From 6d90267d40f2cef60414ee31136e16f3dcebac55 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Joakim=20Nohlg=C3=A5rd?= <joakim.nohlgard@eistec.se>
Date: Fri, 10 Jul 2015 11:57:43 +0200
Subject: [PATCH 01/18] cpu/cortexm_common: Use gcc-ar when building with LTO

gcc-ar is a wrapper supplied by gcc for properly handling thin LTO objects.
---
 cpu/Makefile.include.gnu | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/cpu/Makefile.include.gnu b/cpu/Makefile.include.gnu
index a2e5764c5..d3418ea04 100644
--- a/cpu/Makefile.include.gnu
+++ b/cpu/Makefile.include.gnu
@@ -1,7 +1,11 @@
 export GDBPREFIX ?= $(PREFIX)
 export CC = $(PREFIX)gcc
 export CXX = $(PREFIX)g++
+ifeq ($(LTO),1)
+export AR = $(PREFIX)gcc-ar
+else
 export AR = $(PREFIX)ar
+endif
 export AS = $(PREFIX)as
 export LINK = $(PREFIX)gcc
 export SIZE = $(PREFIX)size

From 0e5522950a452e4f0fc5ee4f171622afb4a7cccd Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Joakim=20Nohlg=C3=A5rd?= <joakim.nohlgard@eistec.se>
Date: Tue, 14 Jul 2015 09:34:58 +0200
Subject: [PATCH 02/18] boards/native: Use gcc-ar when building with LTO

---
 boards/native/Makefile.include | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/boards/native/Makefile.include b/boards/native/Makefile.include
index 7a4a472d0..a7c12bcdc 100644
--- a/boards/native/Makefile.include
+++ b/boards/native/Makefile.include
@@ -14,7 +14,11 @@ USEMODULE += native-drivers
 export PREFIX =
 export CC ?= $(PREFIX)gcc
 export CXX ?= $(PREFIX)g++
-export AR ?= $(PREFIX)ar
+ifeq ($(LTO),1)
+export AR = $(PREFIX)gcc-ar
+else
+export AR = $(PREFIX)ar
+endif
 export AS ?= $(PREFIX)as
 export LINK ?= $(PREFIX)gcc
 export SIZE ?= $(PREFIX)size

From efedaa1a4342e46e81e6e817efca62c871a73777 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Joakim=20Nohlg=C3=A5rd?= <joakim.nohlgard@eistec.se>
Date: Tue, 14 Jul 2015 10:00:01 +0200
Subject: [PATCH 03/18] boards/x86-multiboot-common: Use gcc-ar when building
 with LTO

---
 boards/x86-multiboot-common/Makefile.include | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/boards/x86-multiboot-common/Makefile.include b/boards/x86-multiboot-common/Makefile.include
index 91f95e813..2f0d20648 100644
--- a/boards/x86-multiboot-common/Makefile.include
+++ b/boards/x86-multiboot-common/Makefile.include
@@ -32,7 +32,11 @@ export CPU = x86
 
 # toolchain config
 export CC ?= $(PREFIX)gcc
-export AR ?= $(PREFIX)ar
+ifeq ($(LTO),1)
+export AR = $(PREFIX)gcc-ar
+else
+export AR = $(PREFIX)ar
+endif
 export AS ?= $(PREFIX)as
 export RANLIB ?= $(PREFIX)ranlib
 export LINK ?= $(RIOTBASE)/boards/x86-multiboot-common/dist/link $(PREFIX)gcc

From 5fcb09f6b9a15f834b11970e8d39e4d971f9d64a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Joakim=20Nohlg=C3=A5rd?= <joakim.nohlgard@eistec.se>
Date: Tue, 14 Jul 2015 13:13:13 +0200
Subject: [PATCH 04/18] boards/native/Makefile.include: Add -Wl,--gc-sections
 to linker options

---
 boards/native/Makefile.include | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/boards/native/Makefile.include b/boards/native/Makefile.include
index a7c12bcdc..7f7c4e8b4 100644
--- a/boards/native/Makefile.include
+++ b/boards/native/Makefile.include
@@ -45,7 +45,6 @@ export GPROF ?= gprof
 
 # basic cflags:
 export CFLAGS += -Wall -Wextra -pedantic
-export CFLAGS += -ffunction-sections -fdata-sections
 ifeq ($(shell uname -m),x86_64)
 export CFLAGS += -m32
 endif
@@ -77,6 +76,10 @@ else
 export LINKFLAGS += -ldl
 endif
 
