http://sourceware.org/bugzilla/show_bug.cgi?id=12557
H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|Firefox fails to build with |--as-needed doesn't work
|-flto and --as-needed |with g++
|LDFLAGS |
--- Comment #19 from H.J. Lu <hjl.tools at gmail dot com> 2011-03-11 18:36:35
UTC ---
[hjl@gnu-6 pr12557]$ cat x.c
int x = 20;
[hjl@gnu-6 pr12557]$ cat foo.c
#include <stdio.h>
extern int x;
void
foo ()
{
printf ("%d\n", x);
}
[hjl@gnu-6 pr12557]$ cat main.c
extern void foo ();
int
main ()
{
foo ();
return 0;
}
[hjl@gnu-6 pr12557]$ make
g++ -shared -fPIC -o libx.so x.c
g++ -shared -fPIC -o libfoo.so foo.c libx.so
g++ -Wl,--as-needed -o x main.o -L. -lfoo -lx -Wl,-R,.
main.o: In function `main':
main.c:(.text+0xa): undefined reference to `foo'
collect2: ld returned 1 exit status
make: *** [x] Error 1
[hjl@gnu-6 pr12557]$
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