# config/perl.m4


# PGAC_PATH_PERL
# --------------
AC_DEFUN([PGAC_PATH_PERL],
[# Let the user override the search
if test -z "$PERL"; then
  AC_PATH_PROG(PERL, perl)
fi

if test "$PERL"; then
  pgac_perl_version=`$PERL -v 2>/dev/null | sed -n ['s/This is perl.*v[a-z ]*\([0-9]\.[0-9][0-9.]*\).*$/\1/p']`
  AC_MSG_NOTICE([using perl $pgac_perl_version])
  if echo "$pgac_perl_version" | sed ['s/[.a-z_]/ /g'] | \
    $AWK '{ if ([$]1 = 5 && [$]2 >= 6) exit 1; else exit 0;}'
  then
    AC_MSG_WARN([
*** The installed version of Perl, $PERL, is too old to use with PostgreSQL.
*** Perl version 5.6 or later is required, but this is $pgac_perl_version.])
    PERL=""
  fi
fi

if test -z "$PERL"; then
  AC_MSG_WARN([
*** Without Perl you will not be able to build PostgreSQL from Git.
*** You can obtain Perl from any CPAN mirror site.
*** (If you are using the official distribution of PostgreSQL then you do not
*** need to worry about this, because the Perl output is pre-generated.)])
fi
])# PGAC_PATH_PERL

# PGAC_CHECK_PERL_MODULE(NAME)
# ----------------------------
AC_DEFUN([PGAC_CHECK_PERL_MODULE],
[AC_REQUIRE([PGAC_PATH_PERL])
AC_MSG_CHECKING([for Perl module $1])
$PERL -MJSON -e 1
perl_$1=$?
if [[ $perl_$1 -ne 0 ]]; then
	AC_MSG_ERROR([
*** Perl JSON module is not installed. You could install it using the cpan utility.
*** Or try to install the perl-JSON package if you are building on Linux. ])
else
	AC_MSG_RESULT([yes])
fi
]) # PGAC_CHECK_PERL_MODULE

# PGAC_CHECK_PERL_MODULES(NAMES)
# ------------------------------
AC_DEFUN([PGAC_CHECK_PERL_MODULES],
[m4_foreach([pgac_item], [$1], [PGAC_CHECK_PERL_MODULE(pgac_item)])])

# PGAC_CHECK_PERL_CONFIG(NAME)
# ----------------------------
AC_DEFUN([PGAC_CHECK_PERL_CONFIG],
[AC_REQUIRE([PGAC_PATH_PERL])
AC_MSG_CHECKING([for Perl $1])
perl_$1=`$PERL -MConfig -e 'print $Config{$1}'`
AC_SUBST(perl_$1)dnl
AC_MSG_RESULT([$perl_$1])])


# PGAC_CHECK_PERL_CONFIGS(NAMES)
# ------------------------------
AC_DEFUN([PGAC_CHECK_PERL_CONFIGS],
[m4_foreach([pgac_item], [$1], [PGAC_CHECK_PERL_CONFIG(pgac_item)])])


# PGAC_CHECK_PERL_EMBED_LDFLAGS
# -----------------------------
# We are after Embed's ldopts, but without the subset mentioned in
# Config's ccdlflags; and also without any -arch flags, which recent
# Apple releases put in unhelpfully.  (If you want a multiarch build
# you'd better be specifying it in more places than plperl's final link.)
AC_DEFUN([PGAC_CHECK_PERL_EMBED_LDFLAGS],
[AC_REQUIRE([PGAC_PATH_PERL])
AC_MSG_CHECKING(for flags to link embedded Perl)
pgac_tmp1=`$PERL -MExtUtils::Embed -e ldopts`
pgac_tmp2=`$PERL -MConfig -e 'print $Config{ccdlflags}'`
perl_embed_ldflags=`echo X"$pgac_tmp1" | sed -e "s/^X//" -e "s%$pgac_tmp2%%" -e ["s/ -arch [-a-zA-Z0-9_]*//g"]`
AC_SUBST(perl_embed_ldflags)dnl
if test -z "$perl_embed_ldflags" ; then
	AC_MSG_RESULT(no)
	AC_MSG_ERROR([could not determine flags for linking embedded Perl.
This probably means that ExtUtils::Embed or ExtUtils::MakeMaker is not
installed.])
else
	AC_MSG_RESULT([$perl_embed_ldflags])
fi
])# PGAC_CHECK_PERL_EMBED_LDFLAGS