[Buildroot] buildroot host builds with g++

[Buildroot] buildroot host builds with g++

[Earthquake]

Hi,

building package for the host, ends with:
g++: error: /usr/bin/g++": No such file or directory

Building the same package for the target works....

Package mk for host build calls generic-package and host-generic-package.


Best regards,

Alex

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Re: [Buildroot] buildroot host builds with g++

[Peter Korsgaard]

>>>>> "Earthquake" == Earthquake  <earthquake.de@freenet.de> writes:

 > Hi,
 > building package for the host, ends with:
 > g++: error: /usr/bin/g++": No such file or directory

 > Building the same package for the target works....

 > Package mk for host build calls generic-package and host-generic-package.

This sounds like a Buildroot question rather than a Busybox one, so
please followup on the Buildroot list (buildroot@buildroot.org).

With that said, if your package is written in C++ and you try to build
it for the host, then you need a C++ compiler on your host, but please
provide some more details about what exactly you are trying to do.

-- 
Bye, Peter Korsgaard
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Re: [Buildroot] buildroot host builds with g++

[Alex]

Hi,

I created a target package for ACE(+TAO).
 From the package I need the Idl compiler for the host.
Therefore I created a host makefile for building the IDL compiler (just 
the idl compiler (with static option...)).

So, if I build the idl compiler for the target, compile is successfull. 
(make with TARGET_CONFIGURE_OPTS)
But buiding for the host (make with HOST_CONFIGURE_OPTS) the build fails 
with

  g++: error: /usr/bin/g++": No such file or directory

In buildroot-config, BR2_TOOLCHAIN_BUILDROOT_CXX is set.

So how can I get a g++ for host building?


Best regards,

Alex


>   > Hi,
>   > building package for the host, ends with:
>   > g++: error: /usr/bin/g++": No such file or directory
>
>   > Building the same package for the target works....
>
>   > Package mk for host build calls generic-package and host-generic-package.
>
> This sounds like a Buildroot question rather than a Busybox one, so
> please followup on the Buildroot list (buildroot@buildroot.org).
>
> With that said, if your package is written in C++ and you try to build
> it for the host, then you need a C++ compiler on your host, but please
> provide some more details about what exactly you are trying to do.
>
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Re: [Buildroot] buildroot host builds with g++

[Peter Korsgaard]

>>>>> "Alex" == Alex  <earthquake.de@freenet.de> writes:

 > Hi,
 > I created a target package for ACE(+TAO).
 > From the package I need the Idl compiler for the host.
 > Therefore I created a host makefile for building the IDL compiler
 > (just the idl compiler (with static option...)).

 > So, if I build the idl compiler for the target, compile is
 > successfull. (make with TARGET_CONFIGURE_OPTS)
 > But buiding for the host (make with HOST_CONFIGURE_OPTS) the build
 > fails with

 >  g++: error: /usr/bin/g++": No such file or directory

 > In buildroot-config, BR2_TOOLCHAIN_BUILDROOT_CXX is set.

 > So how can I get a g++ for host building?

You need to instal g++ on your build machine.

-- 
Bye, Peter Korsgaard
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Re: [Buildroot] buildroot host builds with g++

[Alex]

Am 08.05.2022 um 11:06 schrieb Peter Korsgaard:
>>>>>> "Alex" == Alex  <earthquake.de@freenet.de> writes:
>   > Hi,
>   > I created a target package for ACE(+TAO).
>   > From the package I need the Idl compiler for the host.
>   > Therefore I created a host makefile for building the IDL compiler
>   > (just the idl compiler (with static option...)).
>
>   > So, if I build the idl compiler for the target, compile is
>   > successfull. (make with TARGET_CONFIGURE_OPTS)
>   > But buiding for the host (make with HOST_CONFIGURE_OPTS) the build
>   > fails with
>
>   >  g++: error: /usr/bin/g++": No such file or directory
>
>   > In buildroot-config, BR2_TOOLCHAIN_BUILDROOT_CXX is set.
>
>   > So how can I get a g++ for host building?
>
> You need to instal g++ on your build machine.

g++ is installed on my build machine where I create my buildroot system.
The project compiles outside of buildroot on my build machine.
Does buildroot environment need a link/variable to the g++ on the built 
machine?

