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These warnings are directly from gfortran. You should be able to reproduce the warnings with `gfortran -Wall -c mpif90_bug_report.f`. `mpif90` is just a wrapper around `gfortran`, you can verify that by `mpif90 -show`. The `-Wall` flag is probably added by
the config option during mpich configure.
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Hui Zhou</div>
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T: 630-252-3430</div>
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<div class="">On May 16, 2019, at 9:06 PM, Jonathan Ravens via discuss <<a href="mailto:discuss@mpich.org" class="">discuss@mpich.org</a>> wrote:</div>
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<div style="margin-top: 0px; margin-bottom: 0px;" class="">Dear MPIf90 maintainers,<br class="">
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<div style="margin-top: 0px; margin-bottom: 0px;" class="">I appear to have found a bug with mpif90, running under Centos 7. Essentially any assignment to a byte variable gives a warning or an error. The errors are fatal, and the warnings are too numerous
to ignore (I'm getting one warning for each byte that is initialised in a DATA statement, so that can be many thousands of warnings). We have used code like this since 1982 without any problems.<br class="">
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<div class="">When mpif90 is used to compile a simple Fortran source with the -fno-range-check option, any byte assignment in code or data statement will give a warning, eg :<br class="">
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<i class="">mpif90_bug_report.f:30.13:<br class="">
b1 = 6<br class="">
1<br class="">
Warning: Possible change of value in conversion from INTEGER(4) to INTEGER(1) at (1)</i><br class="">
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This only happens with 'mpif90 -c -fno-range-check'; there is no warning when using gfortran. However, without -fno-range-check, we get other, fatal, errors, so that's even worse :<br class="">
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<div class=""> <i class=""> mpif90_bug_report.f:28.24:<br class="">
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byte b2 / '89'X/<br class="">
1</i></div>
<div class=""><i class=""> Error: Arithmetic overflow converting INTEGER(16) to INTEGER(1) at (1). This check can be disabled with the option -fno-range-check<br class="">
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I've attached a simple program to replicate the problem (<span class="">mpif90_bug_report.f</span>)
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<div style="margin-top: 0px; margin-bottom: 0px;" class="">The environment details are :</div>
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<div style="margin-top: 0px; margin-bottom: 0px;" class="">> more /etc/redhat-release<br class="">
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<div class="">CentOS Linux release 7.6.1810 (Core)<br class="">
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<div class="">> uname -a<br class="">
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<div class="">Linux ... 3.10.0-957.5.1.el7.x86_64 #1 SMP Fri Feb 1 14:54:57 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux<br class="">
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<div class="">> mpif90 -v<br class="">
mpif90 for MPICH version 3.0.4<br class="">
Using built-in specs.<br class="">
COLLECT_GCC=gfortran<br class="">
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-redhat-linux/4.8.5/lto-wrapper<br class="">
Target: x86_64-redhat-linux<br class="">
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --with-bugurl=<a href="http://bugzilla.redhat.com/bugzilla" class="">http://bugzilla.redhat.com/bugzilla</a> --enable-bootstrap --enable-shared --enable-threads=posix
--enable-checking=release --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-gnu-unique-object --enable-linker-build-id --with-linker-hash-style=gnu --enable-languages=c,c++,objc,obj-c++,java,fortran,ada,go,lto --enable-plugin
--enable-initfini-array --disable-libgcj --with-isl=/builddir/build/BUILD/gcc-4.8.5-20150702/obj-x86_64-redhat-linux/isl-install --with-cloog=/builddir/build/BUILD/gcc-4.8.5-20150702/obj-x86_64-redhat-linux/cloog-install --enable-gnu-indirect-function --with-tune=generic
--with-arch_32=x86-64 --build=x86_64-redhat-linux<br class="">
Thread model: posix<br class="">
gcc version 4.8.5 20150623 (Red Hat 4.8.5-36) (GCC) <br class="">
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Please don't hestitate to let me know if any further details are needed.</div>
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<div class="">Many thanks,</div>
<div class="">Jonathan Ravens<br class="">
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<span id="cid:f_jvrfxvtu0"><mpif90_bug_report.f></span>_______________________________________________<br class="">
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