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Add caf_shmem, a shared memory multi process coarray implementation. The library adheres to the existing coarray ABI and is controlled by environment variables for selecting the number of images and virtual memory size. Co-authored by: Thomas Koenig <tkoenig@gcc.gnu.org> Nicolas Koenig <koenigni@gcc.gnu.org> PR fortran/88076 libgfortran/ChangeLog: * Makefile.am: Add new library. * Makefile.in: Regenerated * acinclude.m4: Add check for reasonable clzl. * config.h.in: Regenerate. * configure: Regenerate. * configure.ac: Call clzl check.
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