logos-messaging/nim-sds
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chore: fix iOS build

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otherwise iOS linker fails with
 ❌ Undefined symbols for architecture arm64
This commit is contained in:
Siddarth Kumar 2025-12-23 16:41:41 +04:00
parent 8d33a7f7da
commit fb8039c5a5
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GPG Key ID: 599D10112BF518DB
1 changed files with 30 additions and 13 deletions
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sds.nimble
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@ -1,6 +1,6 @@
mode = ScriptMode.Verbose
import strutils
import strutils, os
# Package
version = "0.1.0"
@ -114,35 +114,52 @@ proc buildMobileIOS(srcDir = ".", sdkPath = "") =
echo "Building iOS libsds library"
let outDir = "build"
let nimcacheDir = outDir & "/nimcache"
if not dirExists outDir:
mkDir outDir
if sdkPath.len == 0:
quit "Error: Xcode/iOS SDK not found"
# The output static library
let cFile = outDir & "/nimcache/@mlibsds.nim.c"
let oFile = outDir & "/libsds.o"
let aFile = outDir & "/libsds.a"
let aFileTmp = outDir & "/libsds_tmp.a"
let arch = getArch()
# 1) Generate C sources from Nim (no linking)
# Use unique symbol prefix to avoid conflicts with other Nim libraries
exec "nim c" &
" --nimcache:build/nimcache --os:ios --cpu:arm64" &
" --nimcache:" & nimcacheDir & " --os:ios --cpu:" & arch &
" --compileOnly:on" &
" --noMain --mm:refc" &
" --noMain --mm:orc" &
" --threads:on --opt:size --header" &
" --nimMainPrefix:libsds --skipParentCfg:on" &
" --cc:clang" &
" --out:" & cFile & " " &
srcDir & "/libsds.nim"
" -d:useMalloc" &
" " & srcDir & "/libsds.nim"
exec "clang -arch arm64" &
" -isysroot " & sdkPath &
# 2) Compile all generated C files to object files with hidden visibility
# This prevents symbol conflicts with other Nim libraries (e.g., libnim_status_client)
let clangFlags = "-arch " & arch & " -isysroot " & sdkPath &
" -I./vendor/nimbus-build-system/vendor/Nim/lib/" &
" -fembed-bitcode -c " & cFile &
" -o " & oFile
" -fembed-bitcode -miphoneos-version-min=16.0 -O2" &
" -fvisibility=hidden"
exec "ar rcs " & aFile & " " & oFile
var objectFiles: seq[string] = @[]
for cFile in listFiles(nimcacheDir):
if cFile.endsWith(".c"):
let oFile = cFile.changeFileExt("o")
exec "clang " & clangFlags & " -c " & cFile & " -o " & oFile
objectFiles.add(oFile)
# 3) Create static library from all object files
exec "ar rcs " & aFileTmp & " " & objectFiles.join(" ")
# 4) Use libtool to localize all non-public symbols
# Keep only Sds* functions as global, hide everything else to prevent conflicts
# with nim runtime symbols from libnim_status_client
let keepSymbols = "_Sds*:_libsdsNimMain:_libsdsDatInit*:_libsdsInit*:_NimMainModule__libsds*"
exec "xcrun libtool -static -o " & aFile & " " & aFileTmp &
" -exported_symbols_list /dev/stdin <<< '" & keepSymbols & "' 2>/dev/null || cp " & aFileTmp & " " & aFile
echo "✔ iOS library created: " & aFile