[Bug 258823] devel/pkgconf: Fails to link with USE_LTO: eval: 1: Syntax error: "|" unexpected

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=258823

            Bug ID: 258823
           Summary: devel/pkgconf: Fails to link with USE_LTO: eval: 1:
                    Syntax error: "|" unexpected
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Keywords: needs-qa
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: bapt@FreeBSD.org
          Reporter: koobs@FreeBSD.org
        Depends on: 258820
             Flags: maintainer-feedback?(bapt@FreeBSD.org)
          Assignee: bapt@FreeBSD.org

FreeBSD 14.0-CURRENT #0 main-n248401-de0c7fbe280: Mon Aug  2 02:42:31 UTC 2021
GENERIC-NODEBUG  amd6

devel/pkgconf fails to link with USE_LTO enabled in the 'libpkgconf.la' target.
It appears a variable is empty, resulting in an empty pipe.

Summary:

Without USE_LTO: 

libpkgconf/.libs/parser.o   | sed -n -e 's/^.*[       
]\([BCDEGRST][BCDEGRST]*\)[     ][      ]*\([_A-Za-z][_A-Za-z0-9]*\)$/\1 \2
\2/p' | sed '/ __gnu_lto/d' | /usr/bin/sed 's/.* //' | sort | uniq >
.libs/libpkgconf.exp

With USE_LTO:

libpkgconf/.libs/parser.o   |  | /usr/bin/sed 's/.* //' | sort | uniq >
.libs/libpkgconf.exp
eval: 1: Syntax error: "|" unexpected

Search results for "BCDEGRST" "syntax error" point to libtool environment
modifications, potentially config.cache related

Full compile lines:


Without USE_LTO:

--- libpkgconf.la ---
libtool: link: /usr/bin/nm  libpkgconf/.libs/audit.o libpkgconf/.libs/cache.o
libpkgconf/.libs/client.o libpkgconf/.libs/pkg.o libpkgconf/.libs/bsdstubs.o
libpkgconf/.libs/fragment.o libpkgconf/.libs/argvsplit.o
libpkgconf/.libs/fileio.o libpkgconf/.libs/tuple.o
libpkgconf/.libs/dependency.o libpkgconf/.libs/queue.o libpkgconf/.libs/path.o
libpkgconf/.libs/personality.o libpkgconf/.libs/parser.o   | sed -n -e 's/^.*[ 
      ]\([BCDEGRST][BCDEGRST]*\)[     ][      ]*\([_A-Za-z][_A-Za-z0-9]*\)$/\1
\2 \2/p' | sed '/ __gnu_lto/d' | /usr/bin/sed 's/.* //' | sort | uniq >
.libs/libpkgconf.exp

With USE_LTO:

--- libpkgconf.la ---
/bin/sh ./libtool  --tag=CC    --mode=link cc
-DPERSONALITY_PATH=\"/usr/local/share/pkgconfig/personality.d:/usr/local/etc/pkgconfig/personality.d\"
-DPKG_DEFAULT_PATH=\"/usr/local/libdata/pkgconfig:/usr/libdata/pkgconfig\"
-DSYSTEM_INCLUDEDIR=\"/usr/include\" -DSYSTEM_LIBDIR=\"/usr/lib\"
-march=sandybridge -mtune=sandybridge -O2 -pipe -fcolor-diagnostics
-march=sandybridge  -flto=thin -fstack-protector-strong -fno-strict-aliasing 
-Wall -Wextra -Wformat=2 -std=gnu99  -no-undefined -version-info 3:0:0
-export-symbols-regex '^pkgconf_' -flto=thin -fstack-protector-strong -o
libpkgconf.la -rpath /usr/local/lib libpkgconf/audit.lo libpkgconf/cache.lo 
libpkgconf/client.lo libpkgconf/pkg.lo libpkgconf/bsdstubs.lo 
libpkgconf/fragment.lo libpkgconf/argvsplit.lo  libpkgconf/fileio.lo
libpkgconf/tuple.lo  libpkgconf/dependency.lo libpkgconf/queue.lo 
libpkgconf/path.lo libpkgconf/personality.lo  libpkgconf/parser.lo
libtool: link: /usr/bin/nm  libpkgconf/.libs/audit.o libpkgconf/.libs/cache.o
libpkgconf/.libs/client.o libpkgconf/.libs/pkg.o libpkgconf/.libs/bsdstubs.o
libpkgconf/.libs/fragment.o libpkgconf/.libs/argvsplit.o
libpkgconf/.libs/fileio.o libpkgconf/.libs/tuple.o
libpkgconf/.libs/dependency.o libpkgconf/.libs/queue.o libpkgconf/.libs/path.o
libpkgconf/.libs/personality.o libpkgconf/.libs/parser.o   |  | /usr/bin/sed
's/.* //' | sort | uniq > .libs/libpkgconf.exp
eval: 1: Syntax error: "|" unexpected
*** [libpkgconf.la] Error code 2


Referenced Bugs:

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=258820
[Bug 258820] devel/libffi: Fails to build with USE_LTO: libffi.a strip: file
format not recognized (propose: disable building static library)
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