[Bug rust/26197] rust FAILs with rustc 1.36.0 and llvm 7

["vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=26197

--- Comment #19 from Tom de Vries <vries at gcc dot gnu.org> ---
(In reply to Tom Tromey from comment #18)
> Then I checked out the version before a1520ad8fc (see comment #6).
> However, this one crashes trying to load the executable, which
> maybe is why that patch exists?  (I don't remember the context any more.)
> 

I've checked out a1520ad8fc^ and built it.

I'm observing the same as you, that is:
...
UNTESTED: gdb.rust/union.exp: could not run to breakpoint
UNTESTED: gdb.rust/modules.exp: could not run to breakpoint
UNTESTED: gdb.rust/simple.exp: could not run to breakpoint
UNTESTED: gdb.rust/traits.exp: could not read
/home/vries/gdb_versions/devel/build/gdb/testsuite/outputs/gdb.rust/traits/traits
with readelf
UNTESTED: gdb.rust/rust-style.exp: could not run to breakpoint
UNTESTED: gdb.rust/methods.exp: could not run to breakpoint
...

Which means that my assessment in comment 6 was wrong: this is not a regression
starting at that commit.

> Do you know of a version that passes these tests with this executable
> or rust compiler version?

I've tried the you mentioned, commit 9852ceef, and get:
...
Running target unix
Running /home/vries/gdb_versions/devel/src/gdb/testsuite/gdb.rust/union.exp ...
PASS: gdb.rust/union.exp: print u
PASS: gdb.rust/union.exp: ptype/o Union
PASS: gdb.rust/union.exp: print u2
Running /home/vries/gdb_versions/devel/src/gdb/testsuite/gdb.rust/modules.exp
...
PASS: gdb.rust/modules.exp: call f3()
PASS: gdb.rust/modules.exp: call self::f2()
PASS: gdb.rust/modules.exp: call self::super::f2()
PASS: gdb.rust/modules.exp: call super::f2()
PASS: gdb.rust/modules.exp: call self::super::super::f2()
PASS: gdb.rust/modules.exp: call super::super::f2()
PASS: gdb.rust/modules.exp: call ::f2()
PASS: gdb.rust/modules.exp: call extern modules::mod1::f2()
PASS: gdb.rust/modules.exp: call super::super::super::f2()
PASS: gdb.rust/modules.exp: ptype ::Generic::<::Generic<::Type> >
PASS: gdb.rust/modules.exp: ptype ::Generic::<::Generic<extern modules::Type> >
PASS: gdb.rust/modules.exp: ptype ::Generic::<::Generic<::mod1::Type>>
PASS: gdb.rust/modules.exp: ptype ::Generic::<::Generic<super::Type>>
PASS: gdb.rust/modules.exp: ptype ::Generic::<::Generic<self::Type>>
PASS: gdb.rust/modules.exp: setting breakpoint at
modules::mod1::inner::innest::f2
PASS: gdb.rust/modules.exp: setting breakpoint at *::mod1::inner::innest::f2
PASS: gdb.rust/modules.exp: setting breakpoint at modules::mod1::inner::f2
PASS: gdb.rust/modules.exp: setting breakpoint at *::mod1::inner::f2
PASS: gdb.rust/modules.exp: setting breakpoint at modules::mod1::f2
PASS: gdb.rust/modules.exp: setting breakpoint at *::mod1::f2
PASS: gdb.rust/modules.exp: setting breakpoint at modules::f2
PASS: gdb.rust/modules.exp: setting breakpoint at *::f2
PASS: gdb.rust/modules.exp: print ::TWENTY_THREE
Running /home/vries/gdb_versions/devel/src/gdb/testsuite/gdb.rust/unsized.exp
...
PASS: gdb.rust/unsized.exp: ptype *us
Running /home/vries/gdb_versions/devel/src/gdb/testsuite/gdb.rust/simple.exp
...
