Error installing 'real' package on MacOS

Installing
1

I’m getting an error trying to install the ‘real’ package on MacOS (Connecting SWI-Prolog 8.1.1 to R).
The error is in configure:2937: error: C compiler cannot create executables

I’m running as sudo.

Any advice is appreciated.

The relevant part from config. is:
configure:2826: checking for C compiler version
configure:2835: swipl-ld --version >&5
clang: The build tool has reset ENV; --env=std required.
/usr/local/Homebrew/Library/Homebrew/shims/mac/super/clang returned code 256
*** swipl-ld exit status 1
configure:2846: ? = 1 configure:2835: swipl-ld -v >&5 clang: The build tool has reset ENV; --env=std required. /usr/local/Homebrew/Library/Homebrew/shims/mac/super/clang returned code 256 *** swipl-ld exit status 1 configure:2846: ? = 1
configure:2835: swipl-ld -V >&5
clang: The build tool has reset ENV; --env=std required.
/usr/local/Homebrew/Library/Homebrew/shims/mac/super/clang returned code 256
*** swipl-ld exit status 1
configure:2846: ? = 1 configure:2835: swipl-ld -qversion >&5 clang: The build tool has reset ENV; --env=std required. /usr/local/Homebrew/Library/Homebrew/shims/mac/super/clang returned code 256 *** swipl-ld exit status 1 configure:2846: ? = 1
configure:2866: checking whether the C compiler works
configure:2888: swipl-ld -fPIC -pthread -I"/usr/local/Cellar/swipl/8.1.1/lib/swipl/include" conftest.c >&5
clang: The build tool has reset ENV; --env=std required.
/usr/local/Homebrew/Library/Homebrew/shims/mac/super/clang returned code 256
*** swipl-ld exit status 1
configure:2892: $? = 1
configure:2930: result: no
configure: failed program was:
| /* confdefs.h /
| #define PACKAGE_NAME “”
| #define PACKAGE_TARNAME “”
| #define PACKAGE_VERSION “”
| #define PACKAGE_STRING “”
| #define PACKAGE_BUGREPORT “”
| #define PACKAGE_URL “”
| / end confdefs.h. */
|
| int
| main ()
| {
|
| ;
| return 0;
| }
configure:2935: error: in `/usr/local/Cellar/swipl/8.1.1/lib/swipl/pack/real’:
configure:2937: error: C compiler cannot create executables

2

Seems Brew redefines the environment and/or clang. It is a little hard to debug without a Mac, but clang: The build tool has reset ENV; --env=std required gives a lot of hints.

The Prolog pack system provides the prolog_pack:environment/2 hook to extend the build environment. See http://www.swi-prolog.org/pldoc/doc_for?object=prolog_pack%3Aenvironment/2

If you figure out what needs to be passed, please add it to this topic or create a pull request to update the default rules in library(prolog_pack).

3

A different error also occurs on macOS 10.14.3 when using a manually installed swipl-devel git version:

?- pack_install(real).
...
% gcc -fPIC -pthread -I"/Users/pmoura/lib/swipl/include" -std=c99 -I/Library/Frameworks/R.framework/Resources/include -fopenmp -L/usr/local/lib -F/Library/Frameworks/R.framework/.. -framework R -lpcre -llzma -lbz2 -lz -licucore -lm -liconv -L/opt/local/lib -llzma -c -o c/real.o c/real.c
Warning: clang: warning: -framework R: 'linker' input unused [-Wunused-command-line-argument]
Warning: clang: warning: -lpcre: 'linker' input unused [-Wunused-command-line-argument]
Warning: clang: warning: -llzma: 'linker' input unused [-Wunused-command-line-argument]
Warning: clang: warning: -lbz2: 'linker' input unused [-Wunused-command-line-argument]
Warning: clang: warning: -lz: 'linker' input unused [-Wunused-command-line-argument]
Warning: clang: warning: -licucore: 'linker' input unused [-Wunused-command-line-argument]
Warning: clang: warning: -lm: 'linker' input unused [-Wunused-command-line-argument]
Warning: clang: warning: -liconv: 'linker' input unused [-Wunused-command-line-argument]
Warning: clang: warning: -llzma: 'linker' input unused [-Wunused-command-line-argument]
ERROR: clang: error: unsupported option '-fopenmp'
% make: *** [c/real.o] Error 1
4

The error installing the real package also seems to expose a bug in the handling of packs. After the failure above, I get:

$ swipl
Warning: Package real: no binary for architecture x86_64-darwin
Welcome to SWI-Prolog (threaded, 64 bits, version 8.1.1-18-g6b8c96f10)
SWI-Prolog comes with ABSOLUTELY NO WARRANTY. This is free software.
Please run ?- license. for legal details.

For online help and background, visit http://www.swi-prolog.org
For built-in help, use ?- help(Topic). or ?- apropos(Word).

?- pack_remove(real).
ERROR: pack `real' does not exist
ERROR: In:
ERROR:   [11] throw(error(existence_error(pack,real),_590))
ERROR:   [10] '$pack':'$pack_detach'(real,_628) at /Users/pmoura/lib/swipl/boot/packs.pl:67
ERROR:    [9] prolog_pack:pack_remove_forced(real) at /Users/pmoura/lib/swipl/library/prolog_pack.pl:1442
ERROR:    [7] <user>
ERROR: 
ERROR: Note: some frames are missing due to last-call optimization.
ERROR: Re-run your program in debug mode (:- debug.) to get more detail.

I.e. I get a warning at startup that a pack is not functional but then trying to remove it generates and error.

5

Thanks. Pushed 0521ad37993ac287017aeb85bf357fe4666e3ee3 to resolve this. Note that removing a package simply removes the directory. If it is an attached package it also removes the library directory, but as the directory doesn’t exist any longer that isn’t even necessary.

6

Thanks for the quick fix. Tested and confirmed.