- Welcome to Pelles C forum.
Pelles C forum
News:
Download Pelles C here: http://www.pellesc.se
Recent posts
#21
Bug reports / Re: Maybe a optimization bug.
Last post by Vortex - April 14, 2026, 06:06:04 PMCompiling the code with the maximize speed option :
Disassembling the object module :
The first printf call should take a second parameter, edx pointint the value of i. Since this statement is missing, printf will print the random value stored by the register edx.
Code Select
#include <stdio.h>
int main(void)
{
int i=1, sum=0;
while (i<=100)
{
//printf("i=%d\n",i);
sum=sum+i;
i++;
}
printf("i=%d\n",i);
printf("sum=%d\n",sum);
return 0;
}Disassembling the object module :
Code Select
_text SEGMENT PARA 'CODE' ; section number 1
main PROC
sub rsp, 40 ; 0000 _ 48: 83. EC, 28
lea rcx, [@152] ; 0004 _ 48: 8D. 0D, 00000000(rel)
call printf ; 000B _ E8, 00000000(rel)
lea rcx, [@154] ; 0010 _ 48: 8D. 0D, 00000000(rel)
mov edx, 5050 ; 0017 _ BA, 000013BA
call printf ; 001C _ E8, 00000000(rel)
xor eax, eax ; 0021 _ 31. C0
add rsp, 40 ; 0023 _ 48: 83. C4, 28
ret ; 0027 _ C3
main ENDP
_text ENDS
.xdata SEGMENT ALIGN(8) 'CONST' ; section number 3
..?xdatasym1 label byte
db 01H, 04H, 01H, 00H, 04H, 42H, 00H, 00H ; 0000 _ .....B..
.xdata ENDS
.rdata SEGMENT PARA 'CONST' ; section number 4
@154 label byte
db 73H, 75H, 6DH, 3DH, 25H, 64H, 0AH, 00H ; 0000 _ sum=%d..
@152 label byte
db 69H, 3DH, 25H, 64H, 0AH, 00H ; 0008 _ i=%d..
.rdata ENDSThe first printf call should take a second parameter, edx pointint the value of i. Since this statement is missing, printf will print the random value stored by the register edx.
#22
General discussion / Re: Pelles C and Windows Defen...
Last post by Vortex - April 14, 2026, 05:53:10 PMHi italofutura,
Timo's suggestion is nice, Pelles C can work like a portable application. Do you have any chances to move temporarily your account to the Administrators group?
Timo's suggestion is nice, Pelles C can work like a portable application. Do you have any chances to move temporarily your account to the Administrators group?
#23
Bug reports / Re: Some fonts are missing fro...
Last post by John Z - April 14, 2026, 04:49:07 PMYou could be right, seems like it. Did you check windows settings, personalization, fonts ..... that would be definitive if it is not showing there.
You might try Microsoft Store and see if the font is available to be installed.
John Z
You might try Microsoft Store and see if the font is available to be installed.
John Z
#24
Bug reports / Re: Maybe a optimization bug.
Last post by John Z - April 14, 2026, 04:43:36 PMHi ander_cc,
A good lesson there similar to a lawyers credo "In Court don't ask a question if you don't already know the answer" the corollary to teaching, esp programing, is "In classroom don't use an example you haven't tested"
(half kidding you, no offense meant)
But seriously yes there have been, and are issues, with using the optimizations and extensive testing is always needed for these. I have many programs using optimizations successfully.
Perhaps Pelle can find the cause of this short program, meanwhile
Your program can use optimizations by using this 'fix':
volatile int i=1;
which, as I understand it inhibits the optimizer from making assumptions about i.
John Z
As an aside I would recommend not using any optimizations for teaching. Optimizing should be performed by the students learning programing.
Cheers,
A good lesson there similar to a lawyers credo "In Court don't ask a question if you don't already know the answer" the corollary to teaching, esp programing, is "In classroom don't use an example you haven't tested"
(half kidding you, no offense meant)But seriously yes there have been, and are issues, with using the optimizations and extensive testing is always needed for these. I have many programs using optimizations successfully.
Perhaps Pelle can find the cause of this short program, meanwhile
Your program can use optimizations by using this 'fix':
volatile int i=1;
which, as I understand it inhibits the optimizer from making assumptions about i.
John Z
As an aside I would recommend not using any optimizations for teaching. Optimizing should be performed by the students learning programing.
