<![CDATA[fatal error C1060: compiler is out of heap space (again)]]>I'm converting a project that compiles without error under Qt 5, to Qt 6. I'm getting the

Compiler out of heap space

error.
I've researched the other posts about this error, and they don't fix the problem.
I've added "/Zm2000" to the compiler options. No go.
This error does not occur when compiling with Qt 5.
It fails with VS 2019 and VS 2022, Qt 6.6, and Qt 6.9.
There are no egregiously large .CPP files. The largest .CPP source file is 141KB or 4,412 lines.
The .QRC file includes fifteen .PNG files totalling 176KB.
I have 32GB of RAM.

Any suggestions?

]]>https://forum.qt.io/topic/164101/fatal-error-c1060-compiler-is-out-of-heap-space-againRSS for NodeSat, 18 Apr 2026 01:20:22 GMTFri, 16 Jan 2026 21:32:42 GMT60<![CDATA[Reply to fatal error C1060: compiler is out of heap space (again) on Tue, 17 Mar 2026 17:23:32 GMT]]>@Christian-Ehrlicher

Good news! It's working!

The solution was to upgrade from VS 2022 ver. 17.13, to ver. 17.14.
I tried getting VS to update itself, but it locked up and wiped itself. I had to download and re-install VS 17.14.

Here's the kicker: I got the suggestion from OpenAI/ChatGPT!

I'm an AI skeptic, but I have to give credit where it's due.

Also, ChatGPT suggested "-bigobj", but that didn't make a difference.

A sincere thanks to Christian and hskoglund from a 77-year old, half-blind hack :o)

Update 17 Mar 2026: The problem reoccurs every few days. Solution is to kill memory hogs until it works: Firefox, Chrome, Thunderbird, Teams, Adobe, whatever.

]]>https://forum.qt.io/post/835509https://forum.qt.io/post/835509Tue, 17 Mar 2026 17:23:32 GMT<![CDATA[Reply to fatal error C1060: compiler is out of heap space (again) on Thu, 26 Feb 2026 19:02:23 GMT]]>Figured it out! For visual studio,

Go to Project properties -> Advanced (left menu) -> Preferred Build Tool Architecture. It'll be set to Default, which is x86. Set it to x64

now no more compiler is out of heap space error. More Info

]]>https://forum.qt.io/post/836617https://forum.qt.io/post/836617Thu, 26 Feb 2026 19:02:23 GMT<![CDATA[Reply to fatal error C1060: compiler is out of heap space (again) on Thu, 26 Feb 2026 18:30:29 GMT]]>In my case its a large resource file. I can make it work when I enable Two-Pass in Qt Resource compiler but sometimes it fails with error <resourcefilename> object file not found. So trying to make it work without Two-Pass enabled.

]]>https://forum.qt.io/post/836616https://forum.qt.io/post/836616Thu, 26 Feb 2026 18:30:29 GMT<![CDATA[Reply to fatal error C1060: compiler is out of heap space (again) on Thu, 26 Feb 2026 17:09:51 GMT]]>seem like you all are trying to treat the symptom and not the underlying cause. these types of problems are often the result of an #include that is cyclic because it does not have a proper macro guard around it. It is always much more convenient to blame the "out of date" toolchain, when in reality the problems are usually PEBCAK (problem exists between chain and keyboard) ;^)

Anyway, if it were my assignment I'd be looking for programmatic problems instead of toolchain issues.

]]>https://forum.qt.io/post/836613https://forum.qt.io/post/836613Thu, 26 Feb 2026 17:09:51 GMT<![CDATA[Reply to fatal error C1060: compiler is out of heap space (again) on Thu, 26 Feb 2026 15:58:36 GMT]]>@Christian-Ehrlicher said in fatal error C1060: compiler is out of heap space (again):

@Sprezzatura said in fatal error C1060: compiler is out of heap space (again):

Any suggestions?

Use a 64bit compiler even when you compile for 32bits.

