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Add configure-time check for protobuf, zstd, cmake when --enable-pax is specified
When building with --enable-pax, the build now checks for the presence of protobuf (version >= 3.5.0) using pkg-config. If protobuf is not found, configure will fail with an appropriate error message. This ensures that missing dependencies are caught early in the build process.
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‎config/ax_compare_version.m4‎

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# ===========================================================================
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# https://www.gnu.org/software/autoconf-archive/ax_compare_version.html
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# ===========================================================================
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#
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# SYNOPSIS
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#
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# AX_COMPARE_VERSION(VERSION_A, OP, VERSION_B, [ACTION-IF-TRUE], [ACTION-IF-FALSE])
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#
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# DESCRIPTION
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#
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# This macro compares two version strings. Due to the various number of
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# minor-version numbers that can exist, and the fact that string
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# comparisons are not compatible with numeric comparisons, this is not
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# necessarily trivial to do in a autoconf script. This macro makes doing
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# these comparisons easy.
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#
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# The six basic comparisons are available, as well as checking equality
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# limited to a certain number of minor-version levels.
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#
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# The operator OP determines what type of comparison to do, and can be one
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# of:
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#
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# eq - equal (test A == B)
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# ne - not equal (test A != B)
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# le - less than or equal (test A <= B)
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# ge - greater than or equal (test A >= B)
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# lt - less than (test A < B)
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# gt - greater than (test A > B)
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#
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# Additionally, the eq and ne operator can have a number after it to limit
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# the test to that number of minor versions.
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#
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# eq0 - equal up to the length of the shorter version
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# ne0 - not equal up to the length of the shorter version
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# eqN - equal up to N sub-version levels
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# neN - not equal up to N sub-version levels
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#
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# When the condition is true, shell commands ACTION-IF-TRUE are run,
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# otherwise shell commands ACTION-IF-FALSE are run. The environment
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# variable 'ax_compare_version' is always set to either 'true' or 'false'
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# as well.
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#
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# Examples:
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#
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# AX_COMPARE_VERSION([3.15.7],[lt],[3.15.8])
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# AX_COMPARE_VERSION([3.15],[lt],[3.15.8])
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#
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# would both be true.
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#
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# AX_COMPARE_VERSION([3.15.7],[eq],[3.15.8])
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# AX_COMPARE_VERSION([3.15],[gt],[3.15.8])
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#
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# would both be false.
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#
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# AX_COMPARE_VERSION([3.15.7],[eq2],[3.15.8])
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#
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# would be true because it is only comparing two minor versions.
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#
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# AX_COMPARE_VERSION([3.15.7],[eq0],[3.15])
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#
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# would be true because it is only comparing the lesser number of minor
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# versions of the two values.
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#
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# Note: The characters that separate the version numbers do not matter. An
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# empty string is the same as version 0. OP is evaluated by autoconf, not
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# configure, so must be a string, not a variable.
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#
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# The author would like to acknowledge Guido Draheim whose advice about
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# the m4_case and m4_ifvaln functions make this macro only include the
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# portions necessary to perform the specific comparison specified by the
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# OP argument in the final configure script.
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#
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# LICENSE
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#
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# Copyright (c) 2008 Tim Toolan <toolan@ele.uri.edu>
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#
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# Copying and distribution of this file, with or without modification, are
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# permitted in any medium without royalty provided the copyright notice
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# and this notice are preserved. This file is offered as-is, without any
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# warranty.
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#serial 13
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dnl #########################################################################
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AC_DEFUN([AX_COMPARE_VERSION], [
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AC_REQUIRE([AC_PROG_AWK])
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# Used to indicate true or false condition
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ax_compare_version=false
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# Convert the two version strings to be compared into a format that
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# allows a simple string comparison. The end result is that a version
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# string of the form 1.12.5-r617 will be converted to the form
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# 0001001200050617. In other words, each number is zero padded to four
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# digits, and non digits are removed.
