build: Move generated config.h into include/common/

config.h is a generated file with "build-features" defines.
We use it for several purposes:
o to check that compiler can do it's job
o to complement user-visible API between distributions
o to add compile-time options from .config global file

It's used in criu and soccr, but compel also needs such thing.

Previously, soccr has a link to config.h in criu includes,
but it would be much cleaner to move it to other headers,
that are shared between sub-projects into include/common.
Reported-by: Adrian Reber <areber@redhat.com>
Signed-off-by: Dmitry Safonov <dsafonov@virtuozzo.com>
Tested-by: Adrian Reber <areber@redhat.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>

.gitignore

@@ -28,10 +28,8 @@ criu/arch/*/sys-exec-tbl*.c
 # x86 syscalls-table is not generated
 !criu/arch/x86/sys-exec-tbl.c
 criu/arch/*/syscalls*.S
-criu/include/config.h
 criu/include/syscall-codes*.h
 criu/include/syscall*.h
-soccr/config.h
 criu/include/version.h
 criu/pie/restorer-blob.h
 criu/pie/parasite-blob.h
@@ -42,3 +40,4 @@ scripts/build/qemu-user-static/*
 lib/.crit-setup.files
 compel/include/asm
 include/common/asm
+include/common/config.h

Makefile

@@ -181,7 +181,7 @@ criu-deps	+= include/common/asm
 
 #
 # Configure variables.
-export CONFIG_HEADER := criu/include/config.h
+export CONFIG_HEADER := include/common/config.h
 ifeq ($(filter tags etags cscope clean mrproper,$(MAKECMDGOALS)),)
 include Makefile.config
 else
@@ -203,13 +203,10 @@ include Makefile.compel
 # Next the socket CR library
 #
 SOCCR_A := soccr/libsoccr.a
-SOCCR_CONFIG := soccr/config.h
-$(SOCCR_CONFIG): $(CONFIG_HEADER)
-	$(Q) test -f $@ || ln -s ../$(CONFIG_HEADER) $@
 soccr/Makefile: ;
-soccr/%: $(SOCCR_CONFIG) .FORCE
+soccr/%: $(CONFIG_HEADER) .FORCE
 	$(Q) $(MAKE) $(build)=soccr $@
-soccr/built-in.o: $(SOCCR_CONFIG) .FORCE
+soccr/built-in.o: $(CONFIG_HEADER) .FORCE
 	$(Q) $(MAKE) $(build)=soccr all
 $(SOCCR_A): |soccr/built-in.o
 criu-deps	+= $(SOCCR_A)
@@ -262,7 +259,6 @@ clean: clean-top
 
 mrproper-top: clean-top
 	$(Q) $(RM) $(CONFIG_HEADER)
-	$(Q) $(RM) $(SOCCR_CONFIG)
 	$(Q) $(RM) $(VERSION_HEADER)
 	$(Q) $(RM) $(COMPEL_VERSION_HEADER)
 	$(Q) $(RM) include/common/asm

criu/cgroup-props.c

@@ -9,10 +9,10 @@
 #include <sys/stat.h>
 
 #include "int.h"
+#include "common/config.h"
 #include "common/compiler.h"
 #include "cgroup-props.h"
 #include "cr_options.h"
-#include "config.h"
 #include "xmalloc.h"
 #include "string.h"
 #include "util.h"

criu/filesystems.c

@@ -4,7 +4,7 @@
 #include <fcntl.h>
 #include <sys/mount.h>
 
-#include "config.h"
+#include "common/config.h"
 #include "int.h"
 #include "common/compiler.h"
 #include "xmalloc.h"

criu/include/cr_options.h

@@ -2,7 +2,7 @@
 #define __CR_OPTIONS_H__
 
 #include <stdbool.h>
-#include "config.h"
+#include "common/config.h"
 #include "common/list.h"
 
 /*

criu/include/kerndat.h

@@ -4,7 +4,7 @@
 #include <stdbool.h>
 
 #include "int.h"
-#include "config.h"
+#include "common/config.h"
 #ifdef CONFIG_VDSO
 #include "util-vdso.h"
 #endif

criu/include/parasite-syscall.h

@@ -3,7 +3,7 @@
 
 #include "pid.h"
 #include "common/list.h"
-#include "config.h"
+#include "common/config.h"
 #include "asm/parasite-syscall.h"
 
 struct parasite_dump_thread;

criu/include/parasite-vdso.h

 #ifndef __CR_PARASITE_VDSO_H__
 #define __CR_PARASITE_VDSO_H__
 
-#include "config.h"
+#include "common/config.h"
 
 #ifdef CONFIG_VDSO
 

criu/include/ptrace-compat.h

@@ -3,7 +3,7 @@
 
 #include <compel/ptrace.h>
 #include <linux/types.h>
-#include "config.h"
+#include "common/config.h"
 
 #ifndef CONFIG_HAS_PTRACE_PEEKSIGINFO
 struct ptrace_peeksiginfo_args {

criu/include/restorer.h

@@ -5,6 +5,7 @@
 #include <limits.h>
 #include <sys/resource.h>
 
+#include "common/config.h"
 #include "types.h"
 #include "int.h"
 #include "types.h"
@@ -13,7 +14,6 @@
 #include "common/lock.h"
 #include "util.h"
 #include "asm/restorer.h"
-#include "config.h"
 #include "posix-timer.h"
 #include "timerfd.h"
 #include "shmem.h"

criu/include/string.h

@@ -7,7 +7,7 @@
 # include <bsd/string.h>
 #endif
 
-#include "config.h"
+#include "common/config.h"
 
