http://llvm.org/bugs/show_bug.cgi?id=10591
Summary: Unable to override calling convention for individual
functions when using -mrtd
Product: new-bugs
Version: trunk
Platform: PC
OS/Version: All
Status: NEW
Severity: normal
Priority: P
Component: new bugs
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
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.
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