PASS: gdb.rust/simple.exp: print a
PASS: gdb.rust/simple.exp: ptype a
PASS: gdb.rust/simple.exp: print sizeof(a)
PASS: gdb.rust/simple.exp: print b
PASS: gdb.rust/simple.exp: ptype b
PASS: gdb.rust/simple.exp: print *(&b as *const [i32; 0])
PASS: gdb.rust/simple.exp: print *(&b as *const [i32; 0_0])
PASS: gdb.rust/simple.exp: print c
PASS: gdb.rust/simple.exp: ptype c
PASS: gdb.rust/simple.exp: print sizeof(c)
PASS: gdb.rust/simple.exp: print c = 87
PASS: gdb.rust/simple.exp: print c
PASS: gdb.rust/simple.exp: print c += 3
PASS: gdb.rust/simple.exp: print c
PASS: gdb.rust/simple.exp: print c -= 90
PASS: gdb.rust/simple.exp: print c
PASS: gdb.rust/simple.exp: print *&c
PASS: gdb.rust/simple.exp: print *(&c as &i32)
PASS: gdb.rust/simple.exp: print *(&c as *const i32)
PASS: gdb.rust/simple.exp: print *(&c as *mut i32)
PASS: gdb.rust/simple.exp: ptype &c as *mut i32
PASS: gdb.rust/simple.exp: print/c f[0]
PASS: gdb.rust/simple.exp: print j
PASS: gdb.rust/simple.exp: ptype j
PASS: gdb.rust/simple.exp: print j2
PASS: gdb.rust/simple.exp: ptype j2
PASS: gdb.rust/simple.exp: print simple::Unit
PASS: gdb.rust/simple.exp: print simple::Unit{}
PASS: gdb.rust/simple.exp: print f
PASS: gdb.rust/simple.exp: print fslice
PASS: gdb.rust/simple.exp: print &f[3..]
PASS: gdb.rust/simple.exp: print g
PASS: gdb.rust/simple.exp: ptype g
PASS: gdb.rust/simple.exp: print v
PASS: gdb.rust/simple.exp: ptype v
PASS: gdb.rust/simple.exp: print w
PASS: gdb.rust/simple.exp: ptype w
PASS: gdb.rust/simple.exp: print w[2]
PASS: gdb.rust/simple.exp: print w[2] @ 2
PASS: gdb.rust/simple.exp: print w_ptr[2]
PASS: gdb.rust/simple.exp: print fromslice
PASS: gdb.rust/simple.exp: print slice[0]
PASS: gdb.rust/simple.exp: print slice as &[i32][0]
PASS: gdb.rust/simple.exp: ptype slice
PASS: gdb.rust/simple.exp: ptype &slice[..]
PASS: gdb.rust/simple.exp: ptype &b[..]
PASS: gdb.rust/simple.exp: print x
PASS: gdb.rust/simple.exp: ptype x
PASS: gdb.rust/simple.exp: print x as (i32,f64)
PASS: gdb.rust/simple.exp: print y
PASS: gdb.rust/simple.exp: ptype y
PASS: gdb.rust/simple.exp: print y.field2
PASS: gdb.rust/simple.exp: print z
PASS: gdb.rust/simple.exp: ptype z
PASS: gdb.rust/simple.exp: print z.1
PASS: gdb.rust/simple.exp: print univariant
PASS: gdb.rust/simple.exp: print univariant.a
PASS: gdb.rust/simple.exp: print univariant_anon
PASS: gdb.rust/simple.exp: print univariant_anon.0
PASS: gdb.rust/simple.exp: print univariant_anon.sss
PASS: gdb.rust/simple.exp: ptype simple::Univariant
PASS: gdb.rust/simple.exp: ptype simple::UnivariantAnon
PASS: gdb.rust/simple.exp: ptype simple::ByeBob
PASS: gdb.rust/simple.exp: print simple::ByeBob(0xff, 5)
PASS: gdb.rust/simple.exp: print simple::ByeBob{field1: 0xff, field2:5}
PASS: gdb.rust/simple.exp: print simple::HiBob(0xff, 5)
PASS: gdb.rust/simple.exp: print sizeof(simple::HiBob)
PASS: gdb.rust/simple.exp: print simple::HiBob + 5
PASS: gdb.rust/simple.exp: print nosuchsymbol
PASS: gdb.rust/simple.exp: print simple::HiBob{field1, field2}
PASS: gdb.rust/simple.exp: print simple::HiBob{field1: 99, .. y}
PASS: gdb.rust/simple.exp: print e
PASS: gdb.rust/simple.exp: print e2
PASS: gdb.rust/simple.exp: print sizeof(e)
