Why does `ldd ` output “??? => ???” (question marks in both library and location)?Why does ldd show...
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Why does `ldd ` output “??? => ???” (question marks in both library and location)?
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Running ldd <dynamic_lib>, I noticed that there are some entries that read ??? => ???. Searching for a variety of combinations of "Linux", "ldd" and "??? => ???", both via search engine and on this site did not turn up anything.
Possibly relevant: the dynamic library in question was compiled on Windows 10 under MSYS2 using the built-in GCC Suite.
windows gcc dynamic-linking msys
asked yesterday
JDQJDQ
83 bronze badges
add a comment |
Running ldd <dynamic_lib>, I noticed that there are some entries that read ??? => ???. Searching for a variety of combinations of "Linux", "ldd" and "??? => ???", both via search engine and on this site did not turn up anything.
Possibly relevant: the dynamic library in question was compiled on Windows 10 under MSYS2 using the built-in GCC Suite.
windows gcc dynamic-linking msys
asked yesterday
JDQJDQ
83 bronze badges
1
Possibly relevant: github.com/msys2/MINGW-packages/issues/4164
– muru
16 hours ago
@muru I had resisted installing ntldd because I was working under the vanilla MSYS2 terminal, but I just downloaded it and it does seem very useful. Thanks!
– JDQ
10 hours ago
add a comment |
Running ldd <dynamic_lib>, I noticed that there are some entries that read ??? => ???. Searching for a variety of combinations of "Linux", "ldd" and "??? => ???", both via search engine and on this site did not turn up anything.
Possibly relevant: the dynamic library in question was compiled on Windows 10 under MSYS2 using the built-in GCC Suite.
windows gcc dynamic-linking msys
asked yesterday
JDQJDQ
83 bronze badges
Running ldd <dynamic_lib>, I noticed that there are some entries that read ??? => ???. Searching for a variety of combinations of "Linux", "ldd" and "??? => ???", both via search engine and on this site did not turn up anything.
Possibly relevant: the dynamic library in question was compiled on Windows 10 under MSYS2 using the built-in GCC Suite.
windows gcc dynamic-linking msys
windows gcc dynamic-linking msys
asked yesterday
JDQJDQ
83 bronze badges
asked yesterday
JDQJDQ
83 bronze badges
edited 10 hours ago
JDQ
asked yesterday
JDQJDQ
83 bronze badges
asked yesterday
JDQJDQ
83 bronze badges
asked yesterday
JDQJDQ
83 bronze badges
83 bronze badges
1
Possibly relevant: github.com/msys2/MINGW-packages/issues/4164
– muru
16 hours ago
@muru I had resisted installing ntldd because I was working under the vanilla MSYS2 terminal, but I just downloaded it and it does seem very useful. Thanks!
– JDQ
10 hours ago
add a comment |
1
Possibly relevant: github.com/msys2/MINGW-packages/issues/4164
– muru
16 hours ago
@muru I had resisted installing ntldd because I was working under the vanilla MSYS2 terminal, but I just downloaded it and it does seem very useful. Thanks!
– JDQ
10 hours ago
1
1
Possibly relevant: github.com/msys2/MINGW-packages/issues/4164
– muru
16 hours ago
Possibly relevant: github.com/msys2/MINGW-packages/issues/4164
– muru
16 hours ago
@muru I had resisted installing ntldd because I was working under the vanilla MSYS2 terminal, but I just downloaded it and it does seem very useful. Thanks!
– JDQ
10 hours ago
@muru I had resisted installing ntldd because I was working under the vanilla MSYS2 terminal, but I just downloaded it and it does seem very useful. Thanks!
– JDQ
10 hours ago
add a comment |
1 Answer
1
active
oldest
votes
The ldd command tries to link an executable or library to shared libraries in your system just as it happens when you run / use it. It will read library references from the given file and try to find them in your file system and path (LD_LIBRARY_PATH). If it displays "???" then this means that it cannot find some libraries in your system (and the program / library you have examined is likely not to run / be usable).
Often you will run into problems with libraries when you copy a file (executable or shared object library) from one system to another. The reason are differing system libraries - even if these only differ by version and otherwise exist.
Sometimes a solution is to copy missing libraries, too, and placing them in a folder that is included in LD_LIBRARY_PATH. You may also set that variable for this purpose, or append a new folder because you do not want to install those copied library files into your system (!).
You can find out which libraries to copy by running ldd on the original system.
If this is your own program or you have compiled it yourself you may in fact know which libraries are missing.
