feat: cosmopolitan libc support

Added support for cosmopolitan libc.
Simply do `make COSMO=yes` and you'll get feuille.com, a working
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+ version bump.

config.mk

@@ -1,5 +1,5 @@
 # feuille version
-VERSION = 1.19.5
+VERSION = 2.0.0
 
 # paths (customize them to fit your system)
 PREFIX = /usr/local
@@ -17,13 +17,28 @@ LIBS = -L/usr/lib -lc
 # compiler
 CC = cc
 
-# debug build
-CFLAGS  = -g -std=c99 -Wall -Wextra -Wpedantic -Wno-sign-compare -DVERSION=\"$(VERSION)\" -DDEBUG $(INCS)
-LDFLAGS = -g $(LIBS)
+# cosmopolitan libc flags
+CCFLAGS  = -std=c99 -nostdinc -fno-pie -fno-omit-frame-pointer \
+           -mno-tls-direct-seg-refs -mno-red-zone              \
+           -DVERSION=\"$(VERSION)\" -DCOSMOPOLITAN             \
+           -I. -include cosmopolitan/cosmopolitan.h
 
-# release build
-CFLAGS$(DEBUG)  = -std=c99 -Wall -Wextra -Wno-sign-compare -DVERSION=\"$(VERSION)\" -O3 $(INCS)
-LDFLAGS$(DEBUG) = -s $(LIBS)
+CLDFLAGS = -std=c99 -static -nostdlib -fno-pie -fno-omit-frame-pointer \
+           -mno-tls-direct-seg-refs -mno-red-zone                      \
+           -fuse-ld=bfd -Wl,-T,cosmopolitan/ape.lds -Wl,--gc-sections  \
+           cosmopolitan/crt.o cosmopolitan/ape-no-modify-self.o cosmopolitan/cosmopolitan.a
+
+# standard libc flags
+CCFLAGS$(COSMO)  = -std=c99 -DVERSION=\"$(VERSION)\" $(INCS)
+CLDFLAGS$(COSMO) = $(LIBS)
+
+# debug flags
+CFLAGS  = -g -Wall -Wextra -Wno-sign-compare -DDEBUG $(CCFLAGS)
+LDFLAGS = -g $(CLDFLAGS)
+
+# release flags
+CFLAGS$(DEBUG)  = -O3 -Wall -Wextra -Wno-sign-compare $(CCFLAGS)
+LDFLAGS$(DEBUG) = -s $(CLDFLAGS)
 
 # static build (uncomment)
 #LD_FLAGS += -static