# CHECK\_TYPE\_SIZE regression in CMake-3.25.0

**URL:** https://discourse.cmake.org/t/check-type-size-regression-in-cmake-3-25-0/6923
**Category:** Code
**Tags:** os:windows, comp:msvc, gen:vs
**Created:** [November 21, 2022, 8:15pm UTC](https://discourse.cmake.org/t/check-type-size-regression-in-cmake-3-25-0/6923 "2022-11-21T20:15:06Z")
**Posts on this page:** 5
**Page:** 1

<div class="post-metadata">

### Author: ![lassoan](https://discourse.cmake.org/user_avatar/discourse.cmake.org/lassoan/32/2938_2.png) [@lassoan](https://discourse.cmake.org/u/lassoan)
#### Post date: [November 21, 2022, 8:15pm UTC](https://discourse.cmake.org/t/check-type-size-regression-in-cmake-3-25-0/6923/1 "2022-11-21T20:15:06Z")

</div>

When configuring DCMTK project `CHECK_TYPE_SIZE` function started to fail when switched to CMake-3.25.0, on Windows, using VS 2022, x64. It works well when using CMake-3.24.3.

Multiple other people have reported the same issue with CMake-3.25.0 on other projects - see for example OpenCV: [Cmake Compile Error for Opencv 4.5.5 · Issue #22784 · opencv/opencv · GitHub](https://github.com/opencv/opencv/issues/22784)

## How to reproduce:

- Get DCMTK from `github.com/DCMTK/dcmtk`
- Configure using VS2022

Problematic CMake command:

```auto
include (CheckTypeSize)
CHECK_TYPE_SIZE("char" SIZEOF_CHAR)

```

For convenience, I’ve also uploaded the [source code, build tree, and trace log as a zip file](https://1drv.ms/u/s!Arm_AFxB9yqHyp0dE8eUGNzWnhRApA?e=AizhOY).

## Result:

The exact same source code is configured exactly the same way.

