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Old 11-17-2008, 10:52 PM   #1
willylinux
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Registered: Sep 2008
Posts: 4

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Compiler Fedora9 Kernel issue


Dear All:
I compiler Kernel in the Fedora9 O.S,but I got undefined reference to `__umoddi3'
,this error message

and I search google,I edit Makefile file as below:

CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
-fno-strict-aliasing -fno-common

change to:

CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
-fno-strict-aliasing -fno-common \
-fno-tree-scev-cprop

and then I recompiler kernel again,It is working,

So anybody can tell me why???,it is recompiler working

thanks a lot
 
Old 11-18-2008, 05:39 PM   #2
Mara
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Registered: Feb 2002
Location: Grenoble
Distribution: Debian
Posts: 9,696

Rep: Reputation: 232Reputation: 232Reputation: 232
As the archives say, in this case gcc changed a loop into a division (original: loop with substraction), while the code that makes the actual division wasn't delivered. With the added option, the compiler is forces to use a loop.

Not a very elegant solution, but works until it if fixed in either gcc or the kernel.
 
  


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