Is it normal that LD_LIBRARY_PATH variable is missing from an environment?
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I have found by coincidence that on my Debian Jessie there is no LD_LIBRARY_PATH variable (to be exact printenv | grep LD shows nothing related to linker and echo "$LD_LIBRARY_PATH" shows also nothing).
This is the case in x terminal emulator (which might clear it due to setgid) as well as in basic terminal (Ctrl+Alt+F1).
I know that LD_LIBRARY_PATH may be considered bad so Debian may block it somehow, but on the other hand there are a few files in /etc/ld.so.conf.d/ that contains some directories to be added to LD_LIBRARY_PATH. None of my rc files (that I know of) mess with LD_LIBRARY_PATH either.
Why I don't see an LD_LIBRARY_PATH variable?
linux environment-variables ld
edited Sep 26 '17 at 11:21
Kusalananda
106k14209327
asked Sep 26 '17 at 11:04
calavera.info
291112
add a comment |Â
up vote
14
down vote
favorite
I have found by coincidence that on my Debian Jessie there is no LD_LIBRARY_PATH variable (to be exact printenv | grep LD shows nothing related to linker and echo "$LD_LIBRARY_PATH" shows also nothing).
This is the case in x terminal emulator (which might clear it due to setgid) as well as in basic terminal (Ctrl+Alt+F1).
I know that LD_LIBRARY_PATH may be considered bad so Debian may block it somehow, but on the other hand there are a few files in /etc/ld.so.conf.d/ that contains some directories to be added to LD_LIBRARY_PATH. None of my rc files (that I know of) mess with LD_LIBRARY_PATH either.
Why I don't see an LD_LIBRARY_PATH variable?
linux environment-variables ld
edited Sep 26 '17 at 11:21
Kusalananda
106k14209327
asked Sep 26 '17 at 11:04
calavera.info
291112
add a comment |Â
up vote
14
down vote
favorite
up vote
14
down vote
favorite
I have found by coincidence that on my Debian Jessie there is no LD_LIBRARY_PATH variable (to be exact printenv | grep LD shows nothing related to linker and echo "$LD_LIBRARY_PATH" shows also nothing).
This is the case in x terminal emulator (which might clear it due to setgid) as well as in basic terminal (Ctrl+Alt+F1).
I know that LD_LIBRARY_PATH may be considered bad so Debian may block it somehow, but on the other hand there are a few files in /etc/ld.so.conf.d/ that contains some directories to be added to LD_LIBRARY_PATH. None of my rc files (that I know of) mess with LD_LIBRARY_PATH either.
Why I don't see an LD_LIBRARY_PATH variable?
linux environment-variables ld
edited Sep 26 '17 at 11:21
Kusalananda
106k14209327
asked Sep 26 '17 at 11:04
calavera.info
291112
I have found by coincidence that on my Debian Jessie there is no LD_LIBRARY_PATH variable (to be exact printenv | grep LD shows nothing related to linker and echo "$LD_LIBRARY_PATH" shows also nothing).
This is the case in x terminal emulator (which might clear it due to setgid) as well as in basic terminal (Ctrl+Alt+F1).
I know that LD_LIBRARY_PATH may be considered bad so Debian may block it somehow, but on the other hand there are a few files in /etc/ld.so.conf.d/ that contains some directories to be added to LD_LIBRARY_PATH. None of my rc files (that I know of) mess with LD_LIBRARY_PATH either.
