The vast majority of these errors are of no concern. I suggest that you do not set --enable-strict unless you intend to carefully inspect the resulting warnings for significance. If size_t is only typedef'd to 'unsigned int' since this is a 32-bit system, then the implicit cast to 'long unsigned int' is really not a big deal. There is no need for an MPI implementation to print anything for a correct (i.e. standard-compliant) program so those printf calls are probably warnings or errors. I recall that %zu is C99 so MPICH would need an explicit up-cast to "long unsigned" there but I fail to see how it matters. I do not see how any possible harm can come from "unused-but-set-variable". The "empty-body" warning is similarly of no interest. There is no reason to care about "unused-function". The compiler or linker should remove it from the object/binary anyways. I didn't look at the MPICH source but every time I have seen "maybe-uninitialized" warnings, it is not actually possible for the variable to be uninitialized, but rather that the compiler cannot figure this out for certain (maybe it's equivalent to the halting problem to do so...). It is just pedantic to tell the user that a comparison to NULL will always be true. The compiler will probably optimize this away anyways if it is certain about the branch. The only error that has me even the slightest bit worried is "nonnull" but my guess is that it really doesn't matter. If you inspect the source and find that my analysis is misguided and these warnings correspond to real problems that need addressing, I'm sure that the MPICH team will welcome your contribution of a patch for them. Best, Jeff $ grep warning Log src/mpltrmem.c:352:17: warning: format '%lu' expects argument of type 'long unsigned int', but argument 5 has type 'size_t' [-Wformat=] src/mpltrmem.c:372:17: warning: format '%lu' expects argument of type 'long unsigned int', but argument 5 has type 'size_t' [-Wformat=] src/mpltrmem.c:414:9: warning: format '%lu' expects argument of type 'long unsigned int', but argument 4 has type 'size_t' [-Wformat=] src/mpltrmem.c:531:17: warning: format '%lu' expects argument of type 'long unsigned int', but argument 5 has type 'size_t' [-Wformat=] src/mpltrmem.c:597:13: warning: format '%lu' expects argument of type 'long unsigned int', but argument 4 has type 'size_t' [-Wformat=] src/mpltrmem.c:583:14: warning: variable 'old_head' set but not used [-Wunused-but-set-variable] mpi-io/mpiu_external32.c:123:14: warning: unused variable 'extent' [-Wunused-variable] ./pm/pmiserv/pmip_cb.c:811:9: warning: null argument where non-null required (argument 1) [-Wnonnull] ./pm/pmiserv/pmip_cb.c:811:9: warning: null argument where non-null required (argument 2) [-Wnonnull] src/mpi/coll/opminloc.c:85:24: warning: variable 'flen' set but not used [-Wunused-but-set-variable] src/mpi/coll/opmaxloc.c:86:24: warning: variable 'flen' set but not used [-Wunused-but-set-variable] src/mpid/ch3/src/ch3u_handle_connection.c:316:194: warning: suggest braces around empty body in an 'if' statement [-Wempty-body] src/mpid/ch3/src/ch3u_rma_sync.c:2884:12: warning: 'MPIDI_CH3I_Send_flush_msg' defined but not used [-Wunused-function] ./src/include/mpimem.h:267:31: warning: 'mpiu_chkpmem_stk_[0]' may be used uninitialized in this function [-Wmaybe-uninitialized] ./src/include/mpimem.h:267:31: warning: 'mpiu_chkpmem_stk_[0]' may be used uninitialized in this function [-Wmaybe-uninitialized] ./src/include/mpimem.h:480:32: warning: the comparison will always evaluate as 'true' for the address of 'MPID_nem_tcp_g_lstn_sc' will never be NULL [-Waddress] ./src/include/mpimem.h:480:32: warning: the comparison will always evaluate as 'true' for the address of 'MPID_nem_tcp_g_lstn_plfd' will never be NULL [-Waddress] src/mpid/common/datatype/mpid_type_debug.c:238:59: warning: variable 'sticky_ub' set but not used [-Wunused-but-set-variable] src/mpid/common/datatype/mpid_type_debug.c:238:48: warning: variable 'sticky_lb' set but not used [-Wunused-but-set-variable] src/mpid/common/datatype/mpid_type_debug.c:238:44: warning: variable 'ub' set but not used [-Wunused-but-set-variable] src/mpid/common/datatype/mpid_type_debug.c:238:31: warning: variable 'true_ub' set but not used [-Wunused-but-set-variable] src/mpid/common/datatype/mpid_type_debug.c:236:11: warning: variable 'string' set but not used [-Wunused-but-set-variable] ./src/include/mpir_nbc.h:151:23: warning: 'mpir_sched_chkpmem_stk_[0]' may be used uninitialized in this function [-Wmaybe-uninitialized] ./src/include/mpimem.h:267:31: warning: 'mpir_sched_chkpmem_stk_[0]' may be used uninitialized in this function [-Wmaybe-uninitialized] ./src/include/mpir_nbc.h:151:23: warning: 'mpir_sched_chkpmem_stk_[0]' may be used uninitialized in this function [-Wmaybe-uninitialized] ./src/include/mpir_nbc.h:151:23: warning: 'mpir_sched_chkpmem_stk_[0]' may be used uninitialized in this function [-Wmaybe-uninitialized] ./src/include/mpimem.h:267:31: warning: 'mpir_sched_chkpmem_stk_[0]' may be used uninitialized in this function [-Wmaybe-uninitialized] ./src/include/mpimem.h:267:31: warning: 'mpir_sched_chkpmem_stk_[0]' may be used uninitialized in this function [-Wmaybe-uninitialized] ./src/include/mpir_nbc.h:151:23: warning: 'mpir_sched_chkpmem_stk_[0]' may be used uninitialized in this function [-Wmaybe-uninitialized] ./src/include/mpimem.h:267:31: warning: 'mpir_sched_chkpmem_stk_[0]' may be used uninitialized in this function [-Wmaybe-uninitialized] On Mon, May 13, 2013 at 2:46 PM, Yauheni Zelenko <[email protected]> wrote:

