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From: "Felix.Riemann at sma dot de" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug build/29698] New: Configuring for AArch32 on ARMv8+ disables
 optimizations
Date: Tue, 18 Oct 2022 15:13:56 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
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X-Bugzilla-Product: glibc
X-Bugzilla-Component: build
X-Bugzilla-Version: 2.37
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X-Bugzilla-Severity: normal
X-Bugzilla-Who: Felix.Riemann at sma dot de
X-Bugzilla-Status: UNCONFIRMED
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X-Bugzilla-Priority: P2
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D29698

            Bug ID: 29698
           Summary: Configuring for AArch32 on ARMv8+ disables
                    optimizations
           Product: glibc
           Version: 2.37
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: build
          Assignee: unassigned at sourceware dot org
          Reporter: Felix.Riemann at sma dot de
                CC: carlos at redhat dot com
  Target Milestone: ---

Configuring glibc for ARM AArch32 with a compiler that optimizes for ARMv8
causes configure to misdetect the target and disable all optimizations/fall
back on ARMv5:

$ CFLAGS=3D"-O2 -march=3Darmv8-a" ../configure --prefix=3D/usr
--host=3Darm-linux-gnueabi
configure: loading site script /usr/share/site/x86_64-unknown-linux-gnu
checking build system type... x86_64-pc-linux-gnu
checking host system type... arm-unknown-linux-gnueabi
checking for arm-linux-gnueabi-gcc... arm-linux-gnueabi-gcc
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether arm-linux-gnueabi-gcc accepts -g... yes
checking for gcc... gcc
checking for arm-linux-gnueabi-readelf... arm-linux-gnueabi-readelf
checking for arm-linux-gnueabi-g++... arm-linux-gnueabi-g++
checking whether we are using the GNU C++ compiler... yes
checking whether arm-linux-gnueabi-g++ accepts -g... yes
checking whether arm-linux-gnueabi-g++ can link programs... yes
checking for sysdeps preconfigure fragments... aarch64 alpha arc arm config=
ure:
WARNING: arm/preconfigure: Did not find ARM architecture type; using default

This is due to the glob in sysdeps/arm/preconfigure.ac being underquoted so
that m4 will remove the brackets for ARMv8/v9. I'll send a patch shortly.

I picked 2.37 as it is reproducable on git master but I could reproduce it =
in
versions going back to at least 2.28.

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