Why I don't see an LD_LIBRARY_PATH variable?
linux environment-variables ld
linux environment-variables ld
edited Sep 26 '17 at 11:21
Kusalananda
106k14209327
asked Sep 26 '17 at 11:04
calavera.info
291112
edited Sep 26 '17 at 11:21
Kusalananda
106k14209327
asked Sep 26 '17 at 11:04
calavera.info
291112
edited Sep 26 '17 at 11:21
Kusalananda
106k14209327
edited Sep 26 '17 at 11:21
Kusalananda
106k14209327
edited Sep 26 '17 at 11:21
Kusalananda
106k14209327
106k14209327
asked Sep 26 '17 at 11:04
calavera.info
291112
asked Sep 26 '17 at 11:04
calavera.info
291112
asked Sep 26 '17 at 11:04
calavera.info
291112
291112
add a comment |Â
add a comment |Â
1 Answer
1
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up vote
22
down vote
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Yes, it is normal that you don't have any explicit LD_LIBRARY_PATH. Read also ldconfig(8) and ld-linux(8) and about the rpath. Notice that ldconfig updates /etc/ld.so.cache, not the LD_LIBRARY_PATH. Sometimes you'll set the rpath of an executable explicitly with -Wl,-rpath,directory passed to gcc at link time.
If you need a LD_LIBRARY_PATH (but you probably should not), set it yourself (e.g. in ~/.bashrc).
If you need system wide settings, you could e.g. consider adding /usr/local/lib/ in /etc/ld.so.conf and run ldconfig after installation of every library there.
AFAIK $LD_LIBRARY_PATH is used only by the dynamic linker ld-linux.so (and by dlopen(3) which uses it) after execve(2). See also ldd(1).
Read Drepper's How To Write Shared Libraries for more.
answered Sep 26 '17 at 11:06
Basile Starynkevitch
7,9231940
That was my mistake, I though that LD_LIBRARY_PATH is the product of runningldconfig. Meanwhile it is the input of ldconfig alongside with files in/etc/ld.so.conf.
– calavera.info
Sep 26 '17 at 11:13
1
My feeling is thatldconfigdon't use$LD_LIBRARY_PATH(which is only used atld-linux.sotime)
– Basile Starynkevitch
Sep 26 '17 at 11:15
3
@calavera.info it's neither. The dynamic linker usesLD_LIBRARY_PATHtogether with the output ofldconfigat runtime.ldconfigneither uses nor changesLD_LIBRARY_PATH.
– hobbs
Sep 26 '17 at 19:37
Now I can see that I had it totally messed up, probably by spending too much time in Java, where "classpath" is virtualy the only configuration of dynamic linking. Everything seems to be clear now, thanks a lot.
– calavera.info
Sep 27 '17 at 8:41
add a comment |Â
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
22
down vote
accepted
Yes, it is normal that you don't have any explicit LD_LIBRARY_PATH. Read also ldconfig(8) and ld-linux(8) and about the rpath. Notice that ldconfig updates /etc/ld.so.cache, not the LD_LIBRARY_PATH. Sometimes you'll set the rpath of an executable explicitly with -Wl,-rpath,directory passed to gcc at link time.
If you need a LD_LIBRARY_PATH (but you probably should not), set it yourself (e.g. in ~/.bashrc).
If you need system wide settings, you could e.g. consider adding /usr/local/lib/ in /etc/ld.so.conf and run ldconfig after installation of every library there.
AFAIK $LD_LIBRARY_PATH is used only by the dynamic linker ld-linux.so (and by dlopen(3) which uses it) after execve(2). See also ldd(1).
Read Drepper's How To Write Shared Libraries for more.
answered Sep 26 '17 at 11:06
Basile Starynkevitch
7,9231940
That was my mistake, I though that LD_LIBRARY_PATH is the product of runningldconfig. Meanwhile it is the input of ldconfig alongside with files in/etc/ld.so.conf.
– calavera.info
Sep 26 '17 at 11:13
1
My feeling is thatldconfigdon't use$LD_LIBRARY_PATH(which is only used atld-linux.sotime)
– Basile Starynkevitch
Sep 26 '17 at 11:15
3
@calavera.info it's neither. The dynamic linker usesLD_LIBRARY_PATHtogether with the output ofldconfigat runtime.ldconfigneither uses nor changesLD_LIBRARY_PATH.
– hobbs
Sep 26 '17 at 19:37
Now I can see that I had it totally messed up, probably by spending too much time in Java, where "classpath" is virtualy the only configuration of dynamic linking. Everything seems to be clear now, thanks a lot.
