Bug 17847

Summary:	Confusing linker error message
Product:	binutils	Reporter:	H.J. Lu <hjl.tools>
Component:	ld	Assignee:	Not yet assigned to anyone <unassigned>
Status:	RESOLVED FIXED
Severity:	normal
Priority:	P2
Version:	2.26
Target Milestone:	2.26
Host:		Target:
Build:		Last reconfirmed:

Description H.J. Lu 2015-01-15 17:14:09 UTC

[hjl@gnu-6 pie-6]$ cat x.S
	.text
	.global _start
_start:
	movl	foo(%rip), %eax
[hjl@gnu-6 pie-6]$ make
gcc -B./    -c -o x.o x.S
./ld -o x -pie x.o
x.o: In function `_start':
(.text+0x2): undefined reference to `foo'
./ld: x.o: relocation R_X86_64_PC32 against undefined symbol `foo' can not be used when making a shared object; recompile with -fPIC
./ld: final link failed: Bad value
make: *** [x] Error 1
[hjl@gnu-6 pie-6]$ 

Since foo is undefined, the second error message is confusing.

Comment 1 Sourceware Commits 2015-01-15 19:09:50 UTC

The master branch has been updated by H.J. Lu <hjl@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=6333bc0dd6e92dd5a76ba0a6890e08db2a6f7a29

commit 6333bc0dd6e92dd5a76ba0a6890e08db2a6f7a29
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Thu Jan 15 11:06:33 2015 -0800

    Don't complain about -fPIC for undefined symbol
    
    When building executable, undefined symbol is a fatal error.  We don't
    complain about -fPIC if the symbol is undefined.
    
    bfd/
    
    	PR ld/17847
    	* elf64-x86-64.c (elf_x86_64_relocate_section): Don't complain
    	about -fPIC if the symbol is undefined when building executable.
    
    ld/testsuite/
    
    	PR ld/17847
    	* ld-x86-64/pie1.d: New file.
    	* ld-x86-64/pie1.s: Likwise.
    	* ld-x86-64/x86-64.exp: Run pie1.

Comment 2 H.J. Lu 2015-01-15 19:12:30 UTC

Fixed.