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Re: [Buildroot] buildroot host builds with g++

[Peter Korsgaard]

>>>>> "Alex" == Alex  <earthquake.de@freenet.de> writes:

Hi,

 >> > So, if I build the idl compiler for the target, compile is
 >> > successfull. (make with TARGET_CONFIGURE_OPTS)
 >> > But buiding for the host (make with HOST_CONFIGURE_OPTS) the build
 >> > fails with
 >> 
 >> >  g++: error: /usr/bin/g++": No such file or directory
 >> 
 >> > In buildroot-config, BR2_TOOLCHAIN_BUILDROOT_CXX is set.
 >> 
 >> > So how can I get a g++ for host building?
 >> 
 >> You need to instal g++ on your build machine.

 > g++ is installed on my build machine where I create my buildroot system.
 > The project compiles outside of buildroot on my build machine.
 > Does buildroot environment need a link/variable to the g++ on the
 > built machine?

Are you sure? Based on the above, it doesn't sound like you have a
/usr/bin/g++?

-- 
Bye, Peter Korsgaard
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Re: [Buildroot] buildroot host builds with g++

[Alex]

Am 08.05.2022 um 21:25 schrieb Peter Korsgaard:
>>>>>> "Alex" == Alex  <earthquake.de@freenet.de> writes:
> Hi,
>
>   >> > So, if I build the idl compiler for the target, compile is
>   >> > successfull. (make with TARGET_CONFIGURE_OPTS)
>   >> > But buiding for the host (make with HOST_CONFIGURE_OPTS) the build
>   >> > fails with
>   >>
>   >> >  g++: error: /usr/bin/g++": No such file or directory
>   >>
>   >> > In buildroot-config, BR2_TOOLCHAIN_BUILDROOT_CXX is set.
>   >>
>   >> > So how can I get a g++ for host building?
>   >>
>   >> You need to instal g++ on your build machine.
>
>   > g++ is installed on my build machine where I create my buildroot system.
>   > The project compiles outside of buildroot on my build machine.
>   > Does buildroot environment need a link/variable to the g++ on the
>   > built machine?
>
> Are you sure? Based on the above, it doesn't sound like you have a
> /usr/bin/g++?

Im sure: $>which g++
                 /usr/bin/g++

g++ is a link which points over etc/alternatives to 
/usr/bin/x86_64-linux-gnu-g++-7


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Re: [Buildroot] buildroot host builds with g++

[Peter Korsgaard]

>>>>> "Alex" == Alex  <earthquake.de@freenet.de> writes:

Hi,

 >> > g++ is installed on my build machine where I create my buildroot system.
 >> > The project compiles outside of buildroot on my build machine.
 >> > Does buildroot environment need a link/variable to the g++ on the
 >> > built machine?
 >> 
 >> Are you sure? Based on the above, it doesn't sound like you have a
 >> /usr/bin/g++?

 > Im sure: $>which g++
 >                 /usr/bin/g++

 > g++ is a link which points over etc/alternatives to
 > /usr/bin/x86_64-linux-gnu-g++-7

Ok, then you will need to look closer at the build system of that
package to understand what is going on. Perhaps it plays around with
LD_LIBRARY_PATH or similar?

-- 
Bye, Peter Korsgaard
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Re: [Buildroot] buildroot host builds with g++

[Alex]

Am 09.05.2022 um 08:50 schrieb Peter Korsgaard:
>>>>>> "Alex" == Alex  <earthquake.de@freenet.de> writes:
> Hi,
>
>   >> > g++ is installed on my build machine where I create my buildroot system.
>   >> > The project compiles outside of buildroot on my build machine.
>   >> > Does buildroot environment need a link/variable to the g++ on the
>   >> > built machine?
>   >>
>   >> Are you sure? Based on the above, it doesn't sound like you have a
>   >> /usr/bin/g++?
>
>   > Im sure: $>which g++
>   >                 /usr/bin/g++
>
>   > g++ is a link which points over etc/alternatives to
>   > /usr/bin/x86_64-linux-gnu-g++-7
>
> Ok, then you will need to look closer at the build system of that
> package to understand what is going on. Perhaps it plays around with
> LD_LIBRARY_PATH or similar?

Found the Problem,
g++ is available and is used correctly.
Problem is: the last build part (compile the files needed to build the 
executable, not for the libs) uses a define in the make call and set it 
like:
Outside of buildroot is set like: -DTAO_IDL_PREPROCESSOR=\"g++\"
Inside host building is set with: 
-DTAO_IDL_PREPROCESSOR=\"<myhome>/buildroot-2021.02.9/output/host/bin/ccache 
/usr/bin/g++\"

Passing that ends with g++: error: /usr/bin/g++": No such file or directory

Passing TAO_IDL_PREPROCESSOR with the buildroot host cxx compile will 
successfull finish.
Is there a variable specify the compilier with the complete path that i 
can pass to the define? (BTW: Is there an overview over all 
defined/available variables?)



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