http://llvm.org/bugs/show_bug.cgi?id=2627
Summary: clang doesn't understand "q"/"Q" constraint for __asm
Product: clang
Version: unspecified
Platform: Other
OS/Version: FreeBSD
Status: NEW
Severity: normal
Priority: P2
Component: parser
AssignedTo: [EMAIL PROTECTED]
ReportedBy: [EMAIL PROTECTED]
CC: [email protected]
Created an attachment (id=1884)
--> (http://llvm.org/bugs/attachment.cgi?id=1884)
builds with gcc, errors out with clang
FreeBSD's machine/endian.h on AMD64 contains the following definition:
#define __byte_swap_word_var(x) \
__extension__ ({ register __uint16_t __X = (x); \
__asm ("xchgb %h0, %b0" : "+Q" (__X)); \
__X; })
On i386, the definition is the same except with "+Q" replaced by "+q".
In both cases, clang exits with an error message complaining about the "+Q" or
"+q": "error: invalid output constraint in asm"
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