LD_PRELOAD multiple interdependent libraries

I Have Libraries with a tree of dependencies, i.e. some of the dependencies have other dependencies I want to Preload. How can I do this?

LD_PRELOAD 
/opt/yocto/2.5.1/sysroots/core2-64-poky-linux/usr/lib/libicudata.so.60 
/opt/yocto/2.5.1/sysroots/core2-64-poky-linux/usr/lib/libicuuc.so.60 
/opt/yocto/2.5.1/sysroots/core2-64-poky-linux/usr/lib/libicui18n.so.60 
/opt/yocto/2.5.1/sysroots/core2-64-poky-linux/usr/lib/libQt5Core.so.5 
MyApp

The LD_PRELOAD call contains is sorted, such that the dependencies are listed before the depending library.

The Linker throws the following error:

ERROR: ld.so: object '/opt/yocto/2.5.1/sysroots/core2-64-poky-linux/usr/lib/libQt5Core.so.5' from LD_PRELOAD cannot be preloaded (cannot open shared object file): ignored.

Can the libraries be preloaded to fulfil the dependencies in the correct order?

asked Nov 15 '18 at 16:15

danba

512827

add a comment |

I Have Libraries with a tree of dependencies, i.e. some of the dependencies have other dependencies I want to Preload. How can I do this?

LD_PRELOAD 
/opt/yocto/2.5.1/sysroots/core2-64-poky-linux/usr/lib/libicudata.so.60 
/opt/yocto/2.5.1/sysroots/core2-64-poky-linux/usr/lib/libicuuc.so.60 
/opt/yocto/2.5.1/sysroots/core2-64-poky-linux/usr/lib/libicui18n.so.60 
/opt/yocto/2.5.1/sysroots/core2-64-poky-linux/usr/lib/libQt5Core.so.5 
MyApp

The LD_PRELOAD call contains is sorted, such that the dependencies are listed before the depending library.

The Linker throws the following error:

ERROR: ld.so: object '/opt/yocto/2.5.1/sysroots/core2-64-poky-linux/usr/lib/libQt5Core.so.5' from LD_PRELOAD cannot be preloaded (cannot open shared object file): ignored.

Can the libraries be preloaded to fulfil the dependencies in the correct order?

asked Nov 15 '18 at 16:15

danba

512827

add a comment |

I Have Libraries with a tree of dependencies, i.e. some of the dependencies have other dependencies I want to Preload. How can I do this?

LD_PRELOAD 
/opt/yocto/2.5.1/sysroots/core2-64-poky-linux/usr/lib/libicudata.so.60 
/opt/yocto/2.5.1/sysroots/core2-64-poky-linux/usr/lib/libicuuc.so.60 
/opt/yocto/2.5.1/sysroots/core2-64-poky-linux/usr/lib/libicui18n.so.60 
/opt/yocto/2.5.1/sysroots/core2-64-poky-linux/usr/lib/libQt5Core.so.5 
MyApp

The LD_PRELOAD call contains is sorted, such that the dependencies are listed before the depending library.

The Linker throws the following error:

ERROR: ld.so: object '/opt/yocto/2.5.1/sysroots/core2-64-poky-linux/usr/lib/libQt5Core.so.5' from LD_PRELOAD cannot be preloaded (cannot open shared object file): ignored.

Can the libraries be preloaded to fulfil the dependencies in the correct order?

asked Nov 15 '18 at 16:15

danba

512827

I Have Libraries with a tree of dependencies, i.e. some of the dependencies have other dependencies I want to Preload. How can I do this?

LD_PRELOAD 
/opt/yocto/2.5.1/sysroots/core2-64-poky-linux/usr/lib/libicudata.so.60 
/opt/yocto/2.5.1/sysroots/core2-64-poky-linux/usr/lib/libicuuc.so.60 
/opt/yocto/2.5.1/sysroots/core2-64-poky-linux/usr/lib/libicui18n.so.60 
/opt/yocto/2.5.1/sysroots/core2-64-poky-linux/usr/lib/libQt5Core.so.5 
MyApp

The LD_PRELOAD call contains is sorted, such that the dependencies are listed before the depending library.

