tools/resolve_btfids: Pass HOSTCFLAGS as EXTRA_CFLAGS to prepare targets

Bugzilla: https://bugzilla.redhat.com/2178930

commit 2531ba0
Author: Jiri Olsa <jolsa@kernel.org>
Date:   Thu Feb 9 15:37:35 2023 +0100

    tools/resolve_btfids: Pass HOSTCFLAGS as EXTRA_CFLAGS to prepare targets
    
    Thorsten reported build issue with command line that defined extra
    HOSTCFLAGS that were not passed into 'prepare' targets, but were
    used to build resolve_btfids objects.
    
    This results in build fail when these objects are linked together:
    
      /usr/bin/ld: /build.../tools/bpf/resolve_btfids//libbpf/libbpf.a(libbpf-in.o):
      relocation R_X86_64_32 against `.rodata.str1.1' can not be used when making a PIE \
      object; recompile with -fPIE
    
    Fixing this by passing HOSTCFLAGS in EXTRA_CFLAGS as part of
    HOST_OVERRIDES variable for prepare targets.
    
    [1] https://lore.kernel.org/bpf/f7922132-6645-6316-5675-0ece4197bfff@leemhuis.info/
    
    Fixes: 56a2df7 ("tools/resolve_btfids: Compile resolve_btfids as host program")
    Reported-by: Thorsten Leemhuis <linux@leemhuis.info>
    Signed-off-by: Jiri Olsa <jolsa@kernel.org>
    Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
    Tested-by: Thorsten Leemhuis <linux@leemhuis.info>
    Acked-by: Ian Rogers <irogers@google.com>
    Link: https://lore.kernel.org/bpf/20230209143735.4112845-1-jolsa@kernel.org

Signed-off-by: Viktor Malik <vmalik@redhat.com>

Author: viktormalik

tools/bpf/resolve_btfids/Makefile

@@ -19,7 +19,7 @@ endif
 
 # Overrides for the prepare step libraries.
 HOST_OVERRIDES := AR="$(HOSTAR)" CC="$(HOSTCC)" LD="$(HOSTLD)" ARCH="$(HOSTARCH)" \
-		  CROSS_COMPILE=""
+		  CROSS_COMPILE="" EXTRA_CFLAGS="$(HOSTCFLAGS)"
 
 RM      ?= rm
 HOSTCC  ?= gcc