fatal error C1060: compiler is out of heap space (again)
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@Christian-Ehrlicher I am using a 64-bit compiler. Compiling for 64-bit executable.
@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?Qt Online Installer direct download: https://download.qt.io/official_releases/online_installers/
Visit the Qt Academy at https://academy.qt.io/catalog -
If you compile in release mode, do you still get the same compiler error?
(Also, when compiling in debug mode, try removing that -FS option.)@hskoglund I get the same errors in Release mode.
The "/FS" is generated by Qt, not sure how to suppress it.
"/FS-"? -
@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?@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)
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@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?@Christian-Ehrlicher Here's the output from "vswhere":
instanceId: 1b580a97 installDate: 12 Apr 2025 9:53:45 AM installationName: VisualStudio/15.9.78+36631.12 installationPath: C:\Program Files (x86)\Microsoft Visual Studio\2017\Professional installationVersion: 15.9.36631.12 productId: Microsoft.VisualStudio.Product.Professional productPath: C:\Program Files (x86)\Microsoft Visual Studio\2017\Professional\Common7\IDE\devenv.exe state: 7 isComplete: 0 isLaunchable: 1 isPrerelease: 0 isRebootRequired: 0 displayName: Visual Studio Professional 2017 description: Professional developer tools and services for small teams channelId: VisualStudio.15.Release channelUri: https://aka.ms/vs/15/release/channel enginePath: C:\Program Files (x86)\Microsoft Visual Studio\Installer\resources\app\ServiceHub\Services\Microsoft.VisualStudio.Setup.Service installChannelUri: https://aka.ms/vs/15/release/0e24fba09_-593026118/channel installedChannelId: VisualStudio.15.Release installedChannelUri: https://aka.ms/vs/15/release/channel releaseNotes: https://go.microsoft.com/fwlink/?LinkId=660692#15.9.78 resolvedInstallationPath: C:\Program Files (x86)\Microsoft Visual Studio\2017\Professional thirdPartyNotices: https://go.microsoft.com/fwlink/?LinkId=660708 updateDate: 2026-01-07T12:09:16.4473894Z catalog_buildBranch: d15.9 catalog_buildVersion: 15.9.36631.12 catalog_id: VisualStudio/15.9.78+36631.12 catalog_localBuild: build-lab catalog_manifestName: VisualStudio catalog_manifestType: installer catalog_productDisplayVersion: 15.9.78 catalog_productLine: Dev15 catalog_productLineVersion: 2017 catalog_productMilestone: RTW catalog_productMilestoneIsPreRelease: False catalog_productName: Visual Studio catalog_productPatchVersion: 78 catalog_productPreReleaseMilestoneSuffix: 1.0 catalog_productRelease: RTW catalog_productSemanticVersion: 15.9.78+36631.12 catalog_requiredEngineVersion: 1.18.1063.29791 properties_appLocalWPF: false properties_campaignId: properties_channelManifestId: VisualStudio.15.Release/15.9.78+36631.12 properties_includeRecommended: 0 properties_nickname: properties_setupEngineFilePath: C:\Program Files (x86)\Microsoft Visual Studio\Installer\setup.exe instanceId: 6e3ad4c1 installDate: 15 Dec 2024 11:42:02 AM installationName: VisualStudio/16.11.42+35425.106 installationPath: C:\Program Files (x86)\Microsoft Visual Studio\2019\Community installationVersion: 16.11.35425.106 productId: Microsoft.VisualStudio.Product.Community productPath: C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\Common7\IDE\devenv.exe state: 4294967295 isComplete: 1 isLaunchable: 1 isPrerelease: 0 isRebootRequired: 0 displayName: Visual Studio Community 2019 description: Powerful IDE, free for students, open-source contributors, and individuals channelId: VisualStudio.16.Release channelUri: https://aka.ms/vs/16/release/channel enginePath: C:\Program Files (x86)\Microsoft Visual Studio\Installer\resources\app\ServiceHub\Services\Microsoft.VisualStudio.Setup.Service installedChannelId: VisualStudio.16.Release installedChannelUri: https://aka.ms/vs/16/release/channel releaseNotes: https://docs.microsoft.com/en-us/visualstudio/releases/2019/release-notes-v16.11#16.11.42 resolvedInstallationPath: C:\Program Files (x86)\Microsoft Visual Studio\2019\Community thirdPartyNotices: https://go.microsoft.com/fwlink/?LinkId=660909 updateDate: 2024-12-15T15:42:02.8085868Z catalog_buildBranch: d16.11 catalog_buildVersion: 16.11.35425.106 catalog_id: VisualStudio/16.11.42+35425.106 catalog_localBuild: build-lab catalog_manifestName: VisualStudio catalog_manifestType: installer catalog_productDisplayVersion: 16.11.42 catalog_productLine: Dev16 catalog_productLineVersion: 2019 catalog_productMilestone: RTW catalog_productMilestoneIsPreRelease: False catalog_productName: Visual Studio catalog_productPatchVersion: 42 catalog_productPreReleaseMilestoneSuffix: 1.0 catalog_productSemanticVersion: 16.11.42+35425.106 catalog_requiredEngineVersion: 2.11.72.18200 properties_campaignId: properties_channelManifestId: VisualStudio.16.Release/16.11.42+35425.106 properties_includeRecommended: 0 properties_nickname: properties_setupEngineFilePath: C:\Program Files (x86)\Microsoft Visual Studio\Installer\setup.exe instanceId: a3aac630 installDate: 03 Jul 2024 6:57:14 PM installationName: VisualStudio/17.13.6+35931.197 installationPath: C:\Program Files\Microsoft Visual Studio\2022\Community installationVersion: 17.13.35931.197 productId: Microsoft.VisualStudio.Product.Community productPath: C:\Program Files\Microsoft Visual Studio\2022\Community\Common7\IDE\devenv.exe state: 4294967295 isComplete: 1 isLaunchable: 1 isPrerelease: 0 isRebootRequired: 0 displayName: Visual Studio Community 2022 description: Powerful IDE, free for students, open-source contributors, and individuals channelId: VisualStudio.17.Release channelUri: