aclocal_bugfix.m4

MPICH是MPI的重要研究,提供了一系列的接口函数,为并行计算的实现提供了编程环境.

dnl
dnl Fixes to bugs in AC_xxx macros
dnl 
dnl (AC_TRY_COMPILE is missing a newline after the end in the Fortran
dnl branch; that has been fixed in-place)
dnl
dnl (AC_PROG_CC makes many dubious assumptions.  One is that -O is safe
dnl with -g, even with gcc.  This isn't true; gcc will eliminate dead code
dnl when -O is used, even if you added code explicitly for debugging 
dnl purposes.  -O shouldn't do dead code elimination when -g is selected, 
dnl unless a specific option is selected.  Unfortunately, there is no
dnl documented option to turn off dead code elimination.
dnl
dnl
dnl (AC_CHECK_HEADER and AC_CHECK_HEADERS both make the erroneous assumption
dnl that the C-preprocessor and the C (or C++) compilers are the same program
dnl and have the same search paths.  In addition, CHECK_HEADER looks for 
dnl error messages to decide that the file is not available; unfortunately,
dnl it also interprets messages such as "evaluation copy" and warning messages
dnl from broken CPP programs (such as IBM's xlc -E, which often warns about 
dnl "lm not a valid option").  Instead, we try a compilation step with the 
dnl C compiler.
dnl
dnl AC_CONFIG_AUX_DIRS only checks for install-sh, but assumes other
dnl values are present.  Also doesn't provide a way to override the
dnl sources of the various configure scripts.  This replacement
dnl version of AC_CONFIG_AUX_DIRS overcomes this.
dnl Internal subroutine.
dnl Search for the configuration auxiliary files in directory list $1.
dnl We look only for install-sh, so users of AC_PROG_INSTALL
dnl do not automatically need to distribute the other auxiliary files.
dnl AC_CONFIG_AUX_DIRS(DIR ...)
dnl Also note that since AC_CONFIG_AUX_DIR_DEFAULT calls this, there
dnl isn't a easy way to fix it other than replacing it completely.
dnl This fix applies to 2.13
dnl/*D
dnl AC_CONFIG_AUX_DIRS - Find the directory containing auxillery scripts
dnl for configure
dnl
dnl Synopsis:
dnl AC_CONFIG_AUX_DIRS( [ directories to search ] )
dnl
dnl Output Effect:
dnl Sets 'ac_config_guess' to location of 'config.guess', 'ac_config_sub'
dnl to location of 'config.sub', 'ac_install_sh' to the location of
dnl 'install-sh' or 'install.sh', and 'ac_configure' to the location of a
dnl Cygnus-style 'configure'.  Only 'install-sh' is guaranteed to exist,
dnl since the other scripts are needed only by some special macros.
dnl
dnl The environment variable 'CONFIG_AUX_DIR', if set, overrides the
dnl directories listed.  This is an extension to the 'autoconf' version of
dnl this macro. 
dnlD*/
undefine([AC_CONFIG_AUX_DIRS])
AC_DEFUN(AC_CONFIG_AUX_DIRS,
[if test -f $CONFIG_AUX_DIR/install-sh ; then ac_aux_dir=$CONFIG_AUX_DIR 
else
ac_aux_dir=
for ac_dir in $1; do
  if test -f $ac_dir/install-sh; then
    ac_aux_dir=$ac_dir
    ac_install_sh="$ac_aux_dir/install-sh -c"
    break
  elif test -f $ac_dir/install.sh; then
    ac_aux_dir=$ac_dir
    ac_install_sh="$ac_aux_dir/install.sh -c"
    break
  fi
done
fi
if test -z "$ac_aux_dir"; then
  AC_MSG_ERROR([can not find install-sh or install.sh in $1])
fi
ac_config_guess=$ac_aux_dir/config.guess
ac_config_sub=$ac_aux_dir/config.sub
ac_configure=$ac_aux_dir/configure # This should be Cygnus configure.
AC_PROVIDE([AC_CONFIG_AUX_DIR_DEFAULT])dnl
])

undefine([AC_CHECK_HEADER])
AC_DEFUN(AC_CHECK_HEADER,
[dnl Do the transliteration at runtime so arg 1 can be a shell variable.
ac_safe=`echo "$1" | sed 'y%./+-%__p_%'`
AC_MSG_CHECKING([for $1])
AC_CACHE_VAL(ac_cv_header_$ac_safe,
[cat >conftest.c<<EOF
[#]line __oline__ "configure"
#include "confdefs.h"
#include <$1>
int conftest() {return 0;}
EOF
ac_compile_for_cpp='${CC-cc} -c $CFLAGS $CPPFLAGS conftest.c 1>&AC_FD_CC'
if AC_TRY_EVAL(ac_compile_for_cpp); then
    eval "ac_cv_header_$ac_safe=yes"
else
    eval "ac_cv_header_$ac_safe=no"
    echo "configure: failed program was:" >&AC_FD_CC
    cat conftest.c >&AC_FD_CC
fi
rm -f conftest*
])dnl
if eval "test \"`echo '$ac_cv_header_'$ac_safe`\" = yes"; then
  AC_MSG_RESULT(yes)
  ifelse([$2], , :, [$2])
else
  AC_MSG_RESULT(no)
ifelse([$3], , , [$3
])dnl
fi
])