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Re: Darwin -m64 results
- From: howarth at bromo dot msbb dot uc dot edu (Jack Howarth)
- To: mrs at apple dot com
- Cc: fortran at gcc dot gnu dot org, fxcoudert at gmail dot com, gcc at gcc dot gnu dot org, gkeating at apple dot com, howarth at bromo dot msbb dot uc dot edu
- Date: Sat, 19 Aug 2006 10:50:44 -0400 (EDT)
- Subject: Re: Darwin -m64 results
Mike,
I don't believe that this warning with "-O3 -m64 -g" is
due to the fortran compiler optimizing away the storage.
If I compile...
program test
integer i,j
common i
do j = 1,100
i=i+1
end do
end
I still see the warning "can't find atom for N_GSYM stabs i:G(0,3)"
and I would be surprised if the storage for "i" was being optimized
away. I did one other test using the test case of...
program test
integer i
common i
end
...with and without the common statement at both -m32 and -m64.
The resulting lines in assign.s introduced by the use of
the common section are identical in both -m32 and -m64 compiles...
--- assign.s.nocommon 2006-08-19 10:45:59.000000000 -0400
+++ assign.s 2006-08-19 10:46:19.000000000 -0400
@@ -18,6 +18,11 @@
.stabs "void:t(0,1)",128,0,0,0
Lscope1:
.stabs "",36,0,0,Lscope1-LFBB1
+.comm ___BLNK__,4
+ .stabs "__BLNK__:G(0,2)=s4i:(0,3)=r(0,3);-2147483648;2147483647;,0,32;;",32,0,3,0
+ .stabs "int4:t(0,3)",128,0,0,0
+ .stabs "__BLNK__:G(0,2)",32,0,3,0
+ .stabs "i:G(0,3)",32,0,4,0
.stabs "",100,0,0,Letext0
Letext0:
.section __TEXT,__picsymbolstub1,symbol_stubs,pure_instructions,32
...however only the ld64 linker issues the "can't find atom for N_GSYM stabs i:G(0,3)"
complaint. I think this suggests a bug in ld64, no?
Jack