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https://github.com/NixOS/nixpkgs.git
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a341e62e78
omit windows build from dynamic linking patch to avoid cyclic import this makes it possible to cross-compile for windows using buildNimPackage
41 lines
1.3 KiB
Diff
41 lines
1.3 KiB
Diff
diff --git a/lib/pure/dynlib.nim b/lib/pure/dynlib.nim
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index f31ae94dd..debed9c07 100644
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--- a/lib/pure/dynlib.nim
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+++ b/lib/pure/dynlib.nim
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@@ -56,6 +56,9 @@
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import strutils
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+when defined(nixbuild) and not defined(windows):
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+ import os
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+
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type
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LibHandle* = pointer ## a handle to a dynamically loaded library
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@@ -95,6 +98,25 @@ proc libCandidates*(s: string, dest: var seq[string]) =
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libCandidates(prefix & middle & suffix, dest)
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else:
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add(dest, s)
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+ when defined(nixbuild) and not defined(windows):
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+ # Nix doesn't have a global library directory so
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+ # load libraries using an absolute path if one
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+ # can be derived from NIX_LDFLAGS.
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+ #
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+ # During Nix/NixOS packaging the line "define:nixbuild"
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+ # should be appended to the ../../config/nim.cfg file
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+ # to enable this behavior by default.
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+ #
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+ var libDirs = split(getEnv("LD_LIBRARY_PATH"), ':')
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+ for flag in split(replace(getEnv("NIX_LDFLAGS"), "\\ ", " ")):
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+ if flag.startsWith("-L"):
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+ libDirs.add(flag[2..flag.high])
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+ for lib in dest:
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+ for dir in libDirs:
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+ let abs = dir / lib
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+ if existsFile(abs):
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+ dest = @[abs]
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+ return
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proc loadLibPattern*(pattern: string, globalSymbols = false): LibHandle =
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## loads a library with name matching `pattern`, similar to what `dlimport`
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