ax_compare_version.m4 6.4 KB

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  1. # ===========================================================================
  2. # http://www.gnu.org/software/autoconf-archive/ax_compare_version.html
  3. # ===========================================================================
  4. #
  5. # SYNOPSIS
  6. #
  7. # AX_COMPARE_VERSION(VERSION_A, OP, VERSION_B, [ACTION-IF-TRUE], [ACTION-IF-FALSE])
  8. #
  9. # DESCRIPTION
  10. #
  11. # This macro compares two version strings. Due to the various number of
  12. # minor-version numbers that can exist, and the fact that string
  13. # comparisons are not compatible with numeric comparisons, this is not
  14. # necessarily trivial to do in a autoconf script. This macro makes doing
  15. # these comparisons easy.
  16. #
  17. # The six basic comparisons are available, as well as checking equality
  18. # limited to a certain number of minor-version levels.
  19. #
  20. # The operator OP determines what type of comparison to do, and can be one
  21. # of:
  22. #
  23. # eq - equal (test A == B)
  24. # ne - not equal (test A != B)
  25. # le - less than or equal (test A <= B)
  26. # ge - greater than or equal (test A >= B)
  27. # lt - less than (test A < B)
  28. # gt - greater than (test A > B)
  29. #
  30. # Additionally, the eq and ne operator can have a number after it to limit
  31. # the test to that number of minor versions.
  32. #
  33. # eq0 - equal up to the length of the shorter version
  34. # ne0 - not equal up to the length of the shorter version
  35. # eqN - equal up to N sub-version levels
  36. # neN - not equal up to N sub-version levels
  37. #
  38. # When the condition is true, shell commands ACTION-IF-TRUE are run,
  39. # otherwise shell commands ACTION-IF-FALSE are run. The environment
  40. # variable 'ax_compare_version' is always set to either 'true' or 'false'
  41. # as well.
  42. #
  43. # Examples:
  44. #
  45. # AX_COMPARE_VERSION([3.15.7],[lt],[3.15.8])
  46. # AX_COMPARE_VERSION([3.15],[lt],[3.15.8])
  47. #
  48. # would both be true.
  49. #
  50. # AX_COMPARE_VERSION([3.15.7],[eq],[3.15.8])
  51. # AX_COMPARE_VERSION([3.15],[gt],[3.15.8])
  52. #
  53. # would both be false.
  54. #
  55. # AX_COMPARE_VERSION([3.15.7],[eq2],[3.15.8])
  56. #
  57. # would be true because it is only comparing two minor versions.
  58. #
  59. # AX_COMPARE_VERSION([3.15.7],[eq0],[3.15])
  60. #
  61. # would be true because it is only comparing the lesser number of minor
  62. # versions of the two values.
  63. #
  64. # Note: The characters that separate the version numbers do not matter. An
  65. # empty string is the same as version 0. OP is evaluated by autoconf, not
  66. # configure, so must be a string, not a variable.
  67. #
  68. # The author would like to acknowledge Guido Draheim whose advice about
  69. # the m4_case and m4_ifvaln functions make this macro only include the
  70. # portions necessary to perform the specific comparison specified by the
  71. # OP argument in the final configure script.
  72. #
  73. # LICENSE
  74. #
  75. # Copyright (c) 2008 Tim Toolan <toolan@ele.uri.edu>
  76. #
  77. # Copying and distribution of this file, with or without modification, are
  78. # permitted in any medium without royalty provided the copyright notice
  79. # and this notice are preserved. This file is offered as-is, without any
  80. # warranty.
  81. #serial 11
  82. dnl #########################################################################
  83. AC_DEFUN([AX_COMPARE_VERSION], [
  84. AC_REQUIRE([AC_PROG_AWK])
  85. # Used to indicate true or false condition
  86. ax_compare_version=false
  87. # Convert the two version strings to be compared into a format that
  88. # allows a simple string comparison. The end result is that a version
  89. # string of the form 1.12.5-r617 will be converted to the form
  90. # 0001001200050617. In other words, each number is zero padded to four
  91. # digits, and non digits are removed.
