When an externally_visible function calls another externally_visible function,
this gives R_X86_64_PC32 from ld.
-bash-3.2$ /opt/gcc/bin/gcc -v
Using built-in specs.
Target: x86_64-unknown-linux-gnu
Configured with: ../gcc-4.4.0/configure --prefix=/opt/gcc
Thread model: posix
gcc version 4.4.0 (GCC)
-bash-3.2$ cat whole.c
__attribute__((externally_visible))
int function(int a, int b) {
return a + b;
}
__attribute__((externally_visible))
int test(int a, int b) {
return function(a, b);
}
-bash-3.2$ /opt/gcc/bin/gcc -fPIC -O1 -shared -fwhole-program -save-temps -o
whole.so whole.c
/opt/binutils/bin/ld: whole.o: relocation R_X86_64_PC32 against symbol
`function' can not be used when making a shared object; recompile with -fPIC
/opt/binutils/bin/ld: final link failed: Bad value
collect2: ld returned 1 exit status
-bash-3.2$ cat whole.i
# 1 "whole.c"
# 1 "<built-in>"
# 1 "<command-line>"
# 1 "whole.c"
__attribute__((externally_visible))
int function(int a, int b) {
return a + b;
}
__attribute__((externally_visible))
int test(int a, int b) {
return function(a, b);
}
-bash-3.2$ mv whole.s wholebug.s
-bash-3.2$ /opt/gcc/bin/gcc -fPIC -O1 -shared -save-temps -o whole.so whole.c
-bash-3.2$ diff -u whole.s wholebug.s
--- whole.s 2009-06-24 17:37:26.000000000 +0200
+++ wholebug.s 2009-06-24 17:37:21.000000000 +0200
@@ -15,10 +15,8 @@
test:
.LFB1:
.cfi_startproc
- subq $8, %rsp
- .cfi_def_cfa_offset 16
- call funct...@plt
- addq $8, %rsp
+ call function
+ rep
ret
.cfi_endproc
.LFE1:
--
Summary: -fwhole-program -shared with externally_visible gives
R_X86_64_PC32 errors
Product: gcc
Version: 4.4.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: gcc at natvig dot com
GCC build triplet: x86_64-unknown-linux-gnu
GCC host triplet: x86_64-unknown-linux-gnu
GCC target triplet: x86_64-unknown-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40546
