[LLVMbugs] [Bug 4287] New: Varargs + K&R doesn't work nicely

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=4287

           Summary: Varargs + K&R doesn't work nicely
           Product: clang
           Version: unspecified
          Platform: PC
        OS/Version: FreeBSD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Semantic Analyzer
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: ed at 80386.nl
                CC: llvmbugs at cs.uiuc.edu
            Blocks: 3696


The following code doesn't build with Clang, while it does build when using
GCC. This causes some build failures when building packages for FreeBSD:

#include <stdarg.h>
char *foo = "test";
#if defined(__STDC__) && __STDC__
int test(char*,...);
#endif

int test(fmt)
        char*fmt;
{
        va_list ap;
        char*a;
        int x;

        va_start(ap,fmt);
        a=va_arg(ap,char*);
        x=(a!=foo);
        va_end(ap);
        return x;
}

int main(argc,argv)
        int argc;char**argv;
{

        exit(test("",foo));
}

Error log:

conftest.c:7:5: error: conflicting types for 'test'
int test(fmt)
    ^
conftest.c:4:5: note: previous declaration is here
int test(char*,...);
    ^
conftest.c:14:2: error: 'va_start' used in function with fixed args
        va_start(ap,fmt);
        ^
/usr/include/stdarg.h:45:2: note: instantiated from:
        __builtin_va_start((ap), (last))
        ^
3 diagnostics generated.


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