Avoid -lgcc for heap profiling if unwind.h is missing.
This removes an unneeded library dependency when falling back to intrinsics-based backtracing (or failing to enable heap profiling at all).
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@ -1082,7 +1082,9 @@ fi
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if test "x$backtrace_method" = "x" -a "x$enable_prof_libgcc" = "x1" \
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if test "x$backtrace_method" = "x" -a "x$enable_prof_libgcc" = "x1" \
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-a "x$GCC" = "xyes" ; then
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-a "x$GCC" = "xyes" ; then
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AC_CHECK_HEADERS([unwind.h], , [enable_prof_libgcc="0"])
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AC_CHECK_HEADERS([unwind.h], , [enable_prof_libgcc="0"])
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if test "x${enable_prof_libgcc}" = "x1" ; then
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AC_CHECK_LIB([gcc], [_Unwind_Backtrace], [JE_APPEND_VS(LIBS, -lgcc)], [enable_prof_libgcc="0"])
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AC_CHECK_LIB([gcc], [_Unwind_Backtrace], [JE_APPEND_VS(LIBS, -lgcc)], [enable_prof_libgcc="0"])
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fi
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if test "x${enable_prof_libgcc}" = "x1" ; then
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if test "x${enable_prof_libgcc}" = "x1" ; then
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backtrace_method="libgcc"
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backtrace_method="libgcc"
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AC_DEFINE([JEMALLOC_PROF_LIBGCC], [ ])
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AC_DEFINE([JEMALLOC_PROF_LIBGCC], [ ])
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