Deprecate most of debug-memory

Fixes #8322

The leak-checking (and backtrace option, on some platforms) provided
by crypto-mdebug and crypto-mdebug-backtrace have been mostly neutered;
only the "make malloc fail" capability remains.  OpenSSL recommends using
the compiler's leak-detection instead.

The OPENSSL_DEBUG_MEMORY environment variable is no longer used.
CRYPTO_mem_ctrl(), CRYPTO_set_mem_debug(), CRYPTO_mem_leaks(),
CRYPTO_mem_leaks_fp() and CRYPTO_mem_leaks_cb() return a failure code.
CRYPTO_mem_debug_{malloc,realloc,free}() have been removed.  All of the
above are now deprecated.

Merge (now really small) mem_dbg.c into mem.c

Reviewed-by: Paul Dale <paul.dale@oracle.com>
Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/10572)

1 files changed, 1 insertions, 18 deletions

diff --git a/Configure b/Configure
index e303d98deb..111c43061b 100755
--- a/Configure
+++ b/Configure
@@ -170,10 +170,6 @@ my @cl_devteam_warn = qw(
     /WX
 );
 
-# This adds backtrace information to the memory leak info.  Is only used
-# when crypto-mdebug-backtrace is enabled.
-my $memleak_devteam_backtrace = "-rdynamic";
-
 my $strict_warnings = 0;
 
 # As for $BSDthreads. Idea is to maintain "collective" set of flags,
@@ -345,7 +341,6 @@ my @dtls = qw(dtls1 dtls1_2);
 # For developers: keep it sorted alphabetically
 
 my @disablables = (
-    "ktls",
     "afalgeng",
     "aria",
     "asan",
@@ -392,6 +387,7 @@ my @disablables = (
     "fuzz-afl",
     "gost",
     "idea",
+    "ktls",
     "legacy",
     "makedepend",
     "md2",
@@ -1517,19 +1513,6 @@ $config{CFLAGS} = [ map { $_ eq '--ossl-strict-warnings'
                               : ( $_ ) }
                     @{$config{CFLAGS}} ];
 
-unless ($disabled{"crypto-mdebug-backtrace"})
-        {
-        foreach my $wopt (split /\s+/, $memleak_devteam_backtrace)
-                {
-                push @{$config{cflags}}, $wopt
-                        unless grep { $_ eq $wopt } @{$config{cflags}};
-                }
-        if ($target =~ /^BSD-/)
-                {
-                push @{$config{ex_libs}}, "-lexecinfo";
-                }
-        }
-
 unless ($disabled{afalgeng}) {
     $config{afalgeng}="";
     if (grep { $_ eq 'afalgeng' } @{$target{enable}}) {