists.txt
-  :name: MathFunctions/CMakeLists.txt-add_executable-MakeTable
+.. literalinclude:: Step9/MathFunctions/MakeTable.cmake
+  :caption: MathFunctions/MakeTable.cmake
+  :name: MathFunctions/MakeTable.cmake-add_executable-MakeTable
   :language: cmake
   :start-after: # first we add the executable that generates the table
   :end-before: target_link_libraries
@@ -36,9 +35,9 @@ we add an executable for ``MakeTable``.
 After creating the executable, we add the ``tutorial_compiler_flags`` to our
 executable using :command:`target_link_libraries`.
 
-.. literalinclude:: Step9/MathFunctions/CMakeLists.txt
-  :caption: MathFunctions/CMakeLists.txt
-  :name: MathFunctions/CMakeLists.txt-link-tutorial-compiler-flags
+.. literalinclude:: Step9/MathFunctions/MakeTable.cmake
+  :caption: MathFunctions/MakeTable.cmake
+  :name: MathFunctions/MakeTable.cmake-link-tutorial-compiler-flags
   :language: cmake
   :start-after: add_executable
   :end-before: # add the command to generate
@@ -46,16 +45,15 @@ executable using :command:`target_link_libraries`.
 Then we add a custom command that specifies how to produce ``Table.h``
 by running MakeTable.
 
-.. literalinclude:: Step9/MathFunctions/CMakeLists.txt
-  :caption: MathFunctions/CMakeLists.txt
-  :name: MathFunctions/CMakeLists.txt-add_custom_command-Table.h
+.. literalinclude:: Step9/MathFunctions/MakeTable.cmake
+  :caption: MathFunctions/MakeTable.cmake
+  :name: MathFunctions/MakeTable.cmake-add_custom_command-Table.h
   :language: cmake
   :start-after: # add the command to generate the source code
-  :end-before: # library that just does sqrt
 
 Next we have to let CMake know that ``mysqrt.cxx`` depends on the generated
 file ``Table.h``. This is done by adding the generated ``Table.h`` to the list
-of sources for the library MathFunctions.
+of sources for the library ``SqrtLibrary``.
 
 .. literalinclude:: Step9/MathFunctions/CMakeLists.txt
   :caption: MathFunctions/CMakeLists.txt
@@ -74,17 +72,15 @@ directories so that ``Table.h`` can be found and included by ``mysqrt.cxx``.
   :start-after: # state that we depend on our bin
   :end-before: target_link_libraries
 
-As the last thing in our ``USE_MYMATH`` section, we need to link the our
-flags onto ``SqrtLibrary`` and then link ``SqrtLibrary`` onto
-``MathFunctions``. This makes the resulting ``USE_MYMATH`` section look like
-the following:
+As the last step, we need to include
+``MakeTable.cmake`` at the top of the ``MathFunctions/CMakeLists.txt``.
 
 .. literalinclude:: Step9/MathFunctions/CMakeLists.txt
   :caption: MathFunctions/CMakeLists.txt
-  :name: MathFunctions/CMakeLists.txt-full_USE_MYMATH-section
+  :name: MathFunctions/CMakeLists.txt-include-MakeTable.cmake
   :language: cmake
-  :start-after: if (USE_MYMATH)
-  :end-before: endif()
+  :start-after: # generate Table.h
+  :end-before: # library that just does sqrt
 
 Now let's use the generated table. First, modify ``mysqrt.cxx`` to include
 ``Table.h``. Next, we can rewrite the ``mysqrt`` function to use the table:

Help/guide/tutorial/Adding a Library.rst

@@ -100,11 +100,11 @@ source files for the library are passed as an argument to
 
   <details><summary>TODO 1: Click to show/hide answer</summary>
 
-.. literalinclude:: Step3/MathFunctions/CMakeLists.txt
+.. code-block:: cmake
   :caption: TODO 1: MathFunctions/CMakeLists.txt
   :name: MathFunctions/CMakeLists.txt-add_library
-  :language: cmake
-  :end-before: # TODO 1
+
+  add_library(MathFunctions MathFunctions.cxx mysqrt.cxx)
 
