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Code Issues Releases Activity

Check for may_alias gcc attribute support

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Originally committed as revision 21522 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Måns Rullgård 2010-01-29 03:26:12 +00:00
parent 68a4d3498f
commit dffb41b953
1 changed files with 5 additions and 0 deletions
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5
configure vendored
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@ -985,6 +985,7 @@ HAVE_LIST="
alsa_asoundlib_h alsa_asoundlib_h
altivec_h altivec_h
arpa_inet_h arpa_inet_h
attribute_may_alias
attribute_packed attribute_packed
bswap bswap
closesocket closesocket
@ -2298,6 +2299,10 @@ check_cc <<EOF && enable attribute_packed
struct { int x; } __attribute__((packed)) x; struct { int x; } __attribute__((packed)) x;
EOF EOF
check_cc <<EOF && enable attribute_may_alias
union { int x; } __attribute__((may_alias)) x;
EOF
check_cc <<EOF || die "endian test failed" check_cc <<EOF || die "endian test failed"
unsigned int endian = 'B' << 24 | 'I' << 16 | 'G' << 8 | 'E'; unsigned int endian = 'B' << 24 | 'I' << 16 | 'G' << 8 | 'E';
EOF EOF