https://aka.ms/vs/17/release/channel enginePath: C:\Program Files (x86)\Microsoft Visual Studio\Installer\resources\app\ServiceHub\Services\Microsoft.VisualStudio.Setup.Service installedChannelId: VisualStudio.17.Release installedChannelUri: https://aka.ms/vs/17/release/channel releaseNotes: https://docs.microsoft.com/en-us/visualstudio/releases/2022/release-notes-v17.13#17.13.6 resolvedInstallationPath: C:\Program Files\Microsoft Visual Studio\2022\Community thirdPartyNotices: https://go.microsoft.com/fwlink/?LinkId=661288 updateDate: 2025-04-10T19:20:01.9041268Z catalog_buildBranch: d17.13 catalog_buildVersion: 17.13.35931.197 catalog_id: VisualStudio/17.13.6+35931.197 catalog_localBuild: build-lab catalog_manifestName: VisualStudio catalog_manifestType: installer catalog_productDisplayVersion: 17.13.6 catalog_productLine: Dev17 catalog_productLineVersion: 2022 catalog_productMilestone: RTW catalog_productMilestoneIsPreRelease: False catalog_productName: Visual Studio catalog_productPatchVersion: 6 catalog_productPreReleaseMilestoneSuffix: 1.0 catalog_productSemanticVersion: 17.13.6+35931.197 catalog_requiredEngineVersion: 3.13.2069.59209 properties_campaignId: 3650:2f3f9e4bc13b4b84bacc669e2109a308 properties_channelManifestId: VisualStudio.17.Release/17.13.6+35931.197 properties_includeRecommended: 1 properties_nickname: properties_setupEngineFilePath: C:\Program Files (x86)\Microsoft Visual Studio\Installer\setup.exe instanceId: bd038e2e installDate: 12 Apr 2025 11:50:29 AM installationName: VisualStudio/15.9.78+36631.12 installationPath: C:\Program Files (x86)\Microsoft Visual Studio\2017\Community installationVersion: 15.9.36631.12 productId: Microsoft.VisualStudio.Product.Community productPath: C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\Common7\IDE\devenv.exe state: 4294967295 isComplete: 1 isLaunchable: 1 isPrerelease: 0 isRebootRequired: 0 displayName: Visual Studio Community 2017 description: Free, fully-featured IDE for students, open-source and individual developers channelId: VisualStudio.15.Release channelUri: https://aka.ms/vs/15/release/channel enginePath: C:\Program Files (x86)\Microsoft Visual Studio\Installer\resources\app\ServiceHub\Services\Microsoft.VisualStudio.Setup.Service installedChannelId: VisualStudio.15.Release installedChannelUri: https://aka.ms/vs/15/release/channel releaseNotes: https://go.microsoft.com/fwlink/?LinkId=660692#15.9.78 resolvedInstallationPath: C:\Program Files (x86)\Microsoft Visual Studio\2017\Community thirdPartyNotices: https://go.microsoft.com/fwlink/?LinkId=660708 updateDate: 2026-01-05T21:23:36.7680071Z catalog_buildBranch: d15.9 catalog_buildVersion: 15.9.36631.12 catalog_id: VisualStudio/15.9.78+36631.12 catalog_localBuild: build-lab catalog_manifestName: VisualStudio catalog_manifestType: installer catalog_productDisplayVersion: 15.9.78 catalog_productLine: Dev15 catalog_productLineVersion: 2017 catalog_productMilestone: RTW catalog_productMilestoneIsPreRelease: False catalog_productName: Visual Studio catalog_productPatchVersion: 78 catalog_productPreReleaseMilestoneSuffix: 1.0 catalog_productRelease: RTW catalog_productSemanticVersion: 15.9.78+36631.12 catalog_requiredEngineVersion: 1.18.1063.29791 properties_appLocalWPF: false properties_campaignId: properties_channelManifestId: VisualStudio.15.Release/15.9.78+36631.12 properties_includeRecommended: 0 properties_nickname: 2 properties_setupEngineFilePath: C:\Program Files (x86)\Microsoft Visual Studio\Installer\setup.exe -
@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?This post is deleted! -
Sorry I meant
where cl.exeQt Online Installer direct download: https://download.qt.io/official_releases/online_installers/
Visit the Qt Academy at https://academy.qt.io/catalog -
Sorry I meant
where cl.exewhere cl.exe INFO: Could not find files for the given pattern(s). -
Sorry I meant
where cl.exe@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?
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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.exeQt Online Installer direct download: https://download.qt.io/official_releases/online_installers/
Visit the Qt Academy at https://academy.qt.io/catalog -
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@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.
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@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.
@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.Qt Online Installer direct download: https://download.qt.io/official_releases/online_installers/
Visit the Qt Academy at https://academy.qt.io/catalog -
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.exeTwo 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
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@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.@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. -
@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.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.
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S Sprezzatura has marked this topic as solved on
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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 -
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@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 } -
Interesting update: I got the error again, appearing at random after days of successful compilation.
I terminated Firefox, the problem went away!
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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).
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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).
@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? :)
