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bpo-39761: Fix dtrace build with empty $DFLAGS (GH-18766)
This fixes a regression introduced in bpo-38960. When DFLAGS was empty, "$DFLAGS" results in an empty argument (""). Without the quotes, an empty variable will be ignored by the shell.
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Fix build with DTrace but without additional DFLAGS.
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configure
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configure
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@ -11487,7 +11487,7 @@ if ${ac_cv_dtrace_link+:} false; then :
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else
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ac_cv_dtrace_link=no
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echo 'BEGIN{}' > conftest.d
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"$DTRACE" "$DFLAGS" -G -s conftest.d -o conftest.o > /dev/null 2>&1 && \
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"$DTRACE" $DFLAGS -G -s conftest.d -o conftest.o > /dev/null 2>&1 && \
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ac_cv_dtrace_link=yes
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fi
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@ -3541,7 +3541,7 @@ then
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[ac_cv_dtrace_link], [dnl
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ac_cv_dtrace_link=no
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echo 'BEGIN{}' > conftest.d
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"$DTRACE" "$DFLAGS" -G -s conftest.d -o conftest.o > /dev/null 2>&1 && \
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"$DTRACE" $DFLAGS -G -s conftest.d -o conftest.o > /dev/null 2>&1 && \
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ac_cv_dtrace_link=yes
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])
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if test "$ac_cv_dtrace_link" = "yes"; then
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