[Bug gold/21066] New: icf folds template functions with different exception handling semantics

[gandhi.shaheen at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=21066

            Bug ID: 21066
           Summary: icf folds template functions with different exception
                    handling semantics
           Product: binutils
           Version: 2.24
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gold
          Assignee: ccoutant at gmail dot com
          Reporter: gandhi.shaheen at gmail dot com
                CC: ian at airs dot com
  Target Milestone: ---

Created attachment 9763
  --> https://sourceware.org/bugzilla/attachment.cgi?id=9763&action=edit
example source code

compiling the attached file with either g++ or clang++ and then linking with
gold with --icf=safe will fold the two template functions into one, whereas
using the standard linker will produce the correct output.

> g++ -std=c++14 -o test main.cpp -v

Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/4.9/lto-wrapper
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu
4.9.4-2ubuntu1~14.04.1' --with-bugurl=file:///usr/share/doc/gcc-4.9/README.Bugs
--enable-languages=c,c++,java,go,d,fortran,objc,obj-c++ --prefix=/usr
--program-suffix=-4.9 --enable-shared --enable-linker-build-id
--libexecdir=/usr/lib --without-included-gettext --enable-threads=posix
--with-gxx-include-dir=/usr/include/c++/4.9 --libdir=/usr/lib --enable-nls
--with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug
--enable-libstdcxx-time=yes --enable-gnu-unique-object --disable-vtable-verify
--enable-plugin --with-system-zlib --disable-browser-plugin
--enable-java-awt=gtk --enable-gtk-cairo
--with-java-home=/usr/lib/jvm/java-1.5.0-gcj-4.9-amd64/jre --enable-java-home
--with-jvm-root-dir=/usr/lib/jvm/java-1.5.0-gcj-4.9-amd64
--with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-4.9-amd64
--with-arch-directory=amd64 --with-ecj-jar=/usr/share/java/eclipse-ecj.jar
--enable-objc-gc --enable-multiarch --disable-werror --with-arch-32=i686
--with-abi=m64 --with-multilib-list=m32,m64,mx32 --enable-multilib
--with-tune=generic --enable-checking=release --build=x86_64-linux-gnu
--host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
gcc version 4.9.4 (Ubuntu 4.9.4-2ubuntu1~14.04.1) 
COLLECT_GCC_OPTIONS='-std=c++1y' '-o' 'test' '-v' '-shared-libgcc'
'-mtune=generic' '-march=x86-64'
 /usr/lib/gcc/x86_64-linux-gnu/4.9/cc1plus -quiet -v -imultiarch
x86_64-linux-gnu -D_GNU_SOURCE main.cpp -quiet -dumpbase main.cpp
-mtune=generic -march=x86-64 -auxbase main -std=c++1y -version
-fstack-protector -Wformat -Wformat-security -o /tmp/user/1000/ccgCMiPR.s
GNU C++ (Ubuntu 4.9.4-2ubuntu1~14.04.1) version 4.9.4 (x86_64-linux-gnu)
        compiled by GNU C version 4.9.4, GMP version 5.1.3, MPFR version 3.1.3,
MPC version 1.0.1
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
ignoring duplicate directory "/usr/include/x86_64-linux-gnu/c++/4.9"
ignoring nonexistent directory "/usr/local/include/x86_64-linux-gnu"
ignoring nonexistent directory
"/usr/lib/gcc/x86_64-linux-gnu/4.9/../../../../x86_64-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/include/c++/4.9
 /usr/include/x86_64-linux-gnu/c++/4.9
 /usr/include/c++/4.9/backward
 /usr/lib/gcc/x86_64-linux-gnu/4.9/include
 /usr/local/include
 /usr/lib/gcc/x86_64-linux-gnu/4.9/include-fixed
 /usr/include/x86_64-linux-gnu
 /usr/include
End of search list.
GNU C++ (Ubuntu 4.9.4-2ubuntu1~14.04.1) version 4.9.4 (x86_64-linux-gnu)
        compiled by GNU C version 4.9.4, GMP version 5.1.3, MPFR version 3.1.3,
MPC version 1.0.1
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: e7137bb4cc46fb63f5e22418eff966b7
COLLECT_GCC_OPTIONS='-std=c++1y' '-o' 'test' '-v' '-shared-libgcc'
'-mtune=generic' '-march=x86-64'
 as -v --64 -o /tmp/user/1000/cc7eBpBQ.o /tmp/user/1000/ccgCMiPR.s
GNU assembler version 2.24 (x86_64-linux-gnu) using BFD version (GNU Binutils
for Ubuntu) 2.24
COMPILER_PATH=/usr/lib/gcc/x86_64-linux-gnu/4.9/:/usr/lib/gcc/x86_64-linux-gnu/4.9/:/usr/lib/gcc/x86_64-linux-gnu/:/usr/lib/gcc/x86_64-linux-gnu/4.9/:/usr/lib/gcc/x86_64-linux-gnu/
LIBRARY_PATH=/usr/lib/gcc/x86_64-linux-gnu/4.9/:/usr/lib/gcc/x86_64-linux-gnu/4.9/../../../x86_64-linux-gnu/:/usr/lib/gcc/x86_64-linux-gnu/4.9/../../../../lib/:/lib/x86_64-linux-gnu/:/lib/../lib/:/usr/lib/x86_64-linux-gnu/:/usr/lib/../lib/:/usr/lib/gcc/x86_64-linux-gnu/4.9/../../../:/lib/:/usr/lib/
COLLECT_GCC_OPTIONS='-std=c++1y' '-o' 'test' '-v' '-shared-libgcc'
'-mtune=generic' '-march=x86-64'
 /usr/lib/gcc/x86_64-linux-gnu/4.9/collect2 -plugin
/usr/lib/gcc/x86_64-linux-gnu/4.9/liblto_plugin.so
-plugin-opt=/usr/lib/gcc/x86_64-linux-gnu/4.9/lto-wrapper
-plugin-opt=-fresolution=/tmp/user/1000/ccAUZIoP.res
-plugin-opt=-pass-through=-lgcc_s -plugin-opt=-pass-through=-lgcc
-plugin-opt=-pass-through=-lc -plugin-opt=-pass-through=-lgcc_s
-plugin-opt=-pass-through=-lgcc --sysroot=/ --build-id --eh-frame-hdr -m
elf_x86_64 --hash-style=gnu --as-needed -dynamic-linker
/lib64/ld-linux-x86-64.so.2 -z relro -o test
/usr/lib/gcc/x86_64-linux-gnu/4.9/../../../x86_64-linux-gnu/crt1.o
/usr/lib/gcc/x86_64-linux-gnu/4.9/../../../x86_64-linux-gnu/crti.o
/usr/lib/gcc/x86_64-linux-gnu/4.9/crtbegin.o
-L/usr/lib/gcc/x86_64-linux-gnu/4.9
-L/usr/lib/gcc/x86_64-linux-gnu/4.9/../../../x86_64-linux-gnu
-L/usr/lib/gcc/x86_64-linux-gnu/4.9/../../../../lib -L/lib/x86_64-linux-gnu
-L/lib/../lib -L/usr/lib/x86_64-linux-gnu -L/usr/lib/../lib
-L/usr/lib/gcc/x86_64-linux-gnu/4.9/../../.. /tmp/user/1000/cc7eBpBQ.o -lstdc++
-lm -lgcc_s -lgcc -lc -lgcc_s -lgcc /usr/lib/gcc/x86_64-linux-gnu/4.9/crtend.o
/usr/lib/gcc/x86_64-linux-gnu/4.9/../../../x86_64-linux-gnu/crtn.o


