http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58289
Bug ID: 58289
Summary: gcc/gengtype.c includes gcc/double-int.h, which uses
C++ constructs
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: bootstrap
Assignee: unassigned at gcc dot gnu.org
Reporter: jklowden at schemamania dot org
I pulled from svn://gcc.gnu.org/svn/gcc/trunk today to build gcc on OS X using
Clang. Some header files use C++ syntax, but are included in C files. The
error I'm seeing is:
/Developer/usr/bin/clang [...options omitted...]
-o build/gengtype.o ../../gcc/gengtype.c
[...warnings ommitted...]
In file included from ../../gcc/gengtype.c:28:
../../gcc/double-int.h:58:10: error: must use 'struct' tag to refer to type
'double_int'
static double_int from_uhwi (unsigned HOST_WIDE_INT cst);
The error stems from this construct in double-int.h:
==snip==
struct double_int
{
/* Normally, we would define constructors to create instances.
Two things prevent us from doing so.
First, defining a constructor makes the class non-POD in C++03,
and we certainly want double_int to be a POD.
Second, the GCC conding conventions prefer explicit conversion,
and explicit conversion operators are not available until C++11. */
static double_int from_uhwi (unsigned HOST_WIDE_INT cst);
==pins==
Comment not withstanding, the file could easily be converted to C; there are no
classes declared, for instance. All that's needed is say,
static struct double-int from_uhwi = cst;
perhaps with a cast.
I found similar problems in two other files that were small enough to repair or
work around. This file seems to be a pupa determined to become C++, and I'm
not quite sure what should be done.
