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01/02: website: ld-so-cache: Explain 'make-dynamic-linker-cache' phase.
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From: |
Ludovic Courtès |
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Subject: |
01/02: website: ld-so-cache: Explain 'make-dynamic-linker-cache' phase. |
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Date: |
Mon, 2 Aug 2021 08:43:38 -0400 (EDT) |
civodul pushed a commit to branch master
in repository guix-artwork.
commit 8aa52ed89a4ecb34a985e93df54b2d344fa8b1e1
Author: Ludovic Courtès <ludo@gnu.org>
AuthorDate: Mon Aug 2 14:13:04 2021 +0200
website: ld-so-cache: Explain 'make-dynamic-linker-cache' phase.
* website/drafts/ld-so-cache.md: Explain 'make-dynamic-linker-cache'
procedure.
---
website/drafts/ld-so-cache.md | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/website/drafts/ld-so-cache.md b/website/drafts/ld-so-cache.md
index 4b58f00..efb4b26 100644
--- a/website/drafts/ld-so-cache.md
+++ b/website/drafts/ld-so-cache.md
@@ -211,6 +211,12 @@ tracker](https://issues.guix.gnu.org/44899); you can see
[the glibc
patch](https://git.savannah.gnu.org/cgit/guix.git/tree/gnu/packages/patches/glibc-dl-cache.patch?h=core-updates&id=0236013cd0fc86ff4a042885c735e3f36a7f5c25)
and the new [`make-dynamic-linker-cache` build
phase](https://git.savannah.gnu.org/cgit/guix.git/tree/guix/build/gnu-build-system.scm?h=core-updates&id=0236013cd0fc86ff4a042885c735e3f36a7f5c25#n735).
+In short, the `make-dynamic-linker-cache` phase computes the set of
+direct and indirect dependencies of an ELF file using the
+[`file-needed/recursive`](https://git.savannah.gnu.org/cgit/guix.git/tree/guix/build/gremlin.scm?id=0236013cd0fc86ff4a042885c735e3f36a7f5c25#n265)
+procedure and derives from that the library search path, creates a
+temporary `ld.so.conf` file containing this search path for use by
+`ldconfig`, and finally runs `ldconfig` to actually build the cache.
How does this play out in practice? Let’s try an `emacs` build that
uses this new loader cache: