[gcc r14-5823] libcpp: configure: drop unused Valgrind detection

[gcc r14-5823] libcpp: configure: drop unused Valgrind detection

[Alexander Monakov]

https://gcc.gnu.org/g:ab78426ae76cd4a31c384f17dd058b4ad8b39642

commit r14-5823-gab78426ae76cd4a31c384f17dd058b4ad8b39642
Author: Alexander Monakov <amonakov@ispras.ru>
Date:   Thu Nov 23 13:55:43 2023 +0300

    libcpp: configure: drop unused Valgrind detection
    
    When top-level configure has either --enable-checking=valgrind or
    --enable-valgrind-annotations, we want to activate a couple of workarounds
    in libcpp. They do not use anything from the Valgrind API, so just
    delete all detection.
    
    libcpp/ChangeLog:
    
            * config.in: Regenerate.
            * configure: Regenerate.
            * configure.ac (ENABLE_VALGRIND_CHECKING): Delete.
            (ENABLE_VALGRIND_ANNOTATIONS): Rename to
            ENABLE_VALGRIND_WORKAROUNDS.  Delete Valgrind header checks.
            * lex.cc (new_buff): Adjust for renaming.
            (_cpp_free_buff): Ditto.

Diff:
---
 libcpp/config.in    | 15 +++---------
 libcpp/configure    | 70 +----------------------------------------------------
 libcpp/configure.ac | 51 +++-----------------------------------
 libcpp/lex.cc       |  4 +--
 4 files changed, 9 insertions(+), 131 deletions(-)

diff --git a/libcpp/config.in b/libcpp/config.in
index df4fd44c9ef..253ef03a3de 100644
--- a/libcpp/config.in
+++ b/libcpp/config.in
@@ -24,12 +24,9 @@
    language is requested. */
 #undef ENABLE_NLS
 
-/* Define to get calls to the valgrind runtime enabled. */
-#undef ENABLE_VALGRIND_ANNOTATIONS
-
-/* Define if you want to workaround valgrind (a memory checker) warnings about
-   possible memory leaks because of libcpp use of interior pointers. */
-#undef ENABLE_VALGRIND_CHECKING
+/* Define if you want to workaround Valgrind warnings about possible memory
+   leaks because of libcpp use of interior pointers. */
+#undef ENABLE_VALGRIND_WORKAROUNDS
 
 /* Define to 1 if you have `alloca', as a function or macro. */
 #undef HAVE_ALLOCA
@@ -201,9 +198,6 @@
 /* Define to 1 if you have the <locale.h> header file. */
 #undef HAVE_LOCALE_H
 
-/* Define if valgrind's memcheck.h header is installed. */
-#undef HAVE_MEMCHECK_H
-
 /* Define to 1 if you have the <memory.h> header file. */
 #undef HAVE_MEMORY_H
 
@@ -252,9 +246,6 @@
 /* Define to 1 if you have the <unistd.h> header file. */
 #undef HAVE_UNISTD_H
 
-/* Define if valgrind's valgrind/memcheck.h header is installed. */
-#undef HAVE_VALGRIND_MEMCHECK_H
-
 /* Define as const if the declaration of iconv() needs const. */
 #undef ICONV_CONST
 
diff --git a/libcpp/configure b/libcpp/configure
index 452e4c1f6c0..8a38c0546e3 100755
--- a/libcpp/configure
+++ b/libcpp/configure
@@ -9116,12 +9116,6 @@ $as_echo "#define ENABLE_ASSERT_CHECKING 1" >>confdefs.h
 
 fi
 
-if test x$ac_valgrind_checking != x ; then
-
-$as_echo "#define ENABLE_VALGRIND_CHECKING 1" >>confdefs.h
-
-fi
-
 # Check whether --enable-canonical-system-headers was given.
 if test "${enable_canonical_system_headers+set}" = set; then :
   enableval=$enable_canonical_system_headers;
@@ -9405,62 +9399,6 @@ case x$enable_languages in
 esac
 