+# clean up unused functions
+export CFLAGS += -ffunction-sections -fdata-sections
+export LINKFLAGS += -Wl,--gc-sections
+
 # set the tap interface for term/valgrind
 ifneq (,$(filter netdev2_tap,$(USEMODULE)))
 	export PORT ?= tap0

From 37eece1961f29525fe74f02551a00de1fc4ff65d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Joakim=20Nohlg=C3=A5rd?= <joakim.nohlgard@eistec.se>
Date: Tue, 14 Jul 2015 14:16:35 +0200
Subject: [PATCH 05/18] cpu/atmega2560/startup.c: Add __attribute__((used)) to
 init functions

---
 cpu/atmega2560/startup.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/cpu/atmega2560/startup.c b/cpu/atmega2560/startup.c
index 2cf66ca27..b53d18f2d 100644
--- a/cpu/atmega2560/startup.c
+++ b/cpu/atmega2560/startup.c
@@ -43,19 +43,20 @@ extern void __libc_init_array(void);
  * which should never be reached but just in case jumps to exit.
  * This way there should be no way to call main directly.
  */
-void init7_ovr(void) __attribute__((naked)) __attribute__((section(".init7")));
-void init8_ovr(void) __attribute__((naked)) __attribute__((section(".init8")));
+void init7_ovr(void) __attribute__((section(".init7")));
+void init8_ovr(void) __attribute__((section(".init8")));
 
 
-void init7_ovr(void)
+__attribute__((used,naked)) void init7_ovr(void)
 {
     __asm__("call reset_handler");
 }
 
-void init8_ovr(void)
+__attribute__((used,naked)) void init8_ovr(void)
 {
     __asm__("jmp exit");
 }
+
 /**
  * @brief This function is the entry point after a system reset
  *
@@ -63,7 +64,7 @@ void init8_ovr(void)
  * 1. initialize the board (sync clock, setup std-IO)
  * 2. initialize and start RIOTs kernel
  */
-void reset_handler(void)
+__attribute__((used)) void reset_handler(void)
 {
     /* initialize the board and startup the kernel */
     board_init();

From db5574044712323c3529d58cf03903deb9d37d97 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Joakim=20Nohlg=C3=A5rd?= <joakim.nohlgard@eistec.se>
Date: Tue, 14 Jul 2015 14:17:13 +0200
Subject: [PATCH 06/18] boards/arduino-mega2560: Add -Wno-error if building
 with LTO

---
 boards/arduino-mega2560/Makefile.include | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/boards/arduino-mega2560/Makefile.include b/boards/arduino-mega2560/Makefile.include
index c9f6ad573..22c75b56d 100644
--- a/boards/arduino-mega2560/Makefile.include
+++ b/boards/arduino-mega2560/Makefile.include
@@ -44,3 +44,10 @@ export ASFLAGS += $(CFLAGS_CPU) $(CFLAGS_DBG)
 export LINKFLAGS += $(CFLAGS_CPU) $(CFLAGS_DBG) $(CFLAGS_OPT) -Wl,--gc-sections -static -lgcc -e reset_handler
 export OFLAGS += -j .text -j .data -O ihex
 export FFLAGS += -p m2560 -c $(PROGRAMMER) $(PROGRAMMER_FLAGS) -F -D -U flash:w:bin/$(BOARD)/$(PROJECT)$(APPLICATION).hex
+
+ifeq ($(LTO),1)
+  # avr-gcc <4.8.3 has a bug when using LTO which causes a warning to be printed always:
+  # '_vector_25' appears to be a misspelled signal handler [enabled by default]
+  # See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59396
+  export LINKFLAGS += -Wno-error
+endif

From 16469543db0406a9b01a49891b7fe219be2386f1 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Joakim=20Nohlg=C3=A5rd?= <joakim.nohlgard@eistec.se>
Date: Tue, 14 Jul 2015 15:02:54 +0200
Subject: [PATCH 07/18] cpu/x86/x86_interrupts.c: Add __attribute__((used)) to
 isr functions

