bpf: install a wrapping stdint.h for bpf-none-unknown targets

This patch makes GCC to wrap the host's stdint.h header when operating
in the default hosted/non-freestanding mode.  It is thus up to the
user to provide a suitable standard header unless -ffreestanding gets
explicitly passed in the compilation line.

A few tests that use stdint.h are adapted to explicitly pass
-ffreestanding.

Tested in a x86_64-linux-gnu host with target bpf-unknown-none.

gcc/ChangeLog:

	* config.gcc: install a wrapping stdint.h in bpf targets.

gcc/testsuite/ChangeLog:

	* gcc.target/bpf/diag-funargs-2.c: Use -ffreestanding.
	* gcc.target/bpf/helper-skb-ancestor-cgroup-id.c: Likewise.
	* gcc.target/bpf/helper-bind.c: Likewise.
	* gcc.target/bpf/diag-funargs-3.c: Likewise.

1 files changed, 1 insertions, 1 deletions

diff --git a/gcc/config.gcc b/gcc/config.gcc
index c014735..55e3714 100644
--- a/gcc/config.gcc
+++ b/gcc/config.gcc
@@ -1690,7 +1690,7 @@ bpf-*-*)
         tm_file="elfos.h ${tm_file}"
         tmake_file="${tmake_file} bpf/t-bpf"
         use_collect2=no
-        use_gcc_stdint=provide
+        use_gcc_stdint=wrap
         extra_objs="btfext-out.o core-builtins.o"
         target_gtfiles="$target_gtfiles \$(srcdir)/config/bpf/btfext-out.cc \$(srcdir)/config/bpf/core-builtins.cc"
         ;;