dnl -*- shell-script -*- dnl dnl Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana dnl University Research and Technology dnl Corporation. All rights reserved. dnl Copyright (c) 2004-2005 The University of Tennessee and The University dnl of Tennessee Research Foundation. All rights dnl reserved. dnl Copyright (c) 2004-2005 High Performance Computing Center Stuttgart, dnl University of Stuttgart. All rights reserved. dnl Copyright (c) 2004-2005 The Regents of the University of California. dnl All rights reserved. dnl Copyright (c) 2009 Sun Microsystems, Inc. All rights reserved. dnl Copyright (c) 2014-2015 Intel, Inc. All rights reserved. dnl Copyright (c) 2015 Research Organization for Information Science dnl and Technology (RIST). All rights reserved. dnl $COPYRIGHT$ dnl dnl Additional copyrights may follow dnl dnl $HEADER$ dnl # OPAL_C_GET_ALIGN(type, config_var) # ---------------------------------- # Determine datatype alignment. # First arg is type, 2nd arg is config var to define. # Now that we require C99 compilers, we include stdbool.h # in the alignment test so that we can find the definition # of "bool" when we test for its alignment. We might be able # to avoid this if we test for alignemtn of _Bool, but # since we use "bool" in the code, let's be safe and check # what we use. Yes, they should be the same - but "should" and # "are" frequently differ AC_DEFUN([OPAL_C_GET_ALIGNMENT],[ AC_CACHE_CHECK([alignment of $1], [AS_TR_SH([opal_cv_c_align_$1])], [AC_RUN_IFELSE([AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT #include ], [[ struct foo { char c; $1 x; }; struct foo *p = (struct foo *) malloc(sizeof(struct foo)); int diff; FILE *f=fopen("conftestval", "w"); if (!f) exit(1); diff = ((char *)&p->x) - ((char *)&p->c); free(p); fprintf(f, "%d\n", (diff >= 0) ? diff : -diff); ]])], [AS_TR_SH([opal_cv_c_align_$1])=`cat conftestval`], [AC_MSG_WARN([*** Problem running configure test!]) AC_MSG_WARN([*** See config.log for details.]) AC_MSG_ERROR([*** Cannot continue.])], [ # cross compile - do a non-executable test. Trick # taken from the Autoconf 2.59c. Switch to using # AC_CHECK_ALIGNOF when we can require Autoconf 2.60. _AC_COMPUTE_INT([(long int) offsetof (opal__type_alignof_, y)], [AS_TR_SH([opal_cv_c_align_$1])], [AC_INCLUDES_DEFAULT #include #ifndef offsetof # define offsetof(type, member) ((char *) &((type *) 0)->member - (char *) 0) #endif typedef struct { char x; $1 y; } opal__type_alignof_; ], [AC_MSG_WARN([*** Problem running configure test!]) AC_MSG_WARN([*** See config.log for details.]) AC_MSG_ERROR([*** Cannot continue.])])])]) AC_DEFINE_UNQUOTED([$2], [$AS_TR_SH([opal_cv_c_align_$1])], [Alignment of type $1]) eval "$2=$AS_TR_SH([opal_cv_c_align_$1])" rm -rf conftest* ]) dnl