build: variadic macro tidy-ups

- delete unused `HAVE_VARIADIC_MACROS_C99/GCC` feature checks.
  (both autotools and CMake.)
- delete duplicate `NULL` check in `Curl_trc_cf_infof()`.
- fix compiler warning in `CURL_DISABLE_VERBOSE_STRINGS` builds.
  ```
  ./lib/cf-socket.c:122:41: warning: unused parameter 'data' [-Wunused-parameter]
  static void nosigpipe(struct Curl_easy *data,
                                          ^
  ```
- fix `#ifdef` comments in `lib/curl_trc.{c,h}`.
- fix indentation in some `infof()` calls.

Follow-up to dac293cfb7 #12167

Cherry-picked from #12105
Closes #12210

CMake/CurlTests.c

@@ -400,58 +400,6 @@ int main(void)
 }
 #endif
 
-#ifdef HAVE_VARIADIC_MACROS_C99
-#define c99_vmacro3(first, ...) fun3(first, __VA_ARGS__)
-#define c99_vmacro2(first, ...) fun2(first, __VA_ARGS__)
-
-int fun3(int arg1, int arg2, int arg3);
-int fun2(int arg1, int arg2);
-
-int fun3(int arg1, int arg2, int arg3)
-{
-  return arg1 + arg2 + arg3;
-}
-int fun2(int arg1, int arg2)
-{
-  return arg1 + arg2;
-}
-
-int main(void)
-{
-  int res3 = c99_vmacro3(1, 2, 3);
-  int res2 = c99_vmacro2(1, 2);
-  (void)res3;
-  (void)res2;
-  return 0;
-}
-#endif
-
-#ifdef HAVE_VARIADIC_MACROS_GCC
-#define gcc_vmacro3(first, args...) fun3(first, args)
-#define gcc_vmacro2(first, args...) fun2(first, args)
-
-int fun3(int arg1, int arg2, int arg3);
-int fun2(int arg1, int arg2);
-
-int fun3(int arg1, int arg2, int arg3)
-{
-  return arg1 + arg2 + arg3;
-}
-int fun2(int arg1, int arg2)
-{
-  return arg1 + arg2;
-}
-
-int main(void)
-{
-  int res3 = gcc_vmacro3(1, 2, 3);
-  int res2 = gcc_vmacro2(1, 2);
-  (void)res3;
-  (void)res2;
-  return 0;
-}
-#endif
-
 #ifdef HAVE_ATOMIC
 /* includes start */
 #ifdef HAVE_SYS_TYPES_H

CMake/Platforms/WindowsCache.cmake

@@ -55,11 +55,6 @@ else()
     set(HAVE_LOCALE_H 1)
     set(HAVE_STDDEF_H 1)  # detected by CMake internally in check_type_size()
     set(HAVE_STDATOMIC_H 0)
-    if(NOT MSVC_VERSION LESS 1400)
-      set(HAVE_VARIADIC_MACROS_C99 1)
-    else()
-      set(HAVE_VARIADIC_MACROS_C99 0)
-    endif()
     if(NOT MSVC_VERSION LESS 1600)
       set(HAVE_STDINT_H 1)
     else()

CMakeLists.txt

@@ -1297,8 +1297,6 @@ foreach(CURL_TEST
     HAVE_BOOL_T
     STDC_HEADERS
     HAVE_FILE_OFFSET_BITS
-    HAVE_VARIADIC_MACROS_C99
-    HAVE_VARIADIC_MACROS_GCC
     HAVE_ATOMIC
     )
   curl_internal_test(${CURL_TEST})

acinclude.m4

@@ -1374,70 +1374,6 @@ int main()
 ])
 
 
-dnl CURL_CHECK_VARIADIC_MACROS
-dnl -------------------------------------------------
-dnl Check compiler support of variadic macros
-
-AC_DEFUN([CURL_CHECK_VARIADIC_MACROS], [
-  AC_CACHE_CHECK([for compiler support of C99 variadic macro style],
-    [curl_cv_variadic_macros_c99], [
-    AC_COMPILE_IFELSE([
-      AC_LANG_PROGRAM([[
-#define c99_vmacro3(first, ...) fun3(first, __VA_ARGS__)
-#define c99_vmacro2(first, ...) fun2(first, __VA_ARGS__)
-        int fun3(int arg1, int arg2, int arg3);
-        int fun2(int arg1, int arg2);
-        int fun3(int arg1, int arg2, int arg3)
-        { return arg1 + arg2 + arg3; }
-        int fun2(int arg1, int arg2)
-        { return arg1 + arg2; }
-      ]],[[
-        int res3 = c99_vmacro3(1, 2, 3);
-        int res2 = c99_vmacro2(1, 2);
-      ]])
-    ],[
-      curl_cv_variadic_macros_c99="yes"
-    ],[
-      curl_cv_variadic_macros_c99="no"
-    ])
-  ])
-  case "$curl_cv_variadic_macros_c99" in
-    yes)
-      AC_DEFINE_UNQUOTED(HAVE_VARIADIC_MACROS_C99, 1,
-        [Define to 1 if compiler supports C99 variadic macro style.])
-      ;;
-  esac
-  AC_CACHE_CHECK([for compiler support of old gcc variadic macro style],
-    [curl_cv_variadic_macros_gcc], [
-    AC_COMPILE_IFELSE([
-      AC_LANG_PROGRAM([[
-#define gcc_vmacro3(first, args...) fun3(first, args)
-#define gcc_vmacro2(first, args...) fun2(first, args)
-        int fun3(int arg1, int arg2, int arg3);
-        int fun2(int arg1, int arg2);
-        int fun3(int arg1, int arg2, int arg3)
-        { return arg1 + arg2 + arg3; }
-        int fun2(int arg1, int arg2)
-        { return arg1 + arg2; }
-      ]],[[
-        int res3 = gcc_vmacro3(1, 2, 3);
-        int res2 = gcc_vmacro2(1, 2);
-      ]])
-    ],[
-      curl_cv_variadic_macros_gcc="yes"
-    ],[
-      curl_cv_variadic_macros_gcc="no"
-    ])
-  ])
-  case "$curl_cv_variadic_macros_gcc" in
-    yes)
-      AC_DEFINE_UNQUOTED(HAVE_VARIADIC_MACROS_GCC, 1,
-        [Define to 1 if compiler supports old gcc variadic macro style.])
-      ;;
-  esac
-])
-
-
 dnl CURL_CHECK_CA_BUNDLE
 dnl -------------------------------------------------
 dnl Check if a default ca-bundle should be used

