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bug#65988: 30.0.50; Emacs and -O3 compiler optimization
From: |
Eli Zaretskii |
Subject: |
bug#65988: 30.0.50; Emacs and -O3 compiler optimization |
Date: |
Fri, 15 Sep 2023 14:29:38 +0300 |
> From: Arash Esbati <arash@gnu.org>
> Date: Fri, 15 Sep 2023 11:22:36 +0200
>
> Presuming that the note above applies to GCC on all platforms, I suggest
> to change/adjust the following example in INSTALL[2]:
>
> Here's an example of a 'configure' invocation, assuming a Bourne-like
> shell such as Bash, which uses these variables:
>
> ./configure \
> CPPFLAGS='-I/foo/myinclude' LDFLAGS='-L/bar/mylib' \
> CFLAGS='-O3' LIBS='-lfoo -lbar'
>
> (this is all one shell command). This tells 'configure' to instruct the
> preprocessor to look in the '/foo/myinclude' directory for header
> files (in addition to the standard directories), instruct the linker
> to look in '/bar/mylib' for libraries, pass the -O3 optimization
> switch to the compiler, and link against libfoo and libbar
> libraries in addition to the standard ones.
>
> IIRC this was the place where I picked up the -O3 switch for the script
> I wrote for building Emacs.
You really shouldn't treat what's in INSTALL so literally: it's just
an example to illustrate how to use these switches.
I changed it not to use -O3.