https://bugs.llvm.org/show_bug.cgi?id=48894
Bug ID: 48894
Summary: clang's integrated assembler doesn't permit setting
the target arch via -Wa,-march=armv7-a
Product: clang
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: -New Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: ndesaulni...@google.com
CC: caij2...@gmail.com, htmldevelo...@gmail.com,
kristof.be...@arm.com, lloz...@chromium.org,
llvm-bugs@lists.llvm.org, natechancel...@gmail.com,
neeil...@live.com, richard-l...@metafoo.co.uk,
srhi...@google.com
Blocks: 4068
Consider the following file:
$ cat foo.s
foo:
dmb
$ clang --target=arm-linux-gnueabi -Wa,-march=armv7-a foo.s -c
clang-12: warning: argument unused during compilation: '-Wa,-march=armv7-a'
[-Wunused-command-line-argument]
foo.s:2:3: error: instruction requires: data-barriers
dmb
^
$ cat bar.s
.arch armv7-a
foo:
dmb
$ clang --target=arm-linux-gnueabi -Wa,-march=armv7-a bar.s -c
clang-12: warning: argument unused during compilation: '-Wa,-march=armv7-a'
[-Wunused-command-line-argument]
It would seem that clang will only set the target arch via assembler directive
and not consuming the command line flag.
This is a blocker to using Clang's integrated assembler for the 32b ARM Linux
kernel.
Referenced Bugs:
https://bugs.llvm.org/show_bug.cgi?id=4068
[Bug 4068] [Meta] Compiling the Linux kernel with clang
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