X-Git-Url: https://git.lizzy.rs/?a=blobdiff_plain;f=Makefile.in;h=9e87ce1d9e69a198cfc87d5f200cb82be5bba46c;hb=4a298dde7238335a9a78bf9041c534350f10bf91;hp=9d8fdd0de62b2ebfb598078b064235e813cebd14;hpb=324a356d78adc9224add453960f32040278b3d6c;p=rust.git

diff --git a/Makefile.in b/Makefile.in
index 9d8fdd0de62..9e87ce1d9e6 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -62,6 +62,8 @@
 #   * tidy - Basic style check, show highest rustc error code and
 #     the status of language and lib features
 #   * rustc-stage$(stage) - Only build up to a specific stage
+#   * $host/stage1/bin/rustc - Only build stage1 rustc, not libstd. For further
+#     information see "Rust recipes for build system success" below.
 #
 # Then mix in some of these environment variables to harness the
 # ultimate power of The Rust Build System.
@@ -93,6 +95,15 @@
 #     // Modifying libstd? Use this command to run unit tests just on your change
 #     make check-stage1-std NO_REBUILD=1 NO_BENCH=1
 #
+#     // Modifying just rustc?
+#     // Compile rustc+libstd once
+#     make rustc-stage1
+#     // From now on use this command to rebuild just rustc and reuse the previously built libstd
+#     // $host is a target triple, eg. x86_64-unknown-linux-gnu
+#     // The resulting binary is located at $host/stage1/bin/rustc.
+#     // If there are any issues with libstd recompile it with the command above.
+#     make $host/stage1/bin/rustc
+#
 #     // Added a run-pass test? Use this to test running your test
 #     make check-stage1-rpass TESTNAME=my-shiny-new-test
 #
@@ -266,7 +277,9 @@ endif
 
 # CTAGS building
 ifneq ($(strip $(findstring TAGS.emacs,$(MAKECMDGOALS)) \
-               $(findstring TAGS.vi,$(MAKECMDGOALS))),)
+               $(findstring TAGS.vi,$(MAKECMDGOALS)) \
+               $(findstring TAGS.rustc.emacs,$(MAKECMDGOALS)) \
+               $(findstring TAGS.rustc.vi,$(MAKECMDGOALS))),)
   CFG_INFO := $(info cfg: including ctags rules)
   include $(CFG_SRC_DIR)mk/ctags.mk
 endif