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| author | Michael Kerrisk <mtk.manpages@gmail.com> | 2019-07-03 10:06:36 +0200 |
|---|---|---|
| committer | Michael Kerrisk <mtk.manpages@gmail.com> | 2019-07-03 10:06:36 +0200 |
| commit | 58a4ac49d4dbbc295da77807bfaf261642610634 (patch) | |
| tree | 1705be3c67612f366f62a67011de2d255588c947 | |
| parent | 43898de48866c677269c8c1821e2ceb35bc865f6 (diff) | |
| download | man-pages-58a4ac49d4dbbc295da77807bfaf261642610634.tar.gz | |
dlopen.3: Clarify when an executable's symbols can be used for symbol resolution
The --export-dynamic linker option is not the only way that main's
global symbols may end up in the dynamic symbol table and thus be
used to satisfy symbol reference in a shared object. A symbol
may also be placed into the dynamic symbol table if ld(1)
notices a dependency in another object during the static link.
Verified by experiment; see previous commit.
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
| -rw-r--r-- | man3/dlopen.3 | 15 |
1 files changed, 11 insertions, 4 deletions
diff --git a/man3/dlopen.3 b/man3/dlopen.3 index 18801ec5da..fefad1f25a 100644 --- a/man3/dlopen.3 +++ b/man3/dlopen.3 @@ -214,10 +214,17 @@ flag; and definitions in the shared object itself (and any dependencies that were loaded for that object). .PP -If the executable was linked with the flag "\-rdynamic" -(or, synonymously, "\-\-export\-dynamic"), -then global symbols in the executable will also be used -to resolve references in a dynamically loaded shared object. +Any global symbols in the executable that were placed into +its dynamic symbol table by +.BR ld (1) +can also be used to resolve references in a dynamically loaded shared object. +Symbols may be placed in the dynamic symbol table +either because the executable was linked with the flag "\-rdynamic" +(or, synonymously, "\-\-export\-dynamic"), which causes all of +the executable's global symbols to be placed in the dynamic symbol table, +or because +.BR ld (1) +noted a dependency on a symbol in another object during static linking. .PP If the same shared object is opened again with .BR dlopen (), |