[committed] libstdc++: Print assertion messages to stderr [PR59675]

[Jonathan Wakely <jwakely@redhat.com>]

This replaces the printf used by failed debug assertions with fprintf,
so we can write to stderr.

To avoid including <stdio.h> the assert function is moved into the
library. To avoid programs using a vague linkage definition of the old
inline function, the function is renamed. Code compiled with old
versions of GCC might still call the old function, but code compiled
with the newer GCC will call the new function and write to stderr.

libstdc++-v3/ChangeLog:

	PR libstdc++/59675
	* acinclude.m4 (libtool_VERSION): Bump version.
	* config/abi/pre/gnu.ver (GLIBCXX_3.4.30): Add version and
	export new symbol.
	* configure: Regenerate.
	* include/bits/c++config (__replacement_assert): Remove, declare
	__glibcxx_assert_fail instead.
	* src/c++11/debug.cc (__glibcxx_assert_fail): New function to
	replace __replacement_assert, writing to stderr instead of
	stdout.
	* testsuite/util/testsuite_abi.cc: Update latest version.
---
 libstdc++-v3/acinclude.m4                    |  2 +-
 libstdc++-v3/config/abi/pre/gnu.ver          |  6 +++++
 libstdc++-v3/configure                       |  2 +-
 libstdc++-v3/include/bits/c++config          | 27 ++++++++------------
 libstdc++-v3/src/c++11/debug.cc              | 18 ++++++++++++-
 libstdc++-v3/testsuite/util/testsuite_abi.cc |  3 ++-
 6 files changed, 38 insertions(+), 20 deletions(-)

diff --git a/libstdc++-v3/acinclude.m4 b/libstdc++-v3/acinclude.m4
index 497af5723e1..4adfdf646ac 100644
--- a/libstdc++-v3/acinclude.m4
+++ b/libstdc++-v3/acinclude.m4
@@ -3798,7 +3798,7 @@ changequote([,])dnl
 fi
 
 # For libtool versioning info, format is CURRENT:REVISION:AGE
-libtool_VERSION=6:29:0
+libtool_VERSION=6:30:0
 
 # Everything parsed; figure out what files and settings to use.
 case $enable_symvers in
diff --git a/libstdc++-v3/config/abi/pre/gnu.ver b/libstdc++-v3/config/abi/pre/gnu.ver
index 5323c7f0604..8f3c7b3827e 100644
--- a/libstdc++-v3/config/abi/pre/gnu.ver
+++ b/libstdc++-v3/config/abi/pre/gnu.ver
@@ -2397,6 +2397,12 @@ GLIBCXX_3.4.29 {
 
 } GLIBCXX_3.4.28;
 
+GLIBCXX_3.4.30 {
+
+    _ZSt21__glibcxx_assert_fail*;
+
+} GLIBCXX_3.4.29;
+
 # Symbols in the support library (libsupc++) have their own tag.
 CXXABI_1.3 {
 
diff --git a/libstdc++-v3/configure b/libstdc++-v3/configure
index 21371031b66..3a572475546 100755
--- a/libstdc++-v3/configure
+++ b/libstdc++-v3/configure
@@ -74892,7 +74892,7 @@ $as_echo "$as_me: WARNING: === Symbol versioning will be disabled." >&2;}
 fi
 