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AS_VAR_PUSHDEF([A],[ax_compare_version_A])
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A=`echo "$1" | sed -e 's/\([[0-9]]*\)/Z\1Z/g' \
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-e 's/Z\([[0-9]]\)Z/Z0\1Z/g' \
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-e 's/Z\([[0-9]][[0-9]]\)Z/Z0\1Z/g' \
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-e 's/Z\([[0-9]][[0-9]][[0-9]]\)Z/Z0\1Z/g' \
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-e 's/[[^0-9]]//g'`
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AS_VAR_PUSHDEF([B],[ax_compare_version_B])
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B=`echo "$3" | sed -e 's/\([[0-9]]*\)/Z\1Z/g' \
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-e 's/Z\([[0-9]]\)Z/Z0\1Z/g' \
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-e 's/Z\([[0-9]][[0-9]]\)Z/Z0\1Z/g' \
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-e 's/Z\([[0-9]][[0-9]][[0-9]]\)Z/Z0\1Z/g' \
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-e 's/[[^0-9]]//g'`
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dnl # In the case of le, ge, lt, and gt, the strings are sorted as necessary
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dnl # then the first line is used to determine if the condition is true.
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dnl # The sed right after the echo is to remove any indented white space.
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m4_case(m4_tolower($2),
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[lt],[
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ax_compare_version=`echo "x$A
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x$B" | sed 's/^ *//' | sort -r | sed "s/x${A}/false/;s/x${B}/true/;1q"`
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],
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[gt],[
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ax_compare_version=`echo "x$A
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x$B" | sed 's/^ *//' | sort | sed "s/x${A}/false/;s/x${B}/true/;1q"`
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],
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[le],[
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ax_compare_version=`echo "x$A
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x$B" | sed 's/^ *//' | sort | sed "s/x${A}/true/;s/x${B}/false/;1q"`
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],
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[ge],[
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ax_compare_version=`echo "x$A
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x$B" | sed 's/^ *//' | sort -r | sed "s/x${A}/true/;s/x${B}/false/;1q"`
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],[
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dnl Split the operator from the subversion count if present.
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m4_bmatch(m4_substr($2,2),
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[0],[
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# A count of zero means use the length of the shorter version.
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# Determine the number of characters in A and B.
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ax_compare_version_len_A=`echo "$A" | $AWK '{print(length)}'`
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ax_compare_version_len_B=`echo "$B" | $AWK '{print(length)}'`
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# Set A to no more than B's length and B to no more than A's length.
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A=`echo "$A" | sed "s/\(.\{$ax_compare_version_len_B\}\).*/\1/"`
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B=`echo "$B" | sed "s/\(.\{$ax_compare_version_len_A\}\).*/\1/"`
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],
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[[0-9]+],[
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# A count greater than zero means use only that many subversions
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A=`echo "$A" | sed "s/\(\([[0-9]]\{4\}\)\{m4_substr($2,2)\}\).*/\1/"`
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B=`echo "$B" | sed "s/\(\([[0-9]]\{4\}\)\{m4_substr($2,2)\}\).*/\1/"`
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],
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[.+],[
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AC_WARNING(
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[invalid OP numeric parameter: $2])
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],[])
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# Pad zeros at end of numbers to make same length.
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ax_compare_version_tmp_A="$A`echo $B | sed 's/./0/g'`"
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B="$B`echo $A | sed 's/./0/g'`"
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A="$ax_compare_version_tmp_A"
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# Check for equality or inequality as necessary.
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m4_case(m4_tolower(m4_substr($2,0,2)),
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[eq],[
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test "x$A" = "x$B" && ax_compare_version=true
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],
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[ne],[
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test "x$A" != "x$B" && ax_compare_version=true
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],[
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AC_WARNING([invalid OP parameter: $2])
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])
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])
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AS_VAR_POPDEF([A])dnl
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AS_VAR_POPDEF([B])dnl
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dnl # Execute ACTION-IF-TRUE / ACTION-IF-FALSE.
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if test "$ax_compare_version" = "true" ; then
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m4_ifvaln([$4],[$4],[:])dnl
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m4_ifvaln([$5],[else $5])dnl
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fi
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]) dnl AX_COMPARE_VERSION

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