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From: Thomas De Schampheleire <patrickdepinguin@gmail.com>
To: buildroot@buildroot.org
Date: Mon, 13 Sep 2021 09:29:41 +0200
Message-Id: <20210913072942.30109-1-patrickdepinguin@gmail.com>
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Subject: [Buildroot] [PATCH 1/2] docs/manual/using-buildroot-debugger:
 suggest '-ix' iso '-x' when loading gdbinit
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Cc: Thomas De Schampheleire <thomas.de_schampheleire@nokia.com>
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From: Thomas De Schampheleire <thomas.de_schampheleire@nokia.com>

A gdbinit file passed via '-x' will be read _after_ parsing any
object/core file passed on the command-line. In cross-compilation context,
this is particularly a problem when loading a core file, because without the
'sysroot' specified in the gdbinit file, it will give a lot of warnings,
like:

    warning: .dynamic section for "/lib/libstdc++.so.6" is not at the expected address (wrong library or version mismatch?)
    warning: .dynamic section for "/lib/librt.so.1" is not at the expected address (wrong library or version mismatch?)
    warning: .dynamic section for "/lib/libm.so.6" is not at the expected address (wrong library or version mismatch?)
    warning: .dynamic section for "/lib/libgcc_s.so.1" is not at the expected address (wrong library or version mismatch?)
    warning: .dynamic section for "/lib/libc.so.6" is not at the expected address (wrong library or version mismatch?)
    warning: .dynamic section for "/lib/ld-linux.so.2" is not at the expected address (wrong library or version mismatch?)
    warning: .dynamic section for "/lib/libanl.so.1" is not at the expected address (wrong library or version mismatch?)
    warning: .dynamic section for "/lib/libdl.so.2" is not at the expected address (wrong library or version mismatch?)
    warning: .dynamic section for "/lib/libpthread.so.0" is not at the expected address (wrong library or version mismatch?)
    warning: .dynamic section for "/usr/lib/libz.so.1" is not at the expected address (wrong library or version mismatch?)
    warning: .dynamic section for "/lib/libnss_files.so.2" is not at the expected address (wrong library or version mismatch?)

    warning: Could not load shared library symbols for 17 libraries, e.g. [...]
    Use the "info sharedlibrary" command to see the complete listing.
    Do you need "set solib-search-path" or "set sysroot"?

In contrast, the '-ix' option will load the specified gdbinit file _before_
parsing object/core files. This will remove said warnings.

See also: https://sourceware.org/bugzilla/show_bug.cgi?id=28330

Signed-off-by: Thomas De Schampheleire <thomas.de_schampheleire@nokia.com>
---
 docs/manual/using-buildroot-debugger.txt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docs/manual/using-buildroot-debugger.txt b/docs/manual/using-buildroot-debugger.txt
index d5293beb53..9a8a7dfbaf 100644
--- a/docs/manual/using-buildroot-debugger.txt
+++ b/docs/manual/using-buildroot-debugger.txt
@@ -35,7 +35,7 @@ Then, on the host, you should start the cross gdb using the following
 command line:
 
 ----------------------------
-<buildroot>/output/host/bin/<tuple>-gdb -x <buildroot>/output/staging/usr/share/buildroot/gdbinit foo
+<buildroot>/output/host/bin/<tuple>-gdb -ix <buildroot>/output/staging/usr/share/buildroot/gdbinit foo
 ----------------------------
 
 Of course, +foo+ must be available in the current directory, built
-- 
2.32.0

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