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

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This reverts commit cb8646af24bd8e9627cc5e1c62b049a00fe0b07b.

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.

(cherry picked from commit fd6dbc53855fbfc9a782095d0ffe11dd3a98905f)
This commit is contained in:
James Almer 2016-07-09 16:00:06 -03:00
parent 96f5019bde
commit 4774eb8128
1 changed files with 1 additions and 5 deletions
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6
configure vendored
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@ -5923,11 +5923,7 @@ 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