[Octave-bug-tracker] [bug #64590] Wrong behavior of mkoctfile when option -fdebug-prefix-map is present

[Rafael Laboissière]

URL:
  <https://savannah.gnu.org/bugs/?64590>

                 Summary: Wrong behavior of mkoctfile when option
-fdebug-prefix-map is present
                   Group: GNU Octave
               Submitter: rlaboiss
               Submitted: Thu 24 Aug 2023 01:36:55 PM UTC
                Category: Other
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Unexpected Error or Warning
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
                 Release: 8.3.0
         Discussion Lock: Any
        Operating System: GNU/Linux
           Fixed Release: None
         Planned Release: None


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Follow-up Comments:


-------------------------------------------------------
Date: Thu 24 Aug 2023 01:36:55 PM UTC By: Rafael Laboissière <rlaboiss>
I came across an issue with mkoctfile, which can be exercised with the
Makefile attached to this message. When copying it to an empty directory and
running "make", it produces the output below.


touch b.cc
touch a.cc
mkoctfile --verbose -c a.cc
g++ -c -Wdate-time -D_FORTIFY_SOURCE=2 -fPIC
-I/usr/include/octave-8.3.0/octave/.. -I/usr/include/octave-8.3.0/octave 
-pthread -fopenmp -g -O2
-ffile-prefix-map=/build/reproducible-path/octave-8.3.0=. -flto=aut
o -ffat-lto-objects -fstack-protector-strong -Wformat -Werror=format-security 
  a.cc -o a.o
===== FINE
mkoctfile --verbose b.cc a.o
g++ -c -Wdate-time -D_FORTIFY_SOURCE=2 -fPIC
-I/usr/include/octave-8.3.0/octave/.. -I/usr/include/octave-8.3.0/octave 
-pthread -fopenmp -g -O2
-ffile-prefix-map=/build/reproducible-path/octave-8.3.0=. -flto=aut
o -ffat-lto-objects -fstack-protector-strong -Wformat -Werror=format-security 
  b.cc -o /var/tmp/oct-8sYg58.o
g++ -I/usr/include/octave-8.3.0/octave/.. -I/usr/include/octave-8.3.0/octave 
-pthread -fopenmp -g -O2
-ffile-prefix-map=/build/reproducible-path/octave-8.3.0=. -flto=auto
-ffat-lto-objects -fstack-protector-str
ong -Wformat -Werror=format-security  -o b.oct  a.o /var/tmp/oct-8sYg58.o  
-shared -Wl,-Bsymbolic  -L/usr/lib/x86_64-linux-gnu -shared -Wl,-Bsymbolic 
-L/usr/lib/x86_64-linux-gnu -shared -Wl,-Bsymbolic  -flto=a
uto -ffat-lto-objects -Wl,-z,relro 
===== FAIL
mkoctfile --verbose -fdebug-prefix-map=.=. b.cc a.o
g++ -I/usr/include/octave-8.3.0/octave/.. -I/usr/include/octave-8.3.0/octave 
-pthread -fopenmp -g -O2
-ffile-prefix-map=/build/reproducible-path/octave-8.3.0=. -flto=auto
-ffat-lto-objects -fstack-protector-str
ong -Wformat -Werror=format-security  -fdebug-prefix-map=.=. b.cc -o a.oct 
a.o   -shared -Wl,-Bsymbolic  -L/usr/lib/x86_64-linux-gnu -shared
-Wl,-Bsymbolic  -L/usr/lib/x86_64-linux-gnu -shared -Wl,-Bsymbolic  -
flto=auto -ffat-lto-objects -Wl,-z,relro 
rm a.cc


This Makefile has two targets "fine" and "fail", whose difference is only the
presence (or absence) of option -fdebug-prefix-map when invoking mkoctfile. In
both cases, the output file produced by mkoctfile should be b.oct. This is
indeed the case for the "fine" target. However, for the "fail" target, file
a.oct is built.






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File Attachments:


-------------------------------------------------------
Date: Thu 24 Aug 2023 01:36:55 PM UTC  Name: Makefile  Size: 293B   By:
rlaboiss

<http://savannah.gnu.org/bugs/download.php?file_id=55072>

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