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</head><body bgcolor="#FFFFFF" text="#000000">If it thinks the symbol is
in the BSS section, then it should never have tried to use .comm to
emit it I think. <br>
<br>
On x86 it does not try to mix and match, which is why it works. AFAIK
comm symbols are regarded as having no section, rather than being bss,
so I think it's a bug in whatever code printed that .comm statement.<br>
<br>
I'll look into this tomorrow.<br>
<br>
<blockquote style="border: 0px none;"
cite="mid:CALehDX4RtKp99kN4odh08Rzyaw+QuToTNyaLqo5vHWSH5jLs1A@mail.gmail.com"
type="cite">
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<font color="#9FA2A5"><span style="padding-left:6px">Saturday,
September 21, 2013 11:26 AM</span></font></div></div></div>
<div style="color:#888888;margin-left:24px;margin-right:24px;"
__pbrmquotes="true" class="__pbConvBody"><p dir="ltr">Interesting. File
please? Thanks. </p>
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<a moz-do-not-send="true" href="mailto:rich@pennware.com"
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<font color="#9FA2A5"><span style="padding-left:6px">Saturday,
September 21, 2013 5:52 AM</span></font></div></div></div>
<div style="color:#888888;margin-left:24px;margin-right:24px;"
__pbrmquotes="true" class="__pbConvBody">Hi,
<br>
<br>I just updated from r190763 to r191137 and started getting failures
in
generated assembly language when debug info is enabled. Here is the test
case:
<br>
<br>// Compile and run for every target.
<br>// RUN: %ecc -g -o %t %s && %t
<br>// FAIL: %armecc -g -o %t %s && %armrun %t
<br>// FAIL: %armebecc -g -o %t %s && %armebrun %t
<br>// RUN: %i386ecc -g -o %t %s && %i386run %t
<br>// FAIL: %microblazeecc -g -o %t %s && %microblazerun %t
<br>// FAIL: %mipsecc -g -o %t %s && %mipsrun %t
<br>// FAIL: %mipselecc -g -o %t %s && %mipselrun %t
<br>// FAIL: %ppcecc -g -o %t %s && %ppcrun %t
<br>// FAIL: %ppc64ecc -g -o %t %s && %ppc64run %t
<br>// RUN: %x86_64ecc -g -o %t %s && %x86_64run %t
<br>
<br>int comm;
<br>int main()
<br>{
<br> comm = 6;
<br>}
<br>
<br>This fails on all but the x86 processors. The typical failure looks
like
this:
<br>...
<br> .type comm,@object # @comm
<br> .comm comm,4,4
<br> .cfi_sections .debug_frame
<br> .bss
<br>.L.bss_end:
<br>...
<br>.L.debug_abbrev_end:
<br> .section .debug_aranges,"",@progbits
<br> .long 36 # Length of ARange Set
<br> .short 2 # DWARF Arange version
number
<br> .long .L.debug_info_begin0 # Offset Into Debug Info
Section
<br> .byte 4 # Address Size (in bytes)
<br> .byte 0 # Segment Size (in bytes)
<br> .byte 255
<br> .byte 255
<br> .byte 255
<br> .byte 255
<br> .long comm
<br>.Lset0 = .L.bss_end-comm
<br> .long .Lset0
<br>
<br>The typical error message is:
<br>/tmp/debug-8ecf9d.s: Assembler messages:
<br>/tmp/debug-8ecf9d.s: Error: invalid operands (.bss and *COM*
sections)
for `-' when setting `.Lset0'
<br>
<br>Is it legal to mix .comm symbols and .bss symbols in assembly? Is
the
x86 success a bug or a feature?
<br>
<br>-Rich
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