On Thu, Mar 12, 2015 at 7:09 PM, Kevin Kofler <kevin.kofler@xxxxxxxxx> wrote:
> Don't use __attribute__((alias(foo_gmp))), use asm("foo_gmp"), as per:
> https://gcc.gnu.org/onlinedocs/gcc-4.9.2/gcc/Asm-Labels.html
We need both names available, the "_gmp"-suffixed version for
polymake, and the standard version for everything else. The asm trick
doesn't seem to accomplish that. Here is the contents of test.c:
extern int foo_gmp (int x) asm ("foo");
int foo_gmp (int x) {
return x + 1;
}
extern int bar (int x) __attribute__((alias("bar_gmp")));
int bar_gmp (int x) {
return x - 1;
}
Compile with something like "gcc -c test.c", then run "readelf -a
test.o". You'll see the symbol table looks like this:
Symbol table '.symtab' contains 17 entries:
Num: Value Size Type Bind Vis Ndx Name
0: 0000000000000000 0 NOTYPE LOCAL DEFAULT UND
1: 0000000000000000 0 FILE LOCAL DEFAULT ABS test.c
2: 0000000000000000 0 SECTION LOCAL DEFAULT 1
3: 0000000000000000 0 SECTION LOCAL DEFAULT 2
4: 0000000000000000 0 SECTION LOCAL DEFAULT 3
5: 0000000000000000 0 SECTION LOCAL DEFAULT 4
6: 0000000000000000 0 SECTION LOCAL DEFAULT 5
7: 0000000000000000 0 SECTION LOCAL DEFAULT 7
8: 0000000000000000 0 SECTION LOCAL DEFAULT 8
9: 0000000000000000 0 SECTION LOCAL DEFAULT 10
10: 0000000000000000 0 SECTION LOCAL DEFAULT 12
11: 0000000000000000 0 SECTION LOCAL DEFAULT 14
12: 0000000000000000 0 SECTION LOCAL DEFAULT 15
13: 0000000000000000 0 SECTION LOCAL DEFAULT 13
14: 0000000000000000 4 FUNC GLOBAL DEFAULT 1 foo
15: 0000000000000010 4 FUNC GLOBAL DEFAULT 1 bar_gmp
16: 0000000000000010 4 FUNC GLOBAL DEFAULT 1 bar
So the asm approach changes the name that is emitted, rather than
aliasing it. Thanks for the suggestion, though.
--
Jerry James
http://www.jamezone.org/
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