diff options
| author | Yann E. MORIN <yann.morin.1998@free.fr> | 2014-12-21 14:00:25 +0100 |
|---|---|---|
| committer | Thomas Petazzoni <thomas.petazzoni@free-electrons.com> | 2014-12-21 22:04:59 +0100 |
| commit | 01c34b38a4181a3b82f7507546dc97619b4246ed (patch) | |
| tree | e5c1554a31463fee64a9186814b362558c6990cb /toolchain/toolchain-common.in | |
| parent | c56dc003c1ea6dd91e466f7714d05cd1a9452a20 (diff) | |
| download | buildroot-01c34b38a4181a3b82f7507546dc97619b4246ed.tar.gz buildroot-01c34b38a4181a3b82f7507546dc97619b4246ed.zip | |
toolchain: get rid of -pipe from optimisations
-pipe is causing some build failures in Linux kernel >= 3.17.
Also, nowadays, using -pipe does not gain as much as it used to back in
the days:
Measurements made with a 3.16.7 Linux kernel:
make linux-depends
time sh -c 'make linux-build >/dev/null 2>&1'
Without -pipe:
716.32user 54.44system 3:42.12elapsed 346%CPU
721.22user 54.47system 3:41.81elapsed 349%CPU
722.44user 54.00system 3:42.13elapsed 349%CPU
721.03user 53.81system 3:41.92elapsed 349%CPU
713.21user 53.63system 3:40.51elapsed 347%CPU
706.67user 52.42system 3:38.40elapsed 347%CPU
714.40user 53.18system 3:40.16elapsed 348%CPU
706.01user 53.09system 3:37.87elapsed 348%CPU
705.98user 53.01system 3:38.03elapsed 348%CPU
714.17user 53.55system 3:39.98elapsed 348%CPU
Average: 3:40.29elapsed
With -pipe:
720.13user 53.90system 3:41.98elapsed 348%CPU
713.38user 53.69system 3:40.44elapsed 347%CPU
711.60user 52.81system 3:39.06elapsed 348%CPU
708.66user 53.09system 3:38.59elapsed 348%CPU
711.76user 53.00system 3:38.48elapsed 350%CPU
717.85user 53.97system 3:41.77elapsed 348%CPU
716.77user 53.77system 3:40.91elapsed 348%CPU
717.48user 53.65system 3:41.24elapsed 348%CPU
721.44user 55.67system 3:43.45elapsed 347%CPU
724.61user 55.63system 3:43.35elapsed 349%CPU
Average: 3:40.93elapsed
The delta is well in the measurement noise.
Just get rid of it.
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Romain Naour <romain.naour@openwide.fr>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Diffstat (limited to 'toolchain/toolchain-common.in')
| -rw-r--r-- | toolchain/toolchain-common.in | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/toolchain/toolchain-common.in b/toolchain/toolchain-common.in index b2468341ff..2ee2019ac1 100644 --- a/toolchain/toolchain-common.in +++ b/toolchain/toolchain-common.in @@ -122,7 +122,7 @@ config BR2_USE_MMU config BR2_TARGET_OPTIMIZATION string "Target Optimizations" - default "-pipe" + default "" help Optimizations to use when building for the target host. NOTE: gcc optimization level is defined in build options. |