Cheers,
#25
Bug reports / Maybe a optimization bug.
Last post by ander_cc - April 14, 2026, 03:38:30 PMToday, I showed a sample code about while statement to my students. But got a error result. 
I think it might be a bug related to optimization. Because when I close optimization, I can get the right value.
Pelles C v14, Windows 11 pro Chinese (Samplify) 25H2
You cannot view this attachment.
I think it might be a bug related to optimization. Because when I close optimization, I can get the right value.
Pelles C v14, Windows 11 pro Chinese (Samplify) 25H2
You cannot view this attachment.
#26
Bug reports / Re: Some fonts are missing fro...
Last post by ander_cc - April 14, 2026, 03:28:05 PMQuote from: John Z on April 14, 2026, 01:55:09 PMHi ander_cc,I also try it in my laptop, it is Win11 Home 25h2, and a Win10 pc, but miss some fonts too. Maybe this issue is only related to the Windows Chinese Edition.
On my system the Cascadia fonts are there. See attachment.
Windows 11 Home 25H2, so seems they 'should' be there on Pro . . . it is not a Pelles IDE issue I think...
Try going to windows settings, personalization, fonts, then see what is there.
John Z
P.S. The title on the resource 9 file also shows 13 I believe
#27
Bug reports / Re: Some fonts are missing fro...
Last post by John Z - April 14, 2026, 01:55:09 PMHi ander_cc,
On my system the Cascadia fonts are there. See attachment.
Windows 11 Home 25H2, so seems they 'should' be there on Pro . . . it is not a Pelles IDE issue I think...
Try going to windows settings, personalization, fonts, then see what is there.
John Z
P.S. The title on the resource 9 file also shows 13 I believe
On my system the Cascadia fonts are there. See attachment.
Windows 11 Home 25H2, so seems they 'should' be there on Pro . . . it is not a Pelles IDE issue I think...
Try going to windows settings, personalization, fonts, then see what is there.
John Z
P.S. The title on the resource 9 file also shows 13 I believe
#28
General discussions / Re: Chinese Simplify translati...
Last post by John Z - April 14, 2026, 10:31:13 AMHi ander_cc,
Great!
Tip: To run multiple languages easily create a desktop shortcut for each language.
Here is an example shortcut target properties for Chinese:
C:\Program Files\PellesC_V14\Bin\poide.exe" /l 0004 <- Lower case L
This way switching languages is a matter of selecting the right shortcut.
John Z
Great!
Tip: To run multiple languages easily create a desktop shortcut for each language.
Here is an example shortcut target properties for Chinese:
C:\Program Files\PellesC_V14\Bin\poide.exe" /l 0004 <- Lower case L
This way switching languages is a matter of selecting the right shortcut.
John Z
#29
General discussion / Re: Pelles C and Windows Defen...
Last post by John Z - April 14, 2026, 10:18:28 AMHi italofutra,
Just in the rare case Timo's suggestion does not work -
If you are still having issues you might try to unblock it first and then install to a folder other than Program Files xxx. To unblock when downloading from the internet use the properties dialog see image. If you can't unblock on the chief's laptop then download the setup on your laptop then unblock it and put on a USB. Then try a standard install, or install to a 'user' folder.
John Z
Quote from: italofutura on April 14, 2026, 08:22:10 AMHi,
I tried to install Pelles C on my employer provided Windows 11 laptop. I do not have admin rights on this laptop.
when I try to install Pelles C a smart screen appears, but due to lack of administrator privileges, I cannot proceed.
Other software works. Is it because Pelles C binaries are not signed? If yes, why?
Just in the rare case Timo's suggestion does not work -
If you are still having issues you might try to unblock it first and then install to a folder other than Program Files xxx. To unblock when downloading from the internet use the properties dialog see image. If you can't unblock on the chief's laptop then download the setup on your laptop then unblock it and put on a USB. Then try a standard install, or install to a 'user' folder.
John Z
#30
General discussion / Re: Pelles C and Windows Defen...
Last post by italofutura - April 14, 2026, 09:31:07 AMNot a bad suggestion at all.
Normally for OpenWatcom V2, I decompress the executable with 7-zip. This is not possible with PellesC, but the principle is the same.
I will follow your solution.
Thank you.
Normally for OpenWatcom V2, I decompress the executable with 7-zip. This is not possible with PellesC, but the principle is the same.
I will follow your solution.
Thank you.