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kbuild: redo fake deps at include/config/*.h

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Make include/config/foo/bar.h fake deps files generation simpler.

* delete .h suffix
	those aren't header files, shorten filenames,

* delete tolower()
	Linux filesystems can deal with both upper and lowercase
	filenames very well,

* put everything in 1 directory
	Presumably 'mkdir -p' split is from dark times when filesystems
	handled huge directories badly, disks were round adding to
	seek times.

	x86_64 allmodconfig lists 12364 files in include/config.

	../obj/include/config/
	├── 104_QUAD_8
	├── 60XX_WDT
	├── 64BIT
		...
	├── ZSWAP_DEFAULT_ON
	├── ZSWAP_ZPOOL_DEFAULT
	└── ZSWAP_ZPOOL_DEFAULT_ZBUD

	0 directories, 12364 files

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
This commit is contained in:
Alexey Dobriyan
2021-04-15 20:36:07 +03:00
committed by Masahiro Yamada
parent e3456056f1
commit 0e0345b77a
6 changed files with 16 additions and 52 deletions
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43
scripts/basic/fixdep.c
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@@ -34,7 +34,7 @@
* the config symbols are rebuilt.
*
* So if the user changes his CONFIG_HIS_DRIVER option, only the objects
* which depend on "include/config/his/driver.h" will be rebuilt,
* which depend on "include/config/HIS_DRIVER" will be rebuilt,
* so most likely only his driver ;-)
*
* The idea above dates, by the way, back to Michael E Chastain, AFAIK.
@@ -74,7 +74,7 @@
*
* and then basically copies the .<target>.d file to stdout, in the
* process filtering out the dependency on autoconf.h and adding
* dependencies on include/config/my/option.h for every
* dependencies on include/config/MY_OPTION for every
* CONFIG_MY_OPTION encountered in any of the prerequisites.
*
* We don't even try to really parse the header files, but
@@ -107,8 +107,8 @@ static void usage(void)
/*
* In the intended usage of this program, the stdout is redirected to .*.cmd
* files. The return value of printf() and putchar() must be checked to catch
* any error, e.g. "No space left on device".
* files. The return value of printf() must be checked to catch any error,
* e.g. "No space left on device".
*/
static void xprintf(const char *format, ...)
{
@@ -124,38 +124,6 @@ static void xprintf(const char *format, ...)
va_end(ap);
}
static void xputchar(int c)
{
int ret;
ret = putchar(c);
if (ret == EOF) {
perror("fixdep");
exit(1);
}
}
/*
* Print out a dependency path from a symbol name
*/
static void print_dep(const char *m, int slen, const char *dir)
{
int c, prev_c = '/', i;
xprintf(" $(wildcard %s/", dir);
for (i = 0; i < slen; i++) {
c = m[i];
if (c == '_')
c = '/';
else
c = tolower(c);
if (c != '/' || prev_c != '/')
xputchar(c);
prev_c = c;
}
xprintf(".h) \\\n");
}
struct item {
struct item *next;
unsigned int len;
@@ -220,7 +188,8 @@ static void use_config(const char *m, int slen)
return;
define_config(m, slen, hash);
print_dep(m, slen, "include/config");
/* Print out a dependency path from a symbol name. */
xprintf(" $(wildcard include/config/%.*s) \\\n", slen, m);
}
/* test if s ends in sub */