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This patch removes the --enable-oldest-abi configure option, which has
long been bitrotten (as reported in bug 6652). The principle of
removing this option was agreed in the thread starting at
<https://sourceware.org/ml/libc-alpha/2013-07/msg00174.html>.
Tested for x86_64 and x86 that the installed shared libraries other
than libc.so are unchanged by this patch and that libc.so disassembly
and symbol versions are unchanged (debug info changes because of
changed line numbers in csu/version.c).
[BZ #6652]
* Makeconfig (soversions-default-setname): Remove variable.
($(common-objpfx)soversions.i): Don't pass default_setname to
soversions.awk.
* Makerules ($(common-objpfx)abi-versions.h): Don't pass
oldest_abi to abi-versions.awk.
* config.h.in (GLIBC_OLDEST_ABI): Remove macro undefine.
* config.make.in (oldest-abi): Remove variable.
* configure.ac (--enable-oldest-abi): Remove configure option.
* configure: Regenerated.
* csu/version.c (banner) [GLIBC_OLDEST_ABI]: Remove conditional
text.
* scripts/abi-versions.awk: Do not handle oldest_abi variable.
* scripts/soversions.awk: Do not handle default_setname variable.
* sysdeps/mach/hurd/configure.ac: Do not handle oldest_abi
variable.
* sysdeps/mach/hurd/configure: Regenerated.
* sysdeps/unix/sysv/linux/configure.ac: Do not handle oldest_abi
variable.
* sysdeps/unix/sysv/linux/configure: Regenerated.
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* scripts/abi-versions.awk: If the version specified by
--enable-oldest-abi is older than the first version for this
architecture, use the default version.
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* include/shlib-compat.h (SHLIB_COMPAT): Take a third argument,
indicating the first version set to obsolete the conditionalized code.
* scripts/abi-versions.awk: For subsumed versions, make ABI_* defn's
rhs be the ABI_* macro for the subsuming version. Assign increasing
integer values to the ABI_* macros for supported versions.
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supported version for libc 0.2.90.libio to GLIBC_2.2.
* Makeconfig (soversions.mk): Grok new third column in shlib-versions,
and use it to emit new variable `map-firstversions'.
* scripts/firstversions.awk: New file.
* Makerules (Versions.all): Use scripts/firstversions.awk and
the $(map-firstversions) value to generate a modified versions list
that includes renames in "A = B" syntax for each version set earlier
than the "earliest symbol version" named in shlib-versions.
* scripts/versions.awk: Recognize "A = B" lines in the input to mean
rename version set A to B in the output to the intermediate file.
* scripts/abi-versions.awk: New file.
* Makerules (abi-versions.h): New target, generated by that script.
[$(versioning) = yes] (before-compile): Prepend abi-versions.h.
* include/shlib-compat.h: New file, uses that generated header.
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