Commit 93b25869 authored by John Snow's avatar John Snow Committed by Stefan Hajnoczi
Browse files

configure: factor out supported flag check 



Factor out the function that checks if a compiler
flag is supported or not.

Signed-off-by: default avatarJohn Snow <jsnow@redhat.com>
Reviewed-by: default avatarStefan Hajnoczi <stefanha@redhat.com>
Message-id: 1427324259-1481-3-git-send-email-jsnow@redhat.com
Signed-off-by: default avatarStefan Hajnoczi <stefanha@redhat.com>
parent e4a7b344

configure

+19 −14
Original line number Diff line number Diff line
@@ -436,6 +436,12 @@ EOF 
  compile_object

}



write_c_skeleton() {

    cat > $TMPC <<EOF

int main(void) { return 0; }

EOF

}



if check_define __linux__ ; then

  targetos="Linux"

elif check_define _WIN32 ; then
@@ -705,9 +711,7 @@ if test "$mingw32" = "yes" ; then 
  # enable C99/POSIX format strings (needs mingw32-runtime 3.15 or later)

  QEMU_CFLAGS="-D__USE_MINGW_ANSI_STDIO=1 $QEMU_CFLAGS"

  LIBS="-lwinmm -lws2_32 -liphlpapi $LIBS"

cat > $TMPC << EOF

int main(void) { return 0; }

EOF

  write_c_skeleton;

  if compile_prog "" "-liberty" ; then

    LIBS="-liberty $LIBS"

  fi
@@ -1445,10 +1449,7 @@ if test -z "$werror" ; then 
fi



# check that the C compiler works.

cat > $TMPC <<EOF

int main(void) { return 0; }

EOF



write_c_skeleton;

if compile_object ; then

  : C compiler works ok

else
@@ -1496,15 +1497,19 @@ gcc_flags="-Wno-string-plus-int $gcc_flags" 
# enable it for all configure tests. If a configure test failed due

# to -Werror this would just silently disable some features,

# so it's too error prone.

cat > $TMPC << EOF

int main(void) { return 0; }

EOF

for flag in $gcc_flags; do



cc_has_warning_flag() {

    write_c_skeleton;



    # Use the positive sense of the flag when testing for -Wno-wombat

    # support (gcc will happily accept the -Wno- form of unknown

    # warning options).

    optflag="$(echo $flag | sed -e 's/^-Wno-/-W/')"

    if compile_prog "-Werror $optflag" "" ; then

    optflag="$(echo $1 | sed -e 's/^-Wno-/-W/')"

    compile_prog "-Werror $optflag" ""

}



for flag in $gcc_flags; do

    if cc_has_warning_flag $flag ; then

        QEMU_CFLAGS="$QEMU_CFLAGS $flag"

    fi

done