[xen staging] libs/libs.mk: Rework target headers.chk dependencies

[patchbot@xxxxxxx]

commit 7547268c359eeef1a4d8e578c612e7cc9350992d
Author:     Anthony PERARD <anthony.perard@xxxxxxxxxx>
AuthorDate: Mon Aug 15 08:55:36 2022 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Mon Aug 15 08:55:36 2022 +0200

    libs/libs.mk: Rework target headers.chk dependencies
    
    There is no need to call the "headers.chk" target when it isn't
    wanted, so it never need to be .PHONY.
    
    Also, there is no more reason to separate the prerequisites from the
    recipe.
    
    Signed-off-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
    Reviewed-by: Juergen Gross <jgross@xxxxxxxx>
    Reviewed-by: Bertrand Marquis <bertrand.marquis@xxxxxxx>
---
 tools/libs/libs.mk | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/tools/libs/libs.mk b/tools/libs/libs.mk
index 7aee449370..f778a7df82 100644
--- a/tools/libs/libs.mk
+++ b/tools/libs/libs.mk
@@ -55,22 +55,20 @@ $(PKG_CONFIG_LOCAL): PKG_CONFIG_INCDIR = $(XEN_INCLUDE)
 $(PKG_CONFIG_LOCAL): PKG_CONFIG_LIBDIR = $(CURDIR)
 
 .PHONY: all
-all: headers.chk $(TARGETS) $(PKG_CONFIG_LOCAL) libxen$(LIBNAME).map 
$(LIBHEADERS)
+all: $(TARGETS) $(PKG_CONFIG_LOCAL) libxen$(LIBNAME).map $(LIBHEADERS)
 
 ifneq ($(NO_HEADERS_CHK),y)
-headers.chk:
+all: headers.chk
+
+headers.chk: $(LIBHEADERS) $(AUTOINCS)
        for i in $(filter %.h,$^); do \
            $(CC) -x c -ansi -Wall -Werror $(CFLAGS_xeninclude) \
                  -S -o /dev/null $$i || exit 1; \
            echo $$i; \
        done >$@.new
        mv $@.new $@
-else
-.PHONY: headers.chk
 endif
 
-headers.chk: $(LIBHEADERS) $(AUTOINCS)
-
 headers.lst: FORCE
        @{ set -e; $(foreach h,$(LIBHEADERS),echo $(h);) } > $@.tmp
        @$(call move-if-changed,$@.tmp,$@)
--
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