gcc4.4.1 related doubt

[Jie Zhang]

On 03/26/2010 01:13 AM, Ian Lance Taylor wrote:
 > trisha yad<trisha1march@gmail.com>  writes:
 >
 >> I am attaching one sample program.
 >>
 >> 1. arm-linux-gnueabi-gcc -fno-optimize-sibling-calls -O0 test.c
 >> 2. arm-linux-gnueabi-gcc -fno-optimize-sibling-calls -O2 test.c
 >> arm-linux-gnueabi-nm of O0 is log1
 >> arm-linux-gnueabi-nm of O2 is log
 >>
 >>
 >> I am attaching o/p of command using option --save-temps i.e in file 
test.s
 >> arm-linux-gnueabi-gcc -fno-optimize-sibling-calls --save-temps -O2 
test.c
 >
 > I don't understand how the .c file you showed can produce the .s file
 > that you showed.  In the .c file, main calls ABC.  In the .s file, it
 > does not.  I don't see how the optimizer could remove that call.
 >
I cannot reproduce this issue from the attached source file either.

 > I do see the T.12 symbol in the assembler source.  However, I don't
 > know where it came from.  I don't see when I compile your C file with
 > a recent ARM gcc.
 >
It might come from compiler instantiating a function, i.e. T.12 is a 
clone of a function but with some parameters instantiated. Just my guess.

 > Can you explain why the T.12 symbol is a problem?
 >
I think it should not be a problem. T.12 is a local symbol, it can be 
stripped by strip with appropriate options.


-- 
Jie Zhang
CodeSourcery
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