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@@ -623,7 +623,7 @@ AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [
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#endif])], have_clang=yes, have_clang=no)
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if test x$enable_gcc_hardening != xno; then
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- CFLAGS="$CFLAGS -D_FORTIFY_SOURCE=2"
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+ CFLAGS="$CFLAGS -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2"
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if test x$have_clang = xyes; then
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TOR_CHECK_CFLAGS(-Qunused-arguments)
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fi
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