Re: maintainer-makefile: catch uses of $< in non-implicit rules

[Tim Rühsen]

Hi Akim,

the command expands to

if gawk --version | grep GNU >/dev/null 2>&1; then              \
  (cd . && autoconf --trace AC_CONFIG_FILES:'$1') |     \
    tr ' ' '\n' |                                               \
    /usr/bin/sed -ne '/Makefile/{s/\.in$//;p;}' |                       \
    while read m; do                                            \
      make -qp -f $m .DUMMY-TARGET 2>/dev/null |                \
        gawk -v file=$m -e 'BEGIN { RS = "\n\n"; in_rules = 0; } /^#
Files/ { in_rules = 1; } /\$</ && in_rules && $0 !~ /^(.*\n)*
\.\w+(\.\w+)?:/ { print "Error: " file ": $< in a non implicit rule\n"
$0; status = 1; } END { exit status; }' || exit 1;        \
    done;                                                       \
fi

# make --version
GNU Make 4.2.1
Built for x86_64-redhat-linux-gnu

# gawk --version
GNU Awk 4.2.1, API: 2.0 (GNU MPFR 3.1.6-p2, GNU MP 6.1.2)

# sed --version
sed (GNU sed) 4.5

# tr --version
tr (GNU coreutils) 8.31

# autoconf --version
autoconf (GNU Autoconf) 2.69


Regards, Tim

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