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kbuild: rename cmd_$@ to savedcmd_$@ in *.cmd files

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The cmd-check macro compares $(cmd_$@) and $(cmd_$1), but a pitfall is
that you cannot use cmd_<target> as the variable name for the command.

For example, the following code will not work in the top Makefile
or ./Kbuild.

    quiet_cmd_foo = GEN     $@
          cmd_foo = touch $@

    targets += foo
    foo: FORCE
            $(call if_changed,foo)

In this case, both $@ and $1 are expanded to 'foo', so $(cmd_check)
is always empty.

We do not need to use the same prefix for cmd_$@ and cmd_$1.
Rename the former to savedcmd_$@.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Nicolas Schier <nicolas@fjasle.eu>
This commit is contained in:
Masahiro Yamada
2022-12-29 18:15:00 +09:00
parent 91ecf7ff1b
commit 92215e7a80
4 changed files with 8 additions and 8 deletions
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4
scripts/basic/fixdep.c
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@@ -70,7 +70,7 @@
*
* It first generates a line
*
* cmd_<target> = <cmdline>
* savedcmd_<target> = <cmdline>
*
* and then basically copies the .<target>.d file to stdout, in the
* process filtering out the dependency on autoconf.h and adding
@@ -343,7 +343,7 @@ int main(int argc, char *argv[])
target = argv[2];
cmdline = argv[3];
printf("cmd_%s := %s\n\n", target, cmdline);
printf("savedcmd_%s := %s\n\n", target, cmdline);
buf = read_file(depfile);
parse_dep_file(buf, target);