http://llvm.org/bugs/show_bug.cgi?id=4253
Summary: available_externally causes wrong PIC code generation
Product: new-bugs
Version: unspecified
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P2
Component: new bugs
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Created an attachment (id=3019)
--> (http://llvm.org/bugs/attachment.cgi?id=3019)
tst.i
$ clang tst.i -fPIC -o tst.o -c
$ gcc -shared -o tst.so tst.o
/usr/bin/ld: tst.o: relocation R_X86_64_PC32 against undefined symbol
`atoi@@GLIBC_2.2.5' can not be used when making a shared object; recompile with
-fPIC
The IR looks like this:
define available_externally fastcc i32 @atoi(i8* %__nptr) nounwind readonly {
entry:
%call = tail call i64 @strtol(i8* nocapture %__nptr, i8** null, i32 10)
nounwind readonly ; <i64> [#uses=1]
%conv = trunc i64 %call to i32 ; <i32> [#uses=1]
ret i32 %conv
}
If I remove the 'available_externally' flag the file is compiled correctly.
The problem is that llc emits this for available_externally, probably thinking
that atoi is a local function:
call atoi
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