• DLearner (19/19) Jan 17 2023 This relates to the first example under 41.1 Quick Examples.
• Dennis (4/12) Jan 17 2023 What is your `dmd --version`? I suspect you have a version where
• DLearner (7/21) Jan 17 2023 ```
• bachmeier (4/26) Jan 17 2023 You may want to use the nightly build if you're working with
• DLearner (17/45) Jan 17 2023 Downloaded latest dmd for windows from website:
• ryuukk_ (8/54) Jan 17 2023 It works for me
• DLearner (6/64) Jan 17 2023 Tried twice - same result.
• DLearner (4/43) Jan 17 2023 FWIW, now tried a few standard D programs, work fine.
• =?UTF-8?Q?Ali_=c3=87ehreli?= (11/15) Jan 17 2023 I don't use Windows for development but that error message makes me
• DLearner (8/11) Jan 18 2023 Fails with:
• Salih Dincer (4/18) Jan 18 2023 You will run the cl.exe, not the c1.exe
• DLearner (10/30) Jan 18 2023 Unfortunately, neither works:
• =?UTF-8?Q?Ali_=c3=87ehreli?= (4/9) Jan 18 2023 That supports the theory that you don't have a C compiler installed that...
• bachmeier (5/17) Jan 18 2023 The [documentation](https://dlang.org/spec/importc.html#auto-cpp)
• bachmeier (3/27) Jan 18 2023 Or perhaps stated better, I'd have no idea what I'm supposed to
• zjh (8/8) Jan 17 2023 On Tuesday, 17 January 2023 at 11:16:25 UTC, DLearner wrote:
• zjh (5/5) Jan 17 2023 On Wednesday, 18 January 2023 at 02:05:34 UTC, zjh wrote:

DLearner <bmqazwsx123 gmail.com> writes:

This relates to the first example under 41.1 Quick Examples.

Stored as ex01.c, run as shown.


```
#include <stdio.h>
int main()
{
    printf("hello world\n");
    return 0;
}
```

Produced:

```

C:\Users\SoftDev\Documents\BDM\D\ImportC>dmd ex01.c
ex01.c(1): Error: C preprocessor directive `#include` is not 
supported

ex01.c(5): Error: no type for declarator before `return`
ex01.c(6): Error: no type for declarator before `}`
```

Dennis <dkorpel gmail.com> writes:

On Tuesday, 17 January 2023 at 11:16:25 UTC, DLearner wrote:
 ```

 C:\Users\SoftDev\Documents\BDM\D\ImportC>dmd ex01.c
 ex01.c(1): Error: C preprocessor directive `#include` is not 
 supported

 ex01.c(5): Error: no type for declarator before `return`
 ex01.c(6): Error: no type for declarator before `}`
 ```

What is your `dmd --version`? I suspect you have a version where 
you still have to manually pre-process the .c file, instead of a 
more recent version which invokes the pre-processor itself.

DLearner <bmqazwsx123 gmail.com> writes:

On Tuesday, 17 January 2023 at 11:21:08 UTC, Dennis wrote:
 On Tuesday, 17 January 2023 at 11:16:25 UTC, DLearner wrote:
 ```

 C:\Users\SoftDev\Documents\BDM\D\ImportC>dmd ex01.c
 ex01.c(1): Error: C preprocessor directive `#include` is not 
 supported

 ex01.c(5): Error: no type for declarator before `return`
 ex01.c(6): Error: no type for declarator before `}`
 ```

 What is your `dmd --version`? I suspect you have a version 
 where you still have to manually pre-process the .c file, 
 instead of a more recent version which invokes the 
 pre-processor itself.

```
C:\Users\SoftDev>dmd --version
DMD32 D Compiler v2.100.2-dirty
Copyright (C) 1999-2022 by The D Language Foundation, All Rights 
Reserved written by Walter Bright

```

bachmeier <no spam.net> writes:

