115 lines
3.6 KiB
Plaintext
115 lines
3.6 KiB
Plaintext
dnl By default, many hosts won't let programs access large files;
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dnl one must use special compiler options to get large-file access to work.
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dnl For more details about this brain damage please see:
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dnl http://www.sas.com/standards/large.file/x_open.20Mar96.html
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dnl Written by Paul Eggert <eggert@twinsun.com>.
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dnl Internal subroutine of AC_SYS_EXTRA_LARGEFILE.
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dnl AC_SYS_EXTRA_LARGEFILE_FLAGS(FLAGSNAME)
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AC_DEFUN([AC_SYS_EXTRA_LARGEFILE_FLAGS],
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[AC_CACHE_CHECK([for $1 value to request large file support],
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ac_cv_sys_largefile_$1,
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[ac_cv_sys_largefile_$1=`($GETCONF LFS_$1) 2>/dev/null` || {
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ac_cv_sys_largefile_$1=no
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ifelse($1, CFLAGS,
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[case "$host_os" in
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# IRIX 6.2 and later require cc -n32.
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changequote(, )dnl
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irix6.[2-9]* | irix6.1[0-9]* | irix[7-9].* | irix[1-9][0-9]*)
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changequote([, ])dnl
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if test "$GCC" != yes; then
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ac_cv_sys_largefile_CFLAGS=-n32
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fi
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ac_save_CC="$CC"
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CC="$CC $ac_cv_sys_largefile_CFLAGS"
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AC_TRY_LINK(, , , ac_cv_sys_largefile_CFLAGS=no)
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CC="$ac_save_CC"
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esac])
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}])])
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dnl Internal subroutine of AC_SYS_EXTRA_LARGEFILE.
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dnl AC_SYS_EXTRA_LARGEFILE_SPACE_APPEND(VAR, VAL)
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AC_DEFUN([AC_SYS_EXTRA_LARGEFILE_SPACE_APPEND],
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[case $2 in
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no) ;;
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?*)
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case "[$]$1" in
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'') $1=$2 ;;
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*) $1=[$]$1' '$2 ;;
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esac ;;
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esac])
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dnl Internal subroutine of AC_SYS_EXTRA_LARGEFILE.
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dnl AC_SYS_EXTRA_LARGEFILE_MACRO_VALUE(C-MACRO, CACHE-VAR, COMMENT, CODE-TO-SET-DEFAULT)
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AC_DEFUN([AC_SYS_EXTRA_LARGEFILE_MACRO_VALUE],
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[AC_CACHE_CHECK([for $1], $2,
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[$2=no
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changequote(, )dnl
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$4
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for ac_flag in $ac_cv_sys_largefile_CFLAGS no; do
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case "$ac_flag" in
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-D$1)
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$2=1 ;;
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-D$1=*)
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$2=`expr " $ac_flag" : '[^=]*=\(.*\)'` ;;
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esac
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done
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changequote([, ])dnl
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])
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if test "[$]$2" != no; then
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AC_DEFINE_UNQUOTED([$1], [$]$2, [$3])
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fi])
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AC_DEFUN([AC_SYS_EXTRA_LARGEFILE],
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[AC_REQUIRE([AC_CANONICAL_HOST])
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AC_ARG_ENABLE(largefile,
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[ --disable-largefile omit support for large files])
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if test "$enable_largefile" != no; then
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AC_CHECK_TOOL(GETCONF, getconf)
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AC_SYS_EXTRA_LARGEFILE_FLAGS(CFLAGS)
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AC_SYS_EXTRA_LARGEFILE_FLAGS(LDFLAGS)
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AC_SYS_EXTRA_LARGEFILE_FLAGS(LIBS)
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for ac_flag in $ac_cv_sys_largefile_CFLAGS no; do
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case "$ac_flag" in
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no) ;;
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-D_FILE_OFFSET_BITS=*) ;;
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-D_LARGEFILE_SOURCE | -D_LARGEFILE_SOURCE=*) ;;
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-D_LARGE_FILES | -D_LARGE_FILES=*) ;;
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-D?* | -I?*)
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AC_SYS_EXTRA_LARGEFILE_SPACE_APPEND(CPPFLAGS, "$ac_flag") ;;
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*)
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AC_SYS_EXTRA_LARGEFILE_SPACE_APPEND(CFLAGS, "$ac_flag") ;;
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esac
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done
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AC_SYS_EXTRA_LARGEFILE_SPACE_APPEND(LDFLAGS, "$ac_cv_sys_largefile_LDFLAGS")
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AC_SYS_EXTRA_LARGEFILE_SPACE_APPEND(LIBS, "$ac_cv_sys_largefile_LIBS")
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AC_SYS_EXTRA_LARGEFILE_MACRO_VALUE(_FILE_OFFSET_BITS,
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ac_cv_sys_file_offset_bits,
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[Number of bits in a file offset, on hosts where this is settable.])
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[case "$host_os" in
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# HP-UX 10.20 and later
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hpux10.[2-9][0-9]* | hpux1[1-9]* | hpux[2-9][0-9]*)
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ac_cv_sys_file_offset_bits=64 ;;
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esac]
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AC_SYS_EXTRA_LARGEFILE_MACRO_VALUE(_LARGEFILE_SOURCE,
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ac_cv_sys_largefile_source,
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[Define to make fseeko etc. visible, on some hosts.],
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[case "$host_os" in
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# HP-UX 10.20 and later
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hpux10.[2-9][0-9]* | hpux1[1-9]* | hpux[2-9][0-9]*)
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ac_cv_sys_largefile_source=1 ;;
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esac])
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AC_SYS_EXTRA_LARGEFILE_MACRO_VALUE(_LARGE_FILES,
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ac_cv_sys_large_files,
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[Define for large files, on AIX-style hosts.],
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[case "$host_os" in
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# AIX 4.2 and later
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aix4.[2-9]* | aix4.1[0-9]* | aix[5-9].* | aix[1-9][0-9]*)
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ac_cv_sys_large_files=1 ;;
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esac])
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fi
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])
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