### Result when using CMake-3.24.3:

```auto
Check size of char
Check size of char - done

```

> **Trace obtained with 3.24.3**
>
> ```auto
> C:/Program Files/CMake-3.24.3/share/cmake-3.24/Modules/CheckTypeSize.cmake(139): foreach(h ${CMAKE_EXTRA_INCLUDE_FILES} )
> C:/Program Files/CMake-3.24.3/share/cmake-3.24/Modules/CheckTypeSize.cmake(144): set(bin ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CheckTypeSize/${var}.bin )
> C:/Program Files/CMake-3.24.3/share/cmake-3.24/Modules/CheckTypeSize.cmake(145): configure_file(${__check_type_size_dir}/CheckTypeSize.c.in ${src} @ONLY )
> C:/Program Files/CMake-3.24.3/share/cmake-3.24/Modules/CheckTypeSize.cmake(146): try_compile(HAVE_${var} ${CMAKE_BINARY_DIR} ${src} COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS} LINK_OPTIONS ${CMAKE_REQUIRED_LINK_OPTIONS} LINK_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES} CMAKE_FLAGS -DCOMPILE_DEFINITIONS:STRING=${CMAKE_REQUIRED_FLAGS} -DINCLUDE_DIRECTORIES:STRING=${CMAKE_REQUIRED_INCLUDES} OUTPUT_VARIABLE output COPY_FILE ${bin} )
> C:/Program Files/CMake-3.24.3/share/cmake-3.24/Modules/CheckTypeSize.cmake(157): if(HAVE_${var} )
> C:/Program Files/CMake-3.24.3/share/cmake-3.24/Modules/CheckTypeSize.cmake(159): file(STRINGS ${bin} strings LIMIT_COUNT 10 REGEX INFO:size )
> C:/Program Files/CMake-3.24.3/share/cmake-3.24/Modules/CheckTypeSize.cmake(162): set(regex_size .*INFO:size\\[0*([^]]*)\\].* )
> C:/Program Files/CMake-3.24.3/share/cmake-3.24/Modules/CheckTypeSize.cmake(163): set(regex_key key\\[([^]]*)\\] )
> C:/Program Files/CMake-3.24.3/share/cmake-3.24/Modules/CheckTypeSize.cmake(164): set(keys )
> C:/Program Files/CMake-3.24.3/share/cmake-3.24/Modules/CheckTypeSize.cmake(165): set(code )
> C:/Program Files/CMake-3.24.3/share/cmake-3.24/Modules/CheckTypeSize.cmake(166): set(mismatch )
> C:/Program Files/CMake-3.24.3/share/cmake-3.24/Modules/CheckTypeSize.cmake(167): set(first 1 )
> C:/Program Files/CMake-3.24.3/share/cmake-3.24/Modules/CheckTypeSize.cmake(168): foreach(info ${strings} )
> C:/Program Files/CMake-3.24.3/share/cmake-3.24/Modules/CheckTypeSize.cmake(169): if(${info} MATCHES ${regex_size} )
> C:/Program Files/CMake-3.24.3/share/cmake-3.24/Modules/CheckTypeSize.cmake(171): set(size ${CMAKE_MATCH_1} )
> C:/Program Files/CMake-3.24.3/share/cmake-3.24/Modules/CheckTypeSize.cmake(172): if(first )
> C:/Program Files/CMake-3.24.3/share/cmake-3.24/Modules/CheckTypeSize.cmake(173): set(${var} ${size} )
> C:/Program Files/CMake-3.24.3/share/cmake-3.24/Modules/CheckTypeSize.cmake(177): set(first 0 )
> C:/Program Files/CMake-3.24.3/share/cmake-3.24/Modules/CheckTypeSize.cmake(180): string(REGEX MATCH ${regex_key} key ${info} )
> C:/Program Files/CMake-3.24.3/share/cmake-3.24/Modules/CheckTypeSize.cmake(181): string(REGEX REPLACE ${regex_key} \\1 key ${key} )
> C:/Program Files/CMake-3.24.3/share/cmake-3.24/Modules/CheckTypeSize.cmake(182): if(key )
> C:/Program Files/CMake-3.24.3/share/cmake-3.24/Modules/CheckTypeSize.cmake(190): if(mismatch AND keys )
> C:/Program Files/CMake-3.24.3/share/cmake-3.24/Modules/CheckTypeSize.cmake(193): else()
> C:/Program Files/CMake-3.24.3/share/cmake-3.24/Modules/CheckTypeSize.cmake(194): file(REMOVE ${map} )
> C:/Program Files/CMake-3.24.3/share/cmake-3.24/Modules/CheckTypeSize.cmake(197): if(mismatch AND NOT keys )
> C:/Program Files/CMake-3.24.3/share/cmake-3.24/Modules/CheckTypeSize.cmake(201): if(NOT CMAKE_REQUIRED_QUIET )
> C:/Program Files/CMake-3.24.3/share/cmake-3.24/Modules/CheckTypeSize.cmake(202): message(CHECK_PASS done )
> -- Check size of char - done
> C:/Program Files/CMake-3.24.3/share/cmake-3.24/Modules/CheckTypeSize.cmake(204): file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log Determining size of ${type} passed with the following output:\n${output}\n\n )
> C:/Program Files/CMake-3.24.3/share/cmake-3.24/Modules/CheckTypeSize.cmake(206): set(${var} ${${var}} CACHE INTERNAL CHECK_TYPE_SIZE: sizeof(${type}) )
> CMake Warning (dev) at C:/Program Files/CMake-3.24.3/share/cmake-3.24/Modules/CheckTypeSize.cmake:206 (set):
> Policy CMP0126 is not set: set(CACHE) does not remove a normal variable of
> the same name. Run "cmake --help-policy CMP0126" for policy details. Use
> the cmake_policy command to set the policy and suppress this warning.
> 
> For compatibility with older versions of CMake, normal variable
> "SIZEOF_CHAR" will be removed from the current scope.
> Call Stack (most recent call first):
> C:/Program Files/CMake-3.24.3/share/cmake-3.24/Modules/CheckTypeSize.cmake:277 (__check_type_size_impl)
> 
> ```

### Result when using CMake-3.25.0:

```auto
Check size of char
CMake Error at C:/Program Files/CMake-3.25.0/share/cmake-3.25/Modules/CheckTypeSize.cmake:147 (try_compile):
  Cannot copy output executable

    ''

  to destination specified by COPY_FILE:

    'C:/D/DCMTK-build325/CMakeFiles/CheckTypeSize/SIZEOF_CHAR.bin'

  Recorded try_compile output location doesn't exist:

    C:/D/DCMTK-build325/CMakeFiles/CMakeScratch/TryCompile-wd3ff3/Debug/cmTC_45f0b.exe

Call Stack (most recent call first):
  C:/Program Files/CMake-3.25.0/share/cmake-3.25/Modules/CheckTypeSize.cmake:277 (__check_type_size_impl)
  CMake/GenerateDCMTKConfigure.cmake:175 (CHECK_TYPE_SIZE)
  CMake/dcmtkPrepare.cmake:481 (include)
  CMakeLists.txt:44 (include)

