From 2719d1e57ba9524b3acdb2b270508704f6306137 Mon Sep 17 00:00:00 2001
From: Ian Lynagh <igloo@earth.li>
Date: Tue, 17 Feb 2009 21:50:48 +0000
Subject: [PATCH] Make versioned ghc and ghci programs on Windows; fixes trac
 #2827

---
 driver/ghc/Makefile  |    5 +-
 driver/ghc/ghc.c     |  154 ++++++++++++++++++++++++++++++++++++++++++++++++++
 driver/ghci/Makefile |   10 +++-
 3 files changed, 167 insertions(+), 2 deletions(-)
 create mode 100644 driver/ghc/ghc.c

diff --git a/driver/ghc/Makefile b/driver/ghc/Makefile
index 4eeb3f9..55167ec 100644
--- a/driver/ghc/Makefile
+++ b/driver/ghc/Makefile
@@ -1,7 +1,10 @@
 TOP=../..
 include $(TOP)/mk/boilerplate.mk
 
-ifneq "$(TARGETPLATFORM)" "i386-unknown-mingw32"
+ifeq "$(TARGETPLATFORM)" "i386-unknown-mingw32"
+C_PROG = ghc-$(ProjectVersion)
+INSTALL_PROGS += $(C_PROG)
+else
 SCRIPT_DIR = $(DESTDIR)$(bindir)
 SCRIPT_BASE = ghc
 SCRIPT_VERSIONED_BASE = $(SCRIPT_BASE)-$(ProjectVersion)
diff --git a/driver/ghc/ghc.c b/driver/ghc/ghc.c
new file mode 100644
index 0000000..3f4a4a5
--- /dev/null
+++ b/driver/ghc/ghc.c
@@ -0,0 +1,154 @@
+/*
+ *
+ * ghc wrapper for Win32 only
+ * 
+ * This wrapper simply invokes ghc.exe
+ *
+ * (c) The GHC Team 2001
+ *
+ * ghc.exe is searched for using the 'normal' search rules
+ * for DLLs / EXEs (i.e., first in the same dir as this wrapper,
+ * then system dirs, then PATH).
+ *
+ * To compile:
+ *
+ *   MSVC:    cl /o ghc.exe /c ghc.c
+ *   mingw:   gcc -o ghc.exe ghc.c
+ *
+ * If you want to associate your own icon with the wrapper,
+ * here's how to do it:
+ *
+ *   * Create a one-line .rc file, ghc.rc (say), containing
+ *          0 ICON "hsicon.ico"
+ *     (subst the string literal for the name of your icon file).
+ *   * Compile it up (assuming the .ico file is in the same dir
+ *     as the .rc file):
+ *
+ *         MSVC:    rc /i. /fo ghc.res ghc.rc 
+ *         mingw:   windres -o ghc.res -i ghc.rc -O coff
+ *
+ *   * Add the resulting .res file to the link line of the wrapper:
+ *
+ *     MSVC:    cl /o ghc.exe /c ghc.c ghc.res
+ *     mingw:   gcc -o ghc.exe ghc.c ghc.res
+ *
+ */
+
+#include <windows.h>
+#include <stdio.h>
+#include <process.h>
+#include <malloc.h>
+#include <stdlib.h>
+#include <signal.h>
+#include <io.h>
+
+#define BINARY_NAME "ghc.exe"
+
+#define errmsg(msg) fprintf(stderr, msg "\n"); fflush(stderr)
+#define errmsg1(msg,val) fprintf(stderr, msg "\n",val); fflush(stderr)
+
+int
+main(int argc, char** argv)
+{
+  TCHAR  binPath[FILENAME_MAX+1];
+  TCHAR  binPathShort[MAX_PATH+1];
+  DWORD  dwSize = FILENAME_MAX;
+  TCHAR* szEnd;
+  int    i;
+  char*  new_cmdline;
+  char   *ptr, *src;
+  unsigned int cmdline_len = 0;
+  char **pp;
+  LPTSTR pp1;
+
+  STARTUPINFO si;
+  PROCESS_INFORMATION pi;
+  
+  ZeroMemory(&pi, sizeof(PROCESS_INFORMATION));
+  ZeroMemory(&si, sizeof(STARTUPINFO));
+  si.cb = sizeof(STARTUPINFO);
+
+  /* Locate the binary we want to start up */
+  if ( !SearchPath(NULL,
+		   BINARY_NAME,
+		   NULL,
+		   dwSize,
+		   (char*)binPath,
+		   &szEnd) ) {
+    errmsg1("%s: Unable to locate ghc.exe", argv[0]);
+    return 1;
+  }
+  
+  dwSize = MAX_PATH;
+  /* Turn the path into short form - LFN form causes problems
+     when passed in argv[0]. */
+  if ( !(GetShortPathName(binPath, binPathShort, dwSize)) ) {
+    errmsg1("%s: Unable to locate ghc.exe", argv[0]);
+    return 1;
+  }
+  
+  /* Compute length of the flattened 'argv' */
+  for(i=1;i<argc;i++) {
+      /* Note: play it safe and quote all argv strings */
+      cmdline_len += 1 + strlen(argv[i]) + 2;
+  }
+  new_cmdline = (char*)malloc(sizeof(char) * (cmdline_len + 1));
+  if (!new_cmdline) {
+      errmsg1("%s: failed to start up ghc.exe; insufficient memory", argv[0]);
+      return 1;
+  }
+  
+  ptr = new_cmdline;
+  for(i=1;i<argc;i++) {
+      *ptr++ = ' ';
+      *ptr++ = '"';
+      src = argv[i];
+      while(*src) {
+	  *ptr++ = *src++;
+      }
+      *ptr++ = '"';
+  }
+  *ptr = '\0';
+  
+  /* Note: Used to use _spawnv(_P_WAIT, ...) here, but it suffered
+     from the parent intercepting console events such as Ctrl-C,
+     which it shouldn't. Installing an ignore-all console handler
+     didn't do the trick either.
+     
+     Irrespective of this issue, using CreateProcess() is preferable,
+     as it makes this wrapper work on both mingw and cygwin.
+  */
+#if 0
+  fprintf(stderr, "Invoking ghc: %s %s\n", binPathShort, new_cmdline); fflush(stderr);
+#endif
+  if (!CreateProcess(binPathShort,
+		     new_cmdline,
+		     NULL,
+		     NULL,
+		     TRUE,
+		     0, /* dwCreationFlags */
+		     NULL, /* lpEnvironment */
+		     NULL, /* lpCurrentDirectory */
+		     &si,  /* lpStartupInfo */
+		     &pi) ) {
+      errmsg1("Unable to start ghc.exe (error code: %lu)", GetLastError());
+      return 1;
+  }
+  /* Disable handling of console events in the parent by dropping its
+   * connection to the console. This has the (minor) downside of not being
+   * able to subsequently emit any error messages to the console.
+   */
+  FreeConsole();
+
+  switch (WaitForSingleObject(pi.hProcess, INFINITE) ) {
+  case WAIT_OBJECT_0:
+      return 0;
+  case WAIT_ABANDONED:
+  case WAIT_FAILED:
+      /* in the event we get any hard errors, bring the child to a halt. */
+      TerminateProcess(pi.hProcess,1);
+      return 1;
+  default:
+      return 1;
+  }
+}
diff --git a/driver/ghci/Makefile b/driver/ghci/Makefile
index 54bd246..8bb2538 100644
--- a/driver/ghci/Makefile
+++ b/driver/ghci/Makefile
@@ -10,19 +10,27 @@ include $(TOP)/mk/boilerplate.mk
 
