http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49702
Summary: Undefined static functions resolve to external
definitions
Product: gcc
Version: 4.7.0
Status: UNCONFIRMED
Keywords: accepts-invalid, wrong-code
Severity: normal
Priority: P3
Component: c
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: rgue...@gcc.gnu.org
main.c:
-------
static int foo(); int main () { return foo(); }
t.c:
----
int foo() { return 0; }
> gcc -o t t1.c t.c
t.c:1: warning: ‘foo’ used but never defined
> ./t
> echo $?
0
> g++ -o t t1.c t.c
t.c:1: error: ‘int foo()’ used but never defined
For the C frontend you need -pedantic-errors to make it reject main.c.
Without -pedantic-errors wrong code is emitted:
Relocation section '.rela.eh_frame' at offset 0x5a8 contains 1 entries:
Offset Info Type Sym. Value Sym. Name +
Addend
000000000020 00020000000a R_X86_64_32 0000000000000000 .text + 0
Symbol table '.symtab' contains 11 entries:
Num: Value Size Type Bind Vis Ndx Name
...
9: 0000000000000000 16 FUNC GLOBAL DEFAULT 1 main
10: 0000000000000000 0 NOTYPE GLOBAL DEFAULT UND foo
but that's hardly possible to improve without erroring out by default.
Is there a way to only make the assembler reject the code (if maybe
a toplevel asm contains the local symbol?)?
