[gcc r13-1242] libstdc++: use grep -E instead of egrep in scripts

[gcc r13-1242] libstdc++: use grep -E instead of egrep in scripts

[Xi Ruoyao]

https://gcc.gnu.org/g:fa4e97907fc979f550c3f02cde03d9c35f99df9b

commit r13-1242-gfa4e97907fc979f550c3f02cde03d9c35f99df9b
Author: Xi Ruoyao <xry111@xry111.site>
Date:   Fri Jun 24 15:02:23 2022 +0800

    libstdc++: use grep -E instead of egrep in scripts
    
    egrep has been deprecated in favor of grep -E for a long time, and the
    next grep release (3.8 or 4.0) will print a warning of egrep is used.
    Stop using egrep so we won't see the warning.
    
    grep's from GNU, BSD (including Mac OS X), AIX, BusyBox all support -E
    and -F.  Solaris grep doesn't support -E, but extract_symvers.in already
    contains a special case for Solaris and doxygen documentation generation
    is already broken on non-GNU.
    
    libstdc++-v3/ChangeLog:
    
            * scripts/extract_symvers.in: Use grep -E instead of egrep.
            * scripts/run_doxygen: Likewise.

Diff:
---
 libstdc++-v3/scripts/extract_symvers.in | 4 ++--
 libstdc++-v3/scripts/run_doxygen        | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/libstdc++-v3/scripts/extract_symvers.in b/libstdc++-v3/scripts/extract_symvers.in
index dd9f63d4f16..d8ea62355ae 100755
--- a/libstdc++-v3/scripts/extract_symvers.in
+++ b/libstdc++-v3/scripts/extract_symvers.in
@@ -54,8 +54,8 @@ SunOS)
   ${readelf} ${lib} |\
   sed -e 's/ \[<other>: [A-Fa-f0-9]*\] //' -e '/\.dynsym/,/^$/p;d' |\
   sed -e 's/ \[<localentry>: [0-9]*\] //' |\
-  egrep -v ' (LOCAL|UND) ' |\
-  egrep -v ' (_DYNAMIC|_GLOBAL_OFFSET_TABLE_|_PROCEDURE_LINKAGE_TABLE_|_edata|_end|_etext)$' |\
+  grep -E -v ' (LOCAL|UND) ' |\
+  grep -E -v ' (_DYNAMIC|_GLOBAL_OFFSET_TABLE_|_PROCEDURE_LINKAGE_TABLE_|_edata|_end|_etext)$' |\
   sed -e 's/ <processor specific>: / <processor_specific>:_/g' |\
   sed -e 's/ <OS specific>: / <OS_specific>:_/g' |\
   sed -e 's/ <unknown>: / <unknown>:_/g' |\
diff --git a/libstdc++-v3/scripts/run_doxygen b/libstdc++-v3/scripts/run_doxygen
index 86da071d86c..50514c744c9 100644
--- a/libstdc++-v3/scripts/run_doxygen
+++ b/libstdc++-v3/scripts/run_doxygen
@@ -291,7 +291,7 @@ cxxflags="-Og -g -std=gnu++23"
 $gxx $cppflags $cxxflags ${srcdir}/doc/doxygen/stdheader.cc -o ./stdheader || exit 1
 # Doxygen outputs something like "\fC#include <unique_lock\&.h>\fP" and
 # we want that internal header to be replaced with something like <mutex>.
-problematic=`egrep -l '#include <.*h>' [a-z]*.3`
+problematic=`grep -E -l '#include <.*h>' [a-z]*.3`
 for f in $problematic; do
     # this is also slow, but safe and easy to debug
     oldh=`sed -n '/fC#include </s/.*<\(.*\)>.*/\1/p' $f`
@@ -303,7 +303,7 @@ rm stdheader
 # Some of the pages for generated modules have text that confuses certain
 # implementations of man(1), e.g. on GNU/Linux.  We need to have another
 # top-level *roff tag to /stop/ the .SH NAME entry.
-problematic=`egrep --files-without-match '^\.SH SYNOPSIS' [A-Z]*.3`
+problematic=`grep -E --files-without-match '^\.SH SYNOPSIS' [A-Z]*.3`
 #problematic='Containers.3 Sequences.3 Assoc_containers.3 Iterator_types.3'
 
 for f in $problematic; do