Version: 2.31 (HEAD)
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: ld
Assignee: unassigned at sourceware dot org
Reporter: zenith432 at users dot sourceforge.net
Target Milestone: ---
Test Case:
test.c
: P2
Component: binutils
Assignee: unassigned at sourceware dot org
Reporter: zenith432 at users dot sourceforge.net
Target Milestone: ---
There are 3 utilities that dump the symbol table of object files
objdump
readelf
nm
Of these, objdump and readelf can display
https://sourceware.org/bugzilla/show_bug.cgi?id=23306
--- Comment #2 from zenith432 at users dot sourceforge.net ---
Created attachment 11079
--> https://sourceware.org/bugzilla/attachment.cgi?id=11079=edit
apple_nm.c and llvm-nm.cpp
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https://sourceware.org/bugzilla/show_bug.cgi?id=23306
--- Comment #3 from zenith432 at users dot sourceforge.net ---
I'm not sure whether it's based on a formal specification, but here are two
source files
apple_nm.c
Taken from Apple's open source. The function print_mach_symbols does the -m
https://sourceware.org/bugzilla/show_bug.cgi?id=23309
--- Comment #2 from zenith432 at users dot sourceforge.net ---
So here's what's going...
In ld/plugin.c (ld.bfd)... the following code in get_symbols_v2
=
if (res == LDPR_PREVAILING_DEF_IRONLY)
{
/* We need to know
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--- Comment #2 from zenith432 at users dot sourceforge.net ---
Created attachment 11052
--> https://sourceware.org/bugzilla/attachment.cgi?id=11052=edit
code to reproduce error
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Product: binutils
Version: 2.31 (HEAD)
Status: UNCONFIRMED
Severity: critical
Priority: P2
Component: ld
Assignee: unassigned at sourceware dot org
Reporter: zenith432 at users dot sourceforge.net
Target Milestone: ---
When
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--- Comment #3 from zenith432 at users dot sourceforge.net ---
- Your attached patch fixes the problem.
- For the record, I did a workaround with the patch
--- orig_plugin.c 2018-01-13 13:31:16.0 +
+++ plugin.c
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--- Comment #3 from zenith432 at users dot sourceforge.net ---
Created attachment 11088
--> https://sourceware.org/bugzilla/attachment.cgi?id=11088=edit
Proposed patch
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Severity: critical
Priority: P2
Component: ld
Assignee: unassigned at sourceware dot org
Reporter: zenith432 at users dot sourceforge.net
CC: hjl.tools at gmail dot com
Target Milestone: 2.31
== main.c
#include
int a = 5;
int* f(void
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--- Comment #1 from zenith432 at users dot sourceforge.net ---
It appears this issue has been around longer - since the commit that this bit
was introduced
http://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;a=commitdiff;h
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--- Comment #4 from zenith432 at users dot sourceforge.net ---
FYI
I took a look at the code for GCC 8.2 plugin and LLVM 6.0.1 gold plugin.
As best as I can tell
- Neither plugins access the file through the descriptor passed
https://sourceware.org/bugzilla/show_bug.cgi?id=23460
--- Comment #3 from zenith432 at users dot sourceforge.net ---
This patch should fix it
= Begin Patch
diff --git a/bfd/plugin.c b/bfd/plugin.c
index 7c5bba22..98c79c87 100644
--- a/bfd/plugin.c
+++ b/bfd/plugin.c
@@ -209,8 +209,7
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--- Comment #5 from zenith432 at users dot sourceforge.net ---
Correction:
After another review, I noticed that the gcc plugin does NOT free the syms
array passed to add_symbols() during cleanup_hook(). This array is freed
during
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--- Comment #15 from zenith432 at users dot sourceforge.net ---
(In reply to Evangelos Foutras from comment #14)
> I believe the above error is caused by a sequence of "dlopen -> dlclose ->
> dlopen" on LLVMgold.so. (li
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--- Comment #20 from zenith432 at users dot sourceforge.net ---
It's not just repetitive calls to dlopen() on the same plugin.
It is also repetitive calls to onload() on the same plugin. This isn't
supported by the plugin API. Today
https://sourceware.org/bugzilla/show_bug.cgi?id=23460
--- Comment #23 from zenith432 at users dot sourceforge.net ---
(In reply to Nick Clifton from comment #22)
> I am confused by this part of the patch:
>
> for (plugin_list_iter = plugin_list;
>plugin_list_
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https://sourceware.org/bugzilla/show_bug.cgi?id=23424
--- Comment #5 from zenith432 at users dot sourceforge.net ---
This can be silenced with CXXFLAGS="-std=c++11 -Wno-c++11-narrowing", but
should probably be reported separately as a bug. The enum in namespace elfcpp
ends up h
https://sourceware.org/bugzilla/show_bug.cgi?id=23411
--- Comment #4 from zenith432 at users dot sourceforge.net ---
There's an ambiguity in ANSI C about this. From C11
Section 6.9.2 External object definitions
1 If the declaration of an identifier for an object has file scope
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https://sourceware.org/bugzilla/show_bug.cgi?id=23350
--- Comment #4 from zenith432 at users dot sourceforge.net ---
What difference does it make? This is undefined behavior. It doesn't link
-fno-lto either.
gcc -c main.i && gcc -c lib.i && ar rusc lib.a lib.o
gcc main.o lib.a
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