[llvm-bugs] [Bug 42831] New: clang drops the -flto=full when compiling an assembler file

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=42831

            Bug ID: 42831
           Summary: clang drops the -flto=full when compiling an assembler
                    file
           Product: clang
           Version: 8.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: belangerj at ainfosec.com
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org,
                    neeilans at live.com, richard-llvm at metafoo.co.uk

When I type the following (note: for a .c file and -flto=full specified):
----------------------------
$ clang -flto-full -W<others> -f<others> -c test.c -o test.c.o -v
clang version 8.0.8
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/users/me/llvm/bin
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/5
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/5.5.0
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/6
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/6.0.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.5.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6.0.0
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.4.0
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Candidate multilib: x32;@m32
Selected multilib: .;@m64
"/home/users/me/llvm/bin/clang-8" \
    -cc1 \
    -triple x86_64-unknown-linux-gnu \
    -emit-llvm-bc \
    -flto=full \                                   # <<<<< Note: -flto=full
    -flto-unit \
    -disable-free \
    -disable-llvm-verifier \
    -discard-value-names \
    -main-file-name test.c \
    -mrelocation-model pic \
    -pic-level 2 \
    -mthread-model posix \
    -fmerge-all-constants \
    -fmath-errno \
    -masm-verbose \
    -mconstructor-aliases \
    -munwind-tables \
    -fuse-init-array \
    -target-cpu x86-64 \
    -dwarf-column-info \
    -debugger-tuning=gdb \
    -momit-leaf-frame-pointer \
    -v \
    -coverage-notes-file test.c.gcno \
    -nostdsysteminc \
    -nobuiltininc \
    -resource-dir /home/users/me/llvm/lib/clang/8.0.0 \
    <all-my-includes> \
    <all-my-supplied-options> \
    -o test.c.o \
    -x c \
    test.c \
    -faddrsig
clang -cc1 version 8.0.0 based upon LLVM 8.0.0 default target
x86_64-unknown-linux-gnu
#include "..." search starts here:
#include <...> search starts here:
  <list-of-my-include-files>
End of search list.
----------------------------

When I type the following (note for a .S file):
----------------------------
$ clang -flto-full -W<others> -f<others> -c test.S -o test.S.o -v
clang version 8.0.8
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/users/me/llvm/bin
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/5
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/5.5.0
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/6
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/6.0.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.5.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6.0.0
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.4.0
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Candidate multilib: x32;@m32
Selected multilib: .;@m64
"/home/users/me/llvm/bin/clang-8" \
    -cc1 \
    -triple x86_64-unknown-linux-gnu \
    -E \                                           # <<<<< Note: E
                                                   # <<<<< Note: no
-emit-llvm-bc
                                                   # <<<<< Note: no -flto=full
                                                   # <<<<< Note: no -flto-unit
    -disable-free \
    -disable-llvm-verifier \
    -discard-value-names \
    -main-file-name test.S \
    -mrelocation-model pic \
    -pic-level 2 \
    -mthread-model posix \
    -fmerge-all-constants \
    -fmath-errno \
    -masm-verbose \
    -mconstructor-aliases \
    -munwind-tables \
    -fuse-init-array \
    -target-cpu x86-64 \
    -dwarf-column-info \
    -debugger-tuning=gdb \
    -momit-leaf-frame-pointer \
    -v \
    -coverage-notes-file test.S.gcno \
    -nostdsysteminc \
    -nobuiltininc \
    -resource-dir /home/users/me/llvm/lib/clang/8.0.0 \
    <all-my-includes> \
    <all-my-supplied-options> \
    -o test.S.o \
    -x c \
    test.S \
    -faddrsig
clang -cc1 version 8.0.0 based upon LLVM 8.0.0 default target
x86_64-unknown-linux-gnu
#include "..." search starts here:
#include <...> search starts here:
  <list-of-my-include-files>
End of search list.
----------------------------

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