On Tuesday, 17 January 2023 at 13:21:37 UTC, DLearner wrote:
 On Tuesday, 17 January 2023 at 11:21:08 UTC, Dennis wrote:
 On Tuesday, 17 January 2023 at 11:16:25 UTC, DLearner wrote:
 ```

 C:\Users\SoftDev\Documents\BDM\D\ImportC>dmd ex01.c
 ex01.c(1): Error: C preprocessor directive `#include` is not 
 supported

 ex01.c(5): Error: no type for declarator before `return`
 ex01.c(6): Error: no type for declarator before `}`
 ```

 What is your `dmd --version`? I suspect you have a version 
 where you still have to manually pre-process the .c file, 
 instead of a more recent version which invokes the 
 pre-processor itself.

 ```
 C:\Users\SoftDev>dmd --version
 DMD32 D Compiler v2.100.2-dirty
 Copyright (C) 1999-2022 by The D Language Foundation, All 
 Rights Reserved written by Walter Bright

 ```

You may want to use the nightly build if you're working with 
ImportC: https://github.com/dlang/dmd/releases/tag/nightly 
They're doing a lot of work with it.

DLearner <bmqazwsx123 gmail.com> writes:

On Tuesday, 17 January 2023 at 15:55:40 UTC, bachmeier wrote:
 On Tuesday, 17 January 2023 at 13:21:37 UTC, DLearner wrote:
 On Tuesday, 17 January 2023 at 11:21:08 UTC, Dennis wrote:
 On Tuesday, 17 January 2023 at 11:16:25 UTC, DLearner wrote:
 ```

 C:\Users\SoftDev\Documents\BDM\D\ImportC>dmd ex01.c
 ex01.c(1): Error: C preprocessor directive `#include` is not 
 supported

 ex01.c(5): Error: no type for declarator before `return`
 ex01.c(6): Error: no type for declarator before `}`
 ```

 What is your `dmd --version`? I suspect you have a version 
 where you still have to manually pre-process the .c file, 
 instead of a more recent version which invokes the 
 pre-processor itself.

 ```
 C:\Users\SoftDev>dmd --version
 DMD32 D Compiler v2.100.2-dirty
 Copyright (C) 1999-2022 by The D Language Foundation, All 
 Rights Reserved written by Walter Bright

 ```

 You may want to use the nightly build if you're working with 
 ImportC: https://github.com/dlang/dmd/releases/tag/nightly 
 They're doing a lot of work with it.

Downloaded latest dmd for windows from website:
```
C:\Users\SoftDev>dmd --version
DMD32 D Compiler v2.101.2-dirty
Copyright (C) 1999-2022 by The D Language Foundation, All Rights 
Reserved written by Walter Bright
```

But trial still failed:

```
C:\Users\SoftDev\Documents\BDM\D\ImportC>dmd ex01.c
failed launching cl.exe /P /Zc:preprocessor /PD /nologo ex01.c 
/FIC:\D\dmd2\windows\bin\..\..\src\druntime\import\importc.h 
/Fiex01.i
Error: C preprocess command cl.exe failed for file ex01.c, exit 
status 1

```

ryuukk_ <ryuukk.dev gmail.com> writes:

On Tuesday, 17 January 2023 at 17:12:49 UTC, DLearner wrote:
 On Tuesday, 17 January 2023 at 15:55:40 UTC, bachmeier wrote:
 On Tuesday, 17 January 2023 at 13:21:37 UTC, DLearner wrote:
 On Tuesday, 17 January 2023 at 11:21:08 UTC, Dennis wrote:
 On Tuesday, 17 January 2023 at 11:16:25 UTC, DLearner wrote:
 ```

 C:\Users\SoftDev\Documents\BDM\D\ImportC>dmd ex01.c
 ex01.c(1): Error: C preprocessor directive `#include` is 
 not supported

 ex01.c(5): Error: no type for declarator before `return`
 ex01.c(6): Error: no type for declarator before `}`
 ```

 What is your `dmd --version`? I suspect you have a version 
 where you still have to manually pre-process the .c file, 
 instead of a more recent version which invokes the 
 pre-processor itself.

 ```
 C:\Users\SoftDev>dmd --version
 DMD32 D Compiler v2.100.2-dirty
 Copyright (C) 1999-2022 by The D Language Foundation, All 
 Rights Reserved written by Walter Bright

 ```

 You may want to use the nightly build if you're working with 
 ImportC: https://github.com/dlang/dmd/releases/tag/nightly 
 They're doing a lot of work with it.