The Linker throws the following error:

ERROR: ld.so: object '/opt/yocto/2.5.1/sysroots/core2-64-poky-linux/usr/lib/libQt5Core.so.5' from LD_PRELOAD cannot be preloaded (cannot open shared object file): ignored.

Can the libraries be preloaded to fulfil the dependencies in the correct order?

shared-libraries ld dynamic-library ld-preload

asked Nov 15 '18 at 16:15

danba

512827

asked Nov 15 '18 at 16:15

danba

512827

asked Nov 15 '18 at 16:15

danba

512827

asked Nov 15 '18 at 16:15

danba

512827

asked Nov 15 '18 at 16:15

danba

512827

add a comment |

1 Answer
1

active

oldest

votes

This error:

ld.so: object '/opt/yocto/2.5.1/sysroots/core2-64-poky-linux/usr/lib/libQt5Core.so.5' 
from LD_PRELOAD cannot be preloaded (cannot open shared object file): ignored.

means that the dynamic loader tried to open the library and failed.

There are several possible reasons for this failure:

The file doesn't exist (use ls -L /opt/yocto/2.5.1/sysroots/core2-64-poky-linux/usr/lib/libQt5Core.so.5 to confirm that it does

The file is for the wrong architecture (e.g. 32-bit ELF when MyApp is 64-bit, or vice versa). Use file MyApp and file libQt5Core.so.5 to confirm that they match.

Something else. Perhaps MyApp was linked with newlib or uClibc, but libQt5Core.so.5 was built with GLIBC (or vice versa).

answered Nov 16 '18 at 5:34

Employed Russian

127k20173239

In my case the library can't be preloaded because it itself requires a dynamic library which is "not found" in the LD_LIBRARY_PATH. Unfortunate I can't change the LD_LIBRARY_PATH to include the dependencies.

– danba
Nov 16 '18 at 6:12

@danba I am confused: if you know the reason libQt5Core is not loading, why didn't you say so, and why don't you add whatever library it requires to the LD_PRELOAD list?

– Employed Russian
Nov 16 '18 at 6:45

I was trying to explain that the shared Library is missing dependencies in the question. The LD_PRELOAD list in the question does contain all dependencies, they're just not interpreted correctly it seems.

– danba
Nov 16 '18 at 6:58

@danba Your theory of why this doesn't work is probably incorrect. How do you know that "the library can't be preloaded because it itself requires a dynamic library which is "not found"" ? Setting LD_DEBUG=files,libs could provide additional info.

– Employed Russian
Nov 16 '18 at 15:06

Thanks for the LD_DEBUG=files,libs suggestion. It turns out the environment was dirty on that machine. Your answer, by the way, summarizes possible issues nicely.

– danba
Nov 19 '18 at 13:13

add a comment |

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1 Answer
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1 Answer
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active

oldest

votes

This error:

ld.so: object '/opt/yocto/2.5.1/sysroots/core2-64-poky-linux/usr/lib/libQt5Core.so.5' 
from LD_PRELOAD cannot be preloaded (cannot open shared object file): ignored.

means that the dynamic loader tried to open the library and failed.

There are several possible reasons for this failure:

The file doesn't exist (use ls -L /opt/yocto/2.5.1/sysroots/core2-64-poky-linux/usr/lib/libQt5Core.so.5 to confirm that it does

The file is for the wrong architecture (e.g. 32-bit ELF when MyApp is 64-bit, or vice versa). Use file MyApp and file libQt5Core.so.5 to confirm that they match.

Something else. Perhaps MyApp was linked with newlib or uClibc, but libQt5Core.so.5 was built with GLIBC (or vice versa).

answered Nov 16 '18 at 5:34

Employed Russian

127k20173239

In my case the library can't be preloaded because it itself requires a dynamic library which is "not found" in the LD_LIBRARY_PATH. Unfortunate I can't change the LD_LIBRARY_PATH to include the dependencies.

– danba
Nov 16 '18 at 6:12

@danba I am confused: if you know the reason libQt5Core is not loading, why didn't you say so, and why don't you add whatever library it requires to the LD_PRELOAD list?

