mirror of https://github.com/GNOME/gimp.git
66 lines
2.8 KiB
Plaintext
66 lines
2.8 KiB
Plaintext
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configure.ac libtool settings
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=============================
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This is a brief description of how the various version variables at the
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top of configure.ac are to be set, including gimp_interface_age and
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gimp_binary_age.
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See the arithmetic under the "libtool versioning" comment heading in
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configure.ac as a reference.
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See https://www.gnu.org/software/libtool/manual/html_node/Libtool-versioning.html
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for definitions of libtool "current", "revision" and "age" numbers as
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used below.
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When making a release
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---------------------
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(1) When making releases on the stable branch, set:
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gimp_micro_version += 1;
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gimp_interface_age += 1;
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If gimp_binary_age is defined as a constant, set gimp_binary_age += 1;
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else if gimp_binary_age is defined as an m4_eval(), leave it as it is.
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The default gimp_binary_age m4_eval() expression auto-increments
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itself.
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(2) NEVER increment gimp_interface_age and gimp_binary_age by more than
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1 at any time for whatever reason, or you will have to wear a brown
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paper bag on your head to hide your face for the rest of your life. If
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you increment gimp_interface_age by more than 1, then the libtool
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"current" number is decremented which could result in incompatible
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library interface with existing bin programs.
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(3) If any functions have been added, set gimp_interface_age=0. This
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will cause the "current" and "age" part of libtool version to bump
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upwards, increasing the interface number the library implements while
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keeping the minimum interface number supported the same as before
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(i.e., backwards compatible ABI).
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Example: In GIMP 2.8.10, with gimp_minor_version=8,
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gimp_micro_version=10 and gimp_interface_age=10 (incremented by 1
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for every micro release), current=800 and age=800, which means that
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the libraries support interface numbers 0 through 800, and the
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interface DID NOT change at all between GIMP 2.8.0 to GIMP 2.8.10.
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Example: In GIMP 2.8.12, with gimp_minor_version=8,
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gimp_micro_version=12 and gimp_interface_age=0, current=812 and
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age=812, which means that the libraries support interface numbers 0
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through 812, and the ABI interface DID change in backwards
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compatible manner at the time gimp_interface_age was set to 0.
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(4) If backwards compatibility was broken, set gimp_binary_age=0 and
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gimp_interface_age=0. This will cause "age" part of libtool version to
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be 0, increasing the minimum interface supported to "current" part of
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libtool version, and making ABI backwards incompatible (the linker
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will not be able to use these libraries with programs compiled to work
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against older libraries.
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Example: In GIMP 2.8.14, with gimp_minor_version=8,
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gimp_micro_version=14, gimp_binary_age=0 and gimp_interface_age=0,
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current=814 and age=0, which means that the libraries support
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interface number 814 only, which tells libtool the ABI interface
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changed in backwards incompatible manner at the time
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gimp_binary_age was set to 0.
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