 ifeq "$(TARGETPLATFORM)" "i386-unknown-mingw32"
 C_PROG = ghci
+C_PROG_VERSIONED = $(C_PROG)-$(ProjectVersion)
 C_OBJS += ghci.res
+
+all :: $(C_PROG_VERSIONED)
+$(C_PROG_VERSIONED) : $(C_PROG)
+	cp $< $@
 else
 C_SRCS=
 endif
 
 ifeq "$(TARGETPLATFORM)" "i386-unknown-mingw32"
-INSTALL_PROGS    += $(C_PROG)
+INSTALL_PROGS    += $(C_PROG) $(C_PROG_VERSIONED)
 GHCII_SCRIPT=$(DESTDIR)$(bindir)/ghcii.sh
+GHCII_SCRIPT_VERSIONED = $(DESTDIR)$(bindir)/ghcii-$(ProjectVersion).sh
 install::
 	$(RM) -f $(GHCII_SCRIPT)
 	echo "#!$(SHELL)"                                  >> $(GHCII_SCRIPT)
 	echo 'exec "$$0"/../ghc --interactive $${1+"$$@"}' >> $(GHCII_SCRIPT)
 	chmod +x $(GHCII_SCRIPT)
+	cp $(GHCII_SCRIPT) $(GHCII_SCRIPT_VERSIONED)
+	chmod +x $(GHCII_SCRIPT_VERSIONED)
 else
 LINK = ghci
 LINK_TARGET = $(LINK)-$(ProjectVersion)
-- 
1.7.10.4