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Hit people over the head so they realize run-time errors of the form

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/libexec/ld-elf.so.1: Undefined symbol "_ZNSs20_S_empty_rep_storageE"
does mean they are hitting the GCC 3.4 ABI change issue.
This commit is contained in:
David E. O'Brien 2004-08-21 19:44:43 +00:00
parent b99e61353f
commit d0e54ab4ce
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=134129
1 changed files with 8 additions and 5 deletions
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@ -69,11 +69,14 @@ NOTE TO PEOPLE WHO THINK THAT FreeBSD 5.x IS SLOW:
compiler upgrade, there are several issues to be aware of. GCC 3.4.x
has broken C++ ABI compatibility with previous releases yet again
and users will have to rebuild all their C++ programs with the new
compiler. A new unit-at-a-time optimization mode, which is default
in this compiler release, is more aggressive in removing unused
static symbols. This is the likely cause of 'make buildworld'
breakages with non-default CFLAGS where optimization level is set
to -O2 or higher.
compiler. If you are getting run-time error such as
/libexec/ld-elf.so.1: Undefined symbol "_ZNSs20_S_empty_rep_storageE"
This entry does apply to you.
A new unit-at-a-time optimization mode, which is default in this
compiler release, is more aggressive in removing unused static
symbols. This is the likely cause of 'make buildworld' breakages
with non-default CFLAGS where optimization level is set to -O2 or higher.
With the upgrade of the system compiler, the kernel has been upgraded
to match the new system compiler. This makes it impossible to build