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/basic/docproc.c b/scripts/basic/docproc.c
index 720098a23..bfc1a9844 100644
--- a/scripts/basic/docproc.c
+++ b/scripts/basic/docproc.c
@@ -38,7 +38,9 @@
 #include <unistd.h>
 #include <limits.h>
 #include <sys/types.h>
+#ifndef __MINGW32__
 #include <sys/wait.h>
+#endif
 //bbox disabled: #include <alloca.h>
 
 /* exitstatus is used to keep track of any failing calls to kernel-doc,
@@ -78,12 +80,24 @@ void usage (void)
  */
 void exec_kernel_doc(char **svec)
 {
+#ifndef __MINGW32__
         pid_t pid;
         int ret;
+#endif
         char *real_filename;
         int rflen;
 
         /* Make sure output generated so far are flushed */
+#ifdef __MINGW32__
+        fflush(stdout);
+        rflen  = strlen(getenv("SRCTREE"));
+        rflen += strlen(KERNELDOCPATH KERNELDOC);
+        real_filename = alloca(rflen + 1);
+        strcpy(real_filename, getenv("SRCTREE"));
+        strcat(real_filename, KERNELDOCPATH KERNELDOC);
+        fprintf(stderr, "NOTIMPL: exec %s\n", real_filename);
+        exit(1);
+#else
         fflush(stdout);
         switch(pid=fork()) {
                 case -1:
@@ -106,6 +120,7 @@ void exec_kernel_doc(char **svec)
                 exitstatus |= WEXITSTATUS(ret);
         else
                 exitstatus = 0xff;
+#endif
 }
 
 /* Types used to create list of all exported symbols in a number of files */