PASS: gdb.rust/simple.exp: ptype e
PASS: gdb.rust/simple.exp: print e.0
PASS: gdb.rust/simple.exp: print e.1
PASS: gdb.rust/simple.exp: print e.foo
PASS: gdb.rust/simple.exp: print e2.variant
PASS: gdb.rust/simple.exp: print e2.notexist
PASS: gdb.rust/simple.exp: print e2.0
XFAIL: gdb.rust/simple.exp: print k
PASS: gdb.rust/simple.exp: print l
PASS: gdb.rust/simple.exp: print *l.1
PASS: gdb.rust/simple.exp: print diff2(3, 7)
PASS: gdb.rust/simple.exp: print self::diff2(8, 9)
PASS: gdb.rust/simple.exp: print ::diff2(23, -23)
PASS: gdb.rust/simple.exp: ptype diff2
PASS: gdb.rust/simple.exp: ptype empty
PASS: gdb.rust/simple.exp: print (diff2 as fn(i32, i32) -> i32)(19, -2)
PASS: gdb.rust/simple.exp: print "hello rust"
PASS: gdb.rust/simple.exp: print "hello
PASS: gdb.rust/simple.exp: print r##"hello " rust"##
PASS: gdb.rust/simple.exp: print r"hello
PASS: gdb.rust/simple.exp: print r###"###hello"
PASS: gdb.rust/simple.exp: print r###"###hello"##
PASS: gdb.rust/simple.exp: print r###"hello###
PASS: gdb.rust/simple.exp: print 0..5
PASS: gdb.rust/simple.exp: print 0..=5
PASS: gdb.rust/simple.exp: print ..5
PASS: gdb.rust/simple.exp: print ..=5
PASS: gdb.rust/simple.exp: print 5..
PASS: gdb.rust/simple.exp: print ..
XFAIL: gdb.rust/simple.exp: print str_some
XFAIL: gdb.rust/simple.exp: print str_none
PASS: gdb.rust/simple.exp: print int_some
PASS: gdb.rust/simple.exp: print int_none
PASS: gdb.rust/simple.exp: print box_some
PASS: gdb.rust/simple.exp: print box_none
XFAIL: gdb.rust/simple.exp: print custom_some
XFAIL: gdb.rust/simple.exp: print custom_none
PASS: gdb.rust/simple.exp: print st
PASS: gdb.rust/simple.exp: print slice
PASS: gdb.rust/simple.exp: print &w[2..3]
PASS: gdb.rust/simple.exp: print slice
PASS: gdb.rust/simple.exp: print &w[2..=2]
PASS: gdb.rust/simple.exp: print slice2
PASS: gdb.rust/simple.exp: print &slice[0..1]
PASS: gdb.rust/simple.exp: print slice2
PASS: gdb.rust/simple.exp: print &slice[0..=0]
PASS: gdb.rust/simple.exp: print all1
PASS: gdb.rust/simple.exp: print &w[..]
PASS: gdb.rust/simple.exp: print all2
PASS: gdb.rust/simple.exp: print &slice[..]
PASS: gdb.rust/simple.exp: print from1
PASS: gdb.rust/simple.exp: print &w[1..]
PASS: gdb.rust/simple.exp: print from2
PASS: gdb.rust/simple.exp: print &slice[1..]
PASS: gdb.rust/simple.exp: print to1
PASS: gdb.rust/simple.exp: print &w[..3]
PASS: gdb.rust/simple.exp: print to1
PASS: gdb.rust/simple.exp: print &w[..=2]
PASS: gdb.rust/simple.exp: print to2
PASS: gdb.rust/simple.exp: print &slice[..1]
PASS: gdb.rust/simple.exp: print to2
PASS: gdb.rust/simple.exp: print &slice[..=0]
PASS: gdb.rust/simple.exp: print w[2..3]
PASS: gdb.rust/simple.exp: complete print y.f
PASS: gdb.rust/simple.exp: complete print y.
PASS: gdb.rust/simple.exp: print (1,2,3)
PASS: gdb.rust/simple.exp: print (1,)
PASS: gdb.rust/simple.exp: print (1)
PASS: gdb.rust/simple.exp: print 23..97.0
PASS: gdb.rust/simple.exp: print (*parametrized.next.val)
PASS: gdb.rust/simple.exp: print parametrized.next.val
PASS: gdb.rust/simple.exp: print parametrized
PASS: gdb.rust/simple.exp: ptype/o SimpleLayout
PASS: gdb.rust/simple.exp: print nonzero_offset
