kbuild: support at least non-interactive mode on Windows

without POSIX, kbuild has some trouble compiling its support
executables. Luckily, the parts that really lean on POSIX functionality
are pretty much all only needed when configuring the build
interactively.

When compiling BusyBox for Win32, we do not actually need interactive
configuration at all: we simply choose the default. Therefore, a lot of
the stuff that is typically built for the Kconfig system is totally
unnecessary (such as: compiling documentation via fork()&exec(), changing
the window size, etc).

Liberally put all of the problematic code behind #ifndef __MINGW32__
guards, just to get `make mingw64_defconfig` going in Git for Windows'
SDK (which is a special-purpose version of MSYS2).

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

1 files changed, 21 insertions, 0 deletions

diff --git a/scripts/kconfig/mconf.c b/scripts/kconfig/mconf.c
index e2e6ca8c7..d3ad12d90 100644
--- a/scripts/kconfig/mconf.c
+++ b/scripts/kconfig/mconf.c
@@ -12,8 +12,10 @@
 /* On Darwin, this may be needed to get SIGWINCH: */
 #define _DARWIN_C_SOURCE 1
 
+#ifndef __MINGW32__
 #include <sys/ioctl.h>
 #include <sys/wait.h>
+#endif
 #include <ctype.h>
 #include <errno.h>
 #include <fcntl.h>
@@ -23,7 +25,9 @@
 #include <stdlib.h>
 #include <string.h>
 #include <strings.h> /* for strcasecmp */
+#ifndef __MINGW32__
 #include <termios.h>
+#endif
 #include <unistd.h>
 #include <locale.h>
 
@@ -266,11 +270,15 @@ static char input_buf[4096];
 static const char filename[] = ".config";
 static char *args[1024], **argptr = args;
 static int indent;
+#ifndef __MINGW32__
 static struct termios ios_org;
+#endif
 static int rows = 0, cols = 0;
 static struct menu *current_menu;
 static int child_count;
+#ifndef __MINGW32__
 static int do_resize;
+#endif
 static int single_menu_mode;
 
 static void conf(struct menu *menu);
@@ -290,6 +298,9 @@ static int cprint(const char *fmt, ...);
 
 static void init_wsize(void)
 {
+#ifdef __MINGW32__
+        fprintf(stderr, "Skipping attempt to change window size\n");
+#else
         struct winsize ws;
         char *env;
 
@@ -321,6 +332,7 @@ static void init_wsize(void)
 
         rows -= 4;
         cols -= 5;
+#endif
 }
 
 static void cprint_init(void)
@@ -457,6 +469,10 @@ static void winch_handler(int sig)
 
 static int exec_conf(void)
 {
+#ifdef __MINGW32__
+        fprintf(stderr, "exec_conf not implemented\n");
+        exit(1);
+#else
         int pipefd[2], stat, size;
         sigset_t sset, osset;
 
@@ -530,6 +546,7 @@ static int exec_conf(void)
         sigprocmask(SIG_SETMASK, &osset, NULL);
 
         return WEXITSTATUS(stat);
+#endif
 }
 
 static void search_conf(void)
@@ -1044,7 +1061,9 @@ static void conf_save(void)
 
 static void conf_cleanup(void)
 {
+#ifndef __MINGW32__
         tcsetattr(1, TCSAFLUSH, &ios_org);
+#endif
         unlink(".help.tmp");
         unlink("lxdialog.scrltmp");
 }
@@ -1073,7 +1092,9 @@ int main(int ac, char **av)
                         single_menu_mode = 1;
         }
 
+#ifndef __MINGW32__
         tcgetattr(1, &ios_org);
+#endif
         atexit(conf_cleanup);
         init_wsize();
         conf(&rootmenu);