Open Watcom V2 CMake build #716

FredEckert · 2021-07-23T02:01:29Z

FredEckert
Jul 23, 2021

Hello :-)

Does anyone have an example of a cmake toolchain file for cross compiling with open watcom v2? Host: Window10 x64, Target: DOS 32-Bit DOS4G/W.

I have scoured the web and studied the cmake docs but I am having trouble making the leap to a clear understanding of how to construct such a toolchain file. I have tried all sorts of things but can't get cmake to successfully build code that builds just fine with wmake and a good old fashioned wmake makefile.

Side Note: I am really seeking an out-of-source build system for open watcom v2. cmake seems to be the correct approach for this. If there is any other recommend approach, I would be interested in learning about it.

Answered by jmalak

Jul 23, 2021

From CMake version 3.18 OpenWatcom Cross-compile support for DOS, OS/2, Windows and Linux is included in CMake.
Details you can see in #687 #599 #594

Below are cross-compilation commands for CMake 3.18 and above (run on Linux or Windows). It supposes configured OW for your host (Windows or Linux).

16-bit DOS Target cmake command
cmake -G "Watcom WMake" -D CMAKE_SYSTEM_NAME=DOS -D CMAKE_SYSTEM_PROCESSOR=I86 ...

32-bit DOS Target cmake command
cmake -G "Watcom WMake" -D CMAKE_SYSTEM_NAME=DOS ...

16-bit OS2 Target cmake command
cmake -G "Watcom WMake" -D CMAKE_SYSTEM_NAME=OS2 -D CMAKE_SYSTEM_PROCESSOR=I86 ...

32-bit OS2 Target cmake command
cmake -G "Watcom WMake" -D CMAKE_SYSTEM_NAME=OS2 ...

…

View full answer

jmalak · 2021-07-23T03:34:34Z

jmalak
Jul 23, 2021
Maintainer

From CMake version 3.18 OpenWatcom Cross-compile support for DOS, OS/2, Windows and Linux is included in CMake.
Details you can see in #687 #599 #594

Below are cross-compilation commands for CMake 3.18 and above (run on Linux or Windows). It supposes configured OW for your host (Windows or Linux).

16-bit DOS Target cmake command
cmake -G "Watcom WMake" -D CMAKE_SYSTEM_NAME=DOS -D CMAKE_SYSTEM_PROCESSOR=I86 ...

32-bit DOS Target cmake command
cmake -G "Watcom WMake" -D CMAKE_SYSTEM_NAME=DOS ...

16-bit OS2 Target cmake command
cmake -G "Watcom WMake" -D CMAKE_SYSTEM_NAME=OS2 -D CMAKE_SYSTEM_PROCESSOR=I86 ...

32-bit OS2 Target cmake command
cmake -G "Watcom WMake" -D CMAKE_SYSTEM_NAME=OS2 ...

32-bit Windows Target cmake command
cmake -G "Watcom WMake" -D CMAKE_SYSTEM_NAME=Windows ...

32-bit Linux Target cmake command
cmake -G "Watcom WMake" -D CMAKE_SYSTEM_NAME=Linux ...

6 replies

FredEckert Jul 23, 2021
Author

Yes. This is what I have tried but is not working for me. I am launching the Open Watcom V2 "Open Watcom Build Environment" command prompt from the installer created start menu icon. This action sets up my open watcom environment. I don't have CMake in my path so I type the full path:

C:\TEST>"c:\Program Files\CMake\bin\cmake.exe" -G "Watcom WMake" -D CMAKE_SYSTEM_NAME=DOS -S . -B build

If I am trying the gui, I type:

C:\TEST>"C:\Program Files\CMake\bin\cmake-gui.exe"

I do this because I believe that cmake needs to have knowledge of open watcom environment variables...

To build the code I do this:

C:\TEST>"C:\Program Files\CMake\bin\cmake.exe" --build build

The build always fails.

If you see anything obviously wrong with the process above, please let me know. I will try making a smaller test case to see if I can get something simple working...

jmalak Jul 23, 2021
Maintainer

I think it should work.
What exactly failed?
Creation of build make files or build process when you run wmake?

FredEckert Jul 23, 2021
Author

The creation process succeeds like this:

C:\TEST>"c:\Program Files\CMake\bin\cmake.exe" -G "Watcom WMake" -D CMAKE_SYSTEM_NAME=DOS -S . -B build
-- The C compiler identification is OpenWatcom 2.0
-- The CXX compiler identification is OpenWatcom 2.0
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: C:/WATCOM/binnt64/wcl386.exe - skipped
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: C:/WATCOM/binnt64/wcl386.exe - skipped
-- Configuring done
-- Generating done
-- Build files have been written to: C:/TEST/build

The build process fails like this:

