From 1f9a87972b4f9184a6488426bc3c12ae43528bfd Mon Sep 17 00:00:00 2001
From: Kaspar Schleiser <kaspar@schleiser.de>
Date: Wed, 10 Aug 2016 16:03:53 +0200
Subject: [PATCH] make: allow per-file conditional LTO compile
---
Makefile.base | 14 +++++++++-----
Makefile.vars | 1 +
2 files changed, 10 insertions(+), 5 deletions(-)
diff --git a/Makefile.base b/Makefile.base
index 98f75964a3..04bfec914c 100644
--- a/Makefile.base
+++ b/Makefile.base
@@ -23,7 +23,7 @@ ${DIRS:%=CLEAN--%}:
"$(MAKE)" -C ${@:CLEAN--%=%} clean
ifeq ($(strip $(SRC)),)
- SRC := $(wildcard *.c)
+ SRC := $(filter-out $(SRC_NOLTO), $(wildcard *.c))
endif
ifeq ($(strip $(SRCXX)),)
SRCXX := $(wildcard *.cpp)
@@ -35,10 +35,12 @@ ifeq ($(strip $(ASSMSRC)),)
ASSMSRC := $(wildcard *.S)
endif
-OBJC := $(SRC:%.c=$(BINDIR)$(MODULE)/%.o)
-OBJCXX := $(SRCXX:%.cpp=$(BINDIR)$(MODULE)/%.o)
-ASMOBJ := $(ASMSRC:%.s=$(BINDIR)$(MODULE)/%.o)
-ASSMOBJ := $(ASSMSRC:%.S=$(BINDIR)$(MODULE)/%.o)
+OBJC_LTO := $(SRC:%.c=$(BINDIR)$(MODULE)/%.o)
+OBJC_NOLTO := $(SRC_NOLTO:%.c=$(BINDIR)$(MODULE)/%.o)
+OBJC := $(OBJC_NOLTO) $(OBJC_LTO)
+OBJCXX := $(SRCXX:%.cpp=$(BINDIR)$(MODULE)/%.o)
+ASMOBJ := $(ASMSRC:%.s=$(BINDIR)$(MODULE)/%.o)
+ASSMOBJ := $(ASSMSRC:%.S=$(BINDIR)$(MODULE)/%.o)
OBJ := $(OBJC) $(OBJCXX) $(ASMOBJ) $(ASSMOBJ)
DEP := $(OBJC:.o=.d) $(OBJCXX:.o=.d) $(ASSMOBJ:.o=.d)
@@ -56,6 +58,8 @@ CXXFLAGS = $(filter-out $(CXXUWFLAGS), $(CFLAGS)) $(CXXEXFLAGS)
# compile and generate dependency info
+$(OBJC_LTO): CFLAGS+=$(LTOFLAGS)
+
$(OBJC): $(BINDIR)$(MODULE)/%.o: %.c $(RIOTBUILD_CONFIG_HEADER_C)
$(AD)$(CCACHE) $(CC) \
-DRIOT_FILE_RELATIVE=\"$(patsubst $(RIOTBASE)/%,%,$(abspath $<))\" \
diff --git a/Makefile.vars b/Makefile.vars
index b7ee2f776d..09d6ef720e 100644
--- a/Makefile.vars
+++ b/Makefile.vars
@@ -35,6 +35,7 @@ export AS # The assembler.
export ASFLAGS # Flags for the assembler.
export LINK # The command used to link the files. Must take the same parameters as GCC, i.e. "ld" won't work.
export LINKFLAGS # Flags to supply in the linking step.
+export LTOFLAGS # extra CFLAGS for compiling with link time optimization
export OBJCOPY # The command used to create the HEXFILE.
export OFLAGS # The parameter for OBJCOPY, e.g. to strip the debug information.
export OBJDUMP # The command used to create the assembly listing.
--
GitLab