 .. raw:: html
 
@@ -191,7 +191,7 @@ Lastly, replace ``sqrt`` with our library function ``mathfunctions::mysqrt``.
   <details><summary>TODO 6: Click to show/hide answer</summary>
 
 .. literalinclude:: Step3/tutorial.cxx
-  :caption: TODO 7: tutorial.cxx
+  :caption: TODO 6: tutorial.cxx
   :name: CMakeLists.txt-option
   :language: cmake
   :start-after:   const double inputValue = std::stod(argv[1]);
@@ -238,7 +238,7 @@ Getting Started
 ---------------
 
 Start with the resulting files from Exercise 1. Complete ``TODO 7`` through
-``TODO 9``.
+``TODO 14``.
 
 First create a variable ``USE_MYMATH`` using the :command:`option` command
 in ``MathFunctions/CMakeLists.txt``. In that same file, use that option
@@ -247,6 +247,10 @@ to pass a compile definition to the ``MathFunctions`` library.
 Then, update ``MathFunctions.cxx`` to redirect compilation based on
 ``USE_MYMATH``.
 
+Lastly, prevent ``mysqrt.cxx`` from being compiled when ``USE_MYMATH`` is on
+by making it its own library inside of the ``USE_MYMATH`` block of
+``MathFunctions/CMakeLists.txt``.
+
 Build and Run
 -------------
 
@@ -315,16 +319,22 @@ definition ``USE_MYMATH``.
 
   <details><summary>TODO 8: Click to show/hide answer</summary>
 
-.. literalinclude:: Step3/MathFunctions/CMakeLists.txt
+.. code-block:: cmake
   :caption: TODO 8: MathFunctions/CMakeLists.txt
   :name: CMakeLists.txt-USE_MYMATH
-  :language: cmake
-  :start-after: USE_MYMATH "Use tutorial provided math implementation" ON)
+
+  if (USE_MYMATH)
+    target_compile_definitions(MathFunctions PRIVATE "USE_MYMATH")
+  endif()
 
 .. raw:: html
 
   </details>
 
+When ``USE_MYMATH`` is ``ON``, the compile definition ``USE_MYMATH`` will
+be set. We can then use this compile definition to enable or disable
+sections of our source code.
+
 The corresponding changes to the source code are fairly straightforward.
 In ``MathFunctions.cxx``, we make ``USE_MYMATH`` control which square root
 function is used:
@@ -377,10 +387,68 @@ Finally, we need to include ``cmath`` now that we are using ``std::sqrt``.
 
