Changes between Version 4 and Version 5 of rust

Timestamp:

03/04/2020 10:49:41 PM (4 years ago)

Author:

ken@…

Comment:

Rustc 1.41.1 (can be used for latest firefox) needs to be built with its shipped llvm, not 9.0.1.

rust

@@ -9 +9 @@
 Otherwise, you may find that rustc burns CPU (i.e. hangs) when building firefox-68 (seen on an i3 SandyBridge with BLFS-8.3 (clang 6.0.1).
 
+== rustc-1.41.1 (only relevant if using firefox newer than the 68-ESR series) ==
+
+There were problems with rustc-1.41.0, one of which involved errors in borrow checking - it should not be used. There was also a problem which can apparently lead to a segmentation fault. These are fixed in 1.41.1, but the fix for one of these (issue 69225) required them to backport an LLVM change to their shipped version.
+
+If you build rustc-1.41.1 with system llvm-9.0.1 the new test will fail:
+{{{
+    [ui] ui/issues/issue-69225-SCEVAddExpr-wrap-flag.rs
+}}}
+
+This is bad, the workaround is to use the shipped llvm, like we have had to do in the past.
+
+The changes in config.toml to use shipped llvm are:
+
+1. Comment out link-shared = true
+2. Remove the [target-...] sections with their pointers to llvm-config.
+
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