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README: Clarify note about ld issue for XL and PGI on PPC #4048

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README: Clarify note about ld issue for XL and PGI on PPC #4048

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14 changes: 8 additions & 6 deletions README
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Expand Up @@ -196,15 +196,17 @@ Compiler Notes
for more details:
https://github.com/open-mpi/ompi/issues/3612

- Compiling Fortran programs using the mpi_f08 module on PowerPC with
the PGI (tested 17.5) or XL (tested v15.1.5) Fortran compilers and GNU
linker after 2.25.1 and before 2.28 will likely experience runtime failures.
- MPI applications that use the mpi_f08 module on PowerPC platforms
(tested ppc64le) will likely experience runtime failures if:
- they are using a GNU linker (ld) version after v2.25.1 and before v2.28,
-and-
- they compiled with PGI (tested 17.5) or XL (tested v15.1.5) compilers.
This was noticed on Ubuntu 16.04 which uses the 2.26.1 version of ld by
default. However, this issue impacts any OS running the impacted
version of ld. This GNU linker regression will be fixed in version 2.28.
default. However, this issue impacts any OS using a version of ld noted
above. This GNU linker regression will be fixed in version 2.28.
Below is a link to the GNU bug on this issue:
https://sourceware.org/bugzilla/show_bug.cgi?id=21306
The XL compiler will have a fix for this issue in their next release.
The XL compiler will include a fix for this issue in a future release.

- On NetBSD-6 (at least AMD64 and i386), and possibly on OpenBSD,
libtool misidentifies properties of f95/g95, leading to obscure
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