C:\TEST>"C:\Program Files\CMake\bin\cmake.exe" --build build
Open Watcom Make Version 2.0 beta Feb 4 2021 00:39:12 (64-bit)
Copyright (c) 2002-2021 The Open Watcom Contributors. All Rights Reserved.
Portions Copyright (c) 1988-2002 Sybase, Inc. All Rights Reserved.
Source code is available under the Sybase Open Watcom Public License.
See http://www.openwatcom.org/ for details.
Scanning dependencies of target ex22
[ 20%] Building C object src/CMakeFiles/ex22.dir/DBG.H.obj
[ 40%] Building C object src/CMakeFiles/ex22.dir/EX22.H.obj
[ 60%] Building C object src/CMakeFiles/ex22.dir/EX22.C.obj
[ 80%] Building C object src/CMakeFiles/ex22.dir/EX22_MAIN.C.obj
C:\TEST\src\EX22_MAIN.C(47): Error! E1077: Missing '}'
C:\TEST\src\EX22_MAIN.C(23): Warning! W303: Parameter 'argv' has been defined, but not referenced
C:\TEST\src\EX22_MAIN.C(23): Warning! W303: Parameter 'argc' has been defined, but not referenced
C:\TEST\src\EX22_MAIN.C(47): Warning! W107: Missing return value for function 'main'
C:\TEST\src\EX22_MAIN.C(48): Error! E1116: An id list not allowed except for function definition
C:\TEST\src\EX22_MAIN.C(48): Warning! W304: Return type 'int' assumed for function 'scope_demo'
C:\TEST\src\EX22_MAIN.C(48): Error! E1062: Inconsistent return type for function 'scope_demo'
C:\TEST\src\EX22_MAIN.C(48): Note! N2003: source conversion type is 'int'
C:\TEST\src\EX22_MAIN.C(48): Note! N2004: target conversion type is 'void'
C:\TEST\src\EX22_MAIN.C(48): Note! N2002: 'scope_demo' defined in: C:\TEST\src\EX22_MAIN.C(6)
C:\TEST\src\EX22_MAIN.C(49): Error! E1009: Expecting ',' but found '*'
C:\TEST\src\EX22_MAIN.C(49): Error! E1116: An id list not allowed except for function definition
C:\TEST\src\EX22_MAIN.C(49): Warning! W304: Return type 'int' assumed for function 'scope_demo'
C:\TEST\src\EX22_MAIN.C(49): Error! E1062: Inconsistent return type for function 'scope_demo'
C:\TEST\src\EX22_MAIN.C(49): Note! N2003: source conversion type is 'int'
C:\TEST\src\EX22_MAIN.C(49): Note! N2004: target conversion type is 'void'
C:\TEST\src\EX22_MAIN.C(49): Note! N2002: 'scope_demo' defined in: C:\TEST\src\EX22_MAIN.C(6)
C:\TEST\src\EX22_MAIN.C(51): Error! E1009: Expecting ')' but found '('
C:\TEST\src\EX22_MAIN.C(51): Error! E1009: Expecting ')' but found '('
C:\TEST\src\EX22_MAIN.C(51): Error! E1094: Function cannot return a function
C:\TEST\src\EX22_MAIN.C(51): Error! E1094: Function cannot return a function
C:\TEST\src\EX22_MAIN.C(51): Warning! W304: Return type 'int' assumed for function 'fprintf'
C:\TEST\src\EX22_MAIN.C(51): Error! E1062: Inconsistent return type for function 'fprintf'
C:\TEST\src\EX22_MAIN.C(51): Note! N2003: source conversion type is 'int (void)(void))()(void))()'
C:\TEST\src\EX22_MAIN.C(51): Note! N2004: target conversion type is 'int'
C:\TEST\src\EX22_MAIN.C(51): Note! N2002: 'fprintf' defined in: C:\WATCOM\h\stdio.h(345)
C:\TEST\src\EX22_MAIN.C(51): Error! E1151: Parameter count does not agree with previous definition
C:\TEST\src\EX22_MAIN.C(51): Error! E1044: Variable 'fprintf' has incomplete type
C:\TEST\src\EX22_MAIN.C(51): Error! E1026: Invalid declarator
C:\TEST\src\EX22_MAIN.C(51): Error! E1009: Expecting ',' but found '&'
C:\TEST\src\EX22_MAIN.C(51): Error! E1024: Declared symbol '__iob' is not in parameter list
C:\TEST\src\EX22_MAIN.C(51): Error! E1009: Expecting ',' but found ')'
C:\TEST\src\EX22_MAIN.C(51): Error! E1026: Invalid declarator
C:\TEST\src\EX22_MAIN.C(51): Error! E1026: Invalid declarator
C:\TEST\src\EX22_MAIN.C(51): Error! E1009: Expecting ',' but found '[INFO] (%s:%d:) '
C:\TEST\src\EX22_MAIN.C(51): Error! E1147: Too many errors: compilation aborted
Error: Compiler returned a bad status compiling "C:\TEST\src\EX22_MAIN.C"
Error(E42): Last command making (src\CMakeFiles\ex22.dir\EX22_MAIN.C.obj) returned a bad status
Error(E02): Make execution terminated
Error(E42): Last command making (src\CMakeFiles\ex22.dir\all) returned a bad status
Error(E02): Make execution terminated
Error(E42): Last command making (all) returned a bad status
Error(E02): Make execution terminated

Perhaps the problem is in my CMakeLists.txt files...

