-if test "x$visibility" = xauto ; then
-# This test checks toolchain support for several things:
-# - the -include option
-# - the attributes/pragmas used in vis.h
-# - linking code that takes the address of protected symbols
-# - gcc 3.x bug that wrongly claims declarations mismatch
-printf "checking whether global visibility preinclude works... "
-cat > "$tmpc" <<EOF
-__attribute__((__visibility__("default")))
-extern struct a *const x;
-typedef struct a b;
-extern b *const x;
-b *const x;
-int (*fp)(void);
-int foo(void) { }
-int bar(void) { fp = foo; return foo(); }
-EOF
-if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS \
- -DSHARED -fPIC -I$srcdir/src/internal -include vis.h \
- -nostdlib -shared -Wl,-Bsymbolic-functions \
- -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
-visibility=yes
+# Determine if the compiler produces position-independent code (PIC)
+# by default. If so, we don't need to compile separate object files
+# for libc.a and libc.so.
+if trycppif __PIC__ "$CFLAGS_C99FSE $CPPFLAGS $CFLAGS" ; then
+pic_default=yes