[PATCH 2/4] compat/regex: silence `make sparse` warning

["Đoàn Trần Công Danh" <congdanhqx@gmail.com>]

* alloca: somewhere later in the code, we indirectly include alloca.h
which will define alloca again, include it prior to define alloca in
order to not define it against.

* Copy all attributes from the header to source file, and move the
  attributes prior to function name. cgcc is very picky on the position
  of attribute.

Signed-off-by: Đoàn Trần Công Danh <congdanhqx@gmail.com>
---
 compat/regex/regex.c          | 1 +
 compat/regex/regex_internal.c | 2 +-
 compat/regex/regex_internal.h | 5 ++---
 3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/compat/regex/regex.c b/compat/regex/regex.c
index f3e03a9eab..4bef75a716 100644
--- a/compat/regex/regex.c
+++ b/compat/regex/regex.c
@@ -62,6 +62,7 @@
 #include <stdint.h>
 
 #ifdef GAWK
+#include <alloca.h>
 #undef alloca
 #define alloca alloca_is_bad_you_should_never_use_it
 #endif
diff --git a/compat/regex/regex_internal.c b/compat/regex/regex_internal.c
index ec51cf3446..58504f795b 100644
--- a/compat/regex/regex_internal.c
+++ b/compat/regex/regex_internal.c
@@ -921,7 +921,7 @@ re_string_destruct (re_string_t *pstr)
 /* Return the context at IDX in INPUT.  */
 
 static unsigned int
-internal_function
+internal_function __attribute ((pure))
 re_string_context_at (const re_string_t *input, int idx, int eflags)
 {
   int c;
diff --git a/compat/regex/regex_internal.h b/compat/regex/regex_internal.h
index 3ee8aae59d..c61a1e4971 100644
--- a/compat/regex/regex_internal.h
+++ b/compat/regex/regex_internal.h
@@ -430,9 +430,8 @@ static reg_errcode_t build_wcs_upper_buffer (re_string_t *pstr)
 # endif /* RE_ENABLE_I18N */
 static void build_upper_buffer (re_string_t *pstr) internal_function;
 static void re_string_translate_buffer (re_string_t *pstr) internal_function;
-static unsigned int re_string_context_at (const re_string_t *input, int idx,
-					  int eflags)
-     internal_function __attribute ((pure));
+static internal_function __attribute ((pure))
+unsigned int re_string_context_at (const re_string_t *input, int idx, int eflags);
 #endif
 #define re_string_peek_byte(pstr, offset) \
   ((pstr)->mbs[(pstr)->cur_idx + offset])
-- 
2.26.2.384.g435bf60bd5