 Downloaded latest dmd for windows from website:
 ```
 C:\Users\SoftDev>dmd --version
 DMD32 D Compiler v2.101.2-dirty
 Copyright (C) 1999-2022 by The D Language Foundation, All 
 Rights Reserved written by Walter Bright
 ```

 But trial still failed:

 ```
 C:\Users\SoftDev\Documents\BDM\D\ImportC>dmd ex01.c
 failed launching cl.exe /P /Zc:preprocessor /PD /nologo ex01.c 
 /FIC:\D\dmd2\windows\bin\..\..\src\druntime\import\importc.h 
 /Fiex01.i
 Error: C preprocess command cl.exe failed for file ex01.c, exit 
 status 1

 ```

It works for me

```
C:\Users\ryuukk\tmp>dmd -run ex01.c
hello world
```

Double check your visual studio installation, something is wrong 
with your install probably

DLearner <bmqazwsx123 gmail.com> writes:

On Tuesday, 17 January 2023 at 17:36:41 UTC, ryuukk_ wrote:
 On Tuesday, 17 January 2023 at 17:12:49 UTC, DLearner wrote:
 On Tuesday, 17 January 2023 at 15:55:40 UTC, bachmeier wrote:
 On Tuesday, 17 January 2023 at 13:21:37 UTC, DLearner wrote:
 On Tuesday, 17 January 2023 at 11:21:08 UTC, Dennis wrote:
 On Tuesday, 17 January 2023 at 11:16:25 UTC, DLearner wrote:
 ```

 C:\Users\SoftDev\Documents\BDM\D\ImportC>dmd ex01.c
 ex01.c(1): Error: C preprocessor directive `#include` is 
 not supported

 ex01.c(5): Error: no type for declarator before `return`
 ex01.c(6): Error: no type for declarator before `}`
 ```

 What is your `dmd --version`? I suspect you have a version 
 where you still have to manually pre-process the .c file, 
 instead of a more recent version which invokes the 
 pre-processor itself.

 ```
 C:\Users\SoftDev>dmd --version
 DMD32 D Compiler v2.100.2-dirty
 Copyright (C) 1999-2022 by The D Language Foundation, All 
 Rights Reserved written by Walter Bright

 ```

 You may want to use the nightly build if you're working with 
 ImportC: https://github.com/dlang/dmd/releases/tag/nightly 
 They're doing a lot of work with it.

 Downloaded latest dmd for windows from website:
 ```
 C:\Users\SoftDev>dmd --version
 DMD32 D Compiler v2.101.2-dirty
 Copyright (C) 1999-2022 by The D Language Foundation, All 
 Rights Reserved written by Walter Bright
 ```

 But trial still failed:

 ```
 C:\Users\SoftDev\Documents\BDM\D\ImportC>dmd ex01.c
 failed launching cl.exe /P /Zc:preprocessor /PD /nologo ex01.c 
 /FIC:\D\dmd2\windows\bin\..\..\src\druntime\import\importc.h 
 /Fiex01.i
 Error: C preprocess command cl.exe failed for file ex01.c, 
 exit status 1

 ```

 It works for me

 ```
 C:\Users\ryuukk\tmp>dmd -run ex01.c
 hello world
 ```

 Double check your visual studio installation, something is 
 wrong with your install probably

Tried twice - same result.

But VS installation is itself (IMO) not particularly intuitive.
Would it be possible either to cite known working VS installation 
options on DLang website, or produce Windows installation script 
that takes such options automatically?

