[Bug uprobes/21241] build systemtap module fail for uprobe for target aarch64-android

["ray.zheng at oceanwing dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=21241

--- Comment #2 from ray <ray.zheng at oceanwing dot com> ---
Hi,expert

I use systemtap module in android target,so I need to compile it to module.

I use gdb to trace, found that it enter the dwarf_builder::build,
and after it return to derive_probes, found the condition in line 1041&1042 is
right,so it throw the no match error. 

1039           unsigned num_atend = dps.size();
1040 
1041           if (! (loc->optional||parent_optional) && // something required,
but
1042               num_atbegin == num_atend) // nothing new derived!
1043             throw SEMANTIC_ERROR (_("no match"));

but it do not know what happen in the dwarf_builder::build.

what can I do next to check the reason of this problem?

back trace show below:

#0  dwarf_builder::build (this=0x30628e0, sess=..., base=0x2fa1060,
location=0xf64ba0, parameters=std::map with 2 elements = {...},
finished_results=std::vector of length 0, capacity 0) at tapsets.cxx:802
4
#1  0x000000000047fc74 in match_node::find_and_build (this=0x3067a50, s=...,
p=p@entry=0x2fa1060, loc=loc@entry=0xf64ba0, pos=pos@entry=2,
results=std::vector of length 0, capacity 0, builders=std::set wi
th 0 elements) at elaborate.cxx:474
#2  0x00000000004807c5 in match_node::find_and_build (this=0x2f798d0, s=...,
p=p@entry=0x2fa1060, loc=loc@entry=0xf64ba0, pos=pos@entry=1,
results=std::vector of length 0, capacity 0, builders=std::set wi
th 0 elements) at elaborate.cxx:648
#3  0x00000000004807c5 in match_node::find_and_build (this=0x8a3240, s=...,
p=p@entry=0x2fa1060, loc=loc@entry=0xf64ba0, pos=pos@entry=0,
results=std::vector of length 0, capacity 0, builders=std::set wit
h 0 elements) at elaborate.cxx:648
#4  0x000000000048170d in derive_probes (s=..., p=0x2fa1060, dps=std::vector of
length 0, capacity 0, optional=optional@entry=false,
rethrow_errors=rethrow_errors@entry=false) at elaborate.cxx:1022
#5  0x00000000004836a7 in semantic_pass_symbols (s=...) at elaborate.cxx:1883
#6  0x00000000004959ba in semantic_pass (s=...) at elaborate.cxx:2420
#7  0x0000000000412cd5 in passes_0_4 (s=...) at main.cxx:898
#8  0x000000000040b4e5 in main (argc=<optimized out>, argv=<optimized out>) at
main.cxx:1333

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