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perf probe: Check if dwarf_getlocations() is available
If not, tell the user that: config/Makefile:273: Old libdw.h, finding variables at given 'perf probe' point will not work, install elfutils-devel/libdw-dev >= 0.157 And return -ENOTSUPP in die_get_var_range(), failing features that need it, like the one pointed out above. This fixes the build on older systems, such as Ubuntu 12.04.5. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Vinson Lee <vlee@freedesktop.org> Cc: Wang Nan <wangnan0@huawei.com> Link: http://lkml.kernel.org/n/tip-9l7luqkq4gfnx7vrklkq4obs@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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Arnaldo Carvalho de Melo
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Apr 6, 2016
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,12 @@ | ||
#include <stdlib.h> | ||
#include <elfutils/libdw.h> | ||
|
||
int main(void) | ||
{ | ||
Dwarf_Addr base, start, end; | ||
Dwarf_Attribute attr; | ||
Dwarf_Op *op; | ||
size_t nops; | ||
ptrdiff_t offset = 0; | ||
return (int)dwarf_getlocations(&attr, offset, &base, &start, &end, &op, &nops); | ||
} |
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