Unable to override calling convention for individual functions when using -mrtd

[Quuxplusone]

Bugzilla Link	PR10591
Status	RESOLVED FIXED
Importance	P normal
Reported by	Dimitry Andric (dimitry@andric.com)
Reported on	2011-08-04 17:33:50 -0700
Last modified on	2011-08-05 11:37:45 -0700
Version	trunk
Hardware	PC All
CC	efriedma@quicinc.com, geek4civic@gmail.com, llvm-bugs@lists.llvm.org, pawel.worach@gmail.com, rdivacky@freebsd.org
Fixed by commit(s)
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When you compile a program with -mrtd, the default calling convention
will be switched to stdcall.  However, you should be able to override
this for individual functions, as stated here:

http://gcc.gnu.org/onlinedocs/gcc-4.6.1/gcc/Function-Attributes.html#index-mrtd-2410

"cdecl -- On the Intel 386, the cdecl attribute causes the compiler to
assume that the calling function will pop off the stack space used to
pass arguments. This is useful to override the effects of the -mrtd
switch."

However, it looks like clang forces every function to have the stdcall
convention, and then errors out whenever you attempt to override it for
a particular function:

  void __attribute__((cdecl)) foo(int i) {}
  void bar(int i) {}

This compiles fine using 'gcc -mrtd -c', but 'clang -mrtd -c' complains:

  convtest.c:1:21: error: cdecl and stdcall attributes are not compatible
  void __attribute__((cdecl)) foo(int i) {}
              ^
  1 error generated.

It would be nice if we could get similar behaviour from clang.

[Quuxplusone]

fixed in r136971.