PASS: gdb.rust/simple.exp: print empty_enum_value
PASS: gdb.rust/simple.exp: ptype empty_enum_value
PASS: gdb.rust/simple.exp: print empty_enum_value.0
PASS: gdb.rust/simple.exp: print empty_enum_value.something
PASS: gdb.rust/simple.exp: python print(gdb.lookup_type('simple::HiBob'))
Running /home/vries/gdb_versions/devel/src/gdb/testsuite/gdb.rust/watch.exp ...
PASS: gdb.rust/watch.exp: watch -location y
Running /home/vries/gdb_versions/devel/src/gdb/testsuite/gdb.rust/traits.exp
...
UNTESTED: gdb.rust/traits.exp: could not read
/home/vries/gdb_versions/devel/build/gdb/testsui
te/outputs/gdb.rust/traits/traits with readelf
Running /home/vries/gdb_versions/devel/src/gdb/testsuite/gdb.rust/expr.exp ...
PASS: gdb.rust/expr.exp: set var $something = 27
PASS: gdb.rust/expr.exp: set language rust
PASS: gdb.rust/expr.exp: set language to "rust"
PASS: gdb.rust/expr.exp: print 9__97
PASS: gdb.rust/expr.exp: print -5
PASS: gdb.rust/expr.exp: print +5
PASS: gdb.rust/expr.exp: print +-+-5
PASS: gdb.rust/expr.exp: print 3_2i32
PASS: gdb.rust/expr.exp: print 32i64
PASS: gdb.rust/expr.exp: print 8u8
PASS: gdb.rust/expr.exp: print 0x1f
PASS: gdb.rust/expr.exp: print 0o07
PASS: gdb.rust/expr.exp: print 0o70
PASS: gdb.rust/expr.exp: print 0b1_111
PASS: gdb.rust/expr.exp: print 32usize
PASS: gdb.rust/expr.exp: print 0x_4
PASS: gdb.rust/expr.exp: print 'z'
PASS: gdb.rust/expr.exp: print '\t'
PASS: gdb.rust/expr.exp: print '\n'
PASS: gdb.rust/expr.exp: print '\r'
PASS: gdb.rust/expr.exp: print '\\'
PASS: gdb.rust/expr.exp: print '\0'
PASS: gdb.rust/expr.exp: print '\''
PASS: gdb.rust/expr.exp: print '\"'
PASS: gdb.rust/expr.exp: print '\xff'
PASS: gdb.rust/expr.exp: print '\xFF'
PASS: gdb.rust/expr.exp: print '\u{F0eF}'
PASS: gdb.rust/expr.exp: print b'z'
PASS: gdb.rust/expr.exp: print b'\xfe'
PASS: gdb.rust/expr.exp: print b'\t'
PASS: gdb.rust/expr.exp: print b'\n'
PASS: gdb.rust/expr.exp: print b'\r'
PASS: gdb.rust/expr.exp: print b'\\'
PASS: gdb.rust/expr.exp: print b'\0'
PASS: gdb.rust/expr.exp: print b'\''
PASS: gdb.rust/expr.exp: print b'\"'
PASS: gdb.rust/expr.exp: print b'\xff'
PASS: gdb.rust/expr.exp: print 23.5
PASS: gdb.rust/expr.exp: print 23.5e1
PASS: gdb.rust/expr.exp: print 2e4
PASS: gdb.rust/expr.exp: print 2_E+4_f64
PASS: gdb.rust/expr.exp: print 5e-1
PASS: gdb.rust/expr.exp: print 5e-1f32
PASS: gdb.rust/expr.exp: print false
PASS: gdb.rust/expr.exp: print true
PASS: gdb.rust/expr.exp: print 1+2
PASS: gdb.rust/expr.exp: print 1i32 + 2i32
PASS: gdb.rust/expr.exp: print 2.0 - 1.0
PASS: gdb.rust/expr.exp: print !false
PASS: gdb.rust/expr.exp: print !true
PASS: gdb.rust/expr.exp: print !0u8
PASS: gdb.rust/expr.exp: print 7 * 7
PASS: gdb.rust/expr.exp: print 7usize * 7usize
PASS: gdb.rust/expr.exp: print 42 / 7
PASS: gdb.rust/expr.exp: print 42 % 7
PASS: gdb.rust/expr.exp: print 1.0 / 2.0
PASS: gdb.rust/expr.exp: print 1 < 2
PASS: gdb.rust/expr.exp: print !(1 < 2)
PASS: gdb.rust/expr.exp: print 3 + 4 * 7
PASS: gdb.rust/expr.exp: print 1 > 2
PASS: gdb.rust/expr.exp: print 1 | 2
PASS: gdb.rust/expr.exp: print 1 & 2
PASS: gdb.rust/expr.exp: print 3 & 2
PASS: gdb.rust/expr.exp: print 3 ^ 2
PASS: gdb.rust/expr.exp: print (1 < 0) || true
