[Bug general/28975] New: run-large-elf-file.sh fails in 32-bit cross-compile on 64-bit machine

[Bug general/28975] New: run-large-elf-file.sh fails in 32-bit cross-compile on 64-bit machine

[eric.boehm at broadcom dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=28975

            Bug ID: 28975
           Summary: run-large-elf-file.sh fails in 32-bit cross-compile on
                    64-bit machine
           Product: elfutils
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: general
          Assignee: unassigned at sourceware dot org
          Reporter: eric.boehm at broadcom dot com
                CC: elfutils-devel at sourceware dot org
  Target Milestone: ---

run-large-elf-file.sh should not run if it is a 32-bit cross-compile on a
64-bit machine.

The shell script checks

long_bit=$(getconf LONG_BIT)

which will return 64 even if it is a 32-bit compile

Here's a patch which is a bit of a hack. There are probably more appropriate
ways to fix this.

This affects versions 0.181-0.186

--- elfutils-0.181/tests/run-large-elf-file.sh.orig     2020-09-08
04:45:06.000000000 -0700
+++ elfutils-0.181/tests/run-large-elf-file.sh  2022-03-17 12:23:53.967607000
-0700
@@ -21,3 +21,8 @@
 # ELF files.
-long_bit=$(getconf LONG_BIT)
+if [[ $CC =~ "-m32" ]]
+then
+    long_bit=32
+else
+    long_bit=$(getconf LONG_BIT)
+fi
 echo "long_bit: $long_bit"

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[Bug general/28975] run-large-elf-file.sh fails in 32-bit cross-compile on 64-bit machine

[mark at klomp dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=28975

Mark Wielaard <mark at klomp dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |mark at klomp dot org
           Assignee|unassigned at sourceware dot org   |mark at klomp dot org
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2022-03-20
             Status|UNCONFIRMED                 |ASSIGNED

--- Comment #1 from Mark Wielaard <mark at klomp dot org> ---
You are right, we should (also) test that the test binary itself is 64bits.
I would propose adding something like this:

# The test binary also needs to be 64bits itself
elfclass=64
testrun ${abs_top_builddir}/src/readelf -h ${abs_builddir}/addsections | grep
ELF32 \
       && elfclass=32
echo elfclass: $elfclass
if test $elfclass -ne 64; then
  echo "Only 64bit binaries can create > 4GB ELF files"
  exit 77
fi

Full patch:
https://sourceware.org/pipermail/elfutils-devel/2022q1/004752.html

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[Bug general/28975] run-large-elf-file.sh fails in 32-bit cross-compile on 64-bit machine

[mark at klomp dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=28975

Mark Wielaard <mark at klomp dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|---                         |FIXED

--- Comment #2 from Mark Wielaard <mark at klomp dot org> ---
commit d85945f1056641180e03fb48ab770b893125786e
Author: Mark Wielaard <mark@klomp.org>
Date:   Mon Mar 21 00:34:24 2022 +0100

    configure: Don't check whether -m64 works for 32bit host biarch check

    Running a 32bit backtrace test against a 64bit binary doesn't work.
    Only a 64bit binary can backtrace a 32bit binary. So disable the
    biarch check that inserts -m64 for a 32bit host.

    https://sourceware.org/bugzilla/show_bug.cgi?id=24158

    Signed-off-by: Mark Wielaard <mark@klomp.org>

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