[patch] Add GNUMAKEFLAGS override to make

[Kris Warkentin]

Hi,

This patch allows a GNUMAKEFLAGS environment variable to override MAKEFLAGS.
The reason for this is because Microsoft's nmake also uses MAKEFLAGS and
this could potentially cause a conflict on hosts with multiple development
environments.

I expect that this isn't the most elegant way to implement this but it is
fairly modular at least.  I basically guessed at the Amiga part since I
don't have that machine handy.  I didn't realize it initially but
getenv/putenv don't modify the environment within the processes address
space once the program is executing hence the mangling of the envp[] array.

cheers,

Kris

--- main.c.old 2002-08-09 21:27:17.000000000 -0400
+++ main.c 2003-07-08 10:19:38.000000000 -0400
@@ -841,6 +841,7 @@
   register struct file *f;
   register unsigned int i;
   char **p;
+  char *gmf;
   struct dep *read_makefiles;
   PATH_VAR (current_directory);
 #ifdef WINDOWS32
@@ -854,6 +855,33 @@
   no_default_sh_exe = 1;
 #endif

+  /* Allow GNUMAKEFLAGS to override MAKEFLAGS.  We unset it after the first
+     call so as to not override it on subsequent calls.  */
+  gmf = getenv("GNUMAKEFLAGS");
+  if(NULL != gmf && '\0' != gmf[0]){
+#ifndef _AMIGA
+    int i = 0;
+    while(envp[i]){
+      if(strncmp(envp[i], "MAKEFLAGS", 9) == 0){
+        /* Mangle MAKEFLAGS so the GNUMAKEFLAGS takes precedence. */
+        sprintf(envp[i],"M4KEF14G5=%s",envp[i] + 10);
+      }
+      else if(strncmp(envp[i], "GNUMAKEFLAGS", 12) == 0){
+        char *tmp = strdup(envp[i] + 3);
+        envp[i] = tmp;
+        putenv(tmp);
+      }
+      i++;
+    }
+#else
+    /* Sufficient for Amiga's ENV: device? */
+    char tmp[1024];
+    sprintf(tmp, "MAKEFLAGS=%s", gmf);
+    putenv(strdup(tmp));
+#endif
+    putenv("GNUMAKEFLAGS=");
+  }
+
   default_goal_file = 0;
   reading_file = 0;

main.c.diff
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