Once you have identified your libraries, you could copy them in a personal folder, e.g. into ~/libs. Then add this folder into your library path:
export LD_LIBRARY_PATH="${LD_LIBRARY_PATH}":~/libs
if the variable already exists (test by echo $LD_LIBRARY_PATH), or
export LD_LIBRARY_PATH=~/libs
if it does not (both bash-style shell syntax).
Then, try ldd again.
Later, you could start your actual program always using a shell script that sets the variable, then starts your program.
answered 16 hours ago
Ned64Ned64
3,2341 gold badge16 silver badges42 bronze badges
In my case, I have compiled the library myself and I am attempting to load it on the same system. It is likely that my issue is indeed that the paths to the missing libraries are not included on LD_LIBRARY_PATH.
– JDQ
10 hours ago
@JDQ OK, added something to the answer, please test and let me know.
– Ned64
10 hours ago
add a comment |
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1 Answer
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1 Answer
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The ldd command tries to link an executable or library to shared libraries in your system just as it happens when you run / use it. It will read library references from the given file and try to find them in your file system and path (LD_LIBRARY_PATH). If it displays "???" then this means that it cannot find some libraries in your system (and the program / library you have examined is likely not to run / be usable).
Often you will run into problems with libraries when you copy a file (executable or shared object library) from one system to another. The reason are differing system libraries - even if these only differ by version and otherwise exist.
Sometimes a solution is to copy missing libraries, too, and placing them in a folder that is included in LD_LIBRARY_PATH. You may also set that variable for this purpose, or append a new folder because you do not want to install those copied library files into your system (!).
You can find out which libraries to copy by running ldd on the original system.
If this is your own program or you have compiled it yourself you may in fact know which libraries are missing.
Once you have identified your libraries, you could copy them in a personal folder, e.g. into ~/libs. Then add this folder into your library path:
export LD_LIBRARY_PATH="${LD_LIBRARY_PATH}":~/libs
if the variable already exists (test by echo $LD_LIBRARY_PATH), or
export LD_LIBRARY_PATH=~/libs
if it does not (both bash-style shell syntax).
Then, try ldd again.
Later, you could start your actual program always using a shell script that sets the variable, then starts your program.
answered 16 hours ago
Ned64Ned64
3,2341 gold badge16 silver badges42 bronze badges
In my case, I have compiled the library myself and I am attempting to load it on the same system. It is likely that my issue is indeed that the paths to the missing libraries are not included on LD_LIBRARY_PATH.
– JDQ
10 hours ago
@JDQ OK, added something to the answer, please test and let me know.
– Ned64
10 hours ago
add a comment |
The ldd command tries to link an executable or library to shared libraries in your system just as it happens when you run / use it. It will read library references from the given file and try to find them in your file system and path (LD_LIBRARY_PATH). If it displays "???" then this means that it cannot find some libraries in your system (and the program / library you have examined is likely not to run / be usable).
Often you will run into problems with libraries when you copy a file (executable or shared object library) from one system to another. The reason are differing system libraries - even if these only differ by version and otherwise exist.
Sometimes a solution is to copy missing libraries, too, and placing them in a folder that is included in LD_LIBRARY_PATH. You may also set that variable for this purpose, or append a new folder because you do not want to install those copied library files into your system (!).
You can find out which libraries to copy by running ldd on the original system.
If this is your own program or you have compiled it yourself you may in fact know which libraries are missing.
Once you have identified your libraries, you could copy them in a personal folder, e.g. into ~/libs. Then add this folder into your library path:
export LD_LIBRARY_PATH="${LD_LIBRARY_PATH}":~/libs
if the variable already exists (test by echo $LD_LIBRARY_PATH), or
export LD_LIBRARY_PATH=~/libs
if it does not (both bash-style shell syntax).
Then, try ldd again.
Later, you could start your actual program always using a shell script that sets the variable, then starts your program.
answered 16 hours ago
Ned64Ned64
3,2341 gold badge16 silver badges42 bronze badges
In my case, I have compiled the library myself and I am attempting to load it on the same system. It is likely that my issue is indeed that the paths to the missing libraries are not included on LD_LIBRARY_PATH.
– JDQ
10 hours ago
@JDQ OK, added something to the answer, please test and let me know.
– Ned64
10 hours ago
add a comment |
The ldd command tries to link an executable or library to shared libraries in your system just as it happens when you run / use it. It will read library references from the given file and try to find them in your file system and path (LD_LIBRARY_PATH). If it displays "???" then this means that it cannot find some libraries in your system (and the program / library you have examined is likely not to run / be usable).
