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configure: support libunwind of LLVM
The libunwind headers of LLVM are located in the subdirectory /usr/include/libunwind. Search that subdirectory when the default header test fails. Also extend the include path due to the transitive include of `<__libunwind_config.h>`. Closes: #894
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14
configure.ac
14
configure.ac
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@ -419,13 +419,23 @@ case "$enable_unwind" in
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AC_CHECK_LIB([lzma], [lzma_index_buffer_decode])
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fi
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AC_CHECK_LIB([unwind], [backtrace], [], [enable_unwind=no])
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AC_CHECK_HEADERS([libunwind.h], [], [enable_unwind=no])
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AC_CHECK_HEADERS([libunwind.h], [], [
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old_CFLAGS="$CFLAGS"
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CFLAGS="$CFLAGS -I/usr/include/libunwind"
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AC_CHECK_HEADERS([libunwind/libunwind.h], [], [
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enable_unwind=no
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CFLAGS="$old_CFLAGS"
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])
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])
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;;
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no)
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;;
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yes)
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AC_CHECK_LIB([unwind], [backtrace], [], [AC_MSG_ERROR([can not find required library libunwind])])
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AC_CHECK_HEADERS([libunwind.h], [], [AC_MSG_ERROR([can not find require header file libunwind.h])])
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AC_CHECK_HEADERS([libunwind.h], [], [
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CFLAGS="$CFLAGS -I/usr/include/libunwind"
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AC_CHECK_HEADERS([libunwind/libunwind.h], [], [AC_MSG_ERROR([can not find required header file libunwind.h])])
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])
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;;
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*)
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AC_MSG_ERROR([bad value '$enable_unwind' for --enable-unwind])
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