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Revert "configure: Enable GCC vectorization on ≥4.9 on x86"

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This reverts commit cb8646af24.

This change has brough more issues than benefits, between compilation
time failures depending on flags used and code miscompilation causing
runtime crashes.

See the "[PATCH 2/2] configure: Enable GCC vectorization on ≥4.9"
thread in the ffmpeg-devel mailing list for the relevant discussion.
This commit is contained in:
James Almer
2016-07-09 16:00:06 -03:00
parent 3cdd5f4b7c
commit fd6dbc5385
1 changed files with 1 additions and 5 deletions
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6
configure vendored
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@@ -6139,11 +6139,7 @@ elif enabled ccc; then
add_cflags -msg_disable nonstandcast
add_cflags -msg_disable unsupieee
elif enabled gcc; then
case $gcc_basever in
4.9*) enabled x86 || check_optflags -fno-tree-vectorize ;;
4.*) check_optflags -fno-tree-vectorize ;;
*) enabled x86 || check_optflags -fno-tree-vectorize ;;
esac
check_optflags -fno-tree-vectorize
check_cflags -Werror=format-security
check_cflags -Werror=implicit-function-declaration
check_cflags -Werror=missing-prototypes