I usualy go with a small shell script that checks to see, if the things I need can be compiled on the system.. I havnt had the time or the need to get full control of autoconf/make.
The usual structure in the script is somethign like this:
Code:
#!/bin/sh
DFLAGS=""
CC="$CC"
## setup echo on different systems
case `echo -n` in
*-n) * echo_front='' * * *echo_end='\c' * *;; * * *# SysV echo
**) * *echo_front=-n * * *echo_end='' * * *;; * * *# BSD echo
esac
## some testing with the --arguments
while [ x$1 != x ]; do case $1 in
* * * *--help)
* * * *cat <<EOF
Usage: configure [options]
* *--help * * * * * * * *Show this message
* *--quiet * * * * * * * Sshh.. Be vewy vewy quiet, I'm hunting wabbits
EOF
* * * *exit 0;;
* * * *--quiet)
* * * * * *QUIET="yes"
* * * * * *LOG="yes"
* * * * * *;;
* * * **) echo "Unrecognized option: $1"; exit 1;;
esac
shift
done
## Setup the loging feature
if [ "$QUIET" = "yes" ]; then
* * * *exec 6>/dev/null
else
* *exec 6>&1
fi
if [ "$LOG" = "yes" ]; then
* *exec 5>./config.log
* *echo "Logfile for debugging: ./config.log" 1>&6
fi
## some testing to find the c/C compiler
cat << EOF > __conftest.c
* *int main() { int class=0; return class; }
EOF
if [ x"$CC" = x ]; then
* *echo $echo_front "Looking for a C compiler... $echo_end" 1>&6
* *if [ "$LOG" = "yes" ]; then
* * * *echo $echo_front "Looking for a C compiler... $echo_end" 1>&5
* *fi
* *for TRY in gcc egcs g++ CC c++ cc; do
* * * (
* * * * * $TRY __conftest.c -o __conftest || exit 1;
* * * * * ./__conftest || exit 1;
* * * ) >/dev/null 2>&1 || continue;
* * * CC=$TRY
* * * break;
* *done
* *if [ x"'$CC'" = x ]; then
* * * *echo "failed" 1>&6
* * * *echo "Cannot find a C compiler. Run configure with --with-c-compiler." 1
>&6
* * * *if [ "$LOG" = "yes" ]; then
* * * * * *echo "failed" 1>&5
* * * * * *echo "Cannot find a C compiler. Run configure with --with-c-compiler
." 1>&5
* * * *fi
* * * *rm -f __conftest*
* * * *exit
* *fi
* *echo "$CC" 1>&6
* *if [ "$LOG" = "yes" ]; then
* * * *echo "$CC" 1>&5
* *fi
fi
## See if compiler works..
echo $echo_front "Checking if $CC compiler works... $echo_end" 1>&6
if [ "$LOG" = "yes" ]; then
* *echo $echo_front "Checking if $CC compiler works... $echo_end" 1>&5
fi
if (
* * * *$CC __conftest.c -o __conftest || exit 1
* * * *./__conftest || exit 1
* *) >/dev/null 2>&1; then
* *echo "yes" 1>&6
* *if [ "$LOG" = "yes" ]; then
* * * *echo "yes" 1>&5
* *fi
else
* *echo "no" 1>&6
* *echo "Compiler \"$CC\" does not exist or cannot compile C; try another." 1>&
6
* *if [ "$LOG" = "yes" ]; then
* * * *echo "no" 1>&5
* * * *echo "Compiler \"$CC\" does not exist or cannot compile C; try another."
1>&5
* *fi
* *rm -f __conftest*
* *exit
fi
## Test for what ever I need..
echo $echo_front "Checking for BSD signal semantics... $echo_end" 1>&6
if [ "$LOG" = "yes" ]; then
* *echo $echo_front "Checking for BSD signal semantics... $echo_end" 1>&5
fi
cat <<EOF >__conftest.c
#include <sys/types.h>
#include <unistd.h>
#include <signal.h>
int count=0;
void handle(int foo) { count++; }
int main() {
* *int pid=getpid();
* *signal(SIGINT, handle);
* *kill(pid,SIGINT);
* *if (count == 0) return 1;
* *return 0;
}
EOF
if (
* * *$CC __conftest.c *-o __conftest || exit 1
* * *./__conftest || exit 1
* ) >/dev/null 2>&1; then
* *echo "yes" 1>&6
* *if [ "$LOG" = "yes" ]; then
* * * *echo "yes" 1>&5
* *fi
else
* *if (
* * * * *$CC -D__USE_BSD_SIGNAL __conftest.c *-o __conftest || exit 1
* * * * *./__conftest || exit 1
* * * ) >/dev/null 2>&1; then
* * * *echo "-D__USE_BSD_SIGNAL" 1>&6
* * * *if [ "$LOG" = "yes" ]; then
* * * * * *echo "-D__USE_BSD_SIGNAL" 1>&5
* * * *fi
* * * *DFLAGS="$DFLAGS -D__USE_BSD_SIGNAL"
* *else
* * * *echo "no" 1>&6
* * * *echo "This package needs BSD signal semantics to run." 1>&6
* * * *if [ "$LOG" = "yes" ]; then
* * * * * *echo "no" 1>&5
* * * * * *echo "This package needs BSD signal semantics to run." 1>&5
* * * *fi
* * * *rm -f __conftest*
* * * *exit
* *fi
fi
rm -f __conftest*
## Lets say this was all that was needed...
echo $echo_front "Generating Makefile.guess... $echo_end" 1>&6
(
* *echo "# Generated by configure "
* *echo "#"
* *echo
* *echo "CC=$CC"
* *echo "DFLAGS=$DFLAGS" | sed 's/= */=/'
) > Makefile.guess
echo "done" 1>&6
And then in my Makefile I have as the first line:
include Makefile.guess *
Then if you havnt run your lovely small configure script, then it will return with "couldnt find file in include ... Makefile line.."
And else you'll just reffere to $CC and your $DFLAGS in your rules settigns when doing the %.o:%.c etc.
(I hope this want too much text for yabb to handle..)
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