https://llvm.org/bugs/show_bug.cgi?id=26337
Bug ID: 26337
Summary: extern "C" void fun(struct dummy, struct foo) doesn't
always work
Product: clang
Version: unspecified
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: hjl.to...@gmail.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
On x86-64, I got
[hjl@gnu-6 empty-1]$ cat emptya.c
#include "empty.h"
void fun(struct dummy d, struct foo f)
{
if (f.i1 != -1)
__builtin_abort();
}
[hjl@gnu-6 empty-1]$ cat empty.cc
#include "empty.h"
extern "C" void fun(struct dummy, struct foo);
int main()
{
struct dummy d;
struct foo f = { -1, -2, -3, -4, -5 };
fun(d, f);
return 0;
}
[hjl@gnu-6 empty-1]$ cat empty.h
#ifdef __x86_64__
# ifndef PAD_SIZE
# define PAD_SIZE 16
# endif
struct dummy0 { };
struct dummy { struct dummy0 d[PAD_SIZE]; };
#else
# ifndef PAD_SIZE
struct dummy { };
# else
struct dummy0 { };
struct dummy { struct dummy0 d[1]; };
# endif
#endif
struct foo
{
int i1;
int i2;
int i3;
int i4;
int i5;
};
[hjl@gnu-6 empty-1]$ make
/export/build/gnu/llvm-clang/build-x86_64-linux/bin/clang -m32 -c -O emptya.c
/export/build/gnu/llvm-clang/build-x86_64-linux/bin/clang++ -m32 -c -O empty.cc
/export/build/gnu/llvm-clang/build-x86_64-linux/bin/clang -m32 -o x emptya.o
empty.o
/export/build/gnu/llvm-clang/build-x86_64-linux/bin/clang -m32 -c -O -o
empty1a.o emptya.c -DPAD_SIZE=17
/export/build/gnu/llvm-clang/build-x86_64-linux/bin/clang++ -m32 -c -O -o
empty1.o empty.cc -DPAD_SIZE=17
/export/build/gnu/llvm-clang/build-x86_64-linux/bin/clang -m32 -o y empty1a.o
empty1.o
./x
./y
Makefile:17: recipe for target 'all' failed
make: *** [all] Aborted
[hjl@gnu-6 empty-1]$ make
/export/build/gnu/llvm-clang/build-x86_64-linux/bin/clang -c -O emptya.c
/export/build/gnu/llvm-clang/build-x86_64-linux/bin/clang++ -c -O empty.cc
/export/build/gnu/llvm-clang/build-x86_64-linux/bin/clang -o x emptya.o empty.o
/export/build/gnu/llvm-clang/build-x86_64-linux/bin/clang -c -O -o empty1a.o
emptya.c -DPAD_SIZE=17
/export/build/gnu/llvm-clang/build-x86_64-linux/bin/clang++ -c -O -o empty1.o
empty.cc -DPAD_SIZE=17
/export/build/gnu/llvm-clang/build-x86_64-linux/bin/clang -o y empty1a.o
empty1.o
./x
./y
Makefile:17: recipe for target 'all' failed
make: *** [all] Aborted
[hjl@gnu-6 empty-1]$
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