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Author Topic: 5.2: busybox dc erroneous output  (Read 3132 times)

Offline dentonlt

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5.2: busybox dc erroneous output
« on: March 28, 2014, 08:36:12 PM »
busybox dc runs, but its output is always the same (perhaps an error code value or just MAX): 6.05096e-270.

Try: 'dc 10 1 add p' or 'dc 10 100 div p'

Since this occurs in base, I expect it's going to be a problem until 5.3 at least the next 5.3rc.

Same problem on both 32-bit and Pure 64. -

DLT
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Offline bmarkus

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Re: 5.2: busybox dc erroneous output
« Reply #1 on: March 29, 2014, 01:05:39 AM »
I see the same in the x86. It works properly in piCore 5.2 on the Raspberry Pi.
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Offline curaga

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Re: 5.2: busybox dc erroneous output
« Reply #2 on: March 30, 2014, 05:04:23 AM »
It still happens in 1.22.1 too. Will check further.
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Offline Juanito

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Re: 5.2: busybox dc erroneous output
« Reply #3 on: March 30, 2014, 05:10:36 AM »
see above, it works with x86_64, but not x86...
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Offline bmarkus

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Re: 5.2: busybox dc erroneous output
« Reply #4 on: March 30, 2014, 05:38:22 AM »
Quote from: Juanito on March 30, 2014, 05:10:36 AM
see above, it works with x86_64, but not x86...

Didn't check the new one, but in my previous test build in 4.7.7 against eglibc an using the older GCC it is working.
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Béla
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Offline curaga

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Re: 5.2: busybox dc erroneous output
« Reply #5 on: March 31, 2014, 04:35:14 AM »
It turned out to be a GCC bug. I propose a rebuild of the current version on 4.x, to minimize any possible issues from a version upgrade at the same time.
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Offline Juanito

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Re: 5.2: busybox dc erroneous output
« Reply #6 on: March 31, 2014, 05:18:17 AM »
..strange that gcc-4.7.2 is used for both core and corepure64, but dc only fails with x86
« Last Edit: March 31, 2014, 05:21:49 AM by Juanito »
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Offline curaga

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Re: 5.2: busybox dc erroneous output
« Reply #7 on: March 31, 2014, 05:53:34 AM »
It's some combination of optimization that triggers it, so not seeing on another arch is expected.
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Offline bmarkus

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Re: 5.2: busybox dc erroneous output
« Reply #8 on: March 31, 2014, 05:54:50 AM »
Which GCC versions have this bug?
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Béla
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Offline curaga

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Re: 5.2: busybox dc erroneous output
« Reply #9 on: March 31, 2014, 11:27:47 AM »
I don't know exactly, beyond 4.7.2.
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