Check for may_alias gcc attribute support

Originally committed as revision 21522 to svn://svn.ffmpeg.org/ffmpeg/trunk
15 years ago · dffb41b953
parent 68a4d3498f
commit dffb41b953
1 changed files with 5 additions and 0 deletions
--- a/5
+++ b/5
@ -985,6 +985,7 @@ HAVE_LIST="
    alsa_asoundlib_h
    altivec_h
    arpa_inet_h
+    attribute_may_alias
    attribute_packed
    bswap
    closesocket
@ -2298,6 +2299,10 @@ check_cc <<EOF && enable attribute_packed
 struct { int x; } __attribute__((packed)) x;
 EOF

+check_cc <<EOF && enable attribute_may_alias
+union { int x; } __attribute__((may_alias)) x;
+EOF
+
 check_cc <<EOF || die "endian test failed"
 unsigned int endian = 'B' << 24 | 'I' << 16 | 'G' << 8 | 'E';
 EOF