[PATCH 1/1] BUG/MINOR: lua: remove loop initial declarations

[Bertrand Jacquin]

HAProxy is documented to support gcc >= 3.4 as per INSTALL file, however
hlua.c makes use of c11 only loop initial declarations leading to build
failure when using gcc-4.9.4:

  x86_64-unknown-linux-gnu-gcc -Iinclude  -Wchar-subscripts -Wcomment -Wformat 
-Winit-self -Wmain -Wmissing-braces -Wno-pragmas -Wparentheses -Wreturn-type 
-Wsequence-point -Wstrict-aliasing -Wswitch -Wtrigraphs -Wuninitialized 
-Wunknown-pragmas -Wunused-label -Wunused-variable -Wunused-value 
-Wpointer-sign -Wimplicit -pthread -fdiagnostics-color=auto -D_LARGEFILE_SOURCE 
-D_FILE_OFFSET_BITS=64 -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -O3 -msse 
-mfpmath=sse -march=core2 -g -fPIC -g -Wall -Wextra -Wundef 
-Wdeclaration-after-statement -fwrapv -Wno-unused-label -Wno-sign-compare 
-Wno-unused-parameter -Wno-clobbered -Wno-missing-field-initializers 
-Wtype-limits      -DUSE_EPOLL  -DUSE_NETFILTER   -DUSE_PCRE2 -DUSE_PCRE2_JIT 
-DUSE_POLL -DUSE_THREAD -DUSE_BACKTRACE   -DUSE_TPROXY -DUSE_LINUX_TPROXY 
-DUSE_LINUX_SPLICE -DUSE_LIBCRYPT -DUSE_CRYPT_H -DUSE_GETADDRINFO -DUSE_OPENSSL 
-DUSE_LUA -DUSE_ACCEPT4   -DUSE_SLZ -DUSE_CPU_AFFINITY -DUSE_TFO -DUSE_NS 
-DUSE_DL -DUSE_RT      -DUSE_PRCTL  -DUSE_THREAD_DUMP        -DUSE_PCRE2 
-DPCRE2_CODE_UNIT_WIDTH=8  -I/usr/local/include 
-DCONFIG_HAPROXY_VERSION=\"2.5.0\" -DCONFIG_HAPROXY_DATE=\"2021/11/23\" -c -o 
src/connection.o src/connection.c
  src/hlua.c: In function 'hlua_config_prepend_path':
  src/hlua.c:11292:2: error: 'for' loop initial declarations are only allowed 
in C99 or C11 mode
    for (size_t i = 0; i < 2; i++) {
    ^
  src/hlua.c:11292:2: note: use option -std=c99, -std=gnu99, -std=c11 or 
-std=gnu11 to compile your code

This commit moves loop iterator to an explicit declaration.

No backport needed as this issue was introduced in v2.5-dev10~69 with
commit 9e5e586e35c5 ("BUG/MINOR: lua: Fix lua error handling in
`hlua_config_prepend_path()`")
---
 src/hlua.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/hlua.c b/src/hlua.c
index 08735374af77..8dea91e75832 100644
--- a/src/hlua.c
+++ b/src/hlua.c
@@ -11249,6 +11249,7 @@ static int hlua_config_prepend_path(char **args, int 
section_type, struct proxy
        char *path;
        char *type = "path";
        struct prepend_path *p = NULL;
+       size_t i;
 
        if (too_many_args(2, args, err, NULL)) {
                goto err;
@@ -11289,7 +11290,7 @@ static int hlua_config_prepend_path(char **args, int 
section_type, struct proxy
         * thread. The remaining threads will be initialized based on
         * prepend_path_list.
         */
-       for (size_t i = 0; i < 2; i++) {
+       for (i = 0; i < 2; i++) {
                lua_State *L = hlua_states[i];
                const char *error;