Hi, I have an issue with linker as well. I am building a IBM MQ driver using Erlang driver. It is building ok in Linux x64/Arm64 but doesn't build in macOS Arm64. Can you help please. e072513@VL-K4YR0QX62K c_src % gcc -I /opt/homebrew/Cellar/erlang@26/26.2.5/lib/erlang/usr/include -I /opt/mqm/inc -shared -fPIC -L /opt/mqm/lib64 -L /opt/homebrew/Cellar/erlang@26/26.2.5/lib/erlang/lib/erl_interface-5.5.1/lib -lei -lmqic_r -lpthread mq_series_drv.c -o mq_series_drv.so -v Apple clang version 16.0.0 (clang-1600.0.26.3) Target: arm64-apple-darwin23.6.0 Thread model: posix InstalledDir: /Library/Developer/CommandLineTools/usr/bin "/Library/Developer/CommandLineTools/usr/bin/clang" -cc1 -triple arm64-apple-macosx14.0.0 -Wundef-prefix=TARGET_OS_ -Wdeprecated-objc-isa-usage -Werror=deprecated-objc-isa-usage -Werror=implicit-function-declaration -emit-obj -mrelax-all -dumpdir mq_series_drv.so- -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name mq_series_drv.c -mrelocation-model pic -pic-level 2 -mframe-pointer=non-leaf -fno-strict-return -ffp-contract=on -fno-rounding-math -funwind-tables=1 -fobjc-msgsend-selector-stubs -target-sdk-version=15.0 -fvisibility-inlines-hidden-static-local-var -fno-modulemap-allow-subdirectory-search -target-cpu apple-m1 -target-feature +v8.5a -target-feature +aes -target-feature +crc -target-feature +dotprod -target-feature +fp-armv8 -target-feature +fp16fml -target-feature +lse -target-feature +ras -target-feature +rcpc -target-feature +rdm -target-feature +sha2 -target-feature +sha3 -target-feature +neon -target-feature +zcm -target-feature +zcz -target-feature +fullfp16 -target-abi darwinpcs -debugger-tuning=lldb -target-linker-version 1115.7.3 -v -fcoverage-compilation-dir=/Users/e072513/ips-tch-switch/_checkouts/mq_series/c_src -resource-dir /Library/Developer/CommandLineTools/usr/lib/clang/16 -isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk -I /opt/homebrew/Cellar/erlang@26/26.2.5/lib/erlang/usr/include -I /opt/mqm/inc -I/usr/local/include -internal-isystem /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/local/include -internal-isystem /Library/Developer/CommandLineTools/usr/lib/clang/16/include -internal-externc-isystem /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include -internal-externc-isystem /Library/Developer/CommandLineTools/usr/include -Wno-reorder-init-list -Wno-implicit-int-float-conversion -Wno-c99-designator -Wno-final-dtor-non-final-class -Wno-extra-semi-stmt -Wno-misleading-indentation -Wno-quoted-include-in-framework-header -Wno-implicit-fallthrough -Wno-enum-enum-conversion -Wno-enum-float-conversion -Wno-elaborated-enum-base -Wno-reserved-identifier -Wno-gnu-folding-constant -fdebug-compilation-dir=/Users/e072513/ips-tch-switch/_checkouts/mq_series/c_src -ferror-limit 19 -stack-protector 1 -fstack-check -mdarwin-stkchk-strong-link -fblocks -fencode-extended-block-signature -fregister-global-dtors-with-atexit -fgnuc-version=4.2.1 -fmax-type-align=16 -fcommon -fcolor-diagnostics -clang-vendor-feature=+disableNonDependentMemberExprInCurrentInstantiation -fno-odr-hash-protocols -clang-vendor-feature=+enableAggressiveVLAFolding -clang-vendor-feature=+revert09abecef7bbf -clang-vendor-feature=+thisNoAlignAttr -clang-vendor-feature=+thisNoNullAttr -clang-vendor-feature=+disableAtImportPrivateFrameworkInImplementationError -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /var/folders/zw/xt5wvkzj43v_p458qgx16bxw0000gn/T/mq_series_drv-d90068.o -x c mq_series_drv.c clang -cc1 version 16.0.0 (clang-1600.0.26.3) default target arm64-apple-darwin23.6.0 ignoring nonexistent directory "/usr/local/include" ignoring nonexistent directory "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/local/include" ignoring nonexistent directory "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/Library/Frameworks" #include "..." search starts here: #include <...> search starts here: /opt/homebrew/Cellar/erlang@26/26.2.5/lib/erlang/usr/include /opt/mqm/inc /Library/Developer/CommandLineTools/usr/lib/clang/16/include /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include /Library/Developer/CommandLineTools/usr/include /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Frameworks (framework directory) End of search list. "/Library/Developer/CommandLineTools/usr/bin/ld" -demangle -lto_library /Library/Developer/CommandLineTools/usr/lib/libLTO.dylib -no_deduplicate -dynamic -dylib -arch arm64 -platform_version macos 14.0.0 15.0 -syslibroot /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk -mllvm -enable-linkonceodr-outlining -o mq_series_drv.so -L/opt/mqm/lib64 -L/opt/homebrew/Cellar/erlang@26/26.2.5/lib/erlang/lib/erl_interface-5.5.1/lib -L/usr/local/lib -lei -lmqic_r -lpthread /var/folders/zw/xt5wvkzj43v_p458qgx16bxw0000gn/T/mq_series_drv-d90068.o -lSystem /Library/Developer/CommandLineTools/usr/lib/clang/16/lib/darwin/libclang_rt.osx.a Undefined symbols for architecture arm64: "_driver_alloc", referenced from: _mq_drv_start in mq_series_drv-d90068.o _do_connect in mq_series_drv-d90068.o _do_put in mq_series_drv-d90068.o _do_get in mq_series_drv-d90068.o "_driver_async", referenced from: _do_connect in mq_series_drv-d90068.o _do_put in mq_series_drv-d90068.o _do_get in mq_series_drv-d90068.o "_driver_free", referenced from: _mq_drv_stop in mq_series_drv-d90068.o _ready_async in mq_series_drv-d90068.o _do_free in mq_series_drv-d90068.o "_driver_output", referenced from: _ready_async in mq_series_drv-d90068.o _error_bad_arg in mq_series_drv-d90068.o _return_error in mq_series_drv-d90068.o ld: symbol(s) not found for architecture arm64 clang: error: linker command failed with exit code 1 (use -v to see invocation)