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authorMasahiro Yamada <yamada.masahiro@socionext.com>2018-11-30 04:05:26 +0300
committerMasahiro Yamada <yamada.masahiro@socionext.com>2018-12-01 17:13:14 +0300
commitbbda5ec671d3fe62faefa1cab7270aa586042a4b (patch)
treea1d375f74ad25efd2797bffaadfb0dc5fc1f65fe /scripts/basic
parentee3e46b7efd2954479f87030d31fda3c22bbc763 (diff)
downloadlinux-bbda5ec671d3fe62faefa1cab7270aa586042a4b.tar.xz
kbuild: simplify dependency generation for CONFIG_TRIM_UNUSED_KSYMS
My main motivation of this commit is to clean up scripts/Kbuild.include and scripts/Makefile.build. Currently, CONFIG_TRIM_UNUSED_KSYMS works with a tricky gimmick; possibly exported symbols are detected by letting $(CPP) replace EXPORT_SYMBOL* with a special string '=== __KSYM_*===', which is post-processed by sed, and passed to fixdep. The extra preprocessing is costly, and hacking cmd_and_fixdep is ugly. I came up with a new way to find exported symbols; insert a dummy symbol __ksym_marker_* to each potentially exported symbol. Those dummy symbols are picked up by $(NM), post-processed by sed, then appended to .*.cmd files. I collected the post-process part to a new shell script scripts/gen_ksymdeps.sh for readability. The dummy symbols are put into the .discard.* section so that the linker script rips them off the final vmlinux or modules. A nice side-effect is building with CONFIG_TRIM_UNUSED_KSYMS will be much faster. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Reviewed-by: Nicolas Pitre <nico@linaro.org>
Diffstat (limited to 'scripts/basic')
-rw-r--r--scripts/basic/fixdep.c31
1 files changed, 4 insertions, 27 deletions
diff --git a/scripts/basic/fixdep.c b/scripts/basic/fixdep.c
index 850966f3d602..facbd603adf6 100644
--- a/scripts/basic/fixdep.c
+++ b/scripts/basic/fixdep.c
@@ -105,8 +105,7 @@
static void usage(void)
{
- fprintf(stderr, "Usage: fixdep [-e] <depfile> <target> <cmdline>\n");
- fprintf(stderr, " -e insert extra dependencies given on stdin\n");
+ fprintf(stderr, "Usage: fixdep <depfile> <target> <cmdline>\n");
exit(1);
}
@@ -131,21 +130,6 @@ static void print_dep(const char *m, int slen, const char *dir)
printf(".h) \\\n");
}
-static void do_extra_deps(void)
-{
- char buf[80];
-
- while (fgets(buf, sizeof(buf), stdin)) {
- int len = strlen(buf);
-
- if (len < 2 || buf[len - 1] != '\n') {
- fprintf(stderr, "fixdep: bad data on stdin\n");
- exit(1);
- }
- print_dep(buf, len - 1, "include/ksym");
- }
-}
-
struct item {
struct item *next;
unsigned int len;
@@ -293,7 +277,7 @@ static int is_ignored_file(const char *s, int len)
* assignments are parsed not only by make, but also by the rather simple
* parser in scripts/mod/sumversion.c.
*/
-static void parse_dep_file(char *m, const char *target, int insert_extra_deps)
+static void parse_dep_file(char *m, const char *target)
{
char *p;
int is_last, is_target;
@@ -369,9 +353,6 @@ static void parse_dep_file(char *m, const char *target, int insert_extra_deps)
exit(1);
}
- if (insert_extra_deps)
- do_extra_deps();
-
printf("\n%s: $(deps_%s)\n\n", target, target);
printf("$(deps_%s):\n", target);
}
@@ -379,13 +360,9 @@ static void parse_dep_file(char *m, const char *target, int insert_extra_deps)
int main(int argc, char *argv[])
{
const char *depfile, *target, *cmdline;
- int insert_extra_deps = 0;
void *buf;
- if (argc == 5 && !strcmp(argv[1], "-e")) {
- insert_extra_deps = 1;
- argv++;
- } else if (argc != 4)
+ if (argc != 4)
usage();
depfile = argv[1];
@@ -395,7 +372,7 @@ int main(int argc, char *argv[])
printf("cmd_%s := %s\n\n", target, cmdline);
buf = read_file(depfile);
- parse_dep_file(buf, target, insert_extra_deps);
+ parse_dep_file(buf, target);
free(buf);
return 0;