DLearner <bmqazwsx123 gmail.com> writes:

On Tuesday, 17 January 2023 at 19:17:31 UTC, DLearner wrote:
 On Tuesday, 17 January 2023 at 17:36:41 UTC, ryuukk_ wrote:
 On Tuesday, 17 January 2023 at 17:12:49 UTC, DLearner wrote:
 On Tuesday, 17 January 2023 at 15:55:40 UTC, bachmeier wrote:



[...]
 Downloaded latest dmd for windows from website:
 ```
 C:\Users\SoftDev>dmd --version
 DMD32 D Compiler v2.101.2-dirty
 Copyright (C) 1999-2022 by The D Language Foundation, All 
 Rights Reserved written by Walter Bright
 ```

 But trial still failed:

 ```
 C:\Users\SoftDev\Documents\BDM\D\ImportC>dmd ex01.c
 failed launching cl.exe /P /Zc:preprocessor /PD /nologo 
 ex01.c 
 /FIC:\D\dmd2\windows\bin\..\..\src\druntime\import\importc.h 
 /Fiex01.i
 Error: C preprocess command cl.exe failed for file ex01.c, 
 exit status 1

 ```

 It works for me

 ```
 C:\Users\ryuukk\tmp>dmd -run ex01.c
 hello world
 ```

 Double check your visual studio installation, something is 
 wrong with your install probably

 Tried twice - same result.

 But VS installation is itself (IMO) not particularly intuitive.
 Would it be possible either to cite known working VS 
 installation options on DLang website, or produce Windows 
 installation script that takes such options automatically?

FWIW, now tried a few standard D programs, work fine.
Suggesting VS is not the problem?

=?UTF-8?Q?Ali_=c3=87ehreli?= <acehreli yahoo.com> writes:

On 1/17/23 12:02, DLearner wrote:

 C:\Users\SoftDev\Documents\BDM\D\ImportC>dmd ex01.c
 failed launching cl.exe /P /Zc:preprocessor [...]




I don't use Windows for development but that error message makes me 
think cl.exe is not found to be executed.

dmd relies on system compiler programs for its ImportC feature. cl.exe 
seems to be the compiler. I think it is the compiler.

Can you run that program from the command line?

Internet makes me think Visual Studio does not install it by default. 
(?) You may have to select C++ (or C?) when installing. (?)

 FWIW, now tried a few standard D programs, work fine.
 Suggesting VS is not the problem?

Standard D programs don't need a C compiler; dmd is the D compiler. It 
needs a C compiler (to preprocess C sources) for ImportC.

Ali

DLearner <bmqazwsx123 gmail.com> writes:

On Tuesday, 17 January 2023 at 22:11:46 UTC, Ali Çehreli wrote:
[...]
 dmd relies on system compiler programs for its ImportC feature. 
 cl.exe seems to be the compiler. I think it is the compiler.

 Can you run that program from the command line?

Fails with:

```
C:\Users\SoftDev>c1.exe
'c1.exe' is not recognized as an internal or external command,
operable program or batch file.

```

Salih Dincer <salihdb hotmail.com> writes:

On Wednesday, 18 January 2023 at 13:45:04 UTC, DLearner wrote:
 On Tuesday, 17 January 2023 at 22:11:46 UTC, Ali Çehreli wrote:
 [...]
 dmd relies on system compiler programs for its ImportC 
 feature. cl.exe seems to be the compiler. I think it is the 
 compiler.

 Can you run that program from the command line?

 Fails with:

 ```
 C:\Users\SoftDev>c1.exe
 'c1.exe' is not recognized as an internal or external command,
 operable program or batch file.

 ```

You will run the cl.exe, not the c1.exe
(be written with the letter l)

SDB 79

DLearner <bmqazwsx123 gmail.com> writes:

On Wednesday, 18 January 2023 at 14:18:58 UTC, Salih Dincer wrote:
 On Wednesday, 18 January 2023 at 13:45:04 UTC, DLearner wrote:
 On Tuesday, 17 January 2023 at 22:11:46 UTC, Ali Çehreli wrote:
 [...]
 dmd relies on system compiler programs for its ImportC 
 feature. cl.exe seems to be the compiler. I think it is the 
 compiler.

