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CDT complains of missing host gcc and g++ for a cross-compile [message #1844954]

Thu, 30 September 2021 17:29

Tauno Voipio

Messages: 742
Registered: August 2014

Senior Member

I have a set-up without native C/C++ compilers, but with needed cross-compilers.

When creating a cross-compile project with properly set paths and prefixes to the compiler tools, the CDT complains of missing native compilers and refuses to do anything. Is this a bug?

index.php/fa/41053/0/

Attachment: Screenshot 2021-09-28 at 10.16.28.png
(Size: 40.39KB, Downloaded 732 times)

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Tauno Voipio

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Re: CDT complains of missing host gcc and g++ for a cross-compile [message #1844977 is a reply to message #1844954]

Fri, 01 October 2021 13:19

David Vavra

Messages: 1426
Registered: October 2012

Senior Member

Could be an attempt to get the compiler built-ins.
I altered the built-ins command and got something similar.
What's in the Location and Type fields?

index.php/fa/41060/0/

I also allocated a console for it and got [slightly edited]

florb -E -P -v -dD /home/dvavra/workspaces/2021-09/Passwords/
.metadata/.plugins/org.eclipse.cdt.managedbuilder.core/spec.cpp 
Cannot run program "florb": Unknown reason

Error: Program "florb" not found in PATH

Attachment: Scanner_2021-10-01_09-15-16.png
(Size: 16.54KB, Downloaded 666 times)

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Re: CDT complains of missing host gcc and g++ for a cross-compile [message #1844986 is a reply to message #1844977]

Fri, 01 October 2021 16:33

Tauno Voipio

Messages: 742
Registered: August 2014

Senior Member

Yes, it is.

I took the settings page and added the prefix to the command line and the complaints disappeared, but then the real compile commands got the prefixes in double. I cannot make the ends meet here.

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Tauno Voipio

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Re: CDT complains of missing host gcc and g++ for a cross-compile [message #1844988 is a reply to message #1844986]

Fri, 01 October 2021 17:15

David Vavra

Messages: 1426
Registered: October 2012

Senior Member

Not sure what you did.
Sounds like you changed the compiler in tool settings.
If so, maybe use the non-cross compile buiilt-in provider but
change its command to <prefix>-$(COMMAND)
or if there's a variable holding the prefix: $(<prefix var>)$(COMMAND)

You can do this locally for a project.

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Re: CDT complains of missing host gcc and g++ for a cross-compile [message #1844989 is a reply to message #1844988]

Fri, 01 October 2021 19:33

Tauno Voipio

Messages: 742
Registered: August 2014

Senior Member

I tried both. It got rid of the complaints, but destroyed compilation, as there is no arm-linux-gnueabihf-arm-linux-gnueabihf-gcc.

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Tauno Voipio

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Re: CDT complains of missing host gcc and g++ for a cross-compile [message #1844992 is a reply to message #1844989]

Sat, 02 October 2021 03:25

David Vavra

Messages: 1426
Registered: October 2012

Senior Member

I'm still confused about what you've done.
The built-ins provider uses the commands from the toolchain.
Including the path and prefix.

index.php/fa/41064/0/

For the g++ built-ins:

23:02:03 **** Running scanner discovery: CDT Cross GCC Built-in Compiler Settings ****
not-a-prefix-g++ -E -P -v -dD /home/dvavra/workspaces/2021-09/Passwords/.metadata/.plugins/org.eclipse.cdt.managedbuilder.core/spec.cpp 
Cannot run program "not-a-prefix-g++": Unknown reason

Error: Program "not-a-prefix-g++" not found in PATH
PATH=[/home/opt/ARM/gcc-arm-none-eabi-10-2020-q4-major/bin:/home/dvavra/bin:/home/dvavra/.local/bin:/opt/perl/5.34.0/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin]

I would think you are getting a double prefix because you altered the
toolchain compiler commands.

Such as when I changed the cross compile settings to
index.php/fa/41065/0/

and the compiler in the toolchain:
index.php/fa/41066/0/

I get:

23:20:14 **** Running scanner discovery: CDT Cross GCC Built-in Compiler Settings ****
not-a-real-prefix-some-other-prefix-g++ -E -P -v -dD /home/dvavra/workspaces/2021-09/Passwords/.metadata/.plugins/org.eclipse.cdt.managedbuilder.core/spec.cpp 
Cannot run program "not-a-real-prefix-some-other-prefix-g++": Unknown reason

Error: Program "not-a-real-prefix-some-other-prefix-g++" not found in PATH
PATH=[/opt/ARM/gcc-arm-none-eabi-10-2020-q4-major/bin:/home/dvavra/bin:/home/dvavra/.local/bin:/opt/perl/5.34.0/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin]

Attachment: CrossCompileSettings_2021-10-01_23-10-56.png
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Attachment: DoublePrefix-1_2021-10-01_23-21-37.png
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Attachment: DoublePrefix-2_2021-10-01_23-22-38.png
(Size: 16.21KB, Downloaded 639 times)

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Re: CDT complains of missing host gcc and g++ for a cross-compile [message #1844999 is a reply to message #1844992]

Sat, 02 October 2021 12:51

Tauno Voipio

Messages: 742
Registered: August 2014

Senior Member

Take fresh Kubuntu 20.04LTS with Raspbian toolkit in /opt/raspbian/. Note that neither gcc nor g++ are there.

index.php/fa/41071/0/

Select File -> New -> C/C++ Project, C Managed Build, name the project, select Hello World ANSI C and Cross GCC, three times Next. Set up cross compiler on the configuration screen (the toolkit is there):

index.php/fa/41072/0/

We get a fresh project with the error cross:

index.php/fa/41073/0/

Attachment: Screenshot 2021-10-02 at 15.43.34.png
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Attachment: Screenshot 2021-10-02 at 15.35.47.png
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Attachment: Screenshot 2021-10-02 at 15.37.13.png
(Size: 136.29KB, Downloaded 615 times)

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Tauno Voipio

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Re: CDT complains of missing host gcc and g++ for a cross-compile [message #1845005 is a reply to message #1844999]

Sat, 02 October 2021 14:11

David Vavra

Messages: 1426
Registered: October 2012

Senior Member

I found that the "normal" gcc built-in provider used with
the cross compile tool chain ignores the prefix and path.
You have to use the cross-compile provider.

Did you? You didn't show doing so.

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