configure.ac

@@ -3418,7 +3418,6 @@ dnl default includes
 
 dnl Checks for typedefs, structures, and compiler characteristics.
 AC_C_CONST
-CURL_CHECK_VARIADIC_MACROS
 AC_TYPE_SIZE_T
 
 CURL_CHECK_STRUCT_TIMEVAL

lib/cf-socket.c

@@ -123,6 +123,7 @@ static void nosigpipe(struct Curl_easy *data,
                       curl_socket_t sockfd)
 {
   int onoff = 1;
+  (void)data;
   if(setsockopt(sockfd, SOL_SOCKET, SO_NOSIGPIPE, (void *)&onoff,
                 sizeof(onoff)) < 0) {
 #if !defined(CURL_DISABLE_VERBOSE_STRINGS)

lib/config-dos.h

@@ -122,7 +122,6 @@
   #define HAVE_SIGSETJMP  1
   #define HAVE_SYS_TIME_H 1
   #define HAVE_TERMIOS_H  1
-  #define HAVE_VARIADIC_MACROS_GCC 1
 
 #elif defined(__HIGHC__)
   #define HAVE_SYS_TIME_H 1

lib/config-win32.h

@@ -377,11 +377,6 @@
 /* Windows should not have HAVE_GMTIME_R defined */
 /* #undef HAVE_GMTIME_R */
 
-/* Define if the compiler supports C99 variadic macro style. */
-#if defined(_MSC_VER) && (_MSC_VER >= 1400)
-#define HAVE_VARIADIC_MACROS_C99 1
-#endif
-
 /* Define if the compiler supports the 'long long' data type. */
 #if defined(__MINGW32__) || \
     (defined(_MSC_VER)     && (_MSC_VER     >= 1310)) || \

lib/curl_config.h.cmake

@@ -602,12 +602,6 @@
 /* Define to 1 if you have the <utime.h> header file. */
 #cmakedefine HAVE_UTIME_H 1
 
-/* Define to 1 if compiler supports C99 variadic macro style. */
-#cmakedefine HAVE_VARIADIC_MACROS_C99 1
-
-/* Define to 1 if compiler supports old gcc variadic macro style. */
-#cmakedefine HAVE_VARIADIC_MACROS_GCC 1
-
 /* Define to 1 if you have the windows.h header file. */
 #cmakedefine HAVE_WINDOWS_H 1
 

lib/curl_trc.c

@@ -130,7 +130,7 @@ void Curl_trc_cf_infof(struct Curl_easy *data, struct Curl_cfilter *cf,
                        const char *fmt, ...)
 {
   DEBUGASSERT(cf);
-  if(data && Curl_trc_cf_is_verbose(cf, data)) {
+  if(Curl_trc_cf_is_verbose(cf, data)) {
     va_list ap;
     int len;
     char buffer[MAXINFO + 2];
@@ -228,14 +228,14 @@ CURLcode Curl_trc_init(void)
   if(config) {
     return Curl_trc_opt(config);
   }
-#endif
+#endif /* DEBUGBUILD */
   return CURLE_OK;
 }
-#else /* !CURL_DISABLE_VERBOSE_STRINGS) */
+#else /* defined(CURL_DISABLE_VERBOSE_STRINGS) */
 
 CURLcode Curl_trc_init(void)
 {
   return CURLE_OK;
 }
 
-#endif /* !DEBUGBUILD */
+#endif /* !defined(CURL_DISABLE_VERBOSE_STRINGS) */

lib/curl_trc.h

@@ -123,7 +123,7 @@ void Curl_trc_cf_infof(struct Curl_easy *data, struct Curl_cfilter *cf,
                       const char *fmt, ...);
 #endif
 
-#else /* !CURL_DISABLE_VERBOSE_STRINGS */
+#else /* defined(CURL_DISABLE_VERBOSE_STRINGS) */
 /* All informational messages are not compiled in for size savings */
 
 #define Curl_trc_is_verbose(d)        ((void)(d), FALSE)
@@ -141,6 +141,6 @@ static void Curl_trc_cf_infof(struct Curl_easy *data,
   (void)data; (void)cf; (void)fmt;
 }
 
-#endif /* CURL_DISABLE_VERBOSE_STRINGS */
+#endif /* !defined(CURL_DISABLE_VERBOSE_STRINGS) */
 
 #endif /* HEADER_CURL_TRC_H */