 Can you run that program from the command line?

 Fails with:

 ```
 C:\Users\SoftDev>c1.exe
 'c1.exe' is not recognized as an internal or external command,
 operable program or batch file.

 ```

 You will run the cl.exe, not the c1.exe
 (be written with the letter l)

 SDB 79

Unfortunately, neither works:
```
C:\Users\SoftDev>cl.exe
'cl.exe' is not recognized as an internal or external command,
operable program or batch file.

C:\Users\SoftDev>c1.exe
'c1.exe' is not recognized as an internal or external command,
operable program or batch file.
```

=?UTF-8?Q?Ali_=c3=87ehreli?= <acehreli yahoo.com> writes:

On 1/18/23 08:04, DLearner wrote:

 Unfortunately, neither works:
 ```
 C:\Users\SoftDev>cl.exe
 'cl.exe' is not recognized as an internal or external command,
 operable program or batch file.

That supports the theory that you don't have a C compiler installed that 
dmd can use for preprocessing C files.

Ali

bachmeier <no spam.net> writes:

On Wednesday, 18 January 2023 at 16:37:17 UTC, Ali Çehreli wrote:
 On 1/18/23 08:04, DLearner wrote:

 Unfortunately, neither works:
 ```
 C:\Users\SoftDev>cl.exe
 'cl.exe' is not recognized as an internal or external command,
 operable program or batch file.

 That supports the theory that you don't have a C compiler 
 installed that dmd can use for preprocessing C files.

 Ali

The [documentation](https://dlang.org/spec/importc.html#auto-cpp) 
says

 When compiling for Windows with the -m32mscoff or the -m64 
 switch, cl.exe /P /Zc:preprocessor will be used as the 
 preprocessor.

It might be useful for someone to add more information. I would 
certainly have no idea what that means if I tried to use Windows.

bachmeier <no spam.net> writes:

On Wednesday, 18 January 2023 at 16:51:27 UTC, bachmeier wrote:
 On Wednesday, 18 January 2023 at 16:37:17 UTC, Ali Çehreli 
 wrote:
 On 1/18/23 08:04, DLearner wrote:

 Unfortunately, neither works:
 ```
 C:\Users\SoftDev>cl.exe
 'cl.exe' is not recognized as an internal or external 
 command,
 operable program or batch file.

 That supports the theory that you don't have a C compiler 
 installed that dmd can use for preprocessing C files.

 Ali

 The 
 [documentation](https://dlang.org/spec/importc.html#auto-cpp) 
 says

 When compiling for Windows with the -m32mscoff or the -m64 
 switch, cl.exe /P /Zc:preprocessor will be used as the 
 preprocessor.

 It might be useful for someone to add more information. I would 
 certainly have no idea what that means if I tried to use 
 Windows.

Or perhaps stated better, I'd have no idea what I'm supposed to 
install or set up to get it to work.

zjh <fqbqrr 163.com> writes:

On Tuesday, 17 January 2023 at 11:16:25 UTC, DLearner wrote:

With the latest version of 'dmd101.2',`dmd a.c`, I get:
C:\Windows 
Kits\10\Include\10.0.22000.0\ucrt\corecrt_wstdio.h|1208| Error: 
function `a.__vswprintf_l` redeclaration with different type
C:\Windows 
Kits\10\Include\10.0.22000.0\ucrt\corecrt_wstdio.h|1405| Error: 
function `a.__swprintf_l` redeclaration with different type

zjh <fqbqrr 163.com> writes:

On Wednesday, 18 January 2023 at 02:05:34 UTC, zjh wrote:
< ...

`nightly`:
Unresolved external symbol `__va_start`, function `_fwprintf_`.
link error.