– calavera.info
Sep 27 '17 at 8:41
add a comment |Â
up vote
22
down vote
accepted
Yes, it is normal that you don't have any explicit LD_LIBRARY_PATH. Read also ldconfig(8) and ld-linux(8) and about the rpath. Notice that ldconfig updates /etc/ld.so.cache, not the LD_LIBRARY_PATH. Sometimes you'll set the rpath of an executable explicitly with -Wl,-rpath,directory passed to gcc at link time.
If you need a LD_LIBRARY_PATH (but you probably should not), set it yourself (e.g. in ~/.bashrc).
If you need system wide settings, you could e.g. consider adding /usr/local/lib/ in /etc/ld.so.conf and run ldconfig after installation of every library there.
AFAIK $LD_LIBRARY_PATH is used only by the dynamic linker ld-linux.so (and by dlopen(3) which uses it) after execve(2). See also ldd(1).
Read Drepper's How To Write Shared Libraries for more.
answered Sep 26 '17 at 11:06
Basile Starynkevitch
7,9231940
That was my mistake, I though that LD_LIBRARY_PATH is the product of runningldconfig. Meanwhile it is the input of ldconfig alongside with files in/etc/ld.so.conf.
– calavera.info
Sep 26 '17 at 11:13
1
My feeling is thatldconfigdon't use$LD_LIBRARY_PATH(which is only used atld-linux.sotime)
– Basile Starynkevitch
Sep 26 '17 at 11:15
3
@calavera.info it's neither. The dynamic linker usesLD_LIBRARY_PATHtogether with the output ofldconfigat runtime.ldconfigneither uses nor changesLD_LIBRARY_PATH.
– hobbs
Sep 26 '17 at 19:37
Now I can see that I had it totally messed up, probably by spending too much time in Java, where "classpath" is virtualy the only configuration of dynamic linking. Everything seems to be clear now, thanks a lot.
– calavera.info
Sep 27 '17 at 8:41
add a comment |Â
up vote
22
down vote
accepted
up vote
22
down vote
accepted
Yes, it is normal that you don't have any explicit LD_LIBRARY_PATH. Read also ldconfig(8) and ld-linux(8) and about the rpath. Notice that ldconfig updates /etc/ld.so.cache, not the LD_LIBRARY_PATH. Sometimes you'll set the rpath of an executable explicitly with -Wl,-rpath,directory passed to gcc at link time.
If you need a LD_LIBRARY_PATH (but you probably should not), set it yourself (e.g. in ~/.bashrc).
If you need system wide settings, you could e.g. consider adding /usr/local/lib/ in /etc/ld.so.conf and run ldconfig after installation of every library there.
AFAIK $LD_LIBRARY_PATH is used only by the dynamic linker ld-linux.so (and by dlopen(3) which uses it) after execve(2). See also ldd(1).
Read Drepper's How To Write Shared Libraries for more.
answered Sep 26 '17 at 11:06
Basile Starynkevitch
7,9231940
Yes, it is normal that you don't have any explicit LD_LIBRARY_PATH. Read also ldconfig(8) and ld-linux(8) and about the rpath. Notice that ldconfig updates /etc/ld.so.cache, not the LD_LIBRARY_PATH. Sometimes you'll set the rpath of an executable explicitly with -Wl,-rpath,directory passed to gcc at link time.
If you need a LD_LIBRARY_PATH (but you probably should not), set it yourself (e.g. in ~/.bashrc).
If you need system wide settings, you could e.g. consider adding /usr/local/lib/ in /etc/ld.so.conf and run ldconfig after installation of every library there.
AFAIK $LD_LIBRARY_PATH is used only by the dynamic linker ld-linux.so (and by dlopen(3) which uses it) after execve(2). See also ldd(1).