I'm running into this error while compiling a large resource file (it has a single large resource). How do I check if my project is using 64-bit compiler on VS2026? fyi, my app is 32-bit

]]>https://forum.qt.io/post/836609https://forum.qt.io/post/836609Thu, 26 Feb 2026 15:58:36 GMT<![CDATA[Reply to fatal error C1060: compiler is out of heap space (again) on Fri, 20 Feb 2026 09:22:49 GMT]]>@Sprezzatura I had the same problem. I have 3 simultaneous Visual Studio 2022 instances and Firefox with a lot of processes and huge memory usage. Another way to solve this is to limit the number of processors used to compile the solution as it will use less memory due less parallel compilation : Tools > Options > Project and solutions > Compilation and execution > Max number of parallel compilations ---> set it to a lower value.

]]>https://forum.qt.io/post/836446https://forum.qt.io/post/836446Fri, 20 Feb 2026 09:22:49 GMT<![CDATA[Reply to fatal error C1060: compiler is out of heap space (again) on Fri, 20 Feb 2026 08:10:37 GMT]]>@SimonSchroeder said in fatal error C1060: compiler is out of heap space (again):

BTW, does anybody know something like a little widget for Windows 11 that shows committed memory? I would like to have an eye on this.

Can't you write this yourself with Qt? :)

]]>https://forum.qt.io/post/836441https://forum.qt.io/post/836441Fri, 20 Feb 2026 08:10:37 GMT<![CDATA[Reply to fatal error C1060: compiler is out of heap space (again) on Fri, 20 Feb 2026 08:00:21 GMT]]>I occasionally have this problem, too. Here's what I have figured out: The task manager shows memory "in use" and "committed" memory. It's the committed memory that is of importance: Committed memory means that through allocations this amount of memory has been promised to some software, but the corresponding memory pages have not been accessed, yet (which is why memory "in use" can be lower). The reason why this memory is not available is because it was already allocated. This means that committed memory must be available at any time (because it is after allocation the program cannot figure out anymore that it would not have this memory, so it must be there). Once the committed memory is full, nothing works anymore (even when memory "in use" shows that you still have 32 GB left). This is why closing Firefox (which usually uses up a lot of memory) helped. Rebooting your computer also helps.

Basically, "memory in use" is a useless metric in Windows 11. The only thing that matters is committed memory. (You can find programs that use a lot of committed memory if you select "Details" on the left pane of the task manager.)

BTW, does anybody know something like a little widget for Windows 11 that shows committed memory? I would like to have an eye on this. Otherwise Windows will reboot like every other week or so because it ran out of memory (while memory "in use" still shows 32 GB left).

]]>https://forum.qt.io/post/836440https://forum.qt.io/post/836440Fri, 20 Feb 2026 08:00:21 GMT<![CDATA[Reply to fatal error C1060: compiler is out of heap space (again) on Thu, 19 Feb 2026 20:16:22 GMT]]>Interesting update: I got the error again, appearing at random after days of successful compilation.

I terminated Firefox, the problem went away!

]]>https://forum.qt.io/post/836437https://forum.qt.io/post/836437Thu, 19 Feb 2026 20:16:22 GMT<![CDATA[Reply to fatal error C1060: compiler is out of heap space (again) on Mon, 19 Jan 2026 13:39:44 GMT]]>@SimonSchroeder I do have that included:

versionAtLeast(QT_VERSION, 6.0.0) {
	CONFIG += c++17	# Fails with Qt 5.13 
	QMAKE_CFLAGS += -std:c++17                 # required for Qt 6
}
]]>https://forum.qt.io/post/835527https://forum.qt.io/post/835527Mon, 19 Jan 2026 13:39:44 GMT<![CDATA[Reply to fatal error C1060: compiler is out of heap space (again) on Mon, 19 Jan 2026 08:06:11 GMT]]>Just as an aside (since I'm a little late to the party): You should turn on C++17 in the .pro file with the line

CONFIG += c++17
]]>https://forum.qt.io/post/835519https://forum.qt.io/post/835519Mon, 19 Jan 2026 08:06:11 GMT<![CDATA[Reply to fatal error C1060: compiler is out of heap space (again) on Tue, 17 Mar 2026 17:23:32 GMT]]>@Christian-Ehrlicher

Good news! It's working!

The solution was to upgrade from VS 2022 ver. 17.13, to ver. 17.14.
I tried getting VS to update itself, but it locked up and wiped itself. I had to download and re-install VS 17.14.