 
-ac_fn_c_check_header_mongrel "$LINENO" "valgrind.h" "ac_cv_header_valgrind_h" "$ac_includes_default"
-if test "x$ac_cv_header_valgrind_h" = xyes; then :
-  have_valgrind_h=yes
-else
-  have_valgrind_h=no
-fi
-
-
-
-# It is certainly possible that there's valgrind but no valgrind.h.
-# GCC relies on making annotations so we must have both.
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for VALGRIND_DISCARD in <valgrind/memcheck.h>" >&5
-$as_echo_n "checking for VALGRIND_DISCARD in <valgrind/memcheck.h>... " >&6; }
-cat confdefs.h - <<_ACEOF >conftest.$ac_ext
-/* end confdefs.h.  */
-#include <valgrind/memcheck.h>
-#ifndef VALGRIND_DISCARD
-#error VALGRIND_DISCARD not defined
-#endif
-_ACEOF
-if ac_fn_c_try_cpp "$LINENO"; then :
-  gcc_cv_header_valgrind_memcheck_h=yes
-else
-  gcc_cv_header_valgrind_memcheck_h=no
-fi
-rm -f conftest.err conftest.i conftest.$ac_ext
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $gcc_cv_header_valgrind_memcheck_h" >&5
-$as_echo "$gcc_cv_header_valgrind_memcheck_h" >&6; }
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for VALGRIND_DISCARD in <memcheck.h>" >&5
-$as_echo_n "checking for VALGRIND_DISCARD in <memcheck.h>... " >&6; }
-cat confdefs.h - <<_ACEOF >conftest.$ac_ext
-/* end confdefs.h.  */
-#include <memcheck.h>
-#ifndef VALGRIND_DISCARD
-#error VALGRIND_DISCARD not defined
-#endif
-_ACEOF
-if ac_fn_c_try_cpp "$LINENO"; then :
-  gcc_cv_header_memcheck_h=yes
-else
-  gcc_cv_header_memcheck_h=no
-fi
-rm -f conftest.err conftest.i conftest.$ac_ext
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $gcc_cv_header_memcheck_h" >&5
-$as_echo "$gcc_cv_header_memcheck_h" >&6; }
-if test $gcc_cv_header_valgrind_memcheck_h = yes; then
-
-$as_echo "#define HAVE_VALGRIND_MEMCHECK_H 1" >>confdefs.h
-
-fi
-if test $gcc_cv_header_memcheck_h = yes; then
-
-$as_echo "#define HAVE_MEMCHECK_H 1" >>confdefs.h
-
-fi
-
 # Check whether --enable-valgrind-annotations was given.
 if test "${enable_valgrind_annotations+set}" = set; then :
   enableval=$enable_valgrind_annotations;
@@ -9470,14 +9408,8 @@ fi
 
 if test x$enable_valgrind_annotations != xno \
     || test x$ac_valgrind_checking != x; then
-  if (test $have_valgrind_h = no \
-      && test $gcc_cv_header_memcheck_h = no \
-      && test $gcc_cv_header_valgrind_memcheck_h = no); then
-    as_fn_error $? "*** valgrind annotations requested, but" "$LINENO" 5
-    as_fn_error $? "*** Can't find valgrind/memcheck.h, memcheck.h or valgrind.h" "$LINENO" 5
-  fi
 
-$as_echo "#define ENABLE_VALGRIND_ANNOTATIONS 1" >>confdefs.h
+$as_echo "#define ENABLE_VALGRIND_WORKAROUNDS 1" >>confdefs.h
 
 fi
 
diff --git a/libcpp/configure.ac b/libcpp/configure.ac
index b29b4d6acf1..b883fec776f 100644
--- a/libcpp/configure.ac
+++ b/libcpp/configure.ac
@@ -185,12 +185,6 @@ if test x$ac_assert_checking != x ; then
 [Define if you want assertions enabled.  This is a cheap check.])
 fi
 
-if test x$ac_valgrind_checking != x ; then
-  AC_DEFINE(ENABLE_VALGRIND_CHECKING, 1,
-[Define if you want to workaround valgrind (a memory checker) warnings about
- possible memory leaks because of libcpp use of interior pointers.])
-fi
-
 AC_ARG_ENABLE(canonical-system-headers,
 [  --enable-canonical-system-headers
                           enable or disable system headers canonicalization],
@@ -241,54 +235,15 @@ case x$enable_languages in
 esac
 AC_SUBST(CET_HOST_FLAGS)
 
