linux-kernel - Re: tools/build/Build.include: fix # escaping in .cmd files for future Make

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Date:   Tue, 10 Jul 2018 16:49:10 +0200
From:   Paul Menzel <pmenzel@...gen.mpg.de>
To:     Rasmus Villemoes <linux@...musvillemoes.dk>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     Randy Dunlap <rdunlap@...radead.org>, linux-kbuild@...r.kernel.org,
        linux-kernel@...r.kernel.org, zibeon@...il.com
Subject: Re: tools/build/Build.include: fix # escaping in .cmd files for
 future Make

Date: Tue, 5 Jun 2018 19:00:22 +0200

In 2016 GNU Make made a backwards incompatible change to the way '#'
characters were handled in Makefiles when used inside functions or
macros:

http://git.savannah.gnu.org/cgit/make.git/commit/?id=c6966b323811c37acedff05b57

Due to this change, when attempting to run `make prepare' I get a
spurious make syntax error:

    /home/earnest/linux/tools/objtool/.fixdep.o.cmd:1: *** missing separator.  Stop.

When inspecting `.fixdep.o.cmd' it includes two lines which use
unescaped comment characters at the top:

    \# cannot find fixdep (/home/earnest/linux/tools/objtool//fixdep)
    \# using basic dep data

This is because `tools/build/Build.include' prints these '\#'
characters:

    printf '\# cannot find fixdep (%s)\n' $(fixdep) > $(dot-target).cmd; \
    printf '\# using basic dep data\n\n' >> $(dot-target).cmd;           \

This completes commit 9564a8cf (Kbuild: fix # escaping in .cmd files for
future Make).

Link: https://bugzilla.kernel.org/show_bug.cgi?id=197847
Cc: Randy Dunlap <rdunlap@...radead.org>
Cc: Rasmus Villemoes <linux@...musvillemoes.dk>
Cc: Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc: stable@...r.kernel.org
Signed-off-by: Paul Menzel <pmenzel@...gen.mpg.de>
---
v2: Added stable@...r.kernel.org

 tools/build/Build.include | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/build/Build.include b/tools/build/Build.include
index a4bbb984941d..d9048f145f97 100644
--- a/tools/build/Build.include
+++ b/tools/build/Build.include
@@ -63,8 +63,8 @@ dep-cmd = $(if $(wildcard $(fixdep)),
            $(fixdep) $(depfile) $@ '$(make-cmd)' > $(dot-target).tmp;           \
            rm -f $(depfile);                                                    \
            mv -f $(dot-target).tmp $(dot-target).cmd,                           \
-           printf '\# cannot find fixdep (%s)\n' $(fixdep) > $(dot-target).cmd; \
-           printf '\# using basic dep data\n\n' >> $(dot-target).cmd;           \
+           printf '$(pound) cannot find fixdep (%s)\n' $(fixdep) > $(dot-target).cmd; \
+           printf '$(pound) using basic dep data\n\n' >> $(dot-target).cmd;           \
            cat $(depfile) >> $(dot-target).cmd;                                 \
            printf '\n%s\n' 'cmd_$@ := $(make-cmd)' >> $(dot-target).cmd)
 
-- 
2.16.2


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