Read Drepper's How To Write Shared Libraries for more.
answered Sep 26 '17 at 11:06
Basile Starynkevitch
7,9231940
edited Sep 26 '17 at 11:19
answered Sep 26 '17 at 11:06
Basile Starynkevitch
7,9231940
answered Sep 26 '17 at 11:06
Basile Starynkevitch
7,9231940
answered Sep 26 '17 at 11:06
Basile Starynkevitch
7,9231940
7,9231940
That was my mistake, I though that LD_LIBRARY_PATH is the product of runningldconfig. Meanwhile it is the input of ldconfig alongside with files in/etc/ld.so.conf.
– calavera.info
Sep 26 '17 at 11:13
1
My feeling is thatldconfigdon't use$LD_LIBRARY_PATH(which is only used atld-linux.sotime)
– Basile Starynkevitch
Sep 26 '17 at 11:15
3
@calavera.info it's neither. The dynamic linker usesLD_LIBRARY_PATHtogether with the output ofldconfigat runtime.ldconfigneither uses nor changesLD_LIBRARY_PATH.
– hobbs
Sep 26 '17 at 19:37
Now I can see that I had it totally messed up, probably by spending too much time in Java, where "classpath" is virtualy the only configuration of dynamic linking. Everything seems to be clear now, thanks a lot.
– calavera.info
Sep 27 '17 at 8:41
add a comment |Â
That was my mistake, I though that LD_LIBRARY_PATH is the product of runningldconfig. Meanwhile it is the input of ldconfig alongside with files in/etc/ld.so.conf.
– calavera.info
Sep 26 '17 at 11:13
1
My feeling is thatldconfigdon't use$LD_LIBRARY_PATH(which is only used atld-linux.sotime)
– Basile Starynkevitch
Sep 26 '17 at 11:15
3
@calavera.info it's neither. The dynamic linker usesLD_LIBRARY_PATHtogether with the output ofldconfigat runtime.ldconfigneither uses nor changesLD_LIBRARY_PATH.
– hobbs
Sep 26 '17 at 19:37
Now I can see that I had it totally messed up, probably by spending too much time in Java, where "classpath" is virtualy the only configuration of dynamic linking. Everything seems to be clear now, thanks a lot.
– calavera.info
Sep 27 '17 at 8:41
That was my mistake, I though that LD_LIBRARY_PATH is the product of running
ldconfig. Meanwhile it is the input of ldconfig alongside with files in /etc/ld.so.conf.– calavera.info
Sep 26 '17 at 11:13
That was my mistake, I though that LD_LIBRARY_PATH is the product of running
ldconfig. Meanwhile it is the input of ldconfig alongside with files in /etc/ld.so.conf.– calavera.info
Sep 26 '17 at 11:13
1
1
My feeling is that
ldconfig don't use $LD_LIBRARY_PATH (which is only used at ld-linux.so time)– Basile Starynkevitch
Sep 26 '17 at 11:15
My feeling is that
ldconfig don't use $LD_LIBRARY_PATH (which is only used at ld-linux.so time)– Basile Starynkevitch
Sep 26 '17 at 11:15
3
3
@calavera.info it's neither. The dynamic linker uses
LD_LIBRARY_PATH together with the output of ldconfig at runtime. ldconfig neither uses nor changes LD_LIBRARY_PATH.– hobbs
Sep 26 '17 at 19:37
@calavera.info it's neither. The dynamic linker uses
LD_LIBRARY_PATH together with the output of ldconfig at runtime. ldconfig neither uses nor changes LD_LIBRARY_PATH.– hobbs
Sep 26 '17 at 19:37
Now I can see that I had it totally messed up, probably by spending too much time in Java, where "classpath" is virtualy the only configuration of dynamic linking. Everything seems to be clear now, thanks a lot.
– calavera.info
Sep 27 '17 at 8:41
Now I can see that I had it totally messed up, probably by spending too much time in Java, where "classpath" is virtualy the only configuration of dynamic linking. Everything seems to be clear now, thanks a lot.
– calavera.info
Sep 27 '17 at 8:41
add a comment |Â
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