Re: 26.1: build on macOS failed

[charles@aurox.ch (Charles A. Roelli)]

> From: Zhang Haijun <ccsmile2008@outlook.com>
> Date: Sat, 9 Feb 2019 13:07:40 +0000
> 
> OS: macOS 10.13.6
> Xcode: 10.1
> 
> Configuration:
> CFLAGS="-O2" ./configure --without-makeinfo --with-ns --with-modules
> 
> Error message of make:
> 
> ...
> /Applications/Xcode.app/Contents/Developer/usr/bin/make -C lib-src all
>   CC       regex.o
>   CCLD     etags
> ld: warning: ignoring file ../lib/libgnu.a, file was built for archive which is not th
> e architecture being linked (x86_64): ../lib/libgnu.a
> Undefined symbols for architecture x86_64:
>   "_c_isalnum", referenced from:
>       _Asm_labels in etags-59ad2c.o
>       _Cobol_paragraphs in etags-59ad2c.o
>       _Erlang_functions in etags-59ad2c.o
>       _Perl_functions in etags-59ad2c.o
>       _Prolog_functions in etags-59ad2c.o
>       _Ruby_functions in etags-59ad2c.o
>       _Ada_getit in etags-59ad2c.o
>       ...
>   "_c_strcasecmp", referenced from:
>       _get_language_from_filename in etags-59ad2c.o
>   "_c_strncasecmp", referenced from:
>       _Forth_words in etags-59ad2c.o
>       _Fortran_functions in etags-59ad2c.o
>       _HTML_labels in etags-59ad2c.o
>   "_rpl_getopt_long", referenced from:
>       _main in etags-59ad2c.o
>   "_rpl_optarg", referenced from:
>       _main in etags-59ad2c.o
>   "_rpl_optind", referenced from:
>       _main in etags-59ad2c.o
> ld: symbol(s) not found for architecture x86_64
> clang: error: linker command failed with exit code 1 (use -v to see invocation)
> make[1]: *** [etags] Error 1
> make: *** [lib-src] Error 2

I can't produce this locally.  Can you please show the output of "make
V=1"?  Also, does the same issue occur in the latest pretest of Emacs
(26.1.91)?