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authorhttps://me.yahoo.com/a/g3Ccalpj0NhN566pHbUl6i9QF0QEkrhlfPM-#b1c14 <diana@web>2015-02-16 20:08:03 +0100
committerGNU Hurd web pages engine <web-hurd@gnu.org>2015-02-16 20:08:03 +0100
commit95878586ec7611791f4001a4ee17abf943fae3c1 (patch)
tree847cf658ab3c3208a296202194b16a6550b243cf /open_issues/glibc_madvise_vs_static_linking.mdwn
parent8063426bf7848411b0ef3626d57be8cb4826715e (diff)
rename open_issues.mdwn to service_solahart_jakarta_selatan__082122541663.mdwn
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@@ -1,48 +0,0 @@
-[[!meta copyright="Copyright © 2010, 2011, 2012, 2013 Free Software Foundation,
-Inc."]]
-
-[[!meta license="""[[!toggle id="license" text="GFDL 1.2+"]][[!toggleable
-id="license" text="Permission is granted to copy, distribute and/or modify this
-document under the terms of the GNU Free Documentation License, Version 1.2 or
-any later version published by the Free Software Foundation; with no Invariant
-Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license
-is included in the section entitled [[GNU Free Documentation
-License|/fdl]]."]]"""]]
-
-[[!tag open_issue_glibc]]
-
-[[!sourceware_PR 4822]].
-
- $ echo 'int main() {}' | gcc -o /dev/null -static -x c -
- /usr/lib/gcc/i486-gnu/4.4.5/../../../libcrt.a(malloc.o): In function `_int_free':
- (.text+0xdc3): warning: warning: madvise is not implemented and will always fail
-
-This is correct, but it does confuse GNU Autoconf, for example, which then
-thinks that static linking is not supported and sets a flag accordingly, which
-luckly no / not many packages use.
-
-*This call does not influence the semantics of the application (except in the
-case of MADV_DONTNEED), but may influence its performance. The kernel is free
-to ignore the advice.* (`man madvise`), so we may simply want to turn it into a
-no-op in glibc, avoiding the link-time warning.
-
-GCC c5db973fdab3db3e13db575e5650c0bcfd3630f4 (2011-10-17) makes use of this.
-As we now export the symbol (and `MADV_DONTNEED`, too), GCC will no longer
-`munmap` pages, but will keep them mapped for later re-use. This may increase
-memory usage. The discussion in [[!message-id
-"20120720162519.734e02eb@spoyarek"]] touches related topics.
-
-2011-07: This is what Samuel has [done for Debian
-glibc](http://anonscm.debian.org/viewvc/pkg-glibc/glibc-package/trunk/debian/patches/hurd-i386/local-madvise_warn.diff).
-
-
-# IRC, freenode, #hurd, 2012-02-16
-
- <tschwinge> youpi: With Roland's fix the situation will be that just using
- gcc -static doesn't emit the stub warning, but still will do so in case
- that the source code itself links in madvise. Is this acceptable for
- you/Debian/...?
- <youpi> packages with -Werror will still bug out
- <youpi> not that I consider -Werror to be a good idea, though :)
- <tschwinge> youpi: Indeed. Compiler warnings can be caused by all kinds of
- things. -Werror is good for development, but not for releases.