Re: Improving vim startuptime

Manas <manas18244@iiitd.ac.in> wrote:

> Compilation: gcc -c -I. -Iproto -DHAVE_CONFIG_H -DFEAT_GUI_GTK -I/usr/include/gtk-3.0 -I/usr/include/pango-1.0 -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -I/usr/include/sysprof-4 -I/usr/include/harfbuzz -I/usr/include/freetype2 -I/usr/include/libpng16 -I/usr/include/libmount -I/usr/include/blkid -I/usr/include/fribidi -I/usr/include/cairo -I/usr/include/pixman-1 -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/gio-unix-2.0 -I/usr/include/cloudproviders -I/usr/include/atk-1.0 -I/usr/include/at-spi2-atk/2.0 -I/usr/include/at-spi-2.0 -I/usr/include/dbus-1.0 -I/usr/lib/dbus-1.0/include -pthread -march=x86-64 -mtune=generic -O2 -pipe -fno-plt -fexceptions -Wformat -Werror=format-security -fstack-clash-protection -fcf-protection -g -ffile-prefix-map=/build/vim/src=/usr/src/debug/vim -flto=auto -D_REENTRANT -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=1
> Linking: gcc -Wl,-E -Wl,-rpath,/usr/lib/perl5/5.36/core_perl/CORE -Wl,-O1,--sort-common,--as-needed,-z,relro,-z,now -flto=auto -L/usr/local/lib -o vim -lgtk-3 -lgdk-3 -lz -lpangocairo-1.0 -lpango-1.0 -lharfbuzz -latk-1.0 -lcairo-gobject -lcairo -lgdk_pixbuf-2.0 -lgio-2.0 -lgobject-2.0 -lglib-2.0 -lSM -lICE -lXt -lX11 -lXdmcp -lSM -lICE -lm -ltinfo -lelf -lcanberra -lacl -lattr -lgpm -Wl,-E -Wl,-rpath,/usr/lib/perl5/5.36/core_perl/CORE -Wl,-O1,--sort-common,--as-needed,-z,relro,-z,now -flto=auto -fstack-protector-strong -L/usr/local/lib -L/usr/lib/perl5/5.36/core_perl/CORE -lperl -lpthread -ldl -lm -lcrypt -lutil -lc -L/usr/lib -ltclstub8.6 -ldl -lz -lpthread -lm

I see you use:
* for compilation: -flto=auto ... -O2 (actually also -O1 but last one
overrides)
* for linking: -Wl,-O1 -flto=auto

I'm not 100% sure, but since you use LTO (Link Time Optimization),
the compilation happens at link time, so I suppose that -O1 is used
instead of -O2. Try to make sure that -Wl,-O2 is also used at link
time if you use LTO, it may help to speed up Vim significantly.

Dominique

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