>From 8b3c7b6039de993f9f7b2aa05b36b7403b13e839 Mon Sep 17 00:00:00 2001
From: bauen1 <address@hidden>
Date: Sat, 1 Feb 2020 11:54:50 +0100
Subject: [PATCH] Added -MP option

Please note that gcc will complain about using -MP without -MD but in
this patch -MD is implied by -MP
---
 libtcc.c     |  5 +++++
 tcc-doc.texi |  4 ++++
 tcc.c        |  1 +
 tcctools.c   | 10 ++++++++++
 4 files changed, 20 insertions(+)

diff --git a/libtcc.c b/libtcc.c
index db30223..f972997 100644
--- a/libtcc.c
+++ b/libtcc.c
@@ -1507,6 +1507,7 @@ enum {
     TCC_OPTION_pipe,
     TCC_OPTION_E,
     TCC_OPTION_MD,
+    TCC_OPTION_MP,
     TCC_OPTION_MF,
     TCC_OPTION_x,
     TCC_OPTION_ar,
@@ -1571,6 +1572,7 @@ static const TCCOption tcc_options[] = {
     { "pipe", TCC_OPTION_pipe, 0},
     { "E", TCC_OPTION_E, 0},
     { "MD", TCC_OPTION_MD, 0},
+    { "MP", TCC_OPTION_MP, 0},
     { "MF", TCC_OPTION_MF, TCC_OPTION_HAS_ARG },
     { "x", TCC_OPTION_x, TCC_OPTION_HAS_ARG },
     { "ar", TCC_OPTION_ar, 0},
@@ -1983,6 +1985,9 @@ reparse:
         case TCC_OPTION_MD:
             s->gen_deps = 1;
             break;
+        case TCC_OPTION_MP:
+            s->gen_deps = 2;
+            break;
         case TCC_OPTION_MF:
             s->deps_outfile = tcc_strdup(optarg);
             break;
diff --git a/tcc-doc.texi b/tcc-doc.texi
index 9266cf1..4407b36 100644
--- a/tcc-doc.texi
+++ b/tcc-doc.texi
@@ -369,6 +369,10 @@ Misc options:
 @item -MD
 Generate makefile fragment with dependencies.
 
+@item -MP
+Generate phony targets for every dependency except the main source file.
+This is typically used to work around make errors when a header file is moved without updating the dependency files.
+
 @item -MF depfile
 Use @file{depfile} as output for -MD.
 
diff --git a/tcc.c b/tcc.c
index 388d353..e726f8d 100644
--- a/tcc.c
+++ b/tcc.c
@@ -69,6 +69,7 @@ static const char help[] =
     "  -nostdlib   do not link with standard crt and libraries\n"
     "  -Bdir       set tcc's private include/library dir\n"
     "  -MD         generate dependency file for make\n"
+    "  -MP         generate phony targets for dependencies for make\n"
     "  -MF file    specify dependency file name\n"
     "  -m32/64     defer to i386/x86_64 cross compiler\n"
     "Tools:\n"
diff --git a/tcctools.c b/tcctools.c
index 1d4424e..1692b4d 100644
--- a/tcctools.c
+++ b/tcctools.c
@@ -539,6 +539,16 @@ ST_FUNC void gen_makedeps(TCCState *s, const char *target, const char *filename)
     fprintf(depout, "%s: \\\n", target);
     for (i=0; i<s->nb_target_deps; ++i)
         fprintf(depout, " %s \\\n", s->target_deps[i]);
+
+    if (s->gen_deps == 2) {
+        fprintf(depout, "\n");
+
+        /* XXX: we need to skip the source file */
+        for (i = 1; i < s->nb_target_deps; i++) {
+            fprintf(depout, "%s: \n\n", s->target_deps[i]);
+        }
+    }
+
     fprintf(depout, "\n");
     fclose(depout);
 }
-- 
2.25.0