> ./test
caught expected exception
caught expected exception

> g++ -std=c++14 -c -o main.o main.cpp   
> "../binutils-2.27.90/gold/ld-new" "--sysroot=/" "--build-id" "--eh-frame-hdr" 
> "-m" "elf_x86_64" "--hash-style=gnu" "--as-needed" "-dynamic-linker" 
> "/lib64/ld-linux-x86-64.so.2" "-z" "relro" "-o" "test" 
> "/usr/lib/gcc/x86_64-linux-gnu/4.9/../../../x86_64-linux-gnu/crt1.o" 
> "/usr/lib/gcc/x86_64-linux-gnu/4.9/../../../x86_64-linux-gnu/crti.o" 
> "/usr/lib/gcc/x86_64-linux-gnu/4.9/crtbegin.o" 
> "-L/usr/lib/gcc/x86_64-linux-gnu/4.9" 
> "-L/usr/lib/gcc/x86_64-linux-gnu/4.9/../../../x86_64-linux-gnu" 
> "-L/usr/lib/gcc/x86_64-linux-gnu/4.9/../../../../lib" 
> "-L/lib/x86_64-linux-gnu" "-L/lib/../lib" "-L/usr/lib/x86_64-linux-gnu" 
> "-L/usr/lib/../lib" "-L/usr/lib/gcc/x86_64-linux-gnu/4.9/../../.." "main.o" 
> "--icf=safe" "-lstdc++" "-lm" "-lgcc_s" "-lgcc" "-lc" "-lgcc_s" "-lgcc" 
> "/usr/lib/gcc/x86_64-linux-gnu/4.9/crtend.o" 
> "/usr/lib/gcc/x86_64-linux-gnu/4.9/../../../x86_64-linux-gnu/crtn.o"

> ./test
caught expected exception
ERROR: caught unexpected exception
terminate called after throwing an instance of 'second_exception'
[3]    11748 abort (core dumped)  ./test

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