[fpc-devel] Issue with Compiling FPC and MacOS Big Sur

[Michael Ring]

I recently upgraded to Big Sur on two devices and tried to compile trunk 
based on official 3.2.0 compiler freshly downloaded from sourceforge but 
compilation fails:

make all

....

/usr/local/bin/ppcx64 -Ur -Xs -O2 -n -Fux86_64 -Fusystems 
-Fu/Users/ring/devel/fpc/rtl/units/x86_64-darwin -Fix86_64 
-FEx86_64/bin/x86_64-darwin -FUx86_64/units/x86_64-darwin -dRELEASE    
-dx86_64 -dGDB -dBROWSERLOG -Fux86 -Fix86 pp.pas
ld: library not found for -lc
An error occurred while linking
pp.pas(280,36) Error: Error while linking
pp.pas(280,36) Fatal: There were 1 errors compiling module, stopping


Same thing happens when trying to compile from within fpcupdeluxe, 
Developer Tools are installed and up to date.

This may be related to a change in MacOS Big Sur, found a few comments 
on the possible issue:

https://github.com/dotnet/msbuild/issues/5454


there it says:


This will stop working in the next version of macOS:

    New in macOS Big Sur 11 beta, the system ships with a built-in
    dynamic linker cache of all system-provided libraries. As part of
    this change, copies of dynamic libraries are no longer present on
    the filesystem. Code that attempts to check for dynamic library
    presence by looking for a file at a path or enumerating a directory
    will fail. Instead, check for library presence by attempting to
    |dlopen()| the path, which will correctly check for the library in
    the cache. (62986286)


In Linker script -lc is last entry:

ring at MacBook-Pro-1 x86_64-darwin $ cat link.res
-arch
x86_64
-macosx_version_min
10.8
-L/usr/lib/
-L./x86_64/
-L./systems/
-L/Users/ring/devel/fpc/rtl/units/x86_64-darwin/
-L./x86/
-L/usr/local/bin/
-lc


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