-dnl # This check AC_REQUIREs various stuff, so it *must not* be inside
-dnl # an if statement.  This was the source of very frustrating bugs
-dnl # in converting to autoconf 2.5x!
-AC_CHECK_HEADER(valgrind.h, have_valgrind_h=yes, have_valgrind_h=no)
-
-# It is certainly possible that there's valgrind but no valgrind.h.
-# GCC relies on making annotations so we must have both.
-AC_MSG_CHECKING(for VALGRIND_DISCARD in <valgrind/memcheck.h>)
-AC_PREPROC_IFELSE([AC_LANG_SOURCE(
-  [[#include <valgrind/memcheck.h>
-#ifndef VALGRIND_DISCARD
-#error VALGRIND_DISCARD not defined
-#endif]])],
-  [gcc_cv_header_valgrind_memcheck_h=yes],
-  [gcc_cv_header_valgrind_memcheck_h=no])
-AC_MSG_RESULT($gcc_cv_header_valgrind_memcheck_h)
-AC_MSG_CHECKING(for VALGRIND_DISCARD in <memcheck.h>)
-AC_PREPROC_IFELSE([AC_LANG_SOURCE(
-  [[#include <memcheck.h>
-#ifndef VALGRIND_DISCARD
-#error VALGRIND_DISCARD not defined
-#endif]])],
-  [gcc_cv_header_memcheck_h=yes],
-  [gcc_cv_header_memcheck_h=no])
-AC_MSG_RESULT($gcc_cv_header_memcheck_h)
-if test $gcc_cv_header_valgrind_memcheck_h = yes; then
-  AC_DEFINE(HAVE_VALGRIND_MEMCHECK_H, 1,
-	[Define if valgrind's valgrind/memcheck.h header is installed.])
-fi
-if test $gcc_cv_header_memcheck_h = yes; then
-  AC_DEFINE(HAVE_MEMCHECK_H, 1,
-	[Define if valgrind's memcheck.h header is installed.])
-fi
-
 AC_ARG_ENABLE(valgrind-annotations,
 [AS_HELP_STRING([--enable-valgrind-annotations],
 		[enable valgrind runtime interaction])], [],
 [enable_valgrind_annotations=no])
 if test x$enable_valgrind_annotations != xno \
     || test x$ac_valgrind_checking != x; then
-  if (test $have_valgrind_h = no \
-      && test $gcc_cv_header_memcheck_h = no \
-      && test $gcc_cv_header_valgrind_memcheck_h = no); then
-    AC_MSG_ERROR([*** valgrind annotations requested, but])
-    AC_MSG_ERROR([*** Can't find valgrind/memcheck.h, memcheck.h or valgrind.h])
-  fi
-  AC_DEFINE(ENABLE_VALGRIND_ANNOTATIONS, 1,
-[Define to get calls to the valgrind runtime enabled.])
+  AC_DEFINE(ENABLE_VALGRIND_WORKAROUNDS, 1,
+[Define if you want to workaround Valgrind warnings about
+ possible memory leaks because of libcpp use of interior pointers.])
 fi
 
 # Output.
diff --git a/libcpp/lex.cc b/libcpp/lex.cc
index 0b1b93609ef..a5d2f31e766 100644
--- a/libcpp/lex.cc
+++ b/libcpp/lex.cc
@@ -4762,7 +4762,7 @@ new_buff (size_t len)
     len = MIN_BUFF_SIZE;
   len = CPP_ALIGN (len);
 
-#ifdef ENABLE_VALGRIND_ANNOTATIONS
+#ifdef ENABLE_VALGRIND_WORKAROUNDS
   /* Valgrind warns about uses of interior pointers, so put _cpp_buff
      struct first.  */
   size_t slen = CPP_ALIGN2 (sizeof (_cpp_buff), 2 * DEFAULT_ALIGNMENT);
@@ -4859,7 +4859,7 @@ _cpp_free_buff (_cpp_buff *buff)
   for (; buff; buff = next)
     {
       next = buff->next;
-#ifdef ENABLE_VALGRIND_ANNOTATIONS
+#ifdef ENABLE_VALGRIND_WORKAROUNDS
       free (buff);
 #else
       free (buff->base);