Here's the kicker: I got the suggestion from OpenAI/ChatGPT!

I'm an AI skeptic, but I have to give credit where it's due.

Also, ChatGPT suggested "-bigobj", but that didn't make a difference.

A sincere thanks to Christian and hskoglund from a 77-year old, half-blind hack :o)

Update 17 Mar 2026: The problem reoccurs every few days. Solution is to kill memory hogs until it works: Firefox, Chrome, Thunderbird, Teams, Adobe, whatever.

]]>https://forum.qt.io/post/835509https://forum.qt.io/post/835509Tue, 17 Mar 2026 17:23:32 GMT<![CDATA[Reply to fatal error C1060: compiler is out of heap space (again) on Sun, 18 Jan 2026 15:53:04 GMT]]>@Christian-Ehrlicher I'm not launching this from the command line. I'm using Qt Creator, which automatically creates a stream of commands, including launching cl.exe, followed by a ton of parameters.
The output appears in the "Compile Output" window of the Qt Creator IDE.

]]>https://forum.qt.io/post/835507https://forum.qt.io/post/835507Sun, 18 Jan 2026 15:53:04 GMT<![CDATA[Reply to fatal error C1060: compiler is out of heap space (again) on Sun, 18 Jan 2026 13:39:54 GMT]]>In my VS2002 installation there are 4 different cl.exe versions:
c:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.43.34808\bin\Hostx86\x86\cl.exe
c:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.43.34808\bin\Hostx86\x64\cl.exe
c:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.43.34808\bin\Hostx64\x86\cl.exe
c:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.43.34808\bin\Hostx64\x64\cl.exe

Two of them (the ..\Hostx86\x64\cl.exe and the ..\Hostx64\x64\cl.exe will show the same output:
"Microsoft (R) C/C++ Optimizing Compiler Version 19.43.34810 for x64" and both will compile and build 64 bit ..exe files for Qt6.

So you have a 50% chance of running the correct compiler, i.e. the cl.exe in the subdirectory ..\Hostx64\x64

]]>https://forum.qt.io/post/835506https://forum.qt.io/post/835506Sun, 18 Jan 2026 13:39:54 GMT<![CDATA[Reply to fatal error C1060: compiler is out of heap space (again) on Sun, 18 Jan 2026 12:20:56 GMT]]>@Sprezzatura said in fatal error C1060: compiler is out of heap space (again):

where cl
INFO: Could not find files for the given pattern(s).

Again: execute this on the command line where you also compiled your Qt. Execatly where you did 'cl -nologo'
You are using a 32bit compiler which creates 64 bit executables. Or you have very low ram on your system which I doubt.

]]>https://forum.qt.io/post/835504https://forum.qt.io/post/835504Sun, 18 Jan 2026 12:20:56 GMT<![CDATA[Reply to fatal error C1060: compiler is out of heap space (again) on Sun, 18 Jan 2026 12:11:51 GMT]]>@Christian-Ehrlicher
[1] Here's what is displayed in the Compile Output window when I delete the "-nologo" option:

Microsoft (R) C/C++ Optimizing Compiler Version 19.43.34810 for x64
Copyright (C) Microsoft Corporation.  All rights reserved.

Note the "x64".

[2] My .PRO file contains:

contains(QT_ARCH, i386) {
    message("32-bit" $$QT_ARCH $$QT_VERSION)
}
contains(QT_ARCH, x86_64) {
    message("64-bit" $$QT_ARCH $$QT_VERSION)
}

This is displayed in the Compile Output window:

Project MESSAGE: 64-bit x86_64 6.9.0

[3] I tried creating a new Kit and adding a 32-bit compiler. Qt flat out rejected it.

[4] What does the "λ" lambda mean in your example?
When you say "the console where you build your Qt", do you mean the Terminal window in Qt Creator?
When I do that, I get:

>where cl
INFO: Could not find files for the given pattern(s).

I'm using Windows.

]]>https://forum.qt.io/post/835503https://forum.qt.io/post/835503Sun, 18 Jan 2026 12:11:51 GMT<![CDATA[Reply to fatal error C1060: compiler is out of heap space (again) on Sun, 18 Jan 2026 09:41:18 GMT]]>You have to call it in the console where you build you Qt... you are using a 32bit compiler.