   </details>
 
-When ``USE_MYMATH`` is ``ON``, the compile definition ``USE_MYMATH`` will
-be set. We can then use this compile definition to enable or disable
-sections of our source code. With this strategy, we allow users to
-toggle ``USE_MYMATH`` to manipulate what library is used in the build.
+At this point, if ``USE_MYMATH`` is ``OFF``, ``mysqrt.cxx`` would not be used
+but it will still be compiled because the ``MathFunctions`` target has
+``mysqrt.cxx`` listed under sources.
+
+There are a few ways to fix this. The first option is to use
+:command:`target_sources` to add ``mysqrt.cxx`` from within the ``USE_MYMATH``
+block. Another option is to create an additional library within the
+``USE_MYMATH`` block which is responsible for compiling ``mysqrt.cxx``. For
+the sake of this tutorial, we are going to create an additional library.
+
+First, from within ``USE_MYMATH`` create a library called ``SqrtLibrary``
+that has sources ``mysqrt.cxx``.
+
+.. raw:: html
+
+  <details><summary>TODO 12: Click to show/hide answer</summary>
+
+.. literalinclude:: Step3/MathFunctions/CMakeLists.txt
+  :caption: TODO 12 : MathFunctions/CMakeLists.txt
+  :name: MathFunctions/CMakeLists.txt-add_library-SqrtLibrary
+  :language: cmake
+  :start-after: # library that just does sqrt
+  :end-before: target_link_libraries(MathFunctions
+
+.. raw:: html
+
+  </details>
+
+Next, we link ``SqrtLibrary`` onto ``MathFunctions`` when ``USE_MYMATH`` is
+enabled.
+
+.. raw:: html
+
+  <details><summary>TODO 13: Click to show/hide answer</summary>
+
+.. literalinclude:: Step3/MathFunctions/CMakeLists.txt
+  :caption: TODO 13 : MathFunctions/CMakeLists.txt
+  :name: MathFunctions/CMakeLists.txt-target_link_libraries-SqrtLibrary
+  :language: cmake
+  :lines: 16-18
+
+.. raw:: html
+
+  </details>
+
+Finally, we can remove ``mysqrt.cxx`` from our ``MathFunctions`` library
+source list because it will be pulled in when ``SqrtLibrary`` is included.
+
+.. raw:: html
+
+  <details><summary>TODO 14: Click to show/hide answer</summary>
+
+.. literalinclude:: Step3/MathFunctions/CMakeLists.txt
+  :caption: TODO 14 : MathFunctions/CMakeLists.txt
+  :name: MathFunctions/CMakeLists.txt-remove-mysqrt.cxx-MathFunctions
+  :language: cmake
+  :end-before: # TODO 1:
+
+.. raw:: html
+
+  </details>
 
 With these changes, the ``mysqrt`` function is now completely optional to
-whoever is building and using the ``MathFunctions`` library.
+whoever is building and using the ``MathFunctions`` library. Users can toggle
+``USE_MYMATH`` to manipulate what library is used in the build.

Help/guide/tutorial/Complete/MathFunctions/CMakeLists.txt

@@ -15,16 +15,7 @@ if(USE_MYMATH)
 
   target_compile_definitions(MathFunctions PRIVATE "USE_MYMATH")
 
-  # first we add the executable that generates the table
-  add_executable(MakeTable MakeTable.cxx)
-  target_link_libraries(MakeTable PRIVATE tutorial_compiler_flags)
-
-  # add the command to generate the source code
-  add_custom_command(
-    OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/Table.h
-    COMMAND MakeTable ${CMAKE_CURRENT_BINARY_DIR}/Table.h
-    DEPENDS MakeTable
-    )
+  include(MakeTable.cmake) # generates Table.h
 
   # library that just does sqrt
   add_library(SqrtLibrary STATIC

Help/guide/tutorial/Complete/MathFunctions/MakeTable.cmake

@@ -0,0 +1,10 @@
+# first we add the executable that generates the table
+add_executable(MakeTable MakeTable.cxx)
+target_link_libraries(MakeTable PRIVATE tutorial_compiler_flags)
+
+# add the command to generate the source code
+add_custom_command(
+  OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/Table.h
+  COMMAND MakeTable ${CMAKE_CURRENT_BINARY_DIR}/Table.h
+  DEPENDS MakeTable
+  )

Help/guide/tutorial/Step10/MathFunctions/CMakeLists.txt

@@ -13,16 +13,7 @@ if(USE_MYMATH)
 
   target_compile_definitions(MathFunctions PRIVATE "USE_MYMATH")
 
-  # first we add the executable that generates the table
-  add_executable(MakeTable MakeTable.cxx)
-  target_link_libraries(MakeTable PRIVATE tutorial_compiler_flags)
-
-  # add the command to generate the source code
-  add_custom_command(
-    OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/Table.h
-    COMMAND MakeTable ${CMAKE_CURRENT_BINARY_DIR}/Table.h
-    DEPENDS MakeTable
-    )
+  include(MakeTable.cmake) # generates Table.h
 
