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Commitd995fd6

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Use CFLAGS_SL while probing linkability of libperl.
On recent Red Hat platforms (at least RHEL 8 and Fedora 30, maybe older),configure's probe for libperl failed if the user forces CFLAGS to be -O0.This is because some code in perl's inline.h fails to be optimized awayat -O0, and said code doesn't work if compiled without -fPIC.To fix, add CFLAGS_SL to the compile flags used during the libperl probe.This is a better simulation of the way that plperl is built, anyway,so it might forestall other issues in future.Per gripe from Kyotaro Horiguchi. Back-patch to all supported branches,since people might want to build older branches on these platforms.Discussion:https://postgr.es/m/20191010.144533.263180400.horikyota.ntt@gmail.com
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‎configure

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@@ -18490,6 +18490,10 @@ fi
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# On most platforms, if perl.h is there then libperl.so will be too, but at
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# this writing Debian packages them separately. There is no known reason to
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# waste cycles on separate probes for the Tcl or Python libraries, though.
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# On some Red Hat platforms, the link attempt can fail if we don't use
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# CFLAGS_SL while building the test program.
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ac_save_CFLAGS=$CFLAGS
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CFLAGS="$CFLAGS $CFLAGS_SL"
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pgac_save_LIBS=$LIBS
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LIBS="$perl_embed_ldflags"
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{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for libperl" >&5
@@ -18519,6 +18523,7 @@ fi
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rm -f core conftest.err conftest.$ac_objext \
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conftest$ac_exeext conftest.$ac_ext
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LIBS=$pgac_save_LIBS
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CFLAGS=$ac_save_CFLAGS
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CPPFLAGS=$ac_save_CPPFLAGS
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fi
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‎configure.in

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@@ -2253,6 +2253,10 @@ if test "$with_perl" = yes; then
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# On most platforms, if perl.h is there then libperl.so will be too, but at
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# this writing Debian packages them separately. There is no known reason to
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# waste cycles on separate probes for the Tcl or Python libraries, though.
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# On some Red Hat platforms, the link attempt can fail if we don't use
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# CFLAGS_SL while building the test program.
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ac_save_CFLAGS=$CFLAGS
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CFLAGS="$CFLAGS $CFLAGS_SL"
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pgac_save_LIBS=$LIBS
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LIBS="$perl_embed_ldflags"
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AC_MSG_CHECKING([for libperl])
@@ -2264,6 +2268,7 @@ if test "$with_perl" = yes; then
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[AC_MSG_RESULT(no)
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AC_MSG_ERROR([libperl library is required for Perl])])
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LIBS=$pgac_save_LIBS
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CFLAGS=$ac_save_CFLAGS
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CPPFLAGS=$ac_save_CPPFLAGS
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fi
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