Turn MALLOC_PRODUCTION into a regular src.conf(5) option

For historical reasons, defining MALLOC_PRODUCTION in /etc/make.conf has
been used to turn off potentially expensive debug checks and statistics
gathering in the implementation of malloc(3).

It seems more consistent to turn this into a regular src.conf(5) option,
e.g. WITH_MALLOC_PRODUCTION / WITHOUT_MALLOC_PRODUCTION. This can then
be toggled similar to any other source build option, and turned on or
off by default for e.g. stable branches.

Reviewed by:	imp, #manpages
MFC after:	1 week
Differential Revision: https://reviews.freebsd.org/D26337

UPDATING

@@ -22,9 +22,9 @@ NOTE TO PEOPLE WHO THINK THAT FreeBSD 13.x IS SLOW:
 	debugging flags in userland, and various verbose features in the
 	kernel.  Many developers choose to disable these features on build
 	machines to maximize performance.  (To completely disable malloc
-	debugging, define MALLOC_PRODUCTION in /etc/make.conf, or to merely
-	disable the most expensive debugging functionality run
-	"ln -s 'abort:false,junk:false' /etc/malloc.conf".)
+	debugging, define WITH_MALLOC_PRODUCTION in /etc/src.conf and rebuild
+	world, or to merely disable the most expensive debugging functionality
+	at runtime, run "ln -s 'abort:false,junk:false' /etc/malloc.conf".)
 
 20200824:
 	OpenZFS support has been integrated. Do not upgrade root pools until

contrib/jemalloc/FREEBSD-diffs

@@ -14,7 +14,7 @@ index 7fecda7c..d5ca5e86 100644
 +    <option>--with-malloc-conf=abort_conf:false</option>.
 +    Additionally, <option>--enable-debug</option> is enabled in development
 +    versions of FreeBSD (controlled by the
-+    <constant>MALLOC_PRODUCTION</constant> make variable).</para>
++    <constant>MK_MALLOC_PRODUCTION</constant> make variable).</para>
 +
    </refsect1>
    <refsynopsisdiv>

contrib/jemalloc/doc/jemalloc.3

@@ -43,7 +43,7 @@ The following configuration options are enabled in libc\*(Aqs built\-in jemalloc
 \fB\-\-with\-malloc\-conf=abort_conf:false\fR\&. Additionally,
 \fB\-\-enable\-debug\fR
 is enabled in development versions of FreeBSD (controlled by the
-\fBMALLOC_PRODUCTION\fR
+\fBMK_MALLOC_PRODUCTION\fR
 make variable)\&.
 .SH "SYNOPSIS"
 .sp

lib/libc/stdlib/jemalloc/Makefile.inc

@@ -45,6 +45,6 @@ MLINKS+= \
 	jemalloc.3 nallocx.3 \
 	jemalloc.3 malloc.conf.5
 
-.if defined(MALLOC_PRODUCTION)
+.if ${MK_MALLOC_PRODUCTION} != "no"
 CFLAGS+=	-DMALLOC_PRODUCTION
 .endif

share/man/man5/make.conf.5

@@ -401,12 +401,6 @@ console driver to
 and allow access over FireWire(IEEE1394) using
 .Xr dconschat 8 .
 Currently, only i386 and amd64 are supported.
-.It Va MALLOC_PRODUCTION
-.Pq Vt bool
-Set this to disable assertions and statistics gathering in
-.Xr malloc 3 .
-It also defaults the A and J runtime options to off.
-Disabled by default on -CURRENT.
 .It Va MAN_ARCH
 .Pq Vt str
 Space-delimited list of one or more MACHINE and/or MACHINE_ARCH values

share/man/man5/src.conf.5

@@ -1,6 +1,6 @@
 .\" DO NOT EDIT-- this file is @generated by tools/build/options/makeman.
 .\" $FreeBSD$
-.Dd July 6, 2020
+.Dd September 5, 2020
 .Dt SRC.CONF 5
 .Os
 .Sh NAME
@@ -1104,6 +1104,11 @@ if executed as an unprivileged user.
 See
 .Xr tests 7
 for more details.
+.It Va WITH_MALLOC_PRODUCTION
+Set to disable assertions and statistics gathering in
+.Xr malloc 3 .
+It also defaults the A and J runtime options to off.
+Disabled by default on -CURRENT.
 .It Va WITHOUT_MAN
 Set to not build manual pages.
 When set, these options are also in effect:
@@ -1278,12 +1283,12 @@ Enable building openldap support for kerberos.
 Set to not build LLVM's OpenMP runtime.
 .Pp
 This is a default setting on
-arm/armv6, arm/armv7, arm64/aarch64, mips/mips, mips/mips64, powerpc/powerpc, riscv/riscv64 and riscv/riscv64sf.
+arm/armv6, arm/armv7, mips/mips, mips/mips64, powerpc/powerpc, riscv/riscv64 and riscv/riscv64sf.
 .It Va WITH_OPENMP
 Set to build LLVM's OpenMP runtime.
 .Pp
 This is a default setting on
-amd64/amd64, i386/i386 and powerpc/powerpc64.
+amd64/amd64, arm64/aarch64, i386/i386 and powerpc/powerpc64.
 .It Va WITHOUT_OPENSSH
 Set to not build OpenSSH.
 .It Va WITHOUT_OPENSSL

share/mk/src.opts.mk

@@ -213,6 +213,7 @@ __DEFAULT_NO_OPTIONS = \
     LOADER_FORCE_LE \
     LOADER_VERBOSE \
     LOADER_VERIEXEC_PASS_MANIFEST \
+    MALLOC_PRODUCTION \
     OFED_EXTRA \
     OPENLDAP \
     REPRODUCIBLE_BUILD \

tools/build/options/WITHOUT_MALLOC_PRODUCTION

@@ -0,0 +1,5 @@
+.\" $FreeBSD$
+Set to enable assertions and statistics gathering in
+.Xr malloc 3 .
+It also defaults the A and J runtime options to on.
+Enabled by default on -CURRENT.

tools/build/options/WITH_MALLOC_PRODUCTION

@@ -0,0 +1,5 @@
+.\" $FreeBSD$
+Set to disable assertions and statistics gathering in
+.Xr malloc 3 .
+It also defaults the A and J runtime options to off.
+Disabled by default on -CURRENT.