[Bug c++/67555] New: Emplacement of random numbers in vector displaces other variables (loop counter)

["my.pvt.emailaddress at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67555

            Bug ID: 67555
           Summary: Emplacement of random numbers in vector displaces
                    other variables (loop counter)
           Product: gcc
           Version: 5.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: my.pvt.emailaddress at gmail dot com
  Target Milestone: ---

A template function receives a lambda as parameter. This lambda creates random
numbers and is used to emplace these random variables in a vector in a loop.
The loop counter (int) changes suddenly after the second loop, not incrementing
to 2 like expeced but to 282475250, returning after two iterations. The error
does not appear when I emplace 0.0 (uncommented below). Minimal example as
preprocessed file below.

Preprocessed file in attachment

Output of 'LANG="en_US.utf8" g++ --std=c++14 -Wall -Wextra -v -save-temps
bug.cc':

Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/usr/lib/gcc/i686-pc-linux-gnu/5.2.0/lto-wrapper
Target: i686-pc-linux-gnu
Configured with: /build/gcc/src/gcc-5.2.0/configure --prefix=/usr
--libdir=/usr/lib --libexecdir=/usr/lib --mandir=/usr/share/man
--infodir=/usr/share/info --with-bugurl=https://bugs.archlinux.org/
--enable-languages=c,c++,ada,fortran,go,lto,objc,obj-c++ --enable-shared
--enable-threads=posix --enable-libmpx --with-system-zlib --with-isl
--enable-__cxa_atexit --disable-libunwind-exceptions --enable-clocale=gnu
--disable-libstdcxx-pch --disable-libssp --enable-gnu-unique-object
--enable-linker-build-id --enable-lto --enable-plugin
--enable-install-libiberty --with-linker-hash-style=gnu
--enable-gnu-indirect-function --disable-multilib --disable-werror
--enable-checking=release --with-default-libstdcxx-abi=gcc4-compatible
Thread model: posix
gcc version 5.2.0 (GCC) 
COLLECT_GCC_OPTIONS='-std=c++14' '-Wall' '-Wextra' '-v' '-save-temps'
'-shared-libgcc' '-mtune=generic' '-march=pentiumpro'
 /usr/lib/gcc/i686-pc-linux-gnu/5.2.0/cc1plus -E -quiet -v -D_GNU_SOURCE bug.cc
-mtune=generic -march=pentiumpro -std=c++14 -Wall -Wextra -fpch-preprocess -o
bug.ii
ignoring nonexistent directory
"/usr/lib/gcc/i686-pc-linux-gnu/5.2.0/../../../../i686-pc-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/lib/gcc/i686-pc-linux-gnu/5.2.0/../../../../include/c++/5.2.0

/usr/lib/gcc/i686-pc-linux-gnu/5.2.0/../../../../include/c++/5.2.0/i686-pc-linux-gnu
 /usr/lib/gcc/i686-pc-linux-gnu/5.2.0/../../../../include/c++/5.2.0/backward
 /usr/lib/gcc/i686-pc-linux-gnu/5.2.0/include
 /usr/local/include
 /usr/lib/gcc/i686-pc-linux-gnu/5.2.0/include-fixed
 /usr/include
End of search list.
COLLECT_GCC_OPTIONS='-std=c++14' '-Wall' '-Wextra' '-v' '-save-temps'
'-shared-libgcc' '-mtune=generic' '-march=pentiumpro'
 /usr/lib/gcc/i686-pc-linux-gnu/5.2.0/cc1plus -fpreprocessed bug.ii -quiet
-dumpbase bug.cc -mtune=generic -march=pentiumpro -auxbase bug -Wall -Wextra
-std=c++14 -version -o bug.s
GNU C++14 (GCC) version 5.2.0 (i686-pc-linux-gnu)
        compiled by GNU C version 5.2.0, GMP version 6.0.0, MPFR version
3.1.3-p4, MPC version 1.0.3
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
GNU C++14 (GCC) version 5.2.0 (i686-pc-linux-gnu)
        compiled by GNU C version 5.2.0, GMP version 6.0.0, MPFR version
3.1.3-p4, MPC version 1.0.3
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: 96ebd866b991a3692b342321700b9e9b
COLLECT_GCC_OPTIONS='-std=c++14' '-Wall' '-Wextra' '-v' '-save-temps'
'-shared-libgcc' '-mtune=generic' '-march=pentiumpro'
 as -v --32 -o bug.o bug.s
GNU assembler version 2.25.1 (i686-pc-linux-gnu) using BFD version (GNU
Binutils) 2.25.1
COMPILER_PATH=/usr/lib/gcc/i686-pc-linux-gnu/5.2.0/:/usr/lib/gcc/i686-pc-linux-gnu/5.2.0/:/usr/lib/gcc/i686-pc-linux-gnu/:/usr/lib/gcc/i686-pc-linux-gnu/5.2.0/:/usr/lib/gcc/i686-pc-linux-gnu/
LIBRARY_PATH=/usr/lib/gcc/i686-pc-linux-gnu/5.2.0/:/usr/lib/gcc/i686-pc-linux-gnu/5.2.0/../../../:/lib/:/usr/lib/
COLLECT_GCC_OPTIONS='-std=c++14' '-Wall' '-Wextra' '-v' '-save-temps'
'-shared-libgcc' '-mtune=generic' '-march=pentiumpro'
 /usr/lib/gcc/i686-pc-linux-gnu/5.2.0/collect2 -plugin
/usr/lib/gcc/i686-pc-linux-gnu/5.2.0/liblto_plugin.so
-plugin-opt=/usr/lib/gcc/i686-pc-linux-gnu/5.2.0/lto-wrapper
-plugin-opt=-fresolution=bug.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 --build-id
--eh-frame-hdr --hash-style=gnu -m elf_i386 -dynamic-linker /lib/ld-linux.so.2
/usr/lib/gcc/i686-pc-linux-gnu/5.2.0/../../../crt1.o
/usr/lib/gcc/i686-pc-linux-gnu/5.2.0/../../../crti.o
/usr/lib/gcc/i686-pc-linux-gnu/5.2.0/crtbegin.o
-L/usr/lib/gcc/i686-pc-linux-gnu/5.2.0
-L/usr/lib/gcc/i686-pc-linux-gnu/5.2.0/../../.. bug.o -lstdc++ -lm -lgcc_s
-lgcc -lc -lgcc_s -lgcc /usr/lib/gcc/i686-pc-linux-gnu/5.2.0/crtend.o
/usr/lib/gcc/i686-pc-linux-gnu/5.2.0/../../../crtn.o