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build-sys: enable gcc Link Time Optimization when optimization is enabled
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@ -156,6 +156,10 @@ CC_CHECK_FLAGS_APPEND([with_cflags], [CFLAGS], [\
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-fdata-sections \
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-fstack-protector \
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--param=ssp-buffer-size=4])
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AS_CASE([$CFLAGS], [*-O[[12345\ ]]*],
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[CC_CHECK_FLAGS_APPEND([with_cflags], [CFLAGS], [\
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-flto])],
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[AC_MSG_RESULT([skipping -flto, optimization not enabled])])
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AC_SUBST([OUR_CFLAGS], "$with_cflags $address_sanitizer_cflags")
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AS_CASE([$CFLAGS], [*-O[[12345\ ]]*],
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