[tlbuild] [PATCH 1/1] Fix -Wimplicit-int, -Wstrict-prototypes

[Sam James]

A few more -Wimplicit-int, -Wstrict-prototypes, and -Wimplicit-function-declaration
fixes. Clang 16 makes -Wimplicit-int and -Wimplicit-function-declarations
error out by default, and -Wstrict-prototypes is futureproofing for C23.

(I've sent the relevant parts upstream for vendored projects, including
for my last changes, but it's a lot easier if fixing texlive at the same
time so I can do more builds to find more problems in other software which
depends on it.)
---
 libs/freetype2/freetype-src/builds/unix/freetype2.m4 | 2 +-
 libs/gd/libgd-src/tests/xpm/bug00185.c               | 2 +-
 texk/ps2pk/basename.c                                | 3 ++-
 utils/m-tx/mtx-src/prepmx.c                          | 2 +-
 utils/pmx/pmx-src/libf2c/main.c                      | 2 +-
 5 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/libs/freetype2/freetype-src/builds/unix/freetype2.m4 b/libs/freetype2/freetype-src/builds/unix/freetype2.m4
index 0cafc8e8c..51843f5fa 100644
--- a/libs/freetype2/freetype-src/builds/unix/freetype2.m4
+++ b/libs/freetype2/freetype-src/builds/unix/freetype2.m4
@@ -121,7 +121,7 @@ AC_DEFUN([AC_CHECK_FT2],
 #include <stdlib.h>
 
 int
-main()
+main(void)
 {
   FT_Library library;
   FT_Error  error;
diff --git a/libs/gd/libgd-src/tests/xpm/bug00185.c b/libs/gd/libgd-src/tests/xpm/bug00185.c
index 3056ed950..37659d6a4 100644
--- a/libs/gd/libgd-src/tests/xpm/bug00185.c
+++ b/libs/gd/libgd-src/tests/xpm/bug00185.c
@@ -5,7 +5,7 @@
 
 /* To check memory leaks, run such as 'valgrind --leak-check=full ./bug00185' */
 int
-main()
+main(void)
 {
 	gdImagePtr im;
 	char *path;
diff --git a/texk/ps2pk/basename.c b/texk/ps2pk/basename.c
index 624b74677..094ac811d 100644
--- a/texk/ps2pk/basename.c
+++ b/texk/ps2pk/basename.c
@@ -6,11 +6,12 @@
  * AUTHOR:  Piet Tutelaers
  * VERSION: 1.0 (Sept. 1995)
  */
+#include <stdlib.h>     /* exit() */
 #include <stdio.h>	/* printf() */
 #include "basics.h"	/* fatal() */
 #include "filenames.h"	/* basename() */
 
-main(int argc, char **argv)
+int main(int argc, char **argv)
 {
    if (argc < 2 || argc > 3) 
       fatal("Usage: basename string [suffix]\n");
diff --git a/utils/m-tx/mtx-src/prepmx.c b/utils/m-tx/mtx-src/prepmx.c
index 01525a129..246fec931 100644
--- a/utils/m-tx/mtx-src/prepmx.c
+++ b/utils/m-tx/mtx-src/prepmx.c
@@ -769,7 +769,7 @@ Static void topOfPMXfile(void)
 }
 
 
-main(int argc, Char *argv[])
+int main(int argc, Char *argv[])
 {  /* ---- Main program ------------------------ */
   PASCAL_MAIN(argc, argv);
   strcpy(this_version, version);
diff --git a/utils/pmx/pmx-src/libf2c/main.c b/utils/pmx/pmx-src/libf2c/main.c
index 453974904..f485a0cd0 100644
--- a/utils/pmx/pmx-src/libf2c/main.c
+++ b/utils/pmx/pmx-src/libf2c/main.c
@@ -106,7 +106,7 @@ char **xargv;
 #ifdef KR_headers
 main(argc, argv) int argc; char **argv;
 #else
-main(int argc, char **argv)
+int main(int argc, char **argv)
 #endif
 {
 xargc = argc;
-- 
2.38.1