http://llvm.org/bugs/show_bug.cgi?id=14669
Bug #: 14669
Summary: CLang's incompatiblity with gcc related to alignment
of data fields in structure when passing structure .
Product: clang
Version: 3.1
Platform: PC
OS/Version: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Frontend
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Classification: Unclassified
Created attachment 9744
--> http://llvm.org/bugs/attachment.cgi?id=9744
The Test files for the issue.
There seems to be some incompatiblity between Clang and Gcc with regard to
alignment of fields inside structure when a structure data is passed from clang
built code to gcc built code and vice-versa.
The attached test clearly shows the difference in alignment when run.
For the test case, g.c file has been compiled with gcc.
c.c file has been compiled with c.c .
And both files pass have function calls to pass arguments to function in other
file.
The execution steps we undertook are as:
clang m.c -c -o m.o
clang c.c -c -o c.o
gcc g.c -c -o g.o
clang m.o c.o g.o -lm -o a.out
./a.out
One separte example is :
struct test{
unsigned long long int a2;
__attribute__((aligned)) char * b;
};
int main(){
int a;
test a1;
a = __alignof__(a1.a2);
}
For gcc, the value of a is 4.
For Clang , the value is 8.
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