RE: [ECOS] Target.ld

RE: [ECOS] Target.ld

[Meulendijks, J.]

Okee thanks. Now it works fine!

I have one athor question. When eCos configtool builds a configuration it builds
3 directories. One of them is _install, in this directory there's a map called
include and lib. In the lib map there's the file libtarget.a this contains the
eCos you just configured. But if you compile something like this:
powerpc-eabi-gcc -I/ecos-c/ecos-work/kernel_install/include twothreads.c
-L/ecos-c/ecos-work/kernel_install/lib/ -Ttarget.ld -nostdlib -o twothreads.exe

you also need the include directory. Why is this? The library file contains all
the functions needed, right?! Or am I confused here.

Thanks.
-----Original Message-----
From: Andrew Lunn [mailto:andrew@lunn.ch]
Sent: vrijdag 17 september 2004 11:37
To: Meulendijks, J.
Cc: 'ecos-discuss@sources.redhat.com'
Subject: Re: [ECOS] Target.ld


On Fri, Sep 17, 2004 at 11:02:25AM +0200, Meulendijks, J. wrote:
> When I use the following command:
> powerpc-eabi-gcc -I/ecos-c/ecos-work/kernel_install/include twothreads.c
> -L/ecos-c/ecos-work/kernel_install/lib/ -Ttarget.ld -nostdlib -o
twothreads.exe
> 
> I get the following output:
> /ecos-c/DOCUME~1/MeulenJ/LOCALS~1/Temp/cc50FydW.o: In function
`cyg_user_start':
> 
> /ecos-c/DOCUME~1/MeulenJ/LOCALS~1/Temp/cc50FydW.o(.text+0x20): undefined
referen
> ce to `printf'
> /ecos-c/DOCUME~1/MeulenJ/LOCALS~1/Temp/cc50FydW.o: In function
`simple_program':
> 
> /ecos-c/DOCUME~1/MeulenJ/LOCALS~1/Temp/cc50FydW.o(.text+0x100): undefined
refere
> nce to `printf'
> /ecos-c/DOCUME~1/MeulenJ/LOCALS~1/Temp/cc50FydW.o(.text+0x110): undefined
refere
> nce to `rand'
> /ecos-c/DOCUME~1/MeulenJ/LOCALS~1/Temp/cc50FydW.o(.text+0x160): undefined
refere
> nce to `printf'
> collect2: ld returned 1 exit status
> 
> Did I miss something?! The directory listed is not supposed to be used...

Its just a tempory directory gcc has placed the object file in. 

You are missing printf and rand. rand is part of CYGPKG_LIBC_STDLIB
and printf is in CYGPKG_LIBC_STDIO. Do you have these packages in your
configuration?

        Andrew

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Re: [ECOS] Target.ld

[Andrew Lunn]

On Fri, Sep 17, 2004 at 11:45:27AM +0200, Meulendijks, J. wrote:
> Okee thanks. Now it works fine!
> 

> I have one athor question. When eCos configtool builds a
> configuration it builds 3 directories. One of them is _install, in
> this directory there's a map called include and lib. In the lib map
> there's the file libtarget.a this contains the eCos you just
> configured. But if you compile something like this:

> powerpc-eabi-gcc -I/ecos-c/ecos-work/kernel_install/include twothreads.c
> -L/ecos-c/ecos-work/kernel_install/lib/ -Ttarget.ld -nostdlib -o twothreads.exe
 
> you also need the include directory. Why is this? The library file
> contains all the functions needed, right?! Or am I confused here.

This is a beginners C question. How does the compiler know that rand()
takes no parameters and return an int? How does it know that the
function time() takes one paramter of type time_t and returns a
time_t. What is a time_t anyway?

        Andrew

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Before posting, please read the FAQ: http://ecos.sourceware.org/fom/ecos
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Re: [ECOS] Target.ld

[Nick Garnett]

"Meulendijks, J." <Meulendijks@WT.TNO.NL> writes:

> Okee thanks. Now it works fine!
> 
> I have one athor question. When eCos configtool builds a configuration it builds
> 3 directories. One of them is _install, in this directory there's a map called
> include and lib. In the lib map there's the file libtarget.a this contains the
> eCos you just configured. But if you compile something like this:
> powerpc-eabi-gcc -I/ecos-c/ecos-work/kernel_install/include twothreads.c
> -L/ecos-c/ecos-work/kernel_install/lib/ -Ttarget.ld -nostdlib -o twothreads.exe
> 
> you also need the include directory. Why is this? The library file contains all
> the functions needed, right?! Or am I confused here.

You are confused :-)

You need the include files to supply the definitions when you compile
twothreads.c. Otherwise you would get a lot of undefined symbols. Try
taking the -I option out and see what happens.

-- 
Nick Garnett                    eCos Kernel Architect
http://www.ecoscentric.com/     The eCos and RedBoot experts


-- 
Before posting, please read the FAQ: http://ecos.sourceware.org/fom/ecos
and search the list archive: http://ecos.sourceware.org/ml/ecos-discuss

Re: [ECOS] Target.ld

[Andrew Lunn]

