[llvm-bugs] [Bug 33909] New: error: unexpected token at start of statement on GCC asm statements

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=33909

            Bug ID: 33909
           Summary: error: unexpected token at start of statement on GCC
                    asm statements
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: hjl.tools at gmail.com
                CC: llvm-bugs at lists.llvm.org

GCC asm statements are used to get target properties with a cross compiler
without compiling and running a program:

[hjl at gnu-skl-1 asm-1]$ cat x.c
struct foo
{
  int x;
};

void
foo (void)
{
  __asm__ ("@@@name@@@SIZEO_OF_FOO@@@value@@@%0@@@end@@@" :: "i" (sizeof
(struct foo)));
}
[hjl at gnu-skl-1 asm-1]$ make
cc -S -o x.s x.c
sed -n
's/^.*@@@name@@@\([^@]*\)@@@value@@@[^0-9Xxa-fA-F-]*\([0-9Xxa-fA-F-][0-9Xxa-fA-F-]*\).*@@@end@@@.*$/#define
\1 \2/p' x.s > x.h
cat x.h
#define SIZEO_OF_FOO 4
[hjl at gnu-skl-1 asm-1]$ 

But this fails with clang:

[hjl at gnu-skl-1 asm-1]$ make CC=clang
clang -S  -o x.s x.c
x.c:9:12: error: unexpected token at start of statement
  __asm__ ("@@@name@@@SIZEO_OF_FOO@@@value@@@%0@@@end@@@" :: "i" (sizeo...
           ^
<inline asm>:1:2: note: instantiated into assembly here
        @@@name@@@SIZEO_OF_FOO@@@value@@@$4@@@end@@@
        ^
1 error generated.
make: *** [Makefile:16: x.s] Error 1
[hjl at gnu-skl-1 asm-1]$ 

Here the assembly output is never intended for assembler.  It is odd for
clang to complain what is inside of GCC asm statements.

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