 # For libtool versioning info, format is CURRENT:REVISION:AGE
-libtool_VERSION=6:29:0
+libtool_VERSION=6:30:0
 
 # Everything parsed; figure out what files and settings to use.
 case $enable_symvers in
diff --git a/libstdc++-v3/include/bits/c++config b/libstdc++-v3/include/bits/c++config
index a6495809671..4b7fa659300 100644
--- a/libstdc++-v3/include/bits/c++config
+++ b/libstdc++-v3/include/bits/c++config
@@ -526,22 +526,17 @@ namespace std
   // Avoid the use of assert, because we're trying to keep the <cassert>
   // include out of the mix.
   extern "C++" _GLIBCXX_NORETURN
-  inline void
-  __replacement_assert(const char* __file, int __line,
-		       const char* __function, const char* __condition)
-  _GLIBCXX_NOEXCEPT
-  {
-    __builtin_printf("%s:%d: %s: Assertion '%s' failed.\n", __file, __line,
-		     __function, __condition);
-    __builtin_abort();
-  }
+  void
+  __glibcxx_assert_fail(const char* __file, int __line,
+			const char* __function, const char* __condition)
+  _GLIBCXX_NOEXCEPT;
 }
-#define __glibcxx_assert_impl(_Condition)			       \
-  if (__builtin_expect(!bool(_Condition), false))		       \
-  {								       \
-    __glibcxx_constexpr_assert(false);				       \
-    std::__replacement_assert(__FILE__, __LINE__, __PRETTY_FUNCTION__, \
-			      #_Condition);			       \
+#define __glibcxx_assert_impl(_Condition)				\
+  if (__builtin_expect(!bool(_Condition), false))			\
+  {									\
+    __glibcxx_constexpr_assert(false);					\
+    std::__glibcxx_assert_fail(__FILE__, __LINE__, __PRETTY_FUNCTION__,	\
+			       #_Condition);				\
   }
 # else // ! VERBOSE_ASSERT
 # define __glibcxx_assert_impl(_Condition)		\
@@ -550,7 +545,7 @@ namespace std
     __glibcxx_constexpr_assert(false);			\
     __builtin_abort();					\
   }
-#endif
+# endif
 #endif
 
 #if defined(_GLIBCXX_ASSERTIONS)
diff --git a/libstdc++-v3/src/c++11/debug.cc b/libstdc++-v3/src/c++11/debug.cc
index 0128535135e..77cb2a2c7ed 100644
--- a/libstdc++-v3/src/c++11/debug.cc
+++ b/libstdc++-v3/src/c++11/debug.cc
@@ -33,7 +33,8 @@
 #include <debug/vector>
 
 #include <cassert>
-#include <cstdio>
+#include <cstdio>	// for std::fprintf, stderr
+#include <cstdlib>	// for std::abort
 #include <cctype>	// for std::isspace.
 #include <cstring>	// for std::strstr.
 
@@ -43,6 +44,21 @@
 
 #include "mutex_pool.h"
 
+#ifdef _GLIBCXX_VERBOSE_ASSERT
+namespace std
+{
+  [[__noreturn__]]
+  void
+  __glibcxx_assert_fail(const char* file, int line,
+			const char* function, const char* condition) noexcept
+  {
+    fprintf(stderr, "%s:%d: %s: Assertion '%s' failed.\n",
+		      file, line, function, condition);
+    abort();
+  }
+}
+#endif
+
 using namespace std;
 
 namespace
diff --git a/libstdc++-v3/testsuite/util/testsuite_abi.cc b/libstdc++-v3/testsuite/util/testsuite_abi.cc
index 3af5dc593c2..1ca7da4fcd0 100644
--- a/libstdc++-v3/testsuite/util/testsuite_abi.cc
+++ b/libstdc++-v3/testsuite/util/testsuite_abi.cc
@@ -210,6 +210,7 @@ check_version(symbol& test, bool added)
       known_versions.push_back("GLIBCXX_3.4.27");
       known_versions.push_back("GLIBCXX_3.4.28");
       known_versions.push_back("GLIBCXX_3.4.29");
+      known_versions.push_back("GLIBCXX_3.4.30");
       known_versions.push_back("GLIBCXX_LDBL_3.4.29");
       known_versions.push_back("GLIBCXX_IEEE128_3.4.29");
       known_versions.push_back("CXXABI_1.3");
@@ -245,7 +246,7 @@ check_version(symbol& test, bool added)
 	test.version_status = symbol::incompatible;
 
       // Check that added symbols are added in the latest pre-release version.
-      bool latestp = (test.version_name == "GLIBCXX_3.4.29"
+      bool latestp = (test.version_name == "GLIBCXX_3.4.30"
 	  // XXX remove next 3 lines when baselines have been regenerated
 	  // to include {IEEE128,LDBL} symbols:
 		     || test.version_name == "GLIBCXX_LDBL_3.4.29"
-- 
2.31.1