Qbs profile confusion!

[eamoc]

Hi, newbie here
So I'm setting up my toolchain configuration as per:

https://doc.qt.io/qbs/configuring.html
I go:
➜ qbs setup-toolchains --detect
Trying to detect gcc...
Profile 'gcc' created for '/bin/gcc'.
Trying to detect clang...
Profile 'clang' created for '/bin/clang'.

I can list my profiles by doing:
➜ qbs config --list profiles
profiles.clang.cpp.toolchainInstallPath: "/bin"
profiles.clang.qbs.toolchain: ["clang", "llvm", "gcc"]
profiles.gcc.cpp.toolchainInstallPath: "/bin"
profiles.gcc.qbs.toolchain: "gcc"

Then I cd into an example project as instructed:
cd /usr/share/qtcreator/qbs/share/qbs/examples/helloworld-minimal

But when I go:
sudo qbs profile:gcc
Password:

I get this:

Build graph does not yet exist for configuration 'default'. Starting from scratch.
Resolving project for configuration default
ERROR: /usr/share/qtcreator/qbs/share/qbs/examples/helloworld-minimal/hello.qbs:53:1 Error while handling product 'HelloWorld-minimal':
/usr/share/qtcreator/qbs/share/qbs/examples/helloworld-minimal/hello.qbs:53:1 Profile 'gcc' does not exist.

Profile gcc does not exist, even though it does as per the above command:
➜ qbs config --list profiles

Am I missing something here or?

[aha_1980]

@eamoc why do you use sudo?

That will change your user profile and that is the reason your config is reset.

I strongly recommend against building software with sudo!

[eamoc]

I was using sudo because I couldn't figure out the error I was getting without it.
This is what I get otherwise
➜ qbs profile: "gcc" ( I also tried it with out quotes )
ERROR: Unexpected command line parameter 'gcc'.
Expected an assignment of the form <property>:<value>, profile:<profile-name> or config:<configuration-name>.

I'm new to qbs, so I figure I'm missing something trivial

[jsulm]

@eamoc I'm not a QBS expert, but maybe you just need to remove the space:

qbs profile:gcc

?

[eamoc]

@jsulm
wow, I never thought of that! ... ( sarcasm)

when I remove the space, I get a different error:

➜ qbs profile:gcc
WARNING: Failed to remove empty directory '/usr/share/qtcreator/qbs/share/qbs/examples/helloworld-minimal/default'.
ERROR: Cannot lock build graph file '/usr/share/qtcreator/qbs/share/qbs/examples/helloworld-minimal/default/default.bg': Failed to create directory.

There is no directory called default in there

[jsulm]

@eamoc That's because normal users do not have write access to /usr
You can try to copy this stuff to some directory you have write access to.

[eamoc]

@jsulm
Thats why I resorted to using sudo earlier.
Thanks for your reply

Eamonn