λ where cl
C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.44.35207\bin\Hostx64\x64\cl.exe
]]>https://forum.qt.io/post/835500https://forum.qt.io/post/835500Sun, 18 Jan 2026 09:41:18 GMT<![CDATA[Reply to fatal error C1060: compiler is out of heap space (again) on Sat, 17 Jan 2026 21:35:35 GMT]]>@Christian-Ehrlicher I've found the culprit. If I include the following in the .PRO file:

QMAKE_CFLAGS += -Zc:__cplusplus
QMAKE_CFLAGS += -permissive-

It compiles successfully with Qt 5.15
However, when I include this to the .PRO file:

QMAKE_CFLAGS += -std:c++17
QMAKE_CFLAGS += -Zc:__cplusplus
QMAKE_CFLAGS += -permissive-

even Qt 5.15 fails with the "Out of Heap Space" error.
If I remove this line and try to compile with Qt 6.9, I get:

QMAKE_CFLAGS += -std:c++17

"Qt requires a C++17 compiler, and a suitable value for __cplusplus. On MSVC, you must pass the /Zc:__cplusplus option to the compiler"

Why would this option cause the Out of Heap Space error? Are there other options I need to add?

]]>https://forum.qt.io/post/835497https://forum.qt.io/post/835497Sat, 17 Jan 2026 21:35:35 GMT<![CDATA[Reply to fatal error C1060: compiler is out of heap space (again) on Sat, 17 Jan 2026 20:50:33 GMT]]>@Christian-Ehrlicher

where cl.exe
INFO: Could not find files for the given pattern(s).
]]>https://forum.qt.io/post/835496https://forum.qt.io/post/835496Sat, 17 Jan 2026 20:50:33 GMT<![CDATA[Reply to fatal error C1060: compiler is out of heap space (again) on Sat, 17 Jan 2026 20:28:00 GMT]]>Sorry I meant where cl.exe

]]>https://forum.qt.io/post/835493https://forum.qt.io/post/835493Sat, 17 Jan 2026 20:28:00 GMT<![CDATA[Reply to fatal error C1060: compiler is out of heap space (again) on Sat, 17 Jan 2026 19:32:11 GMT]]>@Christian-Ehrlicher Here's the output from "vswhere":

instanceId: 1b580a97
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]]>https://forum.qt.io/post/835489https://forum.qt.io/post/835489Sat, 17 Jan 2026 19:32:11 GMT<![CDATA[Reply to fatal error C1060: compiler is out of heap space (again) on Sat, 17 Jan 2026 19:12:58 GMT]]>@Christian-Ehrlicher Not sure where to enter "where cl". The Terminal Window returns:

INFO: Could not find files for the given pattern(s)

The compiler I am using, according to the "Manake Kits" section, is:

Microsoft Visual C++ Compiler 17.12.35527.113 (amd64)

Not (x86), not (amd64_x86), not (x86_amd64), nor anything containing "arm".

To reiterate, it compiles successfully under Qt 5.15 + VS 2019.

BTW thank you for your help and patience :o)

]]>https://forum.qt.io/post/835488https://forum.qt.io/post/835488Sat, 17 Jan 2026 19:12:58 GMT<![CDATA[Reply to fatal error C1060: compiler is out of heap space (again) on Sat, 17 Jan 2026 19:03:21 GMT]]>@hskoglund I get the same errors in Release mode.

The "/FS" is generated by Qt, not sure how to suppress it.
"/FS-"?

]]>https://forum.qt.io/post/835487https://forum.qt.io/post/835487Sat, 17 Jan 2026 19:03:21 GMT<![CDATA[Reply to fatal error C1060: compiler is out of heap space (again) on Sat, 17 Jan 2026 18:41:27 GMT]]>@Sprezzatura said in fatal error C1060: compiler is out of heap space (again):

I am using a 64-bit compiler. Compiling for 64-bit executable.

Then you will not get this error.
What does 'where cl' prints out?

]]>https://forum.qt.io/post/835486https://forum.qt.io/post/835486Sat, 17 Jan 2026 18:41:27 GMT