[mpich-discuss] GCC Compiler Warnings in mpicxx.h when compiling with -Wcast-qual

[Vincent Bode]

Dear MPICH Discuss,

 

When compiling a program that includes the header mpi.h with the GCC
Compiler option -Wcast-qual several compiler warnings occur in mpicxx.h:

 

In file included from /usr/include/mpich/mpi.h:2231:0,

  /usr/include/mpich/mpicxx.h: In member function 'virtual void
MPI::Datatype::Set_attr(int, const void*)':

   /usr/include/mpich/mpicxx.h:335:90: warning: cast from type 'const void*'
to type 'void*' casts away qualifiers [-Wcast-qual]

           MPIX_CALLWORLD( MPI_Type_set_attr( (MPI_Datatype)
the_real_datatype, v2, (void *)v3 ));

 
^

  /usr/include/mpich/mpicxx.h:87:17: note: in definition of macro
'MPIX_CALLWORLD'

       { int err = fnc ; if (err) MPIR_Call_world_errhand( err ); }

                 ^

 

There appear to be 17 compiler warnings of this type:

 

mpicxx.h:335, GNU C Compiler 4 (gcc), Priority: Normal 

cast from type 'const void*' to type 'void*' casts away qualifiers
[-Wcast-qual]

 

mpicxx.h:633, GNU C Compiler 4 (gcc), Priority: Normal 

cast from type 'const int (*)[3]' to type 'int (*)[3]' casts away qualifiers
[-Wcast-qual]

 

mpicxx.h:639, GNU C Compiler 4 (gcc), Priority: Normal 

cast from type 'const int (*)[3]' to type 'int (*)[3]' casts away qualifiers
[-Wcast-qual]

 

mpicxx.h:1087, GNU C Compiler 4 (gcc), Priority: Normal 

cast from type 'const MPI_Request* {aka const int*}' to type 'MPI_Request*
{aka int*}' casts away qualifiers [-Wcast-qual]

 

mpicxx.h:1412, GNU C Compiler 4 (gcc), Priority: Normal 

cast from type 'const void*' to type 'void*' casts away qualifiers
[-Wcast-qual]

 

mpicxx.h:1690, GNU C Compiler 4 (gcc), Priority: Normal

cast from type 'const char*' to type 'char*' casts away qualifiers
[-Wcast-qual]

 

mpicxx.h:1691, GNU C Compiler 4 (gcc), Priority: Normal 

cast from type 'const char**' to type 'char**' casts away qualifiers
[-Wcast-qual]

 

mpicxx.h:1698, GNU C Compiler 4 (gcc), Priority: Normal 

cast from type 'const char*' to type 'char*' casts away qualifiers
[-Wcast-qual] 

 

mpicxx.h:1699, GNU C Compiler 4 (gcc), Priority: Normal 

cast from type 'const char**' to type 'char**' casts away qualifiers
[-Wcast-qual]

 

mpicxx.h:1712, GNU C Compiler 4 (gcc), Priority: Normal 

cast from type 'const char**' to type 'char**' casts away qualifiers
[-Wcast-qual]

 

mpicxx.h:1713, GNU C Compiler 4 (gcc), Priority: Normal 

cast from type 'const char***' to type 'char***' casts away qualifiers
[-Wcast-qual]

 

mpicxx.h:1713, GNU C Compiler 4 (gcc), Priority: Normal 

cast from type 'const int*' to type 'int*' casts away qualifiers
[-Wcast-qual]

 

mpicxx.h:1727, GNU C Compiler 4 (gcc), Priority: Normal 

cast from type 'const char**' to type 'char**' casts away qualifiers
[-Wcast-qual]

 

mpicxx.h:1728, GNU C Compiler 4 (gcc), Priority: Normal 

cast from type 'const char***' to type 'char***' casts away qualifiers
[-Wcast-qual]

mpicxx.h:1728, GNU C Compiler 4 (gcc), Priority: Normal 

cast from type 'const int*' to type 'int*' casts away qualifiers
[-Wcast-qual]

 

mpicxx.h:1851, GNU C Compiler 4 (gcc), Priority: Normal 

cast from type 'const void*' to type 'void*' casts away qualifiers
[-Wcast-qual]

 

mpicxx.h:1872, GNU C Compiler 4 (gcc), Priority: Normal 

cast from type 'const void*' to type 'void*' casts away qualifiers
[-Wcast-qual]

 

A minimum working example of just translating the MPICH mpi.h header using 

 

mpicxx.mpich -o /tmp/test.o -c -fPIC -O3 -g -cxx=g++ -Wall -Wextra
-Wcast-qual -Wconversion -Wformat=2 -Wformat-nonliteral -Wformat-security
-Winit-self -Wmissing-format-attribute -Wmissing-include-dirs -Wpacked
-Wunreachable-code -Wunused -Wno-unused-parameter -Wswitch-enum
-Wredundant-decls -pedantic -Wswitch-default -fno-strict-aliasing
-funroll-loops -mfpmath=sse -fopenmp -fno-omit-frame-pointer -msse3 -fPIC
-std=c++11 /usr/include/mpich/mpi.h

 

produces the same compiler warnings on the following environment (mpich
packages from the debian repository): 

 

debian at debian:~$ mpicxx.mpich -v

mpicxx for MPICH version 3.2

Using built-in specs.

COLLECT_GCC=g++

COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/6/lto-wrapper

Target: x86_64-linux-gnu

Configured with: ../src/configure -v --with-pkgversion='Debian 6.3.0-18'
--with-bugurl=file:///usr/share/doc/gcc-6/README.Bugs
--enable-languages=c,ada,c++,java,go,d,fortran,objc,obj-c++ --prefix=/usr
--program-suffix=-6 --program-prefix=x86_64-linux-gnu- --enable-shared
--enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext
--enable-threads=posix --libdir=/usr/lib --enable-nls --with-sysroot=/
--enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes
--with-default-libstdcxx-abi=new --enable-gnu-unique-object
--disable-vtable-verify --enable-libmpx --enable-plugin --enable-default-pie
--with-system-zlib --disable-browser-plugin --enable-java-awt=gtk
--enable-gtk-cairo --with-java-home=/usr/lib/jvm/java-1.5.0-gcj-6-amd64/jre
--enable-java-home --with-jvm-root-dir=/usr/lib/jvm/java-1.5.0-gcj-6-amd64
--with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-6-amd64
--with-arch-directory=amd64 --with-ecj-jar=/usr/share/java/eclipse-ecj.jar
--with-target-system-zlib --enable-objc-gc=auto --enable-multiarch
--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 6.3.0 20170516 (Debian 6.3.0-18)

 

Sincerely,

Vincent

 

 

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