---
 cpu/x86/x86_interrupts.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/cpu/x86/x86_interrupts.c b/cpu/x86/x86_interrupts.c
index cb2da0adf..86991e8a2 100644
--- a/cpu/x86/x86_interrupts.c
+++ b/cpu/x86/x86_interrupts.c
@@ -169,7 +169,7 @@ static void continue_after_intr(void)
 }
 
 static unsigned in_intr_handler = 0, old_intr;
-void x86_int_handler(void)
+__attribute__((used)) void x86_int_handler(void)
 {
     switch (in_intr_handler++) {
         case 0:
@@ -213,7 +213,7 @@ void x86_int_handler(void)
     __builtin_unreachable();
 }
 
-void ASM_FUN_ATTRIBUTES NORETURN x86_int_entry(void)
+__attribute__((used)) void ASM_FUN_ATTRIBUTES NORETURN x86_int_entry(void)
 {
     __asm__ volatile ("mov %eax, (4*0 + x86_interrupted_ctx)");
     __asm__ volatile ("mov %ecx, (4*1 + x86_interrupted_ctx)");
@@ -239,7 +239,7 @@ void ASM_FUN_ATTRIBUTES NORETURN x86_int_entry(void)
     __builtin_unreachable();
 }
 
-void ASM_FUN_ATTRIBUTES NORETURN x86_int_exit(void)
+__attribute__((used)) void ASM_FUN_ATTRIBUTES NORETURN x86_int_exit(void)
 {
     __asm__ volatile ("mov (4*0 + x86_interrupted_ctx), %eax");
     __asm__ volatile ("mov (4*1 + x86_interrupted_ctx), %ecx");

From 4d95f8a0ba96a40bd38ddf07dea382f39a8e32b1 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Joakim=20Nohlg=C3=A5rd?= <joakim.nohlgard@eistec.se>
Date: Tue, 14 Jul 2015 13:13:29 +0200
Subject: [PATCH 08/18] boards/x86-multiboot-common/Makefile.include: Add
 -Wl,--gc-sections to linker options

---
 boards/x86-multiboot-common/Makefile.include | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/boards/x86-multiboot-common/Makefile.include b/boards/x86-multiboot-common/Makefile.include
index 2f0d20648..f10ff1c74 100644
--- a/boards/x86-multiboot-common/Makefile.include
+++ b/boards/x86-multiboot-common/Makefile.include
@@ -50,6 +50,11 @@ LINKFLAGS += -m32 -nostdlib -nostdinc -nostartfiles -nodefaultlibs \
              --prefix=$(NEWLIB_BASE) \
              -Wl,-rpath,$(NEWLIB_BASE)/lib \
              -T$(RIOTBASE)/boards/x86-multiboot-common/linker.ld
+
+# clean up unused functions
+export CFLAGS += -ffunction-sections -fdata-sections
+export LINKFLAGS += -Wl,--gc-sections
+
 UNDEF += $(BINDIR)x86-multiboot-common/startup.o
 
 BASELIBS += $(NEWLIB_BASE)/lib/libc.a \

From 5f313898bf3014e6995a60cd7d9b2af673e49f3e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Joakim=20Nohlg=C3=A5rd?= <joakim.nohlgard@eistec.se>
Date: Tue, 14 Jul 2015 09:17:58 +0200
Subject: [PATCH 09/18] cpu/lpc1768: Add __attribute__((used)) to interrupt
 vector

---
 cpu/lpc1768/vectors.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/cpu/lpc1768/vectors.c b/cpu/lpc1768/vectors.c
index b0ee65a9e..60566cc5c 100644
--- a/cpu/lpc1768/vectors.c
+++ b/cpu/lpc1768/vectors.c
@@ -70,7 +70,7 @@ WEAK_DEFAULT void isr_qei(void);
 WEAK_DEFAULT void isr_pll1(void);
 
 /* interrupt vector table */
-__attribute__ ((section(".vectors")))
+__attribute__ ((used,section(".vectors")))
 const void *interrupt_vector[] = {
     /* Exception stack pointer */
     (void*) (&_estack),             /* pointer to the top of the stack */

From 0ff7652bd6d6975a1db847f1122125343b77082f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Joakim=20Nohlg=C3=A5rd?= <joakim.nohlgard@eistec.se>
Date: Mon, 8 Feb 2016 16:07:22 +0100
Subject: [PATCH 10/18] Makefile.cflags: Make LTO a warning instead of info

(fixes problems with info-boards-supported etc)
---
 Makefile.cflags | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/Makefile.cflags b/Makefile.cflags
index 4e079d0cc..bef46ca72 100644
--- a/Makefile.cflags
+++ b/Makefile.cflags
@@ -42,10 +42,9 @@ endif
 # Unwanted flags for c++
 CXXUWFLAGS += -std=%
 
