https://llvm.org/bugs/show_bug.cgi?id=25506
Bug ID: 25506
Summary: macro string concatenation does not generate the
expected result in an assembly macro
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: oliv...@labapart.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
When the macro '#define CONCAT(a, b) CONCAT2(a, b)' is declared, Clang inserts
the space between ',' and 'b' in the result when this macro is used in an
assembly macro definition (ie: '.macro').
For instance the call CONCAT(a, b) in an assembly macro would generate the
string 'a b' instead of 'ab'.
This use case is actually present in newlib source code
(https://sourceware.org/newlib/). GCC produces the expected result.
If I replace '#define CONCAT(a, b) CONCAT2(a, b)' by '#define CONCAT(a, b)
CONCAT2(a,b)' then the expected result is generated.
Here is the example:
----- hello.S -----
/* ANSI concatenation macros. */
#define CONCAT(a, b) CONCAT2(a, b)
#define CONCAT2(a, b) a##b
#ifndef __USER_LABEL_PREFIX__
#error __USER_LABEL_PREFIX__ not defined
#endif
#define SYM(x) CONCAT (__USER_LABEL_PREFIX__, x)
.text
.align
bl SYM(setjmp)
.macro FUNC_START name
.text
.align 2
.globl SYM (\name)
SYM (\name):
.endm
FUNC_START setjmp
bx lr
----------------------
$ clang-3.8 -target arm-none-eabi -c hello.S
<instantiation>:3:18: error: unexpected token in directive
.globl _ setjmp
^
hello.S:22:2: note: while in macro instantiation
FUNC_START setjmp
^
<instantiation>:4:9: error: unexpected token in argument list
_ setjmp:
^
hello.S:22:2: note: while in macro instantiation
FUNC_START setjmp
^
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