  92. AS_VAR_PUSHDEF([A],[ax_compare_version_A])
  93. A=`echo "$1" | sed -e 's/\([[0-9]]*\)/Z\1Z/g' \
  94. -e 's/Z\([[0-9]]\)Z/Z0\1Z/g' \
  95. -e 's/Z\([[0-9]][[0-9]]\)Z/Z0\1Z/g' \
  96. -e 's/Z\([[0-9]][[0-9]][[0-9]]\)Z/Z0\1Z/g' \
  97. -e 's/[[^0-9]]//g'`
  98. AS_VAR_PUSHDEF([B],[ax_compare_version_B])
  99. B=`echo "$3" | sed -e 's/\([[0-9]]*\)/Z\1Z/g' \
  100. -e 's/Z\([[0-9]]\)Z/Z0\1Z/g' \
  101. -e 's/Z\([[0-9]][[0-9]]\)Z/Z0\1Z/g' \
  102. -e 's/Z\([[0-9]][[0-9]][[0-9]]\)Z/Z0\1Z/g' \
  103. -e 's/[[^0-9]]//g'`
  104. dnl # In the case of le, ge, lt, and gt, the strings are sorted as necessary
  105. dnl # then the first line is used to determine if the condition is true.
  106. dnl # The sed right after the echo is to remove any indented white space.
  107. m4_case(m4_tolower($2),
  108. [lt],[
  109. ax_compare_version=`echo "x$A
  110. x$B" | sed 's/^ *//' | sort -r | sed "s/x${A}/false/;s/x${B}/true/;1q"`
  111. ],
  112. [gt],[
  113. ax_compare_version=`echo "x$A
  114. x$B" | sed 's/^ *//' | sort | sed "s/x${A}/false/;s/x${B}/true/;1q"`
  115. ],
  116. [le],[
  117. ax_compare_version=`echo "x$A
  118. x$B" | sed 's/^ *//' | sort | sed "s/x${A}/true/;s/x${B}/false/;1q"`
  119. ],
  120. [ge],[
  121. ax_compare_version=`echo "x$A
  122. x$B" | sed 's/^ *//' | sort -r | sed "s/x${A}/true/;s/x${B}/false/;1q"`
  123. ],[
  124. dnl Split the operator from the subversion count if present.
  125. m4_bmatch(m4_substr($2,2),
  126. [0],[
  127. # A count of zero means use the length of the shorter version.
  128. # Determine the number of characters in A and B.
  129. ax_compare_version_len_A=`echo "$A" | $AWK '{print(length)}'`
  130. ax_compare_version_len_B=`echo "$B" | $AWK '{print(length)}'`
  131. # Set A to no more than B's length and B to no more than A's length.
  132. A=`echo "$A" | sed "s/\(.\{$ax_compare_version_len_B\}\).*/\1/"`
  133. B=`echo "$B" | sed "s/\(.\{$ax_compare_version_len_A\}\).*/\1/"`
  134. ],
  135. [[0-9]+],[
  136. # A count greater than zero means use only that many subversions
  137. A=`echo "$A" | sed "s/\(\([[0-9]]\{4\}\)\{m4_substr($2,2)\}\).*/\1/"`
  138. B=`echo "$B" | sed "s/\(\([[0-9]]\{4\}\)\{m4_substr($2,2)\}\).*/\1/"`
  139. ],
  140. [.+],[
  141. AC_WARNING(
  142. [illegal OP numeric parameter: $2])
  143. ],[])
  144. # Pad zeros at end of numbers to make same length.
  145. ax_compare_version_tmp_A="$A`echo $B | sed 's/./0/g'`"
  146. B="$B`echo $A | sed 's/./0/g'`"
  147. A="$ax_compare_version_tmp_A"
  148. # Check for equality or inequality as necessary.
  149. m4_case(m4_tolower(m4_substr($2,0,2)),
  150. [eq],[
  151. test "x$A" = "x$B" && ax_compare_version=true
  152. ],
  153. [ne],[
  154. test "x$A" != "x$B" && ax_compare_version=true
  155. ],[
  156. AC_WARNING([illegal OP parameter: $2])
  157. ])
  158. ])
  159. AS_VAR_POPDEF([A])dnl
  160. AS_VAR_POPDEF([B])dnl
  161. dnl # Execute ACTION-IF-TRUE / ACTION-IF-FALSE.
  162. if test "$ax_compare_version" = "true" ; then
  163. m4_ifvaln([$4],[$4],[:])dnl
  164. m4_ifvaln([$5],[else $5])dnl
  165. fi
  166. ]) dnl AX_COMPARE_VERSION