   # library that just does sqrt
   add_library(SqrtLibrary STATIC

Help/guide/tutorial/Step10/MathFunctions/MakeTable.cmake

@@ -0,0 +1,10 @@
+# first we add the executable that generates the table
+add_executable(MakeTable MakeTable.cxx)
+target_link_libraries(MakeTable PRIVATE tutorial_compiler_flags)
+
+# add the command to generate the source code
+add_custom_command(
+  OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/Table.h
+  COMMAND MakeTable ${CMAKE_CURRENT_BINARY_DIR}/Table.h
+  DEPENDS MakeTable
+  )

Help/guide/tutorial/Step11/MathFunctions/CMakeLists.txt

@@ -13,16 +13,7 @@ if(USE_MYMATH)
 
   target_compile_definitions(MathFunctions PRIVATE "USE_MYMATH")
 
-  # first we add the executable that generates the table
-  add_executable(MakeTable MakeTable.cxx)
-  target_link_libraries(MakeTable PRIVATE tutorial_compiler_flags)
-
-  # add the command to generate the source code
-  add_custom_command(
-    OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/Table.h
-    COMMAND MakeTable ${CMAKE_CURRENT_BINARY_DIR}/Table.h
-    DEPENDS MakeTable
-    )
+  include(MakeTable.cmake) # generates Table.h
 
   # library that just does sqrt
   add_library(SqrtLibrary STATIC

Help/guide/tutorial/Step11/MathFunctions/MakeTable.cmake

@@ -0,0 +1,10 @@
+# first we add the executable that generates the table
+add_executable(MakeTable MakeTable.cxx)
+target_link_libraries(MakeTable PRIVATE tutorial_compiler_flags)
+
+# add the command to generate the source code
+add_custom_command(
+  OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/Table.h
+  COMMAND MakeTable ${CMAKE_CURRENT_BINARY_DIR}/Table.h
+  DEPENDS MakeTable
+  )

Help/guide/tutorial/Step12/MathFunctions/CMakeLists.txt

@@ -15,16 +15,7 @@ if(USE_MYMATH)
 
   target_compile_definitions(MathFunctions PRIVATE "USE_MYMATH")
 
-  # first we add the executable that generates the table
-  add_executable(MakeTable MakeTable.cxx)
-  target_link_libraries(MakeTable PRIVATE tutorial_compiler_flags)
-
-  # add the command to generate the source code
-  add_custom_command(
-    OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/Table.h
-    COMMAND MakeTable ${CMAKE_CURRENT_BINARY_DIR}/Table.h
-    DEPENDS MakeTable
-    )
+  include(MakeTable.cmake) # generates Table.h
 
   # library that just does sqrt
   add_library(SqrtLibrary STATIC

Help/guide/tutorial/Step12/MathFunctions/MakeTable.cmake

@@ -0,0 +1,10 @@
+# first we add the executable that generates the table
+add_executable(MakeTable MakeTable.cxx)
+target_link_libraries(MakeTable PRIVATE tutorial_compiler_flags)
+
+# add the command to generate the source code
+add_custom_command(
+  OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/Table.h
+  COMMAND MakeTable ${CMAKE_CURRENT_BINARY_DIR}/Table.h
+  DEPENDS MakeTable
+  )

Help/guide/tutorial/Step2/MathFunctions/CMakeLists.txt

@@ -1,7 +1,15 @@
-# TODO 1: Add a library called MathFunctions
+# TODO 14: Remove mysqrt.cxx from the list of sources
+
+# TODO 1: Add a library called MathFunctions with sources MathFunctions.cxx
+# and mysqrt.cxx
 # Hint: You will need the add_library command
 
 # TODO 7: Create a variable USE_MYMATH using option and set default to ON
 
 # TODO 8: If USE_MYMATH is ON, use target_compile_definitions to pass
 # USE_MYMATH as a precompiled definition to our source files
+
+# TODO 12: When USE_MYMATH is ON, add a library for SqrtLibrary with
+# source mysqrt.cxx
+
+# TODO 13: When USE_MYMATH is ON, link SqrtLibrary to the MathFunctions Library

