[llvm-bugs] [Bug 37779] New: RTLD_LAZY does not work if compiled with clang
via llvm-bugs
llvm-bugs at lists.llvm.org
Tue Jun 12 04:19:45 PDT 2018
https://bugs.llvm.org/show_bug.cgi?id=37779
Bug ID: 37779
Summary: RTLD_LAZY does not work if compiled with clang
Product: clang
Version: 6.0
Hardware: Other
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Driver
Assignee: unassignedclangbugs at nondot.org
Reporter: tom.ty89 at gmail.com
CC: llvm-bugs at lists.llvm.org
Created attachment 20421
--> https://bugs.llvm.org/attachment.cgi?id=20421&action=edit
Example
Supposedly with RTLD_LAZY, symbols will only be resolved as the code references
them are executed. However, when compiled with clang, undefined symbols are
being resolved before dlopen() returns, as if RTLD_NOW is used.
Here's the difference when the attached example is compiled with gcc and clang
respectively:
$ make
cc -shared libshared.c -o libshared.so
cc -shared libplugin.c -o libplugin.so
cc main.c -ldl -o executable
$ ./executable
plugin: value = 42
$ make clean
rm -f executable libshared.so libplugin.so
$ make CC=clang
clang -shared libshared.c -o libshared.so
clang -shared libplugin.c -o libplugin.so
clang main.c -ldl -o executable
$ ./executable
dlopen failed: ./libplugin.so: undefined symbol: libshared_get_value
$
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