New member here, need some guidance to start

[kcvinu]

Hi all,
I am a hobby programmer from India. Probably somebody from this forum might know me since I am a member of FreeBasic forum.
Now, I would like to wet my toe in MASM64 with my Windows 11. I have Visual Studio 2022 and I ran a test asm code successfully. But I would like to know how to run my asm file without the help of VS2022. Now the linker is complaining that it can't find the 'msvcrt.lib'
What I did ?
1. Write code in an .asm file and save it.
2. Run ml64.exe with this asm file and created .obj file.
3. Rum link.exe with this code - "link /SUBSYSTEM:CONSOLE /OUT:t1.exe t1.obj msvcrt.lib"

 

[NoCforMe]

3. Rum link.exe with this code - "link /SUBSYSTEM:CONSOLE /OUT:t1.exe t1.obj msvcrt.lib"

Dumb question, I know, but do you actually have msvcrt.lib?

[zedd151]

kcvinu, could you post your source code? There may be another way to do what you are trying to achieve.

I have asked that this thread be moved to the Campus...

[StrykerX]

Moved to The Campus. 

[TimoVJL]

link needs library path for libraries.
with /LIBPATH:dir is possible to point folder for library

[kcvinu]

3. Rum link.exe with this code - "link /SUBSYSTEM:CONSOLE /OUT:t1.exe t1.obj msvcrt.lib"

Dumb question, I know, but do you actually have msvcrt.lib?

Yes, I have that lib.

[kcvinu]

kcvinu, could you post your source code? There may be another way to do what you are trying to achieve.

I have asked that this thread be moved to the Campus...

Sure. This is my code.

Code Select Expand

.code
main proc
    mov rax, 125
    ret
main endp

end

[zedd151]

Sure. This is my code.

Code Select Expand

.code
main proc
    mov rax, 125
    ret
main endp

end

if that is your entire code, you don't need msvcrt.lib for that.

Yes, I have that lib.

what is the path to it, where is it located?

[NoCforMe]

Sure. This is my code.

Code Select Expand

.code
main proc
    mov rax, 125
    ret
main endp

end

if that is your entire code, you don't need msvcrt.lib for that.

What he wrote.

Since you definitely do not need that library to assemble and link that code, just remove the reference to msvcrt.lib for now. Worry about that later ...

One thing, though: I believe you need to set the program's entry point. (You definitely need to do this for 32-bit code, and I assume the same for 64-bit code.)

Code Select Expand

.code
main proc
start:
    mov rax, 125
    ret
main endp

end start


[kcvinu]

what is the path to it, where is it located?
[/quote]

That file resides more than one place
One location is this - C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.38.33130\lib\x64\msvcrt.lib

[kcvinu]

Sure. This is my code.

Code Select Expand

.code
main proc
    mov rax, 125
    ret
main endp

end

if that is your entire code, you don't need msvcrt.lib for that.

What he wrote.

Since you definitely do not need that library to assemble and link that code, just remove the reference to msvcrt.lib for now. Worry about that later ...

One thing, though: I believe you need to set the program's entry point. (You definitely need to do this for 32-bit code, and I assume the same for 64-bit code.)

Code Select Expand

.code
main proc
start:
    mov rax, 125
    ret
main endp

end start


Thanks for the reply. Let me try that.

[sinsi]

Sure. This is my code.

Code Select Expand

.code
main proc
    mov rax, 125
    ret
main endp

end

if that is your entire code, you don't need msvcrt.lib for that.

What he wrote.

Since you definitely do not need that library to assemble and link that code, just remove the reference to msvcrt.lib for now. Worry about that later ...

One thing, though: I believe you need to set the program's entry point. (You definitely need to do this for 32-bit code, and I assume the same for 64-bit code.)

Code Select Expand

.code
main proc
start:
    mov rax, 125
    ret
main endp

end start


In 64-bit code, using ML64, end start will actually throw an error.

Code Select Expand

Microsoft (R) Macro Assembler (x64) Version 14.40.33811.0
Copyright (C) Microsoft Corporation.  All rights reserved.

 Assembling: C:\masm32\crap.asm
C:\masm32\crap.asm(5) : error A2008:syntax error : start
C:\masm32\crap.asm(5) : error A2088:END directive required at end of file


[zedd151]

In 64-bit code, using ML64, end start will actually throw an error.

Quite right. Plus you need to tell link.exe the entry point that you are using example

Code Select Expand

  /ENTRY:<label_name> if different than the "C" default entry point (WinMainCRTStartup or whatever it is, I cannot remember offhand), else link will give an error message indicating the entry point cannot be found.

In your link switches for your example code posted above, add "/ENTRY:main"...

[NoCforMe]

In 64-bit code, using ML64, end start will actually throw an error.

Code Select Expand

Microsoft (R) Macro Assembler (x64) Version 14.40.33811.0
Copyright (C) Microsoft Corporation.  All rights reserved.

 Assembling: C:\masm32\crap.asm
C:\masm32\crap.asm(5) : error A2008:syntax error : start
C:\masm32\crap.asm(5) : error A2088:END directive required at end of file


But why the error for having start: there? Isn't it legal to have a label in your code? or is there something special about "start"?

(I do now understand that the setting-the-entry-point thing is different from 32-bit code.)

[kcvinu]

In your link switches for your example code posted above, add "/ENTRY:main"...

Thanks. Let me try.