http://llvm.org/bugs/show_bug.cgi?id=19529
Bug ID: 19529
Summary: Macro expansion not performed on pragma arguments when
using -save-temps
Product: clang
Version: 3.4
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Created attachment 12424
--> http://llvm.org/bugs/attachment.cgi?id=12424&action=edit
C test case
Consider the following C code:
#define PACK_SZ 1
#pragma pack(PACK_SZ)
struct s1 {
char a;
int b;
};
struct s1 myst;
----------------------------------------
When compiling it without '-save-temps',
the pragma is correctly handled:
----------------------------------------
> clang pragma_pack.c -O2 -S -emit-llvm
> cat pragma_pack.ll
[...]
%struct.s1 = type <{ i8, i32 }>
@myst = common global %struct.s1 zeroinitializer, align 1
[...]
-----------------------------------------------
When compiling it with '-save-temps', the macro
is not expanded and the pragma is then ignored:
-----------------------------------------------
> clang pragma_pack.c -O2 -S -emit-llvm -save-temps
pragma_pack.c:4:14: warning: unknown action for '#pragma pack' - ignored
#pragma pack(PACK_SZ)
^
1 warning generated.
> cat
[...]
%struct.s1 = type { i8, i32 }
@myst = common global %struct.s1 zeroinitializer, align 4
[...]
The problem has been reproduced with other pragmas.
The problem is present in CLANG 3.4, but likely in other version as well.
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