Hi, Jeff!

See attached file in original e-mail.

Eugene. ________________________________________ From: [email protected] [[email protected]] On Behalf Of Jeff Hammond [[email protected]] Sent: Monday, May 13, 2013 11:59 AM To: [email protected] Subject: Re: [mpich-discuss] GCC 4.8.0 warnings

Care to share make.log with the warnings to which you refer?

Jeff

On Mon, May 13, 2013 at 1:51 PM, Yauheni Zelenko <[email protected]> wrote:

...

Hi, Antonio!

I compiled on RHEL 6.0.

My configuration is:

./configure --prefix=${InstallDir} \ --with-pm=hydra --with-device=ch3:nemesis \ --disable-chekpointing \ --enable-strict --enable-fast=O3 \ --disable-f77 --disable-fc \ CC=${GCCDir}/bin/gcc CFLAGS="-m32 -fPIC" \ CPP=${GCCDir}/bin/cpp \ CXX=${GCCDir}/bin/g++ CXXFLAGS="-m32 -fPIC" \ CXXCPP=${GCCDir}/bin/cpp \

Eugene. ________________________________________ From: Antonio J. Peña [[email protected]] Sent: Monday, May 13, 2013 11:37 AM To: [email protected] Cc: Yauheni Zelenko Subject: Re: [mpich-discuss] GCC 4.8.0 warnings

Hi Eugene,

Could you please provide us with the whole details of your platform? (i.e., Linux distribution and version, and HW details).

Thanks, Antonio

On Monday, May 13, 2013 11:25:38 AM Yauheni Zelenko wrote:

...

Hi!

I compiled recent nightly build (3.0.4 as of May 13) with GCC 4.8.0.

There are some warnings which will be good idea to fix.

Eugene.

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-- Jeff Hammond Argonne Leadership Computing Facility University of Chicago Computation Institute [email protected] / (630) 252-5381 http://www.linkedin.com/in/jeffhammond https://wiki.alcf.anl.gov/parts/index.php/User:Jhammond ALCF docs: http://www.alcf.anl.gov/user-guides _______________________________________________ discuss mailing list [email protected] To manage subscription options or unsubscribe: https://lists.mpich.org/mailman/listinfo/discuss _______________________________________________ discuss mailing list [email protected] To manage subscription options or unsubscribe: https://lists.mpich.org/mailman/listinfo/discuss

-- Jeff Hammond Argonne Leadership Computing Facility University of Chicago Computation Institute [email protected] / (630) 252-5381 http://www.linkedin.com/in/jeffhammond https://wiki.alcf.anl.gov/parts/index.php/User:Jhammond ALCF docs: http://www.alcf.anl.gov/user-guides