https://bugs.llvm.org/show_bug.cgi?id=48696
Bug ID: 48696
Summary: section type conflict with clang, not with gcc
Product: clang
Version: 11.0
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: C++
Assignee: unassignedclangb...@nondot.org
Reporter: balazs.samu.fek...@ericsson.com
CC: blitzrak...@gmail.com, dgre...@apple.com,
erik.pilking...@gmail.com, llvm-bugs@lists.llvm.org,
richard-l...@metafoo.co.uk
Created attachment 24365
--> https://bugs.llvm.org/attachment.cgi?id=24365&action=edit
code to reproduce.
We ran into an issue when adding a section attribute for certain symbols:
[[gnu::section(".bss")]] const int Stuff::xi = rand();
[[gnu::section(".bss")]] std::tr1::unordered_map<int,int> uom;
Full example code attached.
error I get when compiling:
$ clang++ -O2 -pipe -g -fno-omit-frame-pointer -std=c++11 main.cc stuff.cc
stuff.cc:8:59: error: 'uom' causes a section type conflict with 'xi'
[[gnu::section(".bss")]] std::tr1::unordered_map<int,int> uom;
^
stuff.cc:6:43: note: declared here
[[gnu::section(".bss")]] const int Stuff::xi = rand();
^
1 error generated.
Compiled without the section attributes result is that they are both put in
.bss, but when explicitly defining them, clang++ throws a section type
conflict.
Tried both with llvm 8.0 and 12.0. Also tried with
-fno-zero-initialized-in-bss, in that case they were put in .data, but I got
the same error when I added the attribute.
The same code compiles and runs with g++ (tried with versions 5.4.0 and 7.5.0).
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