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Have done your advice with the template for static library. It works !I created 2 librarys, because I had the cources. One was for simulator and the other for device.Then I put both together by lipo command and I use it for my App.Now it is running on simulator and device as before.Previous library had a size of 250 KB, but the new generated library 1.4 MB.Both librarys are architecture: x86_64, arm64

In Your answer before, You adviced me to create the library through an xcode project or a Swift package.. I give you first here the info, how I have done it actuallyTo create the library , I did the following steps:I have some -.c files that have to be compiled and linked to get the library.for all that I use the Terminal :1. I gave the -.c files in a folder /usr/local/f2c/libf2c2. I modified the makefile on CC and CFLAGS to adjust for the Xcode settingshere some extracts of the makefile:.SUFFIXES: .c .oCC = "/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/cc"SHELL = /bin/shCFLAGS = -arch arm64 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS13.4.sdk# compile, then strip unnecessary symbols.c.o: $(CC) -c -DSkip_f2c_Undefs $(CFLAGS) $*.c. # HERE the COMPILING starts ld -r -x -o $*.*** $*.o mv $*.*** $*.o.....all: f2c.h signal1.h sysdep1.h libf2c.a........libf2c.a: $(OFILES) ar r libf2c.a $? -ranlib libf2c.a3. I call ' make ' in the terminal and then the sript is runningResult is a library called : libf2c.ato check the library by : lipo -info libf2c.athis library is architecture X86_64 and arm64, same as before, when I created it with previous MAC and Xcode versionsBut even the library is now created by MAC OS 10.15.4 and Xcode 11.4, the error message is the same:"Building for ios Simultor but the linked library 'libf2c.a' was build for mac OS + iosIf you want, then I can ship You all the c-files and the makefile, to that you can reproduce the creation of the library.What shold be the solution to create a library running in Xcode 11.4 , both in Simulator and on device, same as before ?You adviced to do it in a xcode project, but How can I do all the works inside a xcode project or from a swift package, when I have native C-code ? In my Xcode project, i just inserted the library and it was working. But no more in Xcode 11.4

Thanks for the info.But I did not get the library running by changes in Xcode settings. So, I tried to recompile it in xcode 11.4The library is a static C-Library. . So, c-code has to be compiled and linked. I have done it before and library was running in Xcode 11.3in the MAKE file I adjusted:CC = /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ccCFLAGS = -arch arm64 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS13.4.sdkWhen I run it, I receive a new library. This library is arch: X86_64 and arm64But even with this new created library in my project I get the same mistake:"Building for ios simulator , but the linked library was build for macOS + iosThen I changed the CFLAGS to the iphone simulator platform:CFLAGS = -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator13.4.sdkProblem is that I do not know what is the arch for the Simulator ?Can You help me to adjust the CFLAGS settings or other adjustments in the MAKE File to receive a library accepted by the simulator ?Thanks, Robert

Have done your advice, but when I exclude the library and start the program, I get a lot of linking failure messages from that library. It seems that the ios Simulator needs the static library. Everything was fine in Xcode 11.3 and no more in Xcode 11.4