– Employed Russian
Nov 16 '18 at 6:45

I was trying to explain that the shared Library is missing dependencies in the question. The LD_PRELOAD list in the question does contain all dependencies, they're just not interpreted correctly it seems.

– danba
Nov 16 '18 at 6:58

@danba Your theory of why this doesn't work is probably incorrect. How do you know that "the library can't be preloaded because it itself requires a dynamic library which is "not found"" ? Setting LD_DEBUG=files,libs could provide additional info.

– Employed Russian
Nov 16 '18 at 15:06

Thanks for the LD_DEBUG=files,libs suggestion. It turns out the environment was dirty on that machine. Your answer, by the way, summarizes possible issues nicely.

– danba
Nov 19 '18 at 13:13

add a comment |

This error:

ld.so: object '/opt/yocto/2.5.1/sysroots/core2-64-poky-linux/usr/lib/libQt5Core.so.5' 
from LD_PRELOAD cannot be preloaded (cannot open shared object file): ignored.

means that the dynamic loader tried to open the library and failed.

There are several possible reasons for this failure:

The file doesn't exist (use ls -L /opt/yocto/2.5.1/sysroots/core2-64-poky-linux/usr/lib/libQt5Core.so.5 to confirm that it does

The file is for the wrong architecture (e.g. 32-bit ELF when MyApp is 64-bit, or vice versa). Use file MyApp and file libQt5Core.so.5 to confirm that they match.

Something else. Perhaps MyApp was linked with newlib or uClibc, but libQt5Core.so.5 was built with GLIBC (or vice versa).

answered Nov 16 '18 at 5:34

Employed Russian

127k20173239

In my case the library can't be preloaded because it itself requires a dynamic library which is "not found" in the LD_LIBRARY_PATH. Unfortunate I can't change the LD_LIBRARY_PATH to include the dependencies.

– danba
Nov 16 '18 at 6:12

@danba I am confused: if you know the reason libQt5Core is not loading, why didn't you say so, and why don't you add whatever library it requires to the LD_PRELOAD list?

– Employed Russian
Nov 16 '18 at 6:45

I was trying to explain that the shared Library is missing dependencies in the question. The LD_PRELOAD list in the question does contain all dependencies, they're just not interpreted correctly it seems.

– danba
Nov 16 '18 at 6:58

@danba Your theory of why this doesn't work is probably incorrect. How do you know that "the library can't be preloaded because it itself requires a dynamic library which is "not found"" ? Setting LD_DEBUG=files,libs could provide additional info.

– Employed Russian
Nov 16 '18 at 15:06

Thanks for the LD_DEBUG=files,libs suggestion. It turns out the environment was dirty on that machine. Your answer, by the way, summarizes possible issues nicely.

– danba
Nov 19 '18 at 13:13

add a comment |

This error:

ld.so: object '/opt/yocto/2.5.1/sysroots/core2-64-poky-linux/usr/lib/libQt5Core.so.5' 
from LD_PRELOAD cannot be preloaded (cannot open shared object file): ignored.

means that the dynamic loader tried to open the library and failed.

There are several possible reasons for this failure:

The file doesn't exist (use ls -L /opt/yocto/2.5.1/sysroots/core2-64-poky-linux/usr/lib/libQt5Core.so.5 to confirm that it does

The file is for the wrong architecture (e.g. 32-bit ELF when MyApp is 64-bit, or vice versa). Use file MyApp and file libQt5Core.so.5 to confirm that they match.

Something else. Perhaps MyApp was linked with newlib or uClibc, but libQt5Core.so.5 was built with GLIBC (or vice versa).

answered Nov 16 '18 at 5:34

Employed Russian

127k20173239

This error:

ld.so: object '/opt/yocto/2.5.1/sysroots/core2-64-poky-linux/usr/lib/libQt5Core.so.5' 
from LD_PRELOAD cannot be preloaded (cannot open shared object file): ignored.

means that the dynamic loader tried to open the library and failed.

