libap: promote xmalloc/exitfail to libap; drop from per-package gnulib

xmalloc+xalloc_die were already in libap's malloc/xmalloc.c. Add
exitfail.c (int volatile exit_failure = EXIT_FAILURE) and exitfail.h
to libap's malloc/ so packages don't need their own copies.

Remove xmalloc.$O, xalloc-die.$O, exitfail.$O from bison, diff, grep,
m4, and patch gnulib object lists — they are now satisfied by libap.a.
Note: xmalloca.$O in m4 stays (xmalloca() is not in libap).

https://claude.ai/code/session_01WGAwvvTwDg2yknFkmZ3qzs

Author: claude

sys/include/ape/exitfail.h

@@ -0,0 +1,16 @@
+#ifndef _EXITFAIL_H
+#define _EXITFAIL_H
+
+#pragma lib "/$M/lib/ape/libap.a"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern int volatile exit_failure;
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _EXITFAIL_H */

sys/src/ape/cmd/bison/mkfile

@@ -88,7 +88,7 @@ LIB_OBJS=\
 #	libbison_a-dirname-lgpl.$O \
 #	libbison_a-stripslash.$O \
 	libbison_a-execute.$O \
-	libbison_a-exitfail.$O \
+#	libbison_a-exitfail.$O \
 	libbison_a-fatal-signal.$O \
 #	libbison_a-fd-safer-flag.$O \
 #	libbison_a-dup-safer-flag.$O \
@@ -142,8 +142,8 @@ LIB_OBJS=\
 #	libbison_a-pipe-safer.$O \
 	libbison_a-wait-process.$O \
 #	libbison_a-wctype-h.$O \
-	libbison_a-xmalloc.$O \
-	libbison_a-xalloc-die.$O \
+#	libbison_a-xmalloc.$O \
+#	libbison_a-xalloc-die.$O \
 	libbison_a-xconcat-filename.$O \
 	libbison_a-xhash.$O \
 #	libbison_a-gl_xlist.$O \

sys/src/ape/cmd/diff/mkfile

@@ -12,7 +12,6 @@ LIB= libdiff.a$O
 
 LIBO=\
 	sigsegv.$O stdbit.$O\
-	xmalloc.$O xalloc-die.$O\
 	xstrtoimax.$O\
 	quotearg.$O\
 	diagnose.$O\
@@ -21,8 +20,7 @@ LIBO=\
 	c-stack.$O\
 	xstdopen.$O\
 	propername-lite.$O\
-	cmpbuf.$O\
-	exitfail.$O
+	cmpbuf.$O
 
 CMPO=\
 	cmp.$O system.$O

sys/src/ape/cmd/grep/mkfile

@@ -37,7 +37,7 @@ LIB_OBJS=\
 #	libgreputils_a-dup2.$O \
 #	libgreputils_a-error.$O \
 	libgreputils_a-exclude.$O \
-	libgreputils_a-exitfail.$O \
+#	libgreputils_a-exitfail.$O \
 #	libgreputils_a-fcntl.$O \
 #	libgreputils_a-creat-safer.$O \
 #	libgreputils_a-open-safer.$O \
@@ -114,8 +114,8 @@ LIB_OBJS=\
 #	libgreputils_a-wctype.$O \
 #	libgreputils_a-wctype-h.$O \
 	libgreputils_a-wmempcpy.$O \
-	libgreputils_a-xmalloc.$O \
-	libgreputils_a-xalloc-die.$O \
+#	libgreputils_a-xmalloc.$O \
+#	libgreputils_a-xalloc-die.$O \
 #	libgreputils_a-xbinary-io.$O \
 	libgreputils_a-xstrtoimax.$O \
 	libgreputils_a-xstrtol.$O \

sys/src/ape/cmd/m4/mkfile

@@ -37,7 +37,6 @@ LIB_OBJS= \
 #	dup-safer-flag.$O\
 	error.$O\
 	execute.$O\
-	exitfail.$O\
 	fatal-signal.$O\
 #	fd-safer.$O\
 #	fd-safer-flag.$O\
@@ -91,9 +90,7 @@ LIB_OBJS= \
 #	vfzprintf.$O\
 #	vzprintf.$O\
 	wait-process.$O\
-	xalloc-die.$O\
 	xasprintf.$O\
-	xmalloc.$O\
 	xmalloca.$O\
 	xmemdup0.$O\
 	xprintf.$O\

sys/src/ape/cmd/patch/mkfile

@@ -11,12 +11,9 @@ OFILES=\
 	safe.$O util.$O version.$O merge.$O
 
 LIBO=\
-	xmalloc.$O\
-	xalloc-die.$O\
 	argmatch.$O\
 	backup-find.$O\
 	basename-lgpl.$O\
-	exitfail.$O\
 	gettime.$O\
 	hash.$O\
 	parse-datetime.$O\

sys/src/ape/lib/ap/malloc/exitfail.c

@@ -0,0 +1,3 @@
+#include <stdlib.h>
+
+int volatile exit_failure = EXIT_FAILURE;

sys/src/ape/lib/ap/malloc/mkfile

@@ -19,6 +19,7 @@ OFILES=\
 	aligned_alloc.$O\
 # GNU xalloc family\
 	xmalloc.$O\
+	exitfail.$O\
 
 <$APEXPROOT/sys/src/cmd/mksyslib