[glibc] sysdeps: arm: Fix preconfigure script for ARMv8/v9 targets [BZ #29698]

[Adhemerval Zanella <azanella@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=a885fc2d6897d3baa438e2594a92f0125f1258a9

commit a885fc2d6897d3baa438e2594a92f0125f1258a9
Author: Felix Riemann <felix.riemann@sma.de>
Date:   Tue Oct 18 17:20:44 2022 +0200

    sysdeps: arm: Fix preconfigure script for ARMv8/v9 targets [BZ #29698]
    
    The ARM preconfigure script tries to detect the capabilities of the
    target platform by checking the compiler's predefined architecture
    macros. However, if the compiler is tuning for AArch32 on ARMv8/v9 this
    step fails:
    
    checking for sysdeps preconfigure fragments... aarch64 alpha arc arm
    WARNING: arm/preconfigure: Did not find ARM architecture type; using default
    
    This is because preconfigure.ac doesn't escape the square brackets in
    the glob for matching compilers targeting ARMv8. Adding another pair of
    brackets to escape the first pair fixes this:
    
    checking for sysdeps preconfigure fragments... aarch64 alpha arc arm
     Found compiler is configured for something newer than v7 - using v7
    
    Signed-off-by: Felix Riemann <felix.riemann@sma.de>
    Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

Diff:
---
 sysdeps/arm/preconfigure    | 2 +-
 sysdeps/arm/preconfigure.ac | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/sysdeps/arm/preconfigure b/sysdeps/arm/preconfigure
index e95c988f29..326bede5b5 100644
--- a/sysdeps/arm/preconfigure
+++ b/sysdeps/arm/preconfigure
@@ -22,7 +22,7 @@ arm*)
     sed -n 's/^#define \(__ARM_ARCH_[0-9].*__\) .*$/\1/p'`
 
   case "x$archcppflag" in
-  x__ARM_ARCH_89*__)
+  x__ARM_ARCH_[89]*__)
     machine=armv7
     { $as_echo "$as_me:${as_lineno-$LINENO}: Found compiler is configured for something newer than v7 - using v7" >&5
 $as_echo "$as_me: Found compiler is configured for something newer than v7 - using v7" >&6;}
diff --git a/sysdeps/arm/preconfigure.ac b/sysdeps/arm/preconfigure.ac
index a523b4fb4c..a707385263 100644
--- a/sysdeps/arm/preconfigure.ac
+++ b/sysdeps/arm/preconfigure.ac
@@ -22,7 +22,7 @@ arm*)
     sed -n 's/^#define \(__ARM_ARCH_[0-9].*__\) .*$/\1/p'`
 
   case "x$archcppflag" in
-  x__ARM_ARCH_[89]*__)
+  x__ARM_ARCH_[[89]]*__)
     machine=armv7
     AC_MSG_NOTICE([Found compiler is configured for something newer than v7 - using v7])
     ;;