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| author | Nick Clifton <nickc@redhat.com> | 2018-02-03 13:11:35 +0000 |
|---|---|---|
| committer | Nick Clifton <nickc@redhat.com> | 2018-02-03 13:11:35 +0000 |
| commit | b0daac83d78c82f7998287bb717063c4d01d4f97 (patch) | |
| tree | 2beb203c407b3a1225e23ceb23cb401fbee24a31 /ld/scripttempl | |
| parent | 138a158f0a561d406bebb8b91eba0dd6dedd430e (diff) | |
| download | gdb-b0daac83d78c82f7998287bb717063c4d01d4f97.zip gdb-b0daac83d78c82f7998287bb717063c4d01d4f97.tar.gz gdb-b0daac83d78c82f7998287bb717063c4d01d4f97.tar.bz2 | |
Remove PROVIDE() qualifiers from definition of __CTOR_LIST__ and __DTOR_LIST__ symbols in PE linker scripts.
PR 22762
* scripttempl/pe.sc: Remove PROVIDE()s from __CTOR_LIST__ and
__DTOR_LIST__ symbols. Add a comment explaining why this is
necessary.
* scripttemp/pep.sc: Likewise.
* ld.texinfo (PROVIDE): Add a note about the effect of common
symbols.
Diffstat (limited to 'ld/scripttempl')
| -rw-r--r-- | ld/scripttempl/pe.sc | 24 | ||||
| -rw-r--r-- | ld/scripttempl/pep.sc | 24 |
2 files changed, 40 insertions, 8 deletions
diff --git a/ld/scripttempl/pe.sc b/ld/scripttempl/pe.sc index c8a45ca..f56d783 100644 --- a/ld/scripttempl/pe.sc +++ b/ld/scripttempl/pe.sc @@ -98,8 +98,22 @@ SECTIONS ${RELOCATING+*(.glue_7t)} ${RELOCATING+*(.glue_7)} ${CONSTRUCTING+ - PROVIDE(___CTOR_LIST__ = .); - PROVIDE(__CTOR_LIST__ = .); + /* Note: we always define __CTOR_LIST__ and ___CTOR_LIST__ here, + we do not PROVIDE them. This is because the ctors.o startup + code in libgcc defines them as common symbols, with the + expectation that they will be overridden by the definitions + here. If we PROVIDE the symbols then they will not be + overridden and global constructors will not be run. + + This does mean that it is not possible for a user to define + their own __CTOR_LIST__ and __DTOR_LIST__ symbols. If that + ability is needed a custom linker script will have to be + used. (The custom script can just be a copy of this script + with the PROVIDE() qualifiers added). + + See PR 22762 for more details. */ + ___CTOR_LIST__ = .; + __CTOR_LIST__ = .; LONG (-1); KEEP(*(.ctors)); KEEP(*(.ctor)); @@ -107,8 +121,10 @@ SECTIONS LONG (0); } ${CONSTRUCTING+ - PROVIDE(___DTOR_LIST__ = .); - PROVIDE(__DTOR_LIST__ = .); + /* See comment about __CTOR_LIST__ above. The same reasoning + applies here too. */ + ___DTOR_LIST__ = .; + __DTOR_LIST__ = .; LONG (-1); KEEP(*(.dtors)); KEEP(*(.dtor)); diff --git a/ld/scripttempl/pep.sc b/ld/scripttempl/pep.sc index 8daacb2..3c6c84d 100644 --- a/ld/scripttempl/pep.sc +++ b/ld/scripttempl/pep.sc @@ -99,8 +99,22 @@ SECTIONS ${RELOCATING+*(.glue_7)} ${CONSTRUCTING+. = ALIGN(8);} ${CONSTRUCTING+ - PROVIDE(___CTOR_LIST__ = .); - PROVIDE(__CTOR_LIST__ = .); + /* Note: we always define __CTOR_LIST__ and ___CTOR_LIST__ here, + we do not PROVIDE them. This is because the ctors.o startup + code in libgcc defines them as common symbols, with the + expectation that they will be overridden by the definitions + here. If we PROVIDE the symbols then they will not be + overridden and global constructors will not be run. + + This does mean that it is not possible for a user to define + their own __CTOR_LIST__ and __DTOR_LIST__ symbols. If that + ability is needed a custom linker script will have to be + used. (The custom script can just be a copy of this script + with the PROVIDE() qualifiers added). + + See PR 22762 for more details. */ + ___CTOR_LIST__ = .; + __CTOR_LIST__ = .; LONG (-1); LONG (-1); KEEP (*(.ctors)); KEEP (*(.ctor)); @@ -108,8 +122,10 @@ SECTIONS LONG (0); LONG (0); } ${CONSTRUCTING+ - PROVIDE(___DTOR_LIST__ = .); - PROVIDE(__DTOR_LIST__ = .); + /* See comment about __CTOR_LIST__ above. The same reasoning + applies here too. */ + ___DTOR_LIST__ = .; + __DTOR_LIST__ = .; LONG (-1); LONG (-1); KEEP (*(.dtors)); KEEP (*(.dtor)); |