From: Andi Kleen <a...@gcc.gnu.org>
... that uses -march=native -mtune=native to build a compiler optimized
for the host.
config/ChangeLog:
* bootstrap-native.mk: New file.
gcc/ChangeLog:
* doc/install.texi: Document bootstrap-native.
---
config/bootstrap-native.mk | 1 +
gcc/doc/install.texi | 7 +++++++
2 files changed, 8 insertions(+)
create mode 100644 config/bootstrap-native.mk
diff --git a/config/bootstrap-native.mk b/config/bootstrap-native.mk
new file mode 100644
index 00000000000..a4a3d859408
--- /dev/null
+++ b/config/bootstrap-native.mk
@@ -0,0 +1 @@
+BOOT_CFLAGS := -march=native -mtune=native $(BOOT_CFLAGS)
diff --git a/gcc/doc/install.texi b/gcc/doc/install.texi
index 4973f195daf..04a2256b97a 100644
--- a/gcc/doc/install.texi
+++ b/gcc/doc/install.texi
@@ -3052,6 +3052,13 @@ Removes any @option{-O}-started option from
@code{BOOT_CFLAGS}, and adds
@itemx @samp{bootstrap-Og}
Analogous to @code{bootstrap-O1}.
+@item @samp{bootstrap-native}
+@itemx @samp{bootstrap-native}
+Optimize the compiler code for the build host, if supported by the
+architecture. Note this only affects the compiler, not the targeted
+code. If you want the later, choose options suitable to the target you
+are looking for. For example @samp{--with-cpu} would be a good starting point.
+
@item @samp{bootstrap-lto}
Enables Link-Time Optimization for host tools during bootstrapping.
@samp{BUILD_CONFIG=bootstrap-lto} is equivalent to adding
--
2.47.1
