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@@ -60,9 +60,10 @@ fi
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dnl --------------------
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dnl Check CC and friends
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dnl --------------------
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+AC_LANG([C])
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AC_PROG_CC
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AC_PROG_CPP
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-
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+AM_PROG_CC_C_O
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AC_PROG_EGREP
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dnl autoconf 2.59 appears not to support AC_PROG_SED
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@@ -1395,6 +1396,31 @@ dnl ----------
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CONFDATE=`date '+%Y%m%d'`
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AC_SUBST(CONFDATE)
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+dnl Conditionally enable PIE support for GNU toolchains.
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+enable_pie=yes
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+
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+AC_ARG_ENABLE(pie, AS_HELP_STRING([--disable-pie], [Do not build tools as a Position Independent Executables]))
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+if test "$enable_pie" = "yes"; then
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+ AC_CACHE_CHECK([whether $CC accepts PIE flags], [ap_cv_cc_pie], [
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+ save_CFLAGS=$CFLAGS
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+ save_LDFLAGS=$LDFLAGS
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+ CFLAGS="$CFLAGS -fPIE"
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+ LDFLAGS="$LDFLAGS -pie"
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+ AC_LINK_IFELSE([AC_LANG_SOURCE([[static int foo[30000]; int main () { return 0; }]])],
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+ [ap_cv_cc_pie=yes], [ap_cv_cc_pie=no]
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+ )
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+ CFLAGS=$save_CFLAGS
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+ LDFLAGS=$save_LDFLAGS
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+ ])
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+ if test "$ap_cv_cc_pie" = "yes"; then
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+ PICFLAGS="-fPIE"
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+ PILDFLAGS="-pie"
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+ fi
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+fi
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+
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+AC_SUBST(PICFLAGS)
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+AC_SUBST(PILDFLAGS)
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+
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dnl ------------------------------
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dnl set paths for state directory
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dnl ------------------------------
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