@@ -686,29 +686,32 @@ int main(int ac, char **av)
break;
}
- if (sync_kconfig) {
- /* syncconfig is used during the build so we shall update autoconf.
- * All other commands are only used to generate a config.
- */
- if (!no_conf_write && conf_write(NULL)) {
- fprintf(stderr, "\n*** Error during writing of the configuration.\n\n");
- exit(1);
- }
- if (conf_write_autoconf()) {
- fprintf(stderr, "\n*** Error during update of the configuration.\n\n");
- return 1;
- }
- } else if (input_mode == savedefconfig) {
+ if (input_mode == savedefconfig) {
if (conf_write_defconfig(defconfig_file)) {
fprintf(stderr, "n*** Error while saving defconfig to: %s\n\n",
defconfig_file);
return 1;
}
} else if (input_mode != listnewconfig) {
- if (conf_write(NULL)) {
+ if (!no_conf_write && conf_write(NULL)) {
fprintf(stderr, "\n*** Error during writing of the configuration.\n\n");
exit(1);
}
+
+ /*
+ * Create auto.conf if it does not exist.
+ * This prevents GNU Make 4.1 or older from emitting
+ * "include/config/auto.conf: No such file or directory"
+ * in the top-level Makefile
+ *
+ * syncconfig always creates or updates auto.conf because it is
+ * used during the build.
+ */
+ if (conf_write_autoconf(sync_kconfig) && sync_kconfig) {
+ fprintf(stderr,
+ "\n*** Error during sync of the configuration.\n\n");
+ return 1;
+ }
}
return 0;
}
@@ -1012,13 +1012,17 @@ static int conf_split_config(void)
return res;
}
-int conf_write_autoconf(void)
+int conf_write_autoconf(int overwrite)
{
struct symbol *sym;
const char *name;
+ const char *autoconf_name = conf_get_autoconfig_name();
FILE *out, *tristate, *out_h;
int i;
+ if (!overwrite && is_file(autoconf_name))
+ return 0;
+
sym_clear_all_valid();
conf_write_dep("include/config/auto.conf.cmd");
@@ -1081,14 +1085,13 @@ int conf_write_autoconf(void)
if (rename(".tmpconfig_tristate", name))
return 1;
- name = conf_get_autoconfig_name();
- if (mkdir_p(name))
+ if (mkdir_p(autoconf_name))
return 1;
/*
* This must be the last step, kbuild has a dependency on auto.conf
* and this marks the successful completion of the previous steps.
*/
- if (rename(".tmpconfig", name))
+ if (rename(".tmpconfig", autoconf_name))
return 1;
return 0;
@@ -525,6 +525,7 @@ void on_save_activate(GtkMenuItem * menuitem, gpointer user_data)
{
if (conf_write(NULL))
text_insert_msg("Error", "Unable to save configuration !");
+ conf_write_autoconf(0);
}
@@ -7,7 +7,7 @@ int conf_read(const char *name);
int conf_read_simple(const char *name, int);
int conf_write_defconfig(const char *name);
int conf_write(const char *name);
-int conf_write_autoconf(void);
+int conf_write_autoconf(int overwrite);
bool conf_get_changed(void);
void conf_set_changed_callback(void (*fn)(void));
void conf_set_message_callback(void (*fn)(const char *fmt, va_list ap));
@@ -977,6 +977,7 @@ static int handle_exit(void)
"\n\n");
return 1;
}
+ conf_write_autoconf(0);
/* fall through */
case -1:
if (!silent)
@@ -674,6 +674,7 @@ static int do_exit(void)
"Your configuration changes were NOT saved.",
1,
"<OK>");
+ conf_write_autoconf(0);
break;
default:
btn_dialog(
@@ -1535,6 +1535,8 @@ bool ConfigMainWindow::saveConfig(void)
QMessageBox::information(this, "qconf", "Unable to save configuration!");
return false;
}
+ conf_write_autoconf(0);
+
return true;
}
Currently, only syncconfig creates or updates include/config/auto.conf and some other files. Other config targets create or update only the .config file. When you configure and build the kernel from a pristine source tree, any config target is followed by syncconfig in the build stage since include/config/auto.conf is missing. We are moving compiler tests from Makefile to Kconfig. It means that parsing Kconfig files will be more costly since Kconfig invokes the compiler commands internally. Thus, we want to avoid invoking Kconfig twice (one for *config to create the .config, and one for syncconfig to synchronize the auto.conf). If auto.conf does not exist, we can generate all configuration files in the first configuration stage, which will save the syncconfig in the build stage. Please note this should be done only when auto.conf is missing. If *config blindly did this, time stamp files under include/config/ would be unnecessarily touched, triggering unneeded rebuild of objects. I assume a scenario like this: 1. You have a source tree that has already been built with CONFIG_FOO disabled 2. Run "make menuconfig" to enable CONFIG_FOO 3. CONFIG_FOO turns out to be unnecessary. Run "make menuconfig" again to disable CONFIG_FOO 4. Run "make" In this case, include/config/foo.h should not be touched since there is no change in CONFIG_FOO. The sync process should be delayed until the user really attempts to build the kernel. This commit has another motivation; I want to suppress the 'No such file or directory' warning from the 'include' directive. The top-level Makefile includes auto.conf with '-include' directive, like this: ifeq ($(dot-config),1) -include include/config/auto.conf endif This looks strange because auto.conf is mandatory when dot-config is 1. I guess only the reason of using '-include' is to suppress the warning 'include/config/auto.conf: No such file or directory' when building from a clean tree. However, this has a side-effect; Make considers the files included by '-include' are optional. Hence, Make continues to build even if it fails to generate include/config/auto.conf. I will change this in the next commit, but the warning message is annoying. (At least, kbuild test robot reports it as a regression.) With this commit, Kconfig will generate all configuration files together with the .config and I guess it is a solution good enough to suppress the warning. Note: GNU Make 4.2 or later does not display the warning from the 'include' directive if include files are successfully generated. See GNU Make commit 87a5f98d248f ("[SV 102] Don't show unnecessary include file errors.") However, older GNU Make versions are still widely used. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> --- scripts/kconfig/conf.c | 31 +++++++++++++++++-------------- scripts/kconfig/confdata.c | 11 +++++++---- scripts/kconfig/gconf.c | 1 + scripts/kconfig/lkc_proto.h | 2 +- scripts/kconfig/mconf.c | 1 + scripts/kconfig/nconf.c | 1 + scripts/kconfig/qconf.cc | 2 ++ 7 files changed, 30 insertions(+), 19 deletions(-) -- 2.7.4