fix: restore macOS compile flags

script/prepare-llvm-linux.sh

@@ -31,6 +31,7 @@ $CP llvm/lib/lib{c++,c++abi,unwind}.* $GMP/lib/libgmp.a stage1/lib/
 $CP $GLIBC/lib/libc_nonshared.a stage1/lib/glibc
 for f in $GLIBC/lib/lib{c,dl,m,rt,pthread}-*; do b=$(basename $f); cp $f stage1/lib/glibc/${b%-*}.so; done
 OPTIONS=()
+echo -n " -DLEAN_STANDALONE=ON"
 echo -n " -DCMAKE_C_COMPILER=$PWD/stage1/bin/clang -DCMAKE_CXX_COMPILER=$PWD/llvm/bin/clang++ -DLEAN_CXX_STDLIB='-Wl,-Bstatic -lc++ -lc++abi -Wl,-Bdynamic'"
 # allow C++ code to include /usr since it needs quite a few more headers
 echo -n " -DLEAN_EXTRA_CXX_FLAGS='--sysroot $PWD/llvm -I/usr/include -I/usr/include/x86_64-linux-gnu'"

script/prepare-llvm-macos.sh

@@ -28,6 +28,7 @@ gcp ${GMP:-/usr/local/opt/gmp}/lib/libgmp.a stage1/lib/
 cp $SDK/usr/lib/libSystem.tbd stage1/lib/libc
 # use for linking, use system libs for running
 gcp llvm/lib/lib{c++,c++abi,unwind}.dylib stage1/lib/libc
+echo -n " -DLEAN_STANDALONE=ON"
 echo -n " -DCMAKE_C_COMPILER=$PWD/stage1/bin/clang -DCMAKE_CXX_COMPILER=$PWD/llvm/bin/clang++"
 # allow C++ code to include /usr since it needs quite a few more headers
 # need no-macro-redefined for weird clang stdint.h

script/prepare-llvm-mingw.sh

@@ -30,6 +30,7 @@ cp /clang64/x86_64-w64-mingw32/lib/{crtbegin,crtend,crt2,dllcrt2}.o stage1/lib/
 (cd llvm; cp --parents lib/clang/*/lib/*/libclang_rt.builtins* ../stage1)
 # further dependencies
 cp /clang64/x86_64-w64-mingw32/lib/lib{m,bcrypt,mingw32,moldname,mingwex,msvcrt,pthread,advapi32,shell32,user32,kernel32,ucrtbase}.* /clang64/lib/libgmp.a llvm/lib/lib{c++,c++abi,unwind}.a stage1/lib/
+echo -n " -DLEAN_STANDALONE=ON"
 echo -n " -DCMAKE_C_COMPILER=$PWD/stage1/bin/clang.exe -DCMAKE_CXX_COMPILER=$PWD/llvm/bin/clang++.exe -DLEAN_CXX_STDLIB='-lc++ -lc++abi'"
 echo -n " -DSTAGE0_CMAKE_C_COMPILER=clang -DSTAGE0_CMAKE_CXX_COMPILER=clang++"
 # allow C++ code to include /usr since it needs quite a few more headers

src/CMakeLists.txt

@@ -399,6 +399,12 @@ string(TOUPPER "${CMAKE_BUILD_TYPE}" uppercase_CMAKE_BUILD_TYPE)
 # These are used in lean.mk (and libleanrt) and passed through by stdlib.make
 # They are not embedded into `leanc` since they are build profile/machine specific
 set(LEANC_OPTS "${LEANC_OPTS} ${CMAKE_CXX_FLAGS_${uppercase_CMAKE_BUILD_TYPE}}")
+if(CMAKE_OSX_SYSROOT AND NOT LEAN_STANDALONE)
+  string(APPEND LEANC_OPTS " ${CMAKE_CXX_SYSROOT_FLAG}${CMAKE_OSX_SYSROOT}")
+endif()
+if(CMAKE_OSX_DEPLOYMENT_TARGET)
+  string(APPEND LEANC_OPTS " ${CMAKE_CXX_OSX_DEPLOYMENT_TARGET_FLAG}${CMAKE_OSX_DEPLOYMENT_TARGET}")
+endif()
 
 if(${STAGE} GREATER 1)
   # reuse C++ parts, which don't change