Update cosmocc to use superconfigure z0.0.23

Makefile

@@ -93,7 +93,7 @@ endif
 ifeq ($(TOOLCHAIN),)                                                # if TOOLCHAIN isn't defined
 ifeq ("$(wildcard o/third_party/gcc/bin/x86_64-linux-cosmo-*)","")  # if our gcc isn't unbundled
 ifneq ($(UNAME_M)-$(UNAME_S), x86_64-Linux)                         # if this is not amd64 linux
-$(error you need to download https://cosmo.zip/pub/cosmocc/cosmocc-0.0.18.zip and unzip it inside the cosmo directory)
+$(error please run tool/cosmocc/fetch.sh)
 endif
 endif
 endif
@@ -123,7 +123,9 @@ o/$(MODE):			\
 	o/$(MODE)/examples	\
 	o/$(MODE)/third_party
 
-.PHONY: o/$(MODE)/.
+# TODO(jart): Make Emacs `C-c C-c` shortcut not need this.
+.PHONY: o/$(MODE)/ o/$(MODE)/.
+o/$(MODE)/: o/$(MODE)
 o/$(MODE)/.: o/$(MODE)
 
 # check if we're using o//third_party/make/make.com

tool/cosmocc/README.md

@@ -273,7 +273,7 @@ statements instead, so that Cosmopolitan Libc's system constants will
 work as expected. Our modifications to GNU GCC are published under the
 ISC license at <https://github.com/ahgamut/gcc/tree/portcosmo-11.2>. The
 binaries you see here were first published at
-<https://github.com/ahgamut/superconfigure/releases/tag/z0.0.18> which
+<https://github.com/ahgamut/superconfigure/releases/tag/z0.0.23> which
 is regularly updated.
 
 ## Legal

tool/cosmocc/fetch.sh

@@ -0,0 +1,64 @@
+#!/bin/sh
+# tool/cosmocc/fetch.sh
+# sets up mono repo to use latest cosmocc toolchain
+
+URL=https://cosmo.zip/pub/cosmocc/cosmocc.zip
+
+echo creating o/third_party/gcc... >&2
+rm -rf o/third_party/gcc || exit
+mkdir -p o/third_party/gcc || exit
+cd o/third_party/gcc
+
+echo downloading $URL... >&2
+if command -v wget >/dev/null; then
+  wget $URL || exit
+else
+  curl -Lo cosmocc.zip $URL || exit
+fi
+
+echo extracting cosmocc.zip... >&2
+unzip cosmocc.zip || exit
+rm -f cosmocc.zip
+
+# report success and give tips
+cat <<'EOF' >&2
+
+SUCCESS
+
+  the cosmo mono repo will now build using cosmocc
+
+WARNING
+
+  if you run `make clean` then you'll have to download it again
+
+CONSIDER
+
+  you can install the cosmocc toolchain you just downloaded as follows
+
+    sudo chmod 01777 /opt
+    rm -rf /opt/cosmocc
+    mv o/third_party/gcc /opt/cosmocc
+    ln -sf /opt/cosmocc o/third_party/gcc
+    echo 'export PATH="/opt/cosmocc/bin:$PATH"' >>~/.profile
+
+  then just recreate the symlink after cleaning. please note that you
+  should NEVER need to use make clean with the cosmo mono repo, since
+  our Makefile is flawless. if make clean actually helps, file a bug.
+
+EOF
+
+# give tip to linux users
+if [ x"$(uname -s)" = x"Linux" ]; then
+  cat <<'EOF' >&2
+PROTIP
+
+  running these commands
+
+    rm -rf o
+    sudo mount -t tmpfs -o size=10G,noatime,nodiratime /dev/shm o
+    ln -sf /opt/cosmocc o/third_party/gcc
+
+  makes the mono repo build faster
+
+EOF
+fi

tool/cosmocc/package.sh

@@ -71,10 +71,10 @@ done
 OLD=$PWD
 cd "$OUTDIR/"
 if [ ! -x bin/x86_64-linux-cosmo-gcc ]; then
-  wget https://github.com/ahgamut/superconfigure/releases/download/z0.0.19/aarch64-gcc.zip
+  wget https://github.com/ahgamut/superconfigure/releases/download/z0.0.23/aarch64-gcc.zip
   unzip aarch64-gcc.zip
   rm -f aarch64-gcc.zip
-  wget https://github.com/ahgamut/superconfigure/releases/download/z0.0.19/x86_64-gcc.zip
+  wget https://github.com/ahgamut/superconfigure/releases/download/z0.0.23/x86_64-gcc.zip
   unzip x86_64-gcc.zip
   rm -f x86_64-gcc.zip
 fi