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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - error: unexpected token at start of statement on GCC asm statements"
href="https://bugs.llvm.org/show_bug.cgi?id=33909">33909</a>
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<tr>
<th>Summary</th>
<td>error: unexpected token at start of statement on GCC asm statements
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>new bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>hjl.tools@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>GCC asm statements are used to get target properties with a cross compiler
without compiling and running a program:
[hjl@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@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@@@.*$/#define
\1 \2/p' x.s > x.h
cat x.h
#define SIZEO_OF_FOO 4
[hjl@gnu-skl-1 asm-1]$
But this fails with clang:
[hjl@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@@@$4@@@end@@@
^
1 error generated.
make: *** [Makefile:16: x.s] Error 1
[hjl@gnu-skl-1 asm-1]$
Here the assembly output is never intended for assembler. It is odd for
clang to complain what is inside of GCC asm statements.</pre>
</div>
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