-ifeq ($(LTO),yes)
-  $(info Building with Link-Time-Optimizations is currently an experimental feature. Expect broken binaries.)
-  LTOFLAGS = -flto -ffat-lto-objects
-  CFLAGS += ${LTOFLAGS}
+ifeq ($(LTO),1)
+  $(warning Building with Link-Time-Optimizations is currently an experimental feature. Expect broken binaries.)
+  LTOFLAGS = -flto
   LINKFLAGS += ${LTOFLAGS}
 endif
 

From afb6cb45079b9d6517ef7ce624887e73b7c87fd5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Joakim=20Nohlg=C3=A5rd?= <joakim.nohlgard@eistec.se>
Date: Mon, 8 Feb 2016 16:34:55 +0100
Subject: [PATCH 11/18] sys/newlib: Add __attribute__((used)) to _fini

No ROM cost, only fixes a linker error with non-nano newlib and LTO enabled.
---
 sys/newlib/syscalls.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/sys/newlib/syscalls.c b/sys/newlib/syscalls.c
index e5384188d..56667e401 100644
--- a/sys/newlib/syscalls.c
+++ b/sys/newlib/syscalls.c
@@ -66,7 +66,8 @@ void _init(void)
 /**
  * @brief Free resources on NewLib de-initialization, not used for RIOT
  */
-void _fini(void)
+/* __attribute__((used)) fixes linker errors when building with LTO, but without nano.specs */
+__attribute__((used)) void _fini(void)
 {
     /* nothing to do here */
 }

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 12/18] 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 98f75964a..04bfec914 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 b7ee2f776..09d6ef720 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.

From 25a6ef527365ad2127db117dc3b82358662ba6dd Mon Sep 17 00:00:00 2001
From: Kaspar Schleiser <kaspar@schleiser.de>
Date: Wed, 10 Aug 2016 16:04:30 +0200
Subject: [PATCH 13/18] core: sched: mark sched_run() as used

---
 core/sched.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/core/sched.c b/core/sched.c
index f34615248..30f5fb3c4 100644
--- a/core/sched.c
+++ b/core/sched.c
@@ -58,7 +58,7 @@ static void (*sched_cb) (uint32_t timestamp, uint32_t value) = NULL;
 schedstat sched_pidlist[KERNEL_PID_LAST + 1];
 #endif
 
-int sched_run(void)
+int __attribute__((used)) sched_run(void)
 {
     sched_context_switch_request = 0;
 

From 0bd2805b0c71cd64bdea77a4b6ee964528dee4a3 Mon Sep 17 00:00:00 2001
From: Kaspar Schleiser <kaspar@schleiser.de>
Date: Wed, 10 Aug 2016 16:04:56 +0200
Subject: [PATCH 14/18] cpu: cortexm_common: explicitly define isr_pendsv and
 isr_svc

---
 cpu/cortexm_common/thread_arch.c | 17 ++++++++---------
 1 file changed, 8 insertions(+), 9 deletions(-)

diff --git a/cpu/cortexm_common/thread_arch.c b/cpu/cortexm_common/thread_arch.c
index e37e48fbe..07d3b86c2 100644
--- a/cpu/cortexm_common/thread_arch.c
+++ b/cpu/cortexm_common/thread_arch.c
@@ -296,17 +296,12 @@ void thread_arch_yield(void)
     SCB->ICSR |= SCB_ICSR_PENDSVSET_Msk;
 }
 
