linux-kernel - [PATCH 2/3] tools/nolibc: make the default target build the headers

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Date:   Sat, 28 May 2022 17:45:45 +0200
From:   Willy Tarreau <w@....eu>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     "Paul E . McKenney" <paulmck@...nel.org>,
        linux-kernel@...r.kernel.org, Willy Tarreau <w@....eu>
Subject: [PATCH 2/3] tools/nolibc: make the default target build the headers

The help in "make -C tools" enumerates nolibc as a valid target so we
must at least make it do something. Let's make it do the equivalent
of "make headers" in that it will prepare a sysroot with the arch's
headers, but will not install the kernel's headers. This is the
minimum some tools will need when built with a full-blown toolchain
anyway.

Signed-off-by: Willy Tarreau <w@....eu>
---
 tools/Makefile                | 3 +++
 tools/include/nolibc/Makefile | 2 +-
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/tools/Makefile b/tools/Makefile
index c074e42fd92f..e497875fc7e3 100644
--- a/tools/Makefile
+++ b/tools/Makefile
@@ -78,6 +78,9 @@ bpf/%: FORCE
 libapi: FORCE
 	$(call descend,lib/api)
 
+nolibc: FORCE
+	$(call descend,include/nolibc)
+
 nolibc_%: FORCE
 	$(call descend,include/nolibc,$(patsubst nolibc_%,%,$@))
 
diff --git a/tools/include/nolibc/Makefile b/tools/include/nolibc/Makefile
index e8bac6ef3653..9768819abd55 100644
--- a/tools/include/nolibc/Makefile
+++ b/tools/include/nolibc/Makefile
@@ -29,7 +29,7 @@ all_files := ctype.h errno.h nolibc.h signal.h std.h stdio.h stdlib.h string.h \
              sys.h time.h types.h unistd.h
 
 # install all headers needed to support a bare-metal compiler
-all:
+all: headers
 
 # Note: when ARCH is "x86" we concatenate both x86_64 and i386
 headers:
-- 
2.17.5