```

> **Trace obtained with 3.25.0**
>
> ```auto
> C:/Program Files/CMake-3.25.0/share/cmake-3.25/Modules/CheckTypeSize.cmake(139): foreach(h ${CMAKE_EXTRA_INCLUDE_FILES} )
> C:/Program Files/CMake-3.25.0/share/cmake-3.25/Modules/CheckTypeSize.cmake(144): set(bin ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CheckTypeSize/${var}.bin )
> C:/Program Files/CMake-3.25.0/share/cmake-3.25/Modules/CheckTypeSize.cmake(145): file(READ ${__check_type_size_dir}/CheckTypeSize.c.in src_content )
> C:/Program Files/CMake-3.25.0/share/cmake-3.25/Modules/CheckTypeSize.cmake(146): string(CONFIGURE ${src_content} src_content @ONLY )
> C:/Program Files/CMake-3.25.0/share/cmake-3.25/Modules/CheckTypeSize.cmake(147): try_compile(HAVE_${var} SOURCE_FROM_VAR ${src} src_content COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS} LINK_OPTIONS ${CMAKE_REQUIRED_LINK_OPTIONS} LINK_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES} CMAKE_FLAGS -DCOMPILE_DEFINITIONS:STRING=${CMAKE_REQUIRED_FLAGS} -DINCLUDE_DIRECTORIES:STRING=${CMAKE_REQUIRED_INCLUDES} OUTPUT_VARIABLE output COPY_FILE ${bin} )
> CMake Error at C:/Program Files/CMake-3.25.0/share/cmake-3.25/Modules/CheckTypeSize.cmake:147 (try_compile):
> Cannot copy output executable
> 
> ''
> 
> to destination specified by COPY_FILE:
> 
> 'C:/D/DCMTK-build325/CMakeFiles/CheckTypeSize/SIZEOF_CHAR.bin'
> 
> Recorded try_compile output location doesn't exist:
> 
> C:/D/DCMTK-build325/CMakeFiles/CMakeScratch/TryCompile-fn88sh/Debug/cmTC_b1ee1.exe
> 
> Call Stack (most recent call first):
> C:/Program Files/CMake-3.25.0/share/cmake-3.25/Modules/CheckTypeSize.cmake:277 (__check_type_size_impl)
> 
> ```

There are 2-3 recent commits that probably caused the issue: `https://gitlab.kitware.com/cmake/cmake/-/commits/master/Modules/CheckTypeSize.cmake`

@Matthew_Woehlke @brad.king

---

<div class="post-metadata">

### Author: ![ben.boeckel](https://discourse.cmake.org/letter_avatar_proxy/v4/letter/b/ea5d25/32.png) [@ben.boeckel](https://discourse.cmake.org/u/ben.boeckel)
#### Post date: [November 21, 2022, 10:00pm UTC](https://discourse.cmake.org/t/check-type-size-regression-in-cmake-3-25-0/6923/2 "2022-11-21T22:00:29Z")

</div>

Thanks for the report. Please file [an issue](https://gitlab.kitware.com/cmake/cmake/-/issues) to track this.

---

<div class="post-metadata">

### Author: ![Matthew\_Woehlke](https://discourse.cmake.org/user_avatar/discourse.cmake.org/matthew_woehlke/32/2345_2.png) [@Matthew\_Woehlke](https://discourse.cmake.org/u/Matthew_Woehlke)
#### Post date: [November 21, 2022, 10:30pm UTC](https://discourse.cmake.org/t/check-type-size-regression-in-cmake-3-25-0/6923/3 "2022-11-21T22:30:27Z")

</div>

The error certainly makes the new `try_compile` stuff suspect. It’s less clear whether I botched something in the last two chances or if there’s something broken with the underlying functionality.

I don’t have time to try compiling DCMTK on my Linux machine today, and I don’t have a Windows machine at the moment. Looking at the `.zip`, though, I notice there is no `.exe` in the `try_compile` directory. I also notice that neither your report, above, nor the included `trace.txt` match the one `try_compile` directory in the `.zip`. Are the build tree and `trace.txt` from the same run? Did you use `--debug-trycompile`?

---

<div class="post-metadata">

### Author: ![lassoan](https://discourse.cmake.org/user_avatar/discourse.cmake.org/lassoan/32/2938_2.png) [@lassoan](https://discourse.cmake.org/u/lassoan)
#### Post date: [November 21, 2022, 11:05pm UTC](https://discourse.cmake.org/t/check-type-size-regression-in-cmake-3-25-0/6923/4 "2022-11-21T23:05:12Z")

</div>

> [@Matthew\_Woehlke](#):
>
> I don’t have a Windows machine at the moment

If that helps, we can do a remote desktop session so that you can debug on my computer. I’m building CMake now, so that you can do step-by-step debugging and changes in C++ part. You can write me a private message to set up a time.

> [@Matthew\_Woehlke](#):
>
> Are the build tree and `trace.txt` from the same run?

Yes.

> [@Matthew\_Woehlke](#):
>
> Did you use `--debug-trycompile`?

I used this command in `c:\D\DCMTK-build325`:

```
"c:\Program Files\CMake-3.25.0\bin\cmake.exe" ..\DCMTK --trace > trace.txt 2>&1

```

---

<div class="post-metadata">

### Author: ![lassoan](https://discourse.cmake.org/user_avatar/discourse.cmake.org/lassoan/32/2938_2.png) [@lassoan](https://discourse.cmake.org/u/lassoan)
#### Post date: [November 21, 2022, 11:08pm UTC](https://discourse.cmake.org/t/check-type-size-regression-in-cmake-3-25-0/6923/5 "2022-11-21T23:08:24Z")

</div>

> [@ben.boeckel](#):
>
> Thanks for the report. Please file [an issue](https://gitlab.kitware.com/cmake/cmake/-/issues) to track this.

I’ve submitted this issue:

[https://gitlab.kitware.com/cmake/cmake/-/issues/24180](https://gitlab.kitware.com/cmake/cmake/-/issues/24180)