Hello Monks, I'm trying to build PDL from CPAN on: 
This is perl 5, version 18, subversion 2 (v5.18.2) built for darwin-th
+read-multi-2level
(with 2 registered patches, see perl -V for more detail)

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in macOS 10.13.3. The PDL build fails because PerlIO::Layers 0.011 build fails. When I attempt to compile Layers.c stand-alone, to see what the compiler is seeing and doing I get: 
$ cc -I/System/Library/Perl/5.18/darwin-thread-multi-2level/CORE -DXS_
+VERSION="0.011" -DVERSION="0.011" -c -arch x86_64 -arch i386 -g -pipe
+ -fno-common -DPERL_DARWIN -fno-strict-aliasing -fstack-protector -Os
+ -o lib/PerlIO/Layers.o lib/PerlIO/Layers.c
lib/PerlIO/Layers.c:249:5: error: expected ')'
    XS_VERSION_BOOTCHECK;
    ^
/System/Library/Perl/5.18/darwin-thread-multi-2level/CORE/XSUB.h:328:6
+1: note: expanded
      from macro 'XS_VERSION_BOOTCHECK'
    Perl_xs_version_bootcheck(aTHX_ items, ax, STR_WITH_LEN(XS_VERSION
+))
                                                            ^
<command line>:1:20: note: expanded from here
#define XS_VERSION 0.011
                   ^
lib/PerlIO/Layers.c:249:5: note: to match this '('
/System/Library/Perl/5.18/darwin-thread-multi-2level/CORE/XSUB.h:328:4
+8: note: expanded
      from macro 'XS_VERSION_BOOTCHECK'
    Perl_xs_version_bootcheck(aTHX_ items, ax, STR_WITH_LEN(XS_VERSION
+))
                                               ^
/System/Library/Perl/5.18/darwin-thread-multi-2level/CORE/handy.h:348:
+26: note: expanded
      from macro 'STR_WITH_LEN'
#define STR_WITH_LEN(s)  ("" s ""), (sizeof(s)-1)
                         ^
1 error generated.

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The compiler is: 
$ file `which cc`
/usr/bin/cc: Mach-O 64-bit executable x86_64
$ cc -v
Apple LLVM version 9.0.0 (clang-900.0.39.2)
Target: x86_64-apple-darwin17.4.0
Thread model: posix
InstalledDir: /Library/Developer/CommandLineTools/usr/bin

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The Build file seems to be expanding the XS_VERSION_BOOTCHECK macro correctly as -DXS_VERSION="0.011" is being passed as a quoted string. Any ideas, as this is a deal-killer for building PDL from sources? As of now the latest binary build for macOS of PDL will not execute on 10.13.3, probably because it needs to be recompiled with the 10.13 compiler and libraries.

Thanks for your help.

In reply to PerlIO::Layers 0.011 fails to build in macOS 10.13.3 by perlboy_emeritus

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