 #ifndef CONFIG_HAS_STRLCPY
 extern size_t strlcpy(char *dest, const char *src, size_t size);

criu/include/vdso.h

@@ -4,7 +4,7 @@
 #include <sys/mman.h>
 #include <stdbool.h>
 
-#include "config.h"
+#include "common/config.h"
 
 #ifdef CONFIG_VDSO
 

criu/kerndat.c

@@ -13,6 +13,7 @@
 #include <arpa/inet.h>  /* for sockaddr_in and inet_ntoa() */
 #include <sys/prctl.h>
 
+#include "common/config.h"
 #include "int.h"
 #include "log.h"
 #include "restorer.h"
@@ -25,7 +26,6 @@
 #include "util.h"
 #include "lsm.h"
 #include "proc_parse.h"
-#include "config.h"
 #include "sk-inet.h"
 #include <compel/plugins/std/syscall-codes.h>
 #include <compel/compel.h>

criu/lsm.c

@@ -5,8 +5,8 @@
 #include <sys/types.h>
 #include <unistd.h>
 
+#include "common/config.h"
 #include "kerndat.h"
-#include "config.h"
 #include "pstree.h"
 #include "util.h"
 #include "cr_options.h"

criu/page-pipe.c

@@ -3,8 +3,8 @@
 #undef LOG_PREFIX
 #define LOG_PREFIX "page-pipe: "
 
+#include "common/config.h"
 #include "page.h"
-#include "config.h"
 #include "util.h"
 #include "criu-log.h"
 #include "page-pipe.h"

criu/parasite-syscall.c

@@ -5,6 +5,7 @@
 #include <sys/wait.h>
 #include <sys/mman.h>
 
+#include "common/config.h"
 #include "common/compiler.h"
 #include "types.h"
 #include "protobuf.h"
@@ -20,7 +21,6 @@
 #include "crtools.h"
 #include "namespaces.h"
 #include "kerndat.h"
-#include "config.h"
 #include "pstree.h"
 #include "posix-timer.h"
 #include "mem.h"

criu/pie/parasite.c

@@ -7,11 +7,11 @@
 #include <stdarg.h>
 #include <sys/ioctl.h>
 
+#include "common/config.h"
 #include "int.h"
 #include "types.h"
 #include <compel/plugins/std/syscall.h>
 #include "parasite.h"
-#include "config.h"
 #include "fcntl.h"
 #include "prctl.h"
 #include "common/lock.h"

criu/pie/pie-relocs.h

@@ -3,8 +3,8 @@
 
 #include <compel/compel.h>
 
+#include "common/config.h"
 #include "common/compiler.h"
-#include "config.h"
 
 #define pie_size(__pie_name)	(round_up(sizeof(__pie_name##_blob) + \
 			__pie_name ## _nr_gotpcrel * sizeof(long), page_size()))

criu/pie/restorer.c

@@ -19,6 +19,7 @@
 
 #include "linux/userfaultfd.h"
 
+#include "common/config.h"
 #include "int.h"
 #include "types.h"
 #include "common/compiler.h"
@@ -26,7 +27,6 @@
 #include <compel/plugins/std/log.h>
 #include <compel/ksigset.h>
 #include "signal.h"
-#include "config.h"
 #include "prctl.h"
 #include "criu-log.h"
 #include "util.h"

criu/seccomp.c

@@ -3,7 +3,7 @@
 #include <sys/wait.h>
 #include <unistd.h>
 
-#include "config.h"
+#include "common/config.h"
 #include "imgset.h"
 #include "kcmp.h"
 #include "pstree.h"

criu/shmem.c

@@ -4,6 +4,7 @@
 #include <fcntl.h>
 #include <stdbool.h>
 
+#include "common/config.h"
 #include "common/list.h"
 #include "pid.h"
 #include "shmem.h"
@@ -15,7 +16,6 @@
 #include "rst-malloc.h"
 #include "vma.h"
 #include "mem.h"
-#include "config.h"
 #include <compel/plugins/std/syscall-codes.h>
 #include "bitops.h"
 #include "log.h"

criu/sk-tcp.c

@@ -8,6 +8,7 @@
 
 #include "../soccr/soccr.h"
 
+#include "common/config.h"
 #include "cr_options.h"
 #include "util.h"
 #include "common/list.h"
@@ -19,7 +20,6 @@
 #include "image.h"
 #include "namespaces.h"
 #include "xmalloc.h"
-#include "config.h"
 #include "kerndat.h"
 #include "restorer.h"
 #include "rst-malloc.h"

soccr/soccr.h

@@ -5,7 +5,7 @@
 #include <stdint.h>		/* uint32_t */
 #include <sys/socket.h>		/* sockaddr */
 
-#include "config.h"
+#include "common/config.h"
 
 /* All packets with this mark have not to be blocked. */
 #define SOCCR_MARK 0xC114