Help/guide/tutorial/Step3/MathFunctions/CMakeLists.txt

@@ -1,4 +1,4 @@
-add_library(MathFunctions MathFunctions.cxx mysqrt.cxx)
+add_library(MathFunctions MathFunctions.cxx)
 
 # TODO 1: State that anybody linking to MathFunctions needs to include the
 # current source directory, while MathFunctions itself doesn't.
@@ -8,4 +8,11 @@ add_library(MathFunctions MathFunctions.cxx mysqrt.cxx)
 option(USE_MYMATH "Use tutorial provided math implementation" ON)
 if (USE_MYMATH)
   target_compile_definitions(MathFunctions PRIVATE "USE_MYMATH")
+
+  # library that just does sqrt
+  add_library(SqrtLibrary STATIC
+              mysqrt.cxx
+              )
+
+  target_link_libraries(MathFunctions PUBLIC SqrtLibrary)
 endif()

Help/guide/tutorial/Step4/CMakeLists.txt

@@ -1,4 +1,4 @@
-# TODO 4: Update the minimum required version to 3.15
+# TODO 5: Update the minimum required version to 3.15
 
 cmake_minimum_required(VERSION 3.10)
 
@@ -15,19 +15,19 @@ project(Tutorial VERSION 1.0)
 set(CMAKE_CXX_STANDARD 11)
 set(CMAKE_CXX_STANDARD_REQUIRED True)
 
-# TODO 5: Create helper variables to determine which compiler we are using:
+# TODO 6: Create helper variables to determine which compiler we are using:
 # * Create a new variable gcc_like_cxx that is true if we are using CXX and
 #   any of the following compilers: ARMClang, AppleClang, Clang, GNU, LCC
 # * Create a new variable msvc_cxx that is true if we are using CXX and MSVC
 # Hint: Use set() and COMPILE_LANG_AND_ID
 
-# TODO 6: Add warning flag compile options to the interface library
+# TODO 7: Add warning flag compile options to the interface library
 # tutorial_compiler_flags.
 # * For gcc_like_cxx, add flags -Wall;-Wextra;-Wshadow;-Wformat=2;-Wunused
 # * For msvc_cxx, add flags -W3
 # Hint: Use target_compile_options()
 
-# TODO 7: With nested generator expressions, only use the flags for the
+# TODO 8: With nested generator expressions, only use the flags for the
 # build-tree
 # Hint: Use BUILD_INTERFACE
 

Help/guide/tutorial/Step4/MathFunctions/CMakeLists.txt

@@ -1,4 +1,5 @@
-add_library(MathFunctions MathFunctions.cxx mysqrt.cxx)
+# create the MathFunctions library
+add_library(MathFunctions MathFunctions.cxx)
 
 # state that anybody linking to us needs to include the current source dir
 # to find MathFunctions.h, while we don't.
@@ -10,6 +11,15 @@ target_include_directories(MathFunctions
 option(USE_MYMATH "Use tutorial provided math implementation" ON)
 if (USE_MYMATH)
   target_compile_definitions(MathFunctions PRIVATE "USE_MYMATH")
+
+  # library that just does sqrt
+  add_library(SqrtLibrary STATIC
+              mysqrt.cxx
+              )
+
+  # TODO 4: Link to tutorial_compiler_flags
+
+  target_link_libraries(MathFunctions PUBLIC SqrtLibrary)
 endif()
 
 # TODO 3: Link to tutorial_compiler_flags

Help/guide/tutorial/Step5/MathFunctions/CMakeLists.txt

@@ -1,4 +1,4 @@
-add_library(MathFunctions MathFunctions.cxx mysqrt.cxx)
+add_library(MathFunctions MathFunctions.cxx)
 
