MPI-3 added const in a bunch of places while also deleting the C++ bindings so these issues are not surprising. They’re also innocuous and should be ignored. If they bother you too much, they are very easy to fix and I’m sure a patch would be appreciated. Jeff On Sun, Oct 22, 2017 at 7:39 AM Vincent Bode <[email protected]> wrote:

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@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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-- Jeff Hammond [email protected] http://jeffhammond.github.io/ _______________________________________________ discuss mailing list [email protected] To manage subscription options or unsubscribe: https://lists.mpich.org/mailman/listinfo/discuss