blfs-8.0: dosemu can't see glibc

jr_bob_dobbs · 09-15-2017, 01:56 PM

Attempting to compile dosemu for my BLFS system. The configure phase fails, claiming that I have either no glibc or that I have a glibc that is older than the required version of 2.1.3.

A review of the LFS book indicates that I have version 2.25. Now, I'm not a linux expert, despite running a BLFS as my main system, but it seems to me that 25 is greater than 1 and that a larger number indicates a newer version. So that one leads one to suspect that I have a version of glibc that is newer than what dosemu needs, not older.

A look at the section of the configure script that appears to do the version checking:

Code:

 { echo "$as_me:$LINENO: checking for glibc..." >&5
echo $ECHO_N "checking for glibc...... $ECHO_C" >&6; }
  set `printf '%b\n' '#include <features.h>\nXXAaZZ __GLIBC__ XXBbZZ __GLIBC_MINOR__'|${CC-cc} -E -|awk '/XXAaZZ/ {print $2 " " $4}'`
  major=$1; minor=$2
  if test "$major" = "__GLIBC__"; then
    { { echo "$as_me:$LINENO: error: Sorry, you need glibc-2.1.3 or newer." >&5
echo "$as_me: error: Sorry, you need glibc-2.1.3 or newer." >&2;}
   { (exit 1); exit 1; }; }
  else
    if test "$minor" = "__GLIBC_MINOR__"; then
      minor=0;
    fi
    GLIBC_VERSION_CODE=$((($major * 1000) + $minor))
    { echo "$as_me:$LINENO: result: yes, version code $GLIBC_VERSION_CODE" >&5
echo "${ECHO_T}yes, version code $GLIBC_VERSION_CODE" >&6; }
    if test $GLIBC_VERSION_CODE -lt 2001; then
      { { echo "$as_me:$LINENO: error: Sorry, you need glibc-2.1.3 or newer." >&5
echo "$as_me: error: Sorry, you need glibc-2.1.3 or newer." >&2;}
   { (exit 1); exit 1; }; }
    fi
  fi

That's a bit too convoluted for me to dare try hard-coding or skipping the check.

Can someone (who has compiled dosemu, hopefully) please clue me in? Thank you.

p.s. note: I am working with 1.4.0 of dosemu, following a slackbuilds.org slackbuild for the process.

norobro · 09-16-2017, 11:35 AM

It looks like things have changed since that config.ac was written in 2007.
On my Debian box:

Code:

~$ printf '%b\n' '#include <features.h>\nXXAaZZ __GLIBC__ XXBbZZ __GLIBC_MINOR__'|${CC-cc} -E -
...
XXAaZZ 
# 2 "<stdin>" 3 4
      2 
# 2 "<stdin>"
                XXBbZZ 
# 2 "<stdin>" 3 4
                       24

Notice that XXAazz is on a line by itself so awk '/XXAaZZ/ {print $2 " " $4}' returns nothing.

Don't know whether this will work or not but you might try hard coding your glibc version in the configure script like this:

Code:

...
set `printf '%b\n' '#include <features.h>\nXXAaZZ __GLIBC__ XXBbZZ __GLIBC_MINOR__'|${CC-cc} -E -|awk '/XXAaZZ/ {print $2 " " $4}'`
  major="2"; minor="25"
  if test "$major" = "__GLIBC__"; then
...

Or you can change configure.ac and rerun configure.

HTH