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, 15 insertions, 0 deletions

diff --git a/scripts/kconfig/conf.c b/scripts/kconfig/conf.c
index ea2446a89..41ac23936 100644
--- a/scripts/kconfig/conf.c
+++ b/scripts/kconfig/conf.c
@@ -153,9 +153,14 @@ static void conf_askvalue(struct symbol *sym, const char *def)
                         break;
                 }
         case set_random:
+#ifdef __MINGW32__
+                fprintf(stderr, "set_random not supported\n");
+                exit(1);
+#else
                 do {
                         val = (tristate)(random() % 3);
                 } while (!sym_tristate_within_range(sym, val));
+#endif
                 switch (val) {
                 case no: line[0] = 'n'; break;
                 case mod: line[0] = 'm'; break;
@@ -366,7 +371,12 @@ static int conf_choice(struct menu *menu)
                                 continue;
                         break;
                 case set_random:
+#ifdef __MINGW32__
+                fprintf(stderr, "set_random not supported\n");
+                exit(1);
+#else
                         def = (random() % cnt) + 1;
+#endif
                 case set_default:
                 case set_yes:
                 case set_mod:
@@ -522,8 +532,13 @@ int main(int ac, char **av)
                         input_mode = set_yes;
                         break;
                 case 'r':
+#ifdef __MINGW32__
+                        fprintf(stderr, "set_random not supported\n");
+                        exit(1);
+#else
                         input_mode = set_random;
                         srandom(time(NULL));
+#endif
                         break;
                 case 'h':
                 case '?':