 # state that anybody linking to us needs to include the current source dir
 # to find MathFunctions.h, while we don't.
@@ -10,6 +10,15 @@ target_include_directories(MathFunctions
 option(USE_MYMATH "Use tutorial provided math implementation" ON)
 if (USE_MYMATH)
   target_compile_definitions(MathFunctions PRIVATE "USE_MYMATH")
+
+  # library that just does sqrt
+  add_library(SqrtLibrary STATIC
+              mysqrt.cxx
+              )
+
+  # link our compiler flags interface library
+  target_link_libraries(SqrtLibrary PUBLIC tutorial_compiler_flags)
+  target_link_libraries(MathFunctions PRIVATE SqrtLibrary)
 endif()
 
 # link our compiler flags interface library

Help/guide/tutorial/Step6/MathFunctions/CMakeLists.txt

@@ -1,4 +1,4 @@
-add_library(MathFunctions MathFunctions.cxx mysqrt.cxx)
+add_library(MathFunctions MathFunctions.cxx)
 
 # state that anybody linking to us needs to include the current source dir
 # to find MathFunctions.h, while we don't.
@@ -10,6 +10,14 @@ target_include_directories(MathFunctions
 option(USE_MYMATH "Use tutorial provided math implementation" ON)
 if (USE_MYMATH)
   target_compile_definitions(MathFunctions PRIVATE "USE_MYMATH")
+
+  # library that just does sqrt
+  add_library(SqrtLibrary STATIC
+              mysqrt.cxx
+              )
+
+  target_link_libraries(SqrtLibrary PUBLIC tutorial_compiler_flags)
+  target_link_libraries(MathFunctions PRIVATE SqrtLibrary)
 endif()
 
 # link our compiler flags interface library
@@ -17,6 +25,9 @@ target_link_libraries(MathFunctions PUBLIC tutorial_compiler_flags)
 
 # install libs
 set(installable_libs MathFunctions tutorial_compiler_flags)
+if(TARGET SqrtLibrary)
+  list(APPEND installable_libs SqrtLibrary)
+endif()
 install(TARGETS ${installable_libs} DESTINATION lib)
 # install include headers
 install(FILES MathFunctions.h DESTINATION include)

Help/guide/tutorial/Step7/MathFunctions/CMakeLists.txt

@@ -1,4 +1,4 @@
-add_library(MathFunctions MathFunctions.cxx mysqrt.cxx)
+add_library(MathFunctions MathFunctions.cxx)
 
 # state that anybody linking to us needs to include the current source dir
 # to find MathFunctions.h, while we don't.
@@ -11,6 +11,13 @@ option(USE_MYMATH "Use tutorial provided math implementation" ON)
 if (USE_MYMATH)
   target_compile_definitions(MathFunctions PRIVATE "USE_MYMATH")
 
+  # library that just does sqrt
+  add_library(SqrtLibrary STATIC
+              mysqrt.cxx
+              )
+
+  target_link_libraries(SqrtLibrary PUBLIC tutorial_compiler_flags)
+
   # TODO 1: Include CheckCXXSourceCompiles
 
   # TODO 2: Use check_cxx_source_compiles with simple C++ code to verify
@@ -27,9 +34,11 @@ if (USE_MYMATH)
   # }
 
   # TODO 3: Conditionally on HAVE_LOG and HAVE_EXP, add private compile
-  # definitions "HAVE_LOG" and "HAVE_EXP" to the MathFunctions target.
+  # definitions "HAVE_LOG" and "HAVE_EXP" to the SqrtLibrary target.
 