Often you will run into problems with libraries when you copy a file (executable or shared object library) from one system to another. The reason are differing system libraries - even if these only differ by version and otherwise exist.
Sometimes a solution is to copy missing libraries, too, and placing them in a folder that is included in LD_LIBRARY_PATH. You may also set that variable for this purpose, or append a new folder because you do not want to install those copied library files into your system (!).
You can find out which libraries to copy by running ldd on the original system.
If this is your own program or you have compiled it yourself you may in fact know which libraries are missing.
Once you have identified your libraries, you could copy them in a personal folder, e.g. into ~/libs. Then add this folder into your library path:
export LD_LIBRARY_PATH="${LD_LIBRARY_PATH}":~/libs
if the variable already exists (test by echo $LD_LIBRARY_PATH), or
export LD_LIBRARY_PATH=~/libs
if it does not (both bash-style shell syntax).
Then, try ldd again.
Later, you could start your actual program always using a shell script that sets the variable, then starts your program.
answered 16 hours ago
Ned64Ned64
3,2341 gold badge16 silver badges42 bronze badges
The ldd command tries to link an executable or library to shared libraries in your system just as it happens when you run / use it. It will read library references from the given file and try to find them in your file system and path (LD_LIBRARY_PATH). If it displays "???" then this means that it cannot find some libraries in your system (and the program / library you have examined is likely not to run / be usable).
Often you will run into problems with libraries when you copy a file (executable or shared object library) from one system to another. The reason are differing system libraries - even if these only differ by version and otherwise exist.
Sometimes a solution is to copy missing libraries, too, and placing them in a folder that is included in LD_LIBRARY_PATH. You may also set that variable for this purpose, or append a new folder because you do not want to install those copied library files into your system (!).
You can find out which libraries to copy by running ldd on the original system.
If this is your own program or you have compiled it yourself you may in fact know which libraries are missing.
Once you have identified your libraries, you could copy them in a personal folder, e.g. into ~/libs. Then add this folder into your library path:
export LD_LIBRARY_PATH="${LD_LIBRARY_PATH}":~/libs
if the variable already exists (test by echo $LD_LIBRARY_PATH), or
export LD_LIBRARY_PATH=~/libs
if it does not (both bash-style shell syntax).
Then, try ldd again.
Later, you could start your actual program always using a shell script that sets the variable, then starts your program.
answered 16 hours ago
Ned64Ned64
3,2341 gold badge16 silver badges42 bronze badges
edited 10 hours ago
answered 16 hours ago
Ned64Ned64
3,2341 gold badge16 silver badges42 bronze badges
answered 16 hours ago
Ned64Ned64
3,2341 gold badge16 silver badges42 bronze badges
answered 16 hours ago
Ned64Ned64
3,2341 gold badge16 silver badges42 bronze badges
3,2341 gold badge16 silver badges42 bronze badges
In my case, I have compiled the library myself and I am attempting to load it on the same system. It is likely that my issue is indeed that the paths to the missing libraries are not included on LD_LIBRARY_PATH.
– JDQ
10 hours ago
@JDQ OK, added something to the answer, please test and let me know.
– Ned64
10 hours ago
add a comment |
In my case, I have compiled the library myself and I am attempting to load it on the same system. It is likely that my issue is indeed that the paths to the missing libraries are not included on LD_LIBRARY_PATH.
– JDQ
10 hours ago
@JDQ OK, added something to the answer, please test and let me know.
– Ned64
10 hours ago
In my case, I have compiled the library myself and I am attempting to load it on the same system. It is likely that my issue is indeed that the paths to the missing libraries are not included on LD_LIBRARY_PATH.
– JDQ
10 hours ago
In my case, I have compiled the library myself and I am attempting to load it on the same system. It is likely that my issue is indeed that the paths to the missing libraries are not included on LD_LIBRARY_PATH.
– JDQ
10 hours ago
@JDQ OK, added something to the answer, please test and let me know.
– Ned64
10 hours ago
@JDQ OK, added something to the answer, please test and let me know.
– Ned64
10 hours ago
add a comment |
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1
Possibly relevant: github.com/msys2/MINGW-packages/issues/4164
– muru
16 hours ago
@muru I had resisted installing ntldd because I was working under the vanilla MSYS2 terminal, but I just downloaded it and it does seem very useful. Thanks!
– JDQ
10 hours ago