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busybox: get rid of nested functions in find 

This allows us to compile busybox using clang. Nested functions is
a gcc extension not supported by clang.

(From OE-Core rev: d2bf599f36ed1a04c661fc0a71e664e219532cbc)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Muhammad Tauqir Ahmad 2013-12-13 14:25:57 -05:00 committed by Richard Purdie
parent e230b44987
commit 8babb8ff17
2 changed files with 118 additions and 0 deletions
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117
meta/recipes-core/busybox/busybox/find-get-rid-of-nested-functions.patch Normal file
View File

@ -0,0 +1,117 @@
Upstream-Status: Accepted
commit 6db5f679a21342249e6a6eb06ec70a337bf0d0b0
Author: Denys Vlasenko <vda.linux@googlemail.com>
Date: Thu May 16 18:36:42 2013 +0200
find:: get rid of nested function (it's a gcc-ism)
function old new delta
alloc_action - 80 +80
parse_params 1459 1445 -14
static.alloc_action 98 - -98
(add/remove: 1/1 grow/shrink: 0/1 up/down: 80/-112) Total: -32 bytes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/findutils/find.c b/findutils/find.c
index d4b7c8e..af913cc 100644
--- a/findutils/find.c
+++ b/findutils/find.c
@@ -815,6 +815,31 @@ static const char* plus_minus_num(const char* str)
}
#endif
+/* Say no to GCCism */
+#define USE_NESTED_FUNCTION 0
+
+#if !USE_NESTED_FUNCTION
+struct pp_locals {
+ action*** appp;
+ unsigned cur_group;
+ unsigned cur_action;
+ IF_FEATURE_FIND_NOT( bool invert_flag; )
+};
+static action* alloc_action(struct pp_locals *ppl, int sizeof_struct, action_fp f)
+{
+ action *ap = xzalloc(sizeof_struct);
+ action **app;
+ action ***group = &ppl->appp[ppl->cur_group];
+ *group = app = xrealloc(*group, (ppl->cur_action+2) * sizeof(ppl->appp[0][0]));
+ app[ppl->cur_action++] = ap;
+ app[ppl->cur_action] = NULL;
+ ap->f = f;
+ IF_FEATURE_FIND_NOT( ap->invert = ppl->invert_flag; )
+ IF_FEATURE_FIND_NOT( ppl->invert_flag = 0; )
+ return ap;
+}
+#endif
+
static action*** parse_params(char **argv)
{
enum {
@@ -901,10 +926,18 @@ static action*** parse_params(char **argv)
IF_FEATURE_FIND_MAXDEPTH("-mindepth\0""-maxdepth\0")
;
+#if !USE_NESTED_FUNCTION
+ struct pp_locals ppl;
+#define appp (ppl.appp )
+#define cur_group (ppl.cur_group )
+#define cur_action (ppl.cur_action )
+#define invert_flag (ppl.invert_flag)
+#define ALLOC_ACTION(name) (action_##name*)alloc_action(&ppl, sizeof(action_##name), (action_fp) func_##name)
+#else
action*** appp;
- unsigned cur_group = 0;
- unsigned cur_action = 0;
- IF_FEATURE_FIND_NOT( bool invert_flag = 0; )
+ unsigned cur_group;
+ unsigned cur_action;
+ IF_FEATURE_FIND_NOT( bool invert_flag; )
/* This is the only place in busybox where we use nested function.
* So far more standard alternatives were bigger. */
@@ -913,7 +946,7 @@ static action*** parse_params(char **argv)
action* alloc_action(int sizeof_struct, action_fp f)
{
action *ap;
- appp[cur_group] = xrealloc(appp[cur_group], (cur_action+2) * sizeof(*appp));
+ appp[cur_group] = xrealloc(appp[cur_group], (cur_action+2) * sizeof(appp[0][0]));
appp[cur_group][cur_action++] = ap = xzalloc(sizeof_struct);
appp[cur_group][cur_action] = NULL;
ap->f = f;
@@ -921,9 +954,12 @@ static action*** parse_params(char **argv)
IF_FEATURE_FIND_NOT( invert_flag = 0; )
return ap;
}
-
#define ALLOC_ACTION(name) (action_##name*)alloc_action(sizeof(action_##name), (action_fp) func_##name)
+#endif
+ cur_group = 0;
+ cur_action = 0;
+ IF_FEATURE_FIND_NOT( invert_flag = 0; )
appp = xzalloc(2 * sizeof(appp[0])); /* appp[0],[1] == NULL */
while (*argv) {
@@ -988,7 +1024,7 @@ static action*** parse_params(char **argv)
dbg("%d", __LINE__);
/* start new OR group */
cur_group++;
- appp = xrealloc(appp, (cur_group+2) * sizeof(*appp));
+ appp = xrealloc(appp, (cur_group+2) * sizeof(appp[0]));
/*appp[cur_group] = NULL; - already NULL */
appp[cur_group+1] = NULL;
cur_action = 0;
@@ -1246,6 +1282,9 @@ static action*** parse_params(char **argv)
dbg("exiting %s", __func__);
return appp;
#undef ALLOC_ACTION
+#undef appp
+#undef cur_action
+#undef invert_flag
}
int find_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;

1
meta/recipes-core/busybox/busybox_1.21.1.bb
View File

@ -34,6 +34,7 @@ SRC_URI = "http://www.busybox.net/downloads/busybox-${PV}.tar.bz2;name=tarball \
file://login-utilities.cfg \
file://busybox-list-suid-and-non-suid-app-configs.patch \
file://busybox-sed-fix-sed-clusternewline-testcase.patch \
file://find-get-rid-of-nested-functions.patch \
"
SRC_URI[tarball.md5sum] = "795394f83903b5eec6567d51eebb417e"