   # Hint: Use target_compile_definitions()
+
+  target_link_libraries(MathFunctions PRIVATE SqrtLibrary)
 endif()
 
 # link our compiler flags interface library
@@ -37,6 +46,9 @@ target_link_libraries(MathFunctions PUBLIC tutorial_compiler_flags)
 
 # install libs
 set(installable_libs MathFunctions tutorial_compiler_flags)
+if(TARGET SqrtLibrary)
+  list(APPEND installable_libs SqrtLibrary)
+endif()
 install(TARGETS ${installable_libs} DESTINATION lib)
 # install include headers
 install(FILES MathFunctions.h DESTINATION include)

Help/guide/tutorial/Step8/MathFunctions/CMakeLists.txt

@@ -1,10 +1,17 @@
-add_library(MathFunctions MathFunctions.cxx mysqrt.cxx)
+add_library(MathFunctions MathFunctions.cxx)
 
 # should we use our own math functions
 option(USE_MYMATH "Use tutorial provided math implementation" ON)
 if (USE_MYMATH)
   target_compile_definitions(MathFunctions PRIVATE "USE_MYMATH")
 
+  # library that just does sqrt
+  add_library(SqrtLibrary STATIC
+              mysqrt.cxx
+              )
+
+  target_link_libraries(SqrtLibrary PUBLIC tutorial_compiler_flags)
+
   # does this system provide the log and exp functions?
   include(CheckCXXSourceCompiles)
   check_cxx_source_compiles("
@@ -24,10 +31,12 @@ if (USE_MYMATH)
 
   # add compile definitions
   if(HAVE_LOG AND HAVE_EXP)
-    target_compile_definitions(MathFunctions
+    target_compile_definitions(SqrtLibrary
                                PRIVATE "HAVE_LOG" "HAVE_EXP"
                                )
   endif()
+
+  target_link_libraries(MathFunctions PRIVATE SqrtLibrary)
 endif()
 
 # state that anybody linking to us needs to include the current source dir
@@ -41,6 +50,9 @@ target_link_libraries(MathFunctions PUBLIC tutorial_compiler_flags)
 
 # install libs
 set(installable_libs MathFunctions tutorial_compiler_flags)
+if(TARGET SqrtLibrary)
+  list(APPEND installable_libs SqrtLibrary)
+endif()
 install(TARGETS ${installable_libs} DESTINATION lib)
 # install include headers
 install(FILES MathFunctions.h DESTINATION include)

Help/guide/tutorial/Step9/MathFunctions/CMakeLists.txt

@@ -11,16 +11,8 @@ option(USE_MYMATH "Use tutorial provided math implementation" ON)
 if (USE_MYMATH)
   target_compile_definitions(MathFunctions PRIVATE "USE_MYMATH")
 
-  # first we add the executable that generates the table
-  add_executable(MakeTable MakeTable.cxx)
-  target_link_libraries(MakeTable PRIVATE tutorial_compiler_flags)
-
-  # add the command to generate the source code
-  add_custom_command(
-    OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/Table.h
-    COMMAND MakeTable ${CMAKE_CURRENT_BINARY_DIR}/Table.h
-    DEPENDS MakeTable
-    )
+  # generate Table.h
+  include(MakeTable.cmake)
 
   # library that just does sqrt
   add_library(SqrtLibrary STATIC
@@ -30,8 +22,8 @@ if (USE_MYMATH)
 
   # state that we depend on our binary dir to find Table.h
   target_include_directories(SqrtLibrary PRIVATE
-              ${CMAKE_CURRENT_BINARY_DIR}
-              )
+                             ${CMAKE_CURRENT_BINARY_DIR}
+                             )
 
   target_link_libraries(SqrtLibrary PUBLIC tutorial_compiler_flags)
   target_link_libraries(MathFunctions PRIVATE SqrtLibrary)

Help/guide/tutorial/Step9/MathFunctions/MakeTable.cmake

@@ -0,0 +1,10 @@
+# first we add the executable that generates the table
+add_executable(MakeTable MakeTable.cxx)
+target_link_libraries(MakeTable PRIVATE tutorial_compiler_flags)
+
+# add the command to generate the source code
+add_custom_command(
+  OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/Table.h
+  COMMAND MakeTable ${CMAKE_CURRENT_BINARY_DIR}/Table.h
+  DEPENDS MakeTable
+  )