http://llvm.org/bugs/show_bug.cgi?id=22115
Bug ID: 22115
Summary: PPC32: Base pointer clobbered with -fPIC
Product: clang
Version: 3.5
Hardware: Other
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Created attachment 13646
--> http://llvm.org/bugs/attachment.cgi?id=13646&action=edit
Output from clang -fPIC -S for foo.c
clang uses R30 as a pointer to a compilation-unit specific constant pool, but
does not save it in either the caller or callee in cross-compilation-unit
calls.
If the following example:
--8<-- foo.c --8<--
#include <stdio.h>
int foo()
{
fprintf(stderr, "Two\n");
return 0;
}
void dummy()
{
fprintf(stderr, "Gotcha\n");
}
--8<-- bar.c --8<--
#include <stdio.h>
extern int foo(void);
int bar()
{
fprintf(stderr, "One\n");
int r = foo();
fprintf(stderr, "Three\n");
return r;
}
--8<--
is compiled with -fPIC, the output printed by bar() becomes
One
Two
Gothca
instead of the correct
One
Two
Three
Attaching assembler code generated by clang.
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