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| author | Kang-Che Sung <explorer09@gmail.com> | 2017-01-05 09:25:03 +0800 |
|---|---|---|
| committer | Denys Vlasenko <vda.linux@googlemail.com> | 2017-01-09 18:52:32 +0100 |
| commit | f10f7a21d40d5ce0846414973e88602a59d4580e (patch) | |
| tree | 5175d6320513012ed73c1836a78440f086205b03 /util-linux/pivot_root.c | |
| parent | 61a91af63dbc91f85058efda5c542dfc859ab1be (diff) | |
| download | busybox-f10f7a21d40d5ce0846414973e88602a59d4580e.tar.gz | |
Allow FAST_FUNC to be overridden at build time
Busybox uses FAST_FUNC macro to tweak with IA-32 calling conventions in
order to make the function call slightly smaller or slightly faster.
However, when I experiment with GCC's LTO (Link Time Optimization), I
discovered that FAST_FUNC could hinder LTO's optimization so that the
resulting executable become a few bytes larger (than what is compiled
without FAST_FUNC).
This change allows to specify e.g.
CONFIG_EXTRA_CFLAGS="-DFAST_FUNC= -flto"
and compile with LTO without a source code hack.
Signed-off-by: Kang-Che Sung <explorer09@gmail.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'util-linux/pivot_root.c')
0 files changed, 0 insertions, 0 deletions