PASS: gdb.rust/expr.exp: print (1 > 0) && false
PASS: gdb.rust/expr.exp: print 'z' == 'z'
PASS: gdb.rust/expr.exp: print '\u{1016f}' != 'q'
PASS: gdb.rust/expr.exp: print 32 <= 32
PASS: gdb.rust/expr.exp: print 32 >= 32
PASS: gdb.rust/expr.exp: print 1 << 5
PASS: gdb.rust/expr.exp: print 32usize >> 5
PASS: gdb.rust/expr.exp: ptype 32i32 as f64
PASS: gdb.rust/expr.exp: ptype 0xf9f9f9f90000
PASS: gdb.rust/expr.exp: print ()
PASS: gdb.rust/expr.exp: print [1,2,3,4]
PASS: gdb.rust/expr.exp: ptype [1,2,3,4]
PASS: gdb.rust/expr.exp: print [mut 1,2,3,4]
PASS: gdb.rust/expr.exp: print b"hi rust"
PASS: gdb.rust/expr.exp: print b"\xddhi bob"
PASS: gdb.rust/expr.exp: print b"has\0nul"
PASS: gdb.rust/expr.exp: print br##"hi"##
PASS: gdb.rust/expr.exp: print br##"hi
PASS: gdb.rust/expr.exp: print br##"hi"
PASS: gdb.rust/expr.exp: print br##"hi"#
PASS: gdb.rust/expr.exp: print $something
PASS: gdb.rust/expr.exp: print $_isvoid($nosuchvariable)
PASS: gdb.rust/expr.exp: print $_isvoid($something)
PASS: gdb.rust/expr.exp: print [23usize; 4]
PASS: gdb.rust/expr.exp: ptype [23usize; 4]
PASS: gdb.rust/expr.exp: print [mut 23usize; 4]
PASS: gdb.rust/expr.exp: print 0x0 as *mut ()
PASS: gdb.rust/expr.exp: print 0x0 as fn(i64) -> ()
PASS: gdb.rust/expr.exp: print r#
PASS: gdb.rust/expr.exp: printf "%d %d\n", 23+1, 23-1
Running
/home/vries/gdb_versions/devel/src/gdb/testsuite/gdb.rust/rust-style.exp ...
PASS: gdb.rust/rust-style.exp: print v
Running /home/vries/gdb_versions/devel/src/gdb/testsuite/gdb.rust/methods.exp
...
PASS: gdb.rust/methods.exp: print x
PASS: gdb.rust/methods.exp: print methods::HasMethods{value: 73}
PASS: gdb.rust/methods.exp: print methods::HasMethods{..x}
PASS: gdb.rust/methods.exp: print methods::HasMethods{value:19, ..x}
PASS: gdb.rust/methods.exp: print x.take()
PASS: gdb.rust/methods.exp: print *(x.incr())
PASS: gdb.rust/methods.exp: print *((&mut x).incr())
PASS: gdb.rust/methods.exp: print a.value()
PASS: gdb.rust/methods.exp: print (&mut a).value()
PASS: gdb.rust/methods.exp: print b.value()
PASS: gdb.rust/methods.exp: print c.value()
PASS: gdb.rust/methods.exp: continue to breakpoint: second breakpoint
PASS: gdb.rust/methods.exp: print *self
PASS: gdb.rust/methods.exp: info functions HasMethods::new
Running /home/vries/gdb_versions/devel/src/gdb/testsuite/gdb.rust/generics.exp
...
FAIL: gdb.rust/generics.exp: print identity::<u32>(23u32)
FAIL: gdb.rust/generics.exp: ptype identity::<u32>(23u32)
FAIL: gdb.rust/generics.exp: print identity::<f64>(23)
FAIL: gdb.rust/generics.exp: ptype identity::<f64>(23)
PASS: gdb.rust/generics.exp: print e
PASS: gdb.rust/generics.exp: print generics::Hold::<i32> (7)
PASS: gdb.rust/generics.exp: print Hold::<i32> (7)
FAIL: gdb.rust/generics.exp: print identity::< Hold<i32> >(e)
FAIL: gdb.rust/generics.exp: print identity::<generics::Hold<i32> >(e)
FAIL: gdb.rust/generics.exp: print identity::<Hold<i32>>(e)

                === gdb Summary ===

# of expected passes            289
# of unexpected failures        7
# of expected failures          5
# of untested testcases         1
...

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