Linaro toolchain binary allowing soft-float?

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Joel (Xi Zhou) Zhou

31 Jul 2014 31 Jul '14

4:32 p.m.

Hi Linaro-toolchain team,

I notice that the Linaro toolchain binary only support hard-float. We have a platform which is ARMv7 based does not support VFP. Could you generate toolchain binary for ARmv7 that allows soft-float?

Thanks,

Joel

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Victor Chong

31 Jul 31 Jul

5:04 p.m.

Hi Joel,

Please refer to: https://wiki.linaro.org/WorkingGroups/ToolChain/FAQ#How_do_I_use_Linaro.27s_...

Thanks!

On Fri, Aug 1, 2014 at 1:32 AM, Joel (Xi Zhou) Zhou joel.zhou@broadcom.com wrote:

...

Hi Linaro-toolchain team,

I notice that the Linaro toolchain binary only support hard-float. We have a platform which is ARMv7 based does not support VFP.

Could you generate toolchain binary for ARmv7 that allows soft-float?

Thanks,

Joel

linaro-toolchain mailing list linaro-toolchain@lists.linaro.org http://lists.linaro.org/mailman/listinfo/linaro-toolchain

Joel (Xi Zhou) Zhou

5:18 p.m.

Victor,

...

From the wiki, it mentions that the soft float (multilib) configuration supported is armv4t.

If we build our own toolchain for soft-float support based on linaro gcc source, is it just a modification of toolchain configuration? Or it need heavy patch for thing like eglibc?

Thank you for quick response!

Joel

From: Victor Chong [mailto:victor.chong@linaro.org] Sent: Thursday, July 31, 2014 1:04 PM To: Joel (Xi Zhou) Zhou Cc: linaro-toolchain@lists.linaro.org Subject: Re: Linaro toolchain binary allowing soft-float?

Hi Joel,

Please refer to: https://wiki.linaro.org/WorkingGroups/ToolChain/FAQ#How_do_I_use_Linaro.27s_... Thanks!

On Fri, Aug 1, 2014 at 1:32 AM, Joel (Xi Zhou) Zhou <joel.zhou@broadcom.commailto:joel.zhou@broadcom.com> wrote: Hi Linaro-toolchain team,

I notice that the Linaro toolchain binary only support hard-float. We have a platform which is ARMv7 based does not support VFP. Could you generate toolchain binary for ARmv7 that allows soft-float?

Thanks,

Joel

_______________________________________________ linaro-toolchain mailing list linaro-toolchain@lists.linaro.orgmailto:linaro-toolchain@lists.linaro.org http://lists.linaro.org/mailman/listinfo/linaro-toolchain

Victor Chong

6:12 p.m.

Joel,

Although possibly not fully optimized, soft float configuration for armv4t should still run on armv7. To build your own, I think you'll have to patch the gcc source code to enable multilib (disabled by default) and build the C library twice and figure out a way to combine them. Not exactly sure of the exact process since it's not something we currently do or support.

Thanks!

On Fri, Aug 1, 2014 at 2:18 AM, Joel (Xi Zhou) Zhou joel.zhou@broadcom.com wrote:

...

Victor,

From the wiki, it mentions that the soft float (multilib) configuration supported is armv4t.

If we build our own toolchain for soft-float support based on linaro gcc source, is it just a modification of toolchain configuration? Or it need heavy patch for thing like eglibc?

Thank you for quick response!

Joel

*From:* Victor Chong [mailto:victor.chong@linaro.org] *Sent:* Thursday, July 31, 2014 1:04 PM *To:* Joel (Xi Zhou) Zhou *Cc:* linaro-toolchain@lists.linaro.org *Subject:* Re: Linaro toolchain binary allowing soft-float?

Hi Joel,

Please refer to:

https://wiki.linaro.org/WorkingGroups/ToolChain/FAQ#How_do_I_use_Linaro.27s_...

Thanks!

On Fri, Aug 1, 2014 at 1:32 AM, Joel (Xi Zhou) Zhou < joel.zhou@broadcom.com> wrote:

Hi Linaro-toolchain team,

I notice that the Linaro toolchain binary only support hard-float. We have a platform which is ARMv7 based does not support VFP.

Could you generate toolchain binary for ARmv7 that allows soft-float?

Thanks,

Joel

linaro-toolchain mailing list linaro-toolchain@lists.linaro.org http://lists.linaro.org/mailman/listinfo/linaro-toolchain

Joel (Xi Zhou) Zhou

6:27 p.m.

Victor,

Yes, the little endian tool chain support armv4t soft float. [joelz@git-rtp-01] $ arm-linux-gnueabihf-gcc --print-multi-lib .; arm-linux-gnueabi;@marm@march=armv4t@mfloat-abi=soft

But there is not armv4 support on armeb big endian toolchain. [joelz@ldt-joelz] $ arm-linux-gnueabihf-gcc --print-multi-lib .;

It looks like the only choice is to build our own toolchain. Any instruction to build multilib for armv4t?

Thanks!

Joel

From: Victor Chong [mailto:victor.chong@linaro.org] Sent: Thursday, July 31, 2014 2:12 PM To: Joel (Xi Zhou) Zhou Cc: linaro-toolchain@lists.linaro.org Subject: Re: Linaro toolchain binary allowing soft-float?

Joel, Although possibly not fully optimized, soft float configuration for armv4t should still run on armv7. To build your own, I think you'll have to patch the gcc source code to enable multilib (disabled by default) and build the C library twice and figure out a way to combine them. Not exactly sure of the exact process since it's not something we currently do or support. Thanks!

On Fri, Aug 1, 2014 at 2:18 AM, Joel (Xi Zhou) Zhou <joel.zhou@broadcom.commailto:joel.zhou@broadcom.com> wrote: Victor,

...

From the wiki, it mentions that the soft float (multilib) configuration supported is armv4t.

If we build our own toolchain for soft-float support based on linaro gcc source, is it just a modification of toolchain configuration? Or it need heavy patch for thing like eglibc?

Thank you for quick response!

Joel

From: Victor Chong [mailto:victor.chong@linaro.orgmailto:victor.chong@linaro.org] Sent: Thursday, July 31, 2014 1:04 PM To: Joel (Xi Zhou) Zhou Cc: linaro-toolchain@lists.linaro.orgmailto:linaro-toolchain@lists.linaro.org Subject: Re: Linaro toolchain binary allowing soft-float?

Hi Joel,

Please refer to: https://wiki.linaro.org/WorkingGroups/ToolChain/FAQ#How_do_I_use_Linaro.27s_... Thanks!

On Fri, Aug 1, 2014 at 1:32 AM, Joel (Xi Zhou) Zhou <joel.zhou@broadcom.commailto:joel.zhou@broadcom.com> wrote: Hi Linaro-toolchain team,

I notice that the Linaro toolchain binary only support hard-float. We have a platform which is ARMv7 based does not support VFP. Could you generate toolchain binary for ARmv7 that allows soft-float?

Thanks,

Joel

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Joel (Xi Zhou) Zhou
Victor Chong