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From: "sujay1844 at protonmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug jit/100207] -Werror=format-security error in AUR build of
 libgccjit
Date: Thu, 22 Apr 2021 15:27:20 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100207

--- Comment #15 from sujay1844 at protonmail dot com ---
I did some digging and found this:-

I checked my timeshift snapshot (which I took just after installation). The
etc/makepkg.conf is that goes like so:-

#-- Compiler and Linker Flags
CPPFLAGS=3D"-D_FORTIFY_SOURCE=3D2"
CFLAGS=3D"-march=3Dx86-64 -mtune=3Dgeneric -O2 -pipe -fno-plt"
CXXFLAGS=3D"-march=3Dx86-64 -mtune=3Dgeneric -O2 -pipe -fno-plt"
LDFLAGS=3D"-Wl,-O1,--sort-common,--as-needed,-z,relro,-z,now"
#RUSTFLAGS=3D"-C opt-level=3D2"
#-- Make Flags: change this for DistCC/SMP systems
#MAKEFLAGS=3D"-j2"
#-- Debugging flags
DEBUG_CFLAGS=3D"-g -fvar-tracking-assignments"
DEBUG_CXXFLAGS=3D"-g -fvar-tracking-assignments"
#DEBUG_RUSTFLAGS=3D"-C debuginfo=3D2"


To be sure that this is safe, I installed Manjaro in a virtual machine.
(Clearly, the guys at Manjaro know more about security than me) The
/etc/makepkg.conf had the same thing as in my timeshift snapshot. So I conc=
lude
that removing those unwanted flags are safe. I also checked the ArchWiki
article on makepkg and made some tweaks to improve performance and this is =
my
current /etc/makepkg.conf looks like:-

#-- Compiler and Linker Flags
CPPFLAGS=3D"-D_FORTIFY_SOURCE=3D2"
CFLAGS=3D"-march=3Dx86-64 -mtune=3Dgeneric -O2 -pipe -fno-plt"
CXXFLAGS=3D"-march=3Dx86-64 -mtune=3Dgeneric -O2 -pipe -fno-plt"
LDFLAGS=3D"-Wl,-O1,--sort-common,--as-needed,-z,relro,-z,now"
#RUSTFLAGS=3D"-C opt-level=3D2"
#-- Make Flags: change this for DistCC/SMP systems
#MAKEFLAGS=3D"-j2"
#-- Debugging flags
DEBUG_CFLAGS=3D"-g -fvar-tracking-assignments"
DEBUG_CXXFLAGS=3D"-g -fvar-tracking-assignments"
#DEBUG_RUSTFLAGS=3D"-C debuginfo=3D2"


Thank you for your valuable time!!
Please give any suggestions if any.
And you can close this bug.=