[llvm-bugs] [Bug 42034] New: Incorrect expansion of '@' in inline asm macros

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https://bugs.llvm.org/show_bug.cgi?id=42034

            Bug ID: 42034
           Summary: Incorrect expansion of '@' in inline asm macros
           Product: clang
           Version: 8.0
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C
          Assignee: unassignedclangbugs at nondot.org
          Reporter: royger at freebsd.org
                CC: blitzrakete at gmail.com, dgregor at apple.com,
                    erik.pilkington at gmail.com, llvm-bugs at lists.llvm.org,
                    richard-llvm at metafoo.co.uk

Hello,

clang doesn't seem to properly expand '@' when used in asm macros which are
then called in inline assembly. Given the following example:

# cc -v
FreeBSD clang version 8.0.0 (tags/RELEASE_800/final 356365) (based on LLVM
8.0.0)
Target: x86_64-unknown-freebsd13.0
Thread model: posix
InstalledDir: /usr/bin
# cat test.c
asm (".macro FOO\n.L@:\n.endm");
asm ("FOO");
asm ("FOO");
# cc -o test test.c
<instantiation>:1:1: error: invalid symbol redefinition
.L@:
^
1 error generated.

AFAICT it seems like clang doesn't carry proper count of how many times an asm
macro has been instantiated in inline assembly.

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