[Bug symtab/26390] New: gdb.fortran/mixed-lang-stack.exp: error reading variable in backtrace

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

https://sourceware.org/bugzilla/show_bug.cgi?id=26390

            Bug ID: 26390
           Summary: gdb.fortran/mixed-lang-stack.exp: error reading
                    variable in backtrace
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: symtab
          Assignee: unassigned at sourceware dot org
          Reporter: vries at gcc dot gnu.org
  Target Milestone: ---

[ I'm using gcc-8 for this PR, the test-case seems to have been implemented
with gcc-8 and later abi in mind, see PR26362 comment 22.  FWIW, same behaviour
with gcc-11. ]

While looking into PR26362 I noticed this in the backtrace on a successful test
run on x86_64:
...
#7  0x000000000040114f in mixed_func_1b (a=1, b=2, c=3, d=(4,5), e=<error
reading variable: value requires 140737488341744 bytes, which is more than
max-value-size>, g=..., _e=6) at mixed-lang-stack.f90:87^M
...

Grepping for it, it reproduces with all 4 language setttings:
...
$ grep e= gdb.log | sed 's/.* e=/e=/;s/g=.*//'
e=<error reading variable: value requires 140737488341744 bytes, which is more
than max-value-size>, 
e=..., 
e=..., 
e=<error reading variable: value requires 140737488341744 bytes, which is more
than max-value-size>, 
e=..., 
e=..., 
e=<error reading variable: value requires 140737488341744 bytes, which is more
than max-value-size>, 
e=..., 
e=..., 
e=<error reading variable: value requires 140737488341744 bytes, which is more
than max-value-size>, 
e=..., 
e=..., 
...

The e='...' are due to printing of e when it's the current frame (resulting
from commands "up/down" or "info frame"), and with this:
...
diff --git a/gdb/testsuite/gdb.fortran/mixed-lang-stack.exp
b/gdb/testsuite/gdb.fortran/mix
ed-lang-stack.exp
index 793318626d..4047b548f9 100644
--- a/gdb/testsuite/gdb.fortran/mixed-lang-stack.exp
+++ b/gdb/testsuite/gdb.fortran/mixed-lang-stack.exp
@@ -50,6 +50,7 @@ proc run_tests { lang } {

        gdb_breakpoint "breakpt"
        gdb_continue_to_breakpoint "breakpt"
+       gdb_test_no_output "set print frame-arguments all"

        if { $lang == "c" || $lang == "c++" } {
            gdb_test "set language c" \
...
we have instead:
...
$ grep e= gdb.log | sed 's/.* e=/e=/;s/g=.*//'
e=<error reading variable: value requires 140737488341744 bytes, which is more
than max-value-size>, 
e='abcdef', 
e='abcdef', 
e=<error reading variable: value requires 140737488341744 bytes, which is more
than max-value-size>, 
e='abcdef', 
e='abcdef', 
e=<error reading variable: value requires 140737488341744 bytes, which is more
than max-value-size>, 
e="abcdef", 
e="abcdef", 
e=<error reading variable: value requires 140737488341744 bytes, which is more
than max-value-size>, 
e="abcdef", 
e="abcdef", 
...

So, this seems to be backtrace-specific.

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