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authorMatthias Maier <tamiko@43-1.org>2018-06-23 12:50:46 -0500
committerMatthias Maier <tamiko@43-1.org>2018-06-23 13:50:52 -0500
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tree8be1febd6def051b8baa2d42de3a880d87ee041e
parentNew item: Python 3.6 to become the default target (diff)
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2018-06-23-mpfr-4-update: Add news item
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+Title: dev-libs/mpfr 4 upgrade
+Author: Matthias Maier <tamiko@gentoo.org>
+Posted: 2018-06-23
+Revision: 1
+News-Item-Format: 2.0
+Display-If-Installed: <dev-libs/mpfr-4
+
+dev-libs/mpfr-4 introduced an ABI and soname change that has the potential
+of breaking the compiler toolchain. In order to minimize potential problems
+it is strongly recommended to rebuild mpc and gcc immediately after mpfr.
+You can do this by running
+
+ emerge --ask --oneshot ">=dev-libs/mpfr-4" dev-libs/mpc sys-devel/gcc
+
+Detailed explanation:
+
+libmpfr.so is used by libmpc.so (provided by dev-libs/mpc), as well as by
+internal executables (e.g. cc1, cc1plus) of sys-devel/gcc. Appropriate
+subslots in mpfr and slot-operators in dependencies in mpc and gcc will
+cause a rebuild of mpc and gcc after an upgrade of mpfr.
+
+However, after mpfr-4 is installed and mpc rebuiltd, but *before* gcc is
+rebuilt, gcc will be in an inconsistent state wherein symbols from
+incorrect library versions of mpfr might get used. This can result in
+segfaults and internal compiler errors. It is therefore important to
+rebuild gcc immmediately after mpc.
+
+A detailed update guide with troubleshoot section can be found on the wiki:
+https://wiki.gentoo.org/wiki/Mpfr4-update-guide