On Fri, Sep 17, 2004 at 11:02:25AM +0200, Meulendijks, J. wrote:
> When I use the following command:
> powerpc-eabi-gcc -I/ecos-c/ecos-work/kernel_install/include twothreads.c
> -L/ecos-c/ecos-work/kernel_install/lib/ -Ttarget.ld -nostdlib -o twothreads.exe
> 
> I get the following output:
> /ecos-c/DOCUME~1/MeulenJ/LOCALS~1/Temp/cc50FydW.o: In function `cyg_user_start':
> 
> /ecos-c/DOCUME~1/MeulenJ/LOCALS~1/Temp/cc50FydW.o(.text+0x20): undefined referen
> ce to `printf'
> /ecos-c/DOCUME~1/MeulenJ/LOCALS~1/Temp/cc50FydW.o: In function `simple_program':
> 
> /ecos-c/DOCUME~1/MeulenJ/LOCALS~1/Temp/cc50FydW.o(.text+0x100): undefined refere
> nce to `printf'
> /ecos-c/DOCUME~1/MeulenJ/LOCALS~1/Temp/cc50FydW.o(.text+0x110): undefined refere
> nce to `rand'
> /ecos-c/DOCUME~1/MeulenJ/LOCALS~1/Temp/cc50FydW.o(.text+0x160): undefined refere
> nce to `printf'
> collect2: ld returned 1 exit status
> 
> Did I miss something?! The directory listed is not supposed to be used...

Its just a tempory directory gcc has placed the object file in. 

You are missing printf and rand. rand is part of CYGPKG_LIBC_STDLIB
and printf is in CYGPKG_LIBC_STDIO. Do you have these packages in your
configuration?

        Andrew

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Before posting, please read the FAQ: http://ecos.sourceware.org/fom/ecos
and search the list archive: http://ecos.sourceware.org/ml/ecos-discuss

RE: [ECOS] Target.ld

[Meulendijks, J.]

When I use the following command:
powerpc-eabi-gcc -I/ecos-c/ecos-work/kernel_install/include twothreads.c
-L/ecos-c/ecos-work/kernel_install/lib/ -Ttarget.ld -nostdlib -o twothreads.exe

I get the following output:
/ecos-c/DOCUME~1/MeulenJ/LOCALS~1/Temp/cc50FydW.o: In function `cyg_user_start':

/ecos-c/DOCUME~1/MeulenJ/LOCALS~1/Temp/cc50FydW.o(.text+0x20): undefined referen
ce to `printf'
/ecos-c/DOCUME~1/MeulenJ/LOCALS~1/Temp/cc50FydW.o: In function `simple_program':

/ecos-c/DOCUME~1/MeulenJ/LOCALS~1/Temp/cc50FydW.o(.text+0x100): undefined refere
nce to `printf'
/ecos-c/DOCUME~1/MeulenJ/LOCALS~1/Temp/cc50FydW.o(.text+0x110): undefined refere
nce to `rand'
/ecos-c/DOCUME~1/MeulenJ/LOCALS~1/Temp/cc50FydW.o(.text+0x160): undefined refere
nce to `printf'
collect2: ld returned 1 exit status

Did I miss something?! The directory listed is not supposed to be used...

-----Original Message-----
From: Nick Garnett [mailto:nickg@ecoscentric.com]
Sent: donderdag 16 september 2004 11:07
To: Meulendijks, J.
Cc: 'ecos-discuss@sources.redhat.com'
Subject: Re: [ECOS] Target.ld


"Meulendijks, J." <Meulendijks@WT.TNO.NL> writes:

> When I use the following command:
> 
> powerpc-eabi-gcc -g -l/ecos-c/cygwin/EcosWork/kernel_install/include hello.c
> -l/ecos-c/cygwin/EcosWork/kernel_install/lib -Ttarget.ld -nostdlib

That commandline should probably read:

powerpc-eabi-gcc -g -I/ecos-c/cygwin/EcosWork/kernel_install/include hello.c
-L/ecos-c/cygwin/EcosWork/kernel_install/lib -Ttarget.ld -nostdlib

i.e. -I not -l for the include path, -L not -l for the library path.

-- 
Nick Garnett                    eCos Kernel Architect
http://www.ecoscentric.com/     The eCos and RedBoot experts

-- 
Before posting, please read the FAQ: http://ecos.sourceware.org/fom/ecos
and search the list archive: http://ecos.sourceware.org/ml/ecos-discuss

Re: [ECOS] Target.ld

[Nick Garnett]

"Meulendijks, J." <Meulendijks@WT.TNO.NL> writes:

> When I use the following command:
> 
> powerpc-eabi-gcc -g -l/ecos-c/cygwin/EcosWork/kernel_install/include hello.c
> -l/ecos-c/cygwin/EcosWork/kernel_install/lib -Ttarget.ld -nostdlib

That commandline should probably read:

powerpc-eabi-gcc -g -I/ecos-c/cygwin/EcosWork/kernel_install/include hello.c
-L/ecos-c/cygwin/EcosWork/kernel_install/lib -Ttarget.ld -nostdlib

i.e. -I not -l for the include path, -L not -l for the library path.

-- 
Nick Garnett                    eCos Kernel Architect
http://www.ecoscentric.com/     The eCos and RedBoot experts


-- 
Before posting, please read the FAQ: http://ecos.sourceware.org/fom/ecos
and search the list archive: http://ecos.sourceware.org/ml/ecos-discuss

[ECOS] Target.ld

[Meulendijks, J.]

When I use the following command:

powerpc-eabi-gcc -g -l/ecos-c/cygwin/EcosWork/kernel_install/include hello.c
-l/ecos-c/cygwin/EcosWork/kernel_install/lib -Ttarget.ld -nostdlib

I get the following output:

/opt/ecos/gnutools/POWERP~1/bin/../lib/gcc-lib/powerpc-eabi/3.2.1/../../../../po
werpc-eabi/bin/ld: cannot open linker script file target.ld: No such file or
directory
collect2: ld returned 1 exit status

But I don't see anything wrong. The target.ld file is located in
c:/cygwin/ecoswork/kernell_install/lib. And as far as I can see is this the same
as /ecos-c/cygwin/ecoswork/kernell_install/lib

Thanks in advance.

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