[llvm-bugs] [Bug 42082] New: Sets execute permissions but GNU objcopy does not

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=42082

            Bug ID: 42082
           Summary: Sets execute permissions but GNU objcopy does not
           Product: tools
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: llvm-objcopy/strip
          Assignee: unassignedbugs at nondot.org
          Reporter: alexbrachetmialot at gmail.com
                CC: alexander.v.shaposhnikov at gmail.com,
                    jake.h.ehrlich at gmail.com,
                    jh7370.2008 at my.bristol.ac.uk,
                    llvm-bugs at lists.llvm.org, rupprecht at google.com

llvm-objcopy writes files with all 3 execute bits set. This is not what GNU
objcopy does. Is this intended? This happens on line 39 of Buffer.cpp where we
create the FileOutputBuffer, if we just remove the F_executable flag we will
have the same behaviour as GNU objcopy. 

$ llvm-objcopy --strip-symbol=func test.o no_func_llvm.o
$ objcopy --strip-symbol=func test.o no_func_gnu.o
$ ls -l
-rw-rw-r-- 1 abrachet abrachet 1648 May 30 22:38 no_func_gnu.o
-rwxrwxr-x 1 abrachet abrachet 1648 May 30 22:38 no_func_llvm.o

For reference:
$ objcopy --version
GNU objcopy (GNU Binutils for Ubuntu) 2.30

$ llvm-objcopy --version
llvm-objcopy, compatible with GNU objcopy
LLVM (http://llvm.org/):
  LLVM version 9.0.0svn
  DEBUG build with assertions.
  Default target: x86_64-unknown-linux-gnu
  Host CPU: skylake

$ file test.o
test.o: ELF 64-bit LSB relocatable, x86-64, version 1 (SYSV), not stripped

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