build: replace ninjatool with ninja

Now that the build is done entirely by Meson, there is no need
to keep the Makefile conversion.  Instead, we can ask Ninja about
the targets it exposes and forward them.

The main advantages are, from smallest to largest:

- reducing the possible namespace pollution within the Makefile

- removal of a relatively large Python program

- faster build because parsing Makefile.ninja is slower than
parsing build.ninja; and faster build after Meson runs because
we do not have to generate Makefile.ninja.

- tracking of command lines, which provides more accurate rebuilds

In addition the change removes the requirement for GNU make 3.82, which
was annoying on Mac, and avoids bugs on Windows due to ninjatool not
knowing how to convert Windows escapes to POSIX escapes.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 6 insertions, 3 deletions

diff --git a/configure b/configure
index 3bb5de40d6..483c9ec322 100755
--- a/configure
+++ b/configure
@@ -1905,7 +1905,7 @@ case "$meson" in
     *) meson=$(command -v "$meson") ;;
 esac
 
-# Probe for ninja (used for compdb)
+# Probe for ninja
 
 if test -z "$ninja"; then
     for c in ninja ninja-build samu; do
@@ -1914,6 +1914,9 @@ if test -z "$ninja"; then
             break
         fi
     done
+    if test -z "$ninja"; then
+      error_exit "Cannot find Ninja"
+    fi
 fi
 
 # Check that the C compiler works. Doing this here before testing
@@ -6779,6 +6782,7 @@ echo "PYTHON=$python" >> $config_host_mak
 echo "SPHINX_BUILD=$sphinx_build" >> $config_host_mak
 echo "GENISOIMAGE=$genisoimage" >> $config_host_mak
 echo "MESON=$meson" >> $config_host_mak
+echo "NINJA=$ninja" >> $config_host_mak
 echo "CC=$cc" >> $config_host_mak
 if $iasl -h > /dev/null 2>&1; then
   echo "CONFIG_IASL=$iasl" >> $config_host_mak
@@ -7030,7 +7034,7 @@ fi
 mv $cross config-meson.cross
 
 rm -rf meson-private meson-info meson-logs
-NINJA=${ninja:-$PWD/ninjatool} $meson setup \
+NINJA=$ninja $meson setup \
         --prefix "$prefix" \
         --libdir "$libdir" \
         --libexecdir "$libexecdir" \
@@ -7063,7 +7067,6 @@ NINJA=${ninja:-$PWD/ninjatool} $meson setup \
 if test "$?" -ne 0 ; then
     error_exit "meson setup failed"
 fi
-touch ninjatool.stamp
 fi
 
 if test -n "${deprecated_features}"; then