linux-kernel - [PATCH v2 3/3] perf dwarf-aux: Fix build fail when HAVE_DWARF_GETLOCATIONS

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Message-Id: <20240806114801.1652417-4-yangjihong@bytedance.com>
Date: Tue,  6 Aug 2024 19:48:01 +0800
From: Yang Jihong <yangjihong@...edance.com>
To: peterz@...radead.org,
	mingo@...hat.com,
	acme@...nel.org,
	namhyung@...nel.org,
	mark.rutland@....com,
	alexander.shishkin@...ux.intel.com,
	jolsa@...nel.org,
	irogers@...gle.com,
	adrian.hunter@...el.com,
	kan.liang@...ux.intel.com,
	linux-perf-users@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: yangjihong@...edance.com
Subject: [PATCH v2 3/3] perf dwarf-aux: Fix build fail when HAVE_DWARF_GETLOCATIONS_SUPPORT undefined

commit 3796eba7c137 move #else block of #ifdef HAVE_DWARF_GETLOCATIONS_SUPPORT
code from dwarf-aux.c to dwarf-aux.h, in which die_get_var_range() used ENOTSUP
macro, but dwarf-aux.h was not self-contained and did not include file errno.h.

As a result, the build failed when HAVE_DWARF_GETLOCATIONS_SUPPORT macro was not
defined, and the error log is as follows:

  In file included from util/disasm.h:8,
                   from util/annotate.h:16,
                   from builtin-top.c:23:
  util/dwarf-aux.h: In function 'die_get_var_range':
  util/dwarf-aux.h:184:10: error: 'ENOTSUP' undeclared (first use in this function)
    184 |  return -ENOTSUP;
        |          ^~~~~~~
  util/dwarf-aux.h:184:10: note: each undeclared identifier is reported only once for each function it appears

Fixes: 3796eba7c137 ("perf dwarf-aux: Move #else block of #ifdef HAVE_DWARF_GETLOCATIONS_SUPPORT code to the header file")
Signed-off-by: Yang Jihong <yangjihong@...edance.com>
---
 tools/perf/util/dwarf-aux.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/perf/util/dwarf-aux.h b/tools/perf/util/dwarf-aux.h
index 24446412b869..d2903894538e 100644
--- a/tools/perf/util/dwarf-aux.h
+++ b/tools/perf/util/dwarf-aux.h
@@ -5,6 +5,7 @@
  * dwarf-aux.h : libdw auxiliary interfaces
  */
 
+#include <errno.h>
 #include <dwarf.h>
 #include <elfutils/libdw.h>
 #include <elfutils/libdwfl.h>
-- 
2.25.1