configure: use correct cflags in compiler checks
linux-user build on fedora 11 breaks because fallocate
is broken on that system if -D_GNU_SOURCE -D_FILE_OFFSET_BITS=64
are specified, which is what QEMU uses.
We do have a configure check to catch this and disable fallocate,
however, it turns out that default QEMU_CFLAGS/LDFLAGS were assigned in
script *after* all compiler checks: so during checks we were not running
compiler with same flags that we used for build later.
Fix this by moving QEMU_CFLAGS to before compiler checks, and using
comple_prog when checking for fallocate. This also fixes the fact that
we do some compiler checks while assigning the flags, right below a
comment that says "no cc tests beyond this point".
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
diff --git a/configure b/configure
index dca5a43..8b8b94c 100755
--- a/configure
+++ b/configure
@@ -91,6 +91,26 @@
objcopy="${cross_prefix}${objcopy}"
ld="${cross_prefix}${ld}"
+# default flags for all hosts
+QEMU_CFLAGS="-fno-strict-aliasing $QEMU_CFLAGS"
+CFLAGS="-g $CFLAGS"
+QEMU_CFLAGS="-Wall -Wundef -Wendif-labels -Wwrite-strings -Wmissing-prototypes $QEMU_CFLAGS"
+QEMU_CFLAGS="-Wstrict-prototypes -Wredundant-decls $QEMU_CFLAGS"
+QEMU_CFLAGS="-D_GNU_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE $QEMU_CFLAGS"
+QEMU_CFLAGS="-U_FORTIFY_SOURCE $QEMU_CFLAGS"
+QEMU_CFLAGS="-I. -I\$(SRC_PATH) $QEMU_CFLAGS"
+LDFLAGS="-g $LDFLAGS"
+
+gcc_flags="-Wold-style-declaration -Wold-style-definition"
+cat > $TMPC << EOF
+int main(void) { }
+EOF
+for flag in $gcc_flags; do
+ if compile_prog "$QEMU_CFLAGS" "$flag" ; then
+ QEMU_CFLAGS="$flag $QEMU_CFLAGS"
+ fi
+done
+
# check that the C compiler works.
cat > $TMPC <<EOF
int main(void) {}
@@ -1596,7 +1616,7 @@
return 0;
}
EOF
-if compile_prog "" "" ; then
+if compile_prog "$ARCH_CFLAGS" "" ; then
fallocate=yes
fi
@@ -1744,28 +1764,9 @@
# End of CC checks
# After here, no more $cc or $ld runs
-# default flags for all hosts
-QEMU_CFLAGS="-fno-strict-aliasing $QEMU_CFLAGS"
-CFLAGS="-g $CFLAGS"
if test "$debug" = "no" ; then
CFLAGS="-O2 $CFLAGS"
fi
-QEMU_CFLAGS="-Wall -Wundef -Wendif-labels -Wwrite-strings -Wmissing-prototypes $QEMU_CFLAGS"
-QEMU_CFLAGS="-Wstrict-prototypes -Wredundant-decls $QEMU_CFLAGS"
-QEMU_CFLAGS="-D_GNU_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE $QEMU_CFLAGS"
-QEMU_CFLAGS="-U_FORTIFY_SOURCE $QEMU_CFLAGS"
-QEMU_CFLAGS="-I. -I\$(SRC_PATH) $QEMU_CFLAGS"
-LDFLAGS="-g $LDFLAGS"
-
-gcc_flags="-Wold-style-declaration -Wold-style-definition"
-cat > $TMPC << EOF
-int main(void) { }
-EOF
-for flag in $gcc_flags; do
- if compile_prog "$QEMU_CFLAGS" "$flag" ; then
- QEMU_CFLAGS="$flag $QEMU_CFLAGS"
- fi
-done
# Consult white-list to determine whether to enable werror
# by default. Only enable by default for git builds