There are several possible reasons for this failure:

The file doesn't exist (use ls -L /opt/yocto/2.5.1/sysroots/core2-64-poky-linux/usr/lib/libQt5Core.so.5 to confirm that it does

The file is for the wrong architecture (e.g. 32-bit ELF when MyApp is 64-bit, or vice versa). Use file MyApp and file libQt5Core.so.5 to confirm that they match.

Something else. Perhaps MyApp was linked with newlib or uClibc, but libQt5Core.so.5 was built with GLIBC (or vice versa).

answered Nov 16 '18 at 5:34

Employed Russian

127k20173239

answered Nov 16 '18 at 5:34

Employed Russian

127k20173239

answered Nov 16 '18 at 5:34

Employed Russian

127k20173239

answered Nov 16 '18 at 5:34

Employed Russian

127k20173239

In my case the library can't be preloaded because it itself requires a dynamic library which is "not found" in the LD_LIBRARY_PATH. Unfortunate I can't change the LD_LIBRARY_PATH to include the dependencies.

– danba
Nov 16 '18 at 6:12

@danba I am confused: if you know the reason libQt5Core is not loading, why didn't you say so, and why don't you add whatever library it requires to the LD_PRELOAD list?

– Employed Russian
Nov 16 '18 at 6:45

I was trying to explain that the shared Library is missing dependencies in the question. The LD_PRELOAD list in the question does contain all dependencies, they're just not interpreted correctly it seems.

– danba
Nov 16 '18 at 6:58

@danba Your theory of why this doesn't work is probably incorrect. How do you know that "the library can't be preloaded because it itself requires a dynamic library which is "not found"" ? Setting LD_DEBUG=files,libs could provide additional info.

– Employed Russian
Nov 16 '18 at 15:06

Thanks for the LD_DEBUG=files,libs suggestion. It turns out the environment was dirty on that machine. Your answer, by the way, summarizes possible issues nicely.

– danba
Nov 19 '18 at 13:13

add a comment |

In my case the library can't be preloaded because it itself requires a dynamic library which is "not found" in the LD_LIBRARY_PATH. Unfortunate I can't change the LD_LIBRARY_PATH to include the dependencies.

– danba
Nov 16 '18 at 6:12

@danba I am confused: if you know the reason libQt5Core is not loading, why didn't you say so, and why don't you add whatever library it requires to the LD_PRELOAD list?

– Employed Russian
Nov 16 '18 at 6:45

I was trying to explain that the shared Library is missing dependencies in the question. The LD_PRELOAD list in the question does contain all dependencies, they're just not interpreted correctly it seems.

– danba
Nov 16 '18 at 6:58

@danba Your theory of why this doesn't work is probably incorrect. How do you know that "the library can't be preloaded because it itself requires a dynamic library which is "not found"" ? Setting LD_DEBUG=files,libs could provide additional info.

– Employed Russian
Nov 16 '18 at 15:06

Thanks for the LD_DEBUG=files,libs suggestion. It turns out the environment was dirty on that machine. Your answer, by the way, summarizes possible issues nicely.

– danba
Nov 19 '18 at 13:13

In my case the library can't be preloaded because it itself requires a dynamic library which is "not found" in the LD_LIBRARY_PATH. Unfortunate I can't change the LD_LIBRARY_PATH to include the dependencies.

– danba
Nov 16 '18 at 6:12

@danba I am confused: if you know the reason libQt5Core is not loading, why didn't you say so, and why don't you add whatever library it requires to the LD_PRELOAD list?

– Employed Russian
Nov 16 '18 at 6:45

I was trying to explain that the shared Library is missing dependencies in the question. The LD_PRELOAD list in the question does contain all dependencies, they're just not interpreted correctly it seems.

– danba
Nov 16 '18 at 6:58

@danba Your theory of why this doesn't work is probably incorrect. How do you know that "the library can't be preloaded because it itself requires a dynamic library which is "not found"" ? Setting LD_DEBUG=files,libs could provide additional info.

– Employed Russian
Nov 16 '18 at 15:06

Thanks for the LD_DEBUG=files,libs suggestion. It turns out the environment was dirty on that machine. Your answer, by the way, summarizes possible issues nicely.

– danba
Nov 19 '18 at 13:13

add a comment |

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