On Wed, Jan 25, 2023 at 12:46 AM Ben Greear via curl-library <curl-library@lists.haxx.se> wrote: > > So, I'm well off in the weeds here. > > Trying to compile lib-cares on macos (using clang), for ARM target on x86-64 > macos machine. I'm able to see the > c files compiled for the right target, but the linker part is not passing the > -target > flag it seems. > > [...] > Here is how I am doing the configure step: > > (cd c-ares.ct && \ > export CFLAGS="-mmacosx-version-min=11.0 -target > arm64-apple-macos11"; \ > export LDFLAGS="-mmacosx-version-min=11.0 -target > arm64-apple-macos11"; \ > ./configure --enable-warnings --host=aarch64-apple-darwin && \ > perl -i.bkp -pe 's/^archive_cmds.*\K-install_name/-target > arm64-apple-macos11 -install_name/' libtool)
I think there may be two problems. First, I think you should set a sysroot. Second, I think you should set CPPFLAGS. I would also set CXXFLAGS for completeness, but I don't believe it's a problem in this instance. CXXFLAGS will just be ignored if it is not used. CPPFLAGS will include --isysroot . LDFLAGS will include --sysroot. Here's what things look like when I set a cross-compile environment for an iPad from an old Intel MacBook using an old XCode: $ source ./setenv-ios.sh IOS_SDK=iPhone IOS_CPU=arm64 Configuring for iPhoneOS (arm64) XCODE_TOOLCHAIN: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ IOS_SDK: iPhoneOS IOS_CPU: arm64 IOS_CFLAGS: -arch arm64 -miphoneos-version-min=6 -fno-common IOS_CXXFLAGS: -arch arm64 -miphoneos-version-min=6 -stdlib=libc++ -fno-common IOS_SYSROOT: /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS8.2.sdk $ echo $CPPFLAGS -DNDEBUG -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS8.2.sdk $ echo $CFLAGS -Wall -g2 -O3 -fPIC -arch arm64 -miphoneos-version-min=6 -fno-common $ echo $CXXFLAGS -Wall -g2 -O3 -fPIC -arch arm64 -miphoneos-version-min=6 -stdlib=libc++ -fno-common $ echo $LDFLAGS --sysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS8.2.sdk You can find the setenv-ios.sh script here: https://github.com/weidai11/cryptopp/blob/master/TestScripts/setenv-ios.sh . It will work with any well written makefile or Automake project. "Well written" means the user's flags are honored, and not stomped on by the makefile author. I've been using setenv-ios.sh for 10 or 15 years now. It's a little outdated, but it still works fine. Finally, when you are cross-compiling, you have to set both --host and --build for configure due to an old bug in Autoconf. Also see https://www.gnu.org/software/autoconf/manual/autoconf-2.69/html_node/Hosts-and-Cross_002dCompilation.html . Jeff -- Unsubscribe: https://lists.haxx.se/listinfo/curl-library Etiquette: https://curl.se/mail/etiquette.html
