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commit 164ba50fc74b980f77047080b2ae1ea099ae9b27
Author: Emery Hemingway <ehmry@posteo.net>
Date: Mon Sep 7 14:09:22 2020 +0200
Load libaries by absolute path on NixOS
If "nixbuild" is defined then choose dynamic runtime libraries by
searching $NIX_LDFLAGS at compile-time.
Fix #15194
diff --git a/lib/pure/dynlib.nim b/lib/pure/dynlib.nim
index f31ae94dd..debed9c07 100644
--- a/lib/pure/dynlib.nim
+++ b/lib/pure/dynlib.nim
@@ -56,6 +56,9 @@
import strutils
+when defined(nixbuild):
+ import os
+
type
LibHandle* = pointer ## a handle to a dynamically loaded library
@@ -95,6 +98,25 @@ proc libCandidates*(s: string, dest: var seq[string]) =
libCandidates(prefix & middle & suffix, dest)
else:
add(dest, s)
+ when defined(nixbuild):
+ # Nix doesn't have a global library directory so
+ # load libraries using an absolute path if one
+ # can be derived from NIX_LDFLAGS.
+ #
+ # During Nix/NixOS packaging the line "define:nixbuild"
+ # should be appended to the ../../config/nim.cfg file
+ # to enable this behavior by default.
+ #
+ var libDirs = split(getEnv("LD_LIBRARY_PATH"), ':')
+ for flag in split(getEnv("NIX_LDFLAGS")):
+ if flag.startsWith("-L"):
+ libDirs.add(flag[2..flag.high])
+ for lib in dest:
+ for dir in libDirs:
+ let abs = dir / lib
+ if existsFile(abs):
+ dest = @[abs]
+ return
proc loadLibPattern*(pattern: string, globalSymbols = false): LibHandle =
## loads a library with name matching `pattern`, similar to what `dlimport`
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