Hi,
While looking into ways to improve my build system (prevent it from breaking
when moving headers) I came across the -MP option.
Since tcc currently doesn't support I've written a small patch to enable it.
Please note that tcc's '-MP' implies '-MD' while gcc complains.
- bauen1
>From 8b3c7b6039de993f9f7b2aa05b36b7403b13e839 Mon Sep 17 00:00:00 2001
From: bauen1 <j24...@gmail.com>
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
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