Top level file:

# CMakeList.txt : Top-level CMake project file, do global configuration
# and include sub-projects here.
#
cmake_minimum_required(VERSION 3.21)
project("ex22" VERSION 0.0.0.1)

# Include sub-projects.
add_subdirectory("src")

Lower level file:

# CMakeList.txt : CMake project for ex22, include source and define
# project specific logic here.
#

# Add source to this project's executable.


################################################################################
# Source groups
################################################################################
set(Header_Files
    "DBG.H"
    "EX22.H"
)
source_group("Header Files" FILES ${Header_Files})

set(Source_Files
    "EX22.C"
    "EX22_MAIN.C"
)
source_group("Source Files" FILES ${Source_Files})

set(ALL_FILES
    ${Header_Files}
    ${Source_Files}
)

set_source_files_properties(${ALL_FILES} PROPERTIES LANGUAGE C)


################################################################################
# Target
################################################################################
add_executable(${PROJECT_NAME} ${ALL_FILES})


################################################################################
# Dependencies
################################################################################


# TODO: Add tests and install targets if needed.

I attached two test case files: TEST-cmake.zip and TEST-makefile.zip. They are both the same code. The traditional in-source-build makefile build works. The cmake fails to build.

TEST-cmake.zip
TEST-makefile.zip

jmalak Jul 23, 2021
Maintainer

it looks like a problem with warning level and your source code required standard.
The main problem is that your code is C99 standard, but OW compiler use C89/90 standard by default.
Default OW compiler warning level is 1.
Cmake make file uses warning level 3 (more strict) and C89/90 standard.

Anyway cmake is working OK, only problem with compiler options used by Cmake definition, need correction.
You need to add extra option for C99 standard -za99 to cmake and set warning level to 1 if you want the same behavior.

FredEckert Jul 23, 2021
Author

I added the -za99 compiler flag:

# CMakeList.txt : CMake project for ex22, include source and define
# project specific logic here.
#

# Add source to this project's executable.

################################################################################
# Source groups
################################################################################
set(Header_Files
    "DBG.H"
    "EX22.H"
)
source_group("Header Files" FILES ${Header_Files})

set(Source_Files
    "EX22.C"
    "EX22_MAIN.C"
)
source_group("Source Files" FILES ${Source_Files})

set(ALL_FILES
    ${Header_Files}
    ${Source_Files}
)

set_source_files_properties(${ALL_FILES} PROPERTIES LANGUAGE C)
set(CMAKE_C_FLAGS "-za99")

################################################################################
# Target
################################################################################
add_executable(${PROJECT_NAME} ${ALL_FILES})


################################################################################
# Dependencies
################################################################################


# TODO: Add tests and install targets if needed.

and it worked:

C:\TEST>"C:\Program Files\CMake\bin\cmake.exe" --build build
Open Watcom Make Version 2.0 beta Feb 4 2021 00:39:12 (64-bit)
Copyright (c) 2002-2021 The Open Watcom Contributors. All Rights Reserved.
Portions Copyright (c) 1988-2002 Sybase, Inc. All Rights Reserved.
Source code is available under the Sybase Open Watcom Public License.
See http://www.openwatcom.org/ for details.
Scanning dependencies of target ex22
[ 20%] Building C object src/CMakeFiles/ex22.dir/DBG.H.obj
[ 40%] Building C object src/CMakeFiles/ex22.dir/EX22.H.obj
[ 60%] Building C object src/CMakeFiles/ex22.dir/EX22.C.obj
[ 80%] Building C object src/CMakeFiles/ex22.dir/EX22_MAIN.C.obj
[100%] Linking C executable ex22.exe
[100%] Built target ex22

C:\TEST>

Thank You!

jmalak · 2021-12-04T12:47:21Z

jmalak
Dec 4, 2021
Maintainer

New page in OW 2.0 Wiki was created OW tools usage with CMake

0 replies

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Open Watcom V2 CMake build #716

FredEckert Jul 23, 2021

Replies: 2 comments · 6 replies

jmalak Jul 23, 2021 Maintainer

FredEckert Jul 23, 2021 Author

jmalak Jul 23, 2021 Maintainer

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jmalak Jul 23, 2021 Maintainer

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jmalak Dec 4, 2021 Maintainer

FredEckert
Jul 23, 2021

Replies: 2 comments 6 replies

jmalak
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FredEckert Jul 23, 2021
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jmalak Jul 23, 2021
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FredEckert Jul 23, 2021
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jmalak Jul 23, 2021
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FredEckert Jul 23, 2021
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jmalak
Dec 4, 2021
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