[Buildroot] [git commit] Config.in: add -Ofast option

[Thomas Petazzoni]

commit: https://git.buildroot.net/buildroot/commit/?id=ed6a7e18af8f4dfddee6e6b144f20dfaf6926315
branch: https://git.buildroot.net/buildroot/commit/?id=refs/heads/master

-Ofast (introduced in GCC 4.6) It combines the existing optimization level -O3
with options that can affect standards compliance but result in better optimized
code. For example, -Ofast enables -ffast-math.

Signed-off-by: Joshua Henderson <joshua.henderson at microchip.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni at bootlin.com>
---
 Config.in           | 11 +++++++++++
 package/Makefile.in |  3 +++
 2 files changed, 14 insertions(+)

diff --git a/Config.in b/Config.in
index 0002df5176..037ea2265b 100644
--- a/Config.in
+++ b/Config.in
@@ -527,6 +527,17 @@ config BR2_OPTIMIZE_S
 	  -ftree-vect-loop-version
 	  This is the default.
 
+config BR2_OPTIMIZE_FAST
+	bool "optimize for fast"
+	depends on BR2_TOOLCHAIN_GCC_AT_LEAST_4_6
+	help
+	  Optimize for fast. Disregard strict standards
+	  compliance. -Ofast enables all -O3 optimizations. It also
+	  enables optimizations that are not valid for all
+	  standard-compliant programs. It turns on -ffast-math and the
+	  Fortran-specific -fstack-arrays, unless -fmax-stack-var-size
+	  is specified, and -fno-protect-parens.
+
 endchoice
 
 config BR2_GOOGLE_BREAKPAD_ENABLE
diff --git a/package/Makefile.in b/package/Makefile.in
index e387ce67fe..828e12e7d7 100644
--- a/package/Makefile.in
+++ b/package/Makefile.in
@@ -128,6 +128,9 @@ endif
 ifeq ($(BR2_OPTIMIZE_S),y)
 TARGET_OPTIMIZATION = -Os
 endif
+ifeq ($(BR2_OPTIMIZE_FAST),y)
+TARGET_OPTIMIZATION = -Ofast
+endif
 ifeq ($(BR2_DEBUG_1),y)
 TARGET_DEBUGGING = -g1
 endif