-__attribute__((naked)) void arch_context_switch(void)
-{
+void __attribute__((naked)) __attribute__((used)) isr_pendsv(void) {
     __asm__ volatile (
     /* PendSV handler entry point */
-    ".global isr_pendsv               \n"
-    ".thumb_func                      \n"
-    "isr_pendsv:                      \n"
     /* save context by pushing unsaved registers to the stack */
     /* {r0-r3,r12,LR,PC,xPSR} are saved automatically on exception entry */
     ".thumb_func                      \n"
-    "context_save:"
     "mrs    r0, psp                   \n" /* get stack pointer from user mode */
 #if defined(CPU_ARCH_CORTEX_M0) || defined(CPU_ARCH_CORTEX_M0PLUS)
     "mov    r12, sp                   \n" /* remember the exception SP */
@@ -332,11 +327,15 @@ __attribute__((naked)) void arch_context_switch(void)
     "ldr    r1, =sched_active_thread  \n" /* load address of current tcb */
     "ldr    r1, [r1]                  \n" /* dereference pdc */
     "str    r0, [r1]                  \n" /* write r0 to pdc->sp */
+    "bl     isr_svc                   \n" /* continue with svc */
+    );
+}
+
+void __attribute__((naked)) __attribute__((used)) isr_svc(void) {
+    __asm__ volatile (
     /* SVC handler entry point */
-    /* PendSV will continue from above and through this part as well */
-    ".global isr_svc                  \n"
+    /* PendSV will continue here as well (via jump) */
     ".thumb_func                      \n"
-    "isr_svc:                         \n"
     /* perform scheduling */
     "bl     sched_run                 \n"
     /* restore context and return from exception */

From 5a03f08f91c8439b70053cea39e268fb3fc079fb Mon Sep 17 00:00:00 2001
From: Kaspar Schleiser <kaspar@schleiser.de>
Date: Wed, 10 Aug 2016 16:06:12 +0200
Subject: [PATCH 15/18] cpu: cortexm_common: compile thread_arch.c without LTO

---
 cpu/cortexm_common/Makefile | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/cpu/cortexm_common/Makefile b/cpu/cortexm_common/Makefile
index 48422e909..6b348c14e 100644
--- a/cpu/cortexm_common/Makefile
+++ b/cpu/cortexm_common/Makefile
@@ -1 +1,5 @@
+# thread_arch.c's inline assembler breaks when compiling with link time
+# optimization. see #5774.
+SRC_NOLTO += thread_arch.c
+
 include $(RIOTBASE)/Makefile.base

From 5ab97fe38b310eddf52a97dd0ae411d41db1d84f Mon Sep 17 00:00:00 2001
From: Kaspar Schleiser <kaspar@schleiser.de>
Date: Wed, 10 Aug 2016 16:15:09 +0200
Subject: [PATCH 16/18] cpu: build cortexm vectors.c without LTO

---
 cpu/cc2538/Makefile   | 3 +++
 cpu/cc26x0/Makefile   | 3 +++
 cpu/ezr32wg/Makefile  | 3 +++
 cpu/k64f/Makefile     | 3 +++
 cpu/lm4f120/Makefile  | 3 +++
 cpu/lpc11u34/Makefile | 3 +++
 cpu/lpc1768/Makefile  | 3 +++
 cpu/nrf51/Makefile    | 3 +++
 cpu/nrf52/Makefile    | 3 +++
 cpu/sam3/Makefile     | 3 +++
 cpu/samd21/Makefile   | 3 +++
 cpu/saml21/Makefile   | 3 +++
 cpu/stm32f0/Makefile  | 3 +++
 cpu/stm32f1/Makefile  | 3 +++
 cpu/stm32f3/Makefile  | 3 +++
 cpu/stm32f4/Makefile  | 3 +++
 cpu/stm32l1/Makefile  | 3 +++
 17 files changed, 51 insertions(+)

diff --git a/cpu/cc2538/Makefile b/cpu/cc2538/Makefile
index 849491f76..5d00c79fa 100644
--- a/cpu/cc2538/Makefile
+++ b/cpu/cc2538/Makefile
@@ -9,4 +9,7 @@ ifneq (,$(filter cc2538_rf,$(USEMODULE)))
     DIRS += radio
 endif
 
+# (file triggers compiler bug. see #5775)
+SRC_NOLTO += vectors.c
+
 include $(RIOTBASE)/Makefile.base
diff --git a/cpu/cc26x0/Makefile b/cpu/cc26x0/Makefile
index 67506e130..40dc0d8f0 100644
--- a/cpu/cc26x0/Makefile
+++ b/cpu/cc26x0/Makefile
@@ -4,4 +4,7 @@ MODULE = cpu
 # Add a list of subdirectories, that should also be built:
 DIRS = periph $(RIOTCPU)/cortexm_common
 
+# (file triggers compiler bug. see #5775)
+SRC_NOLTO += vectors.c
+
 include $(RIOTBASE)/Makefile.base
diff --git a/cpu/ezr32wg/Makefile b/cpu/ezr32wg/Makefile
index 21f0d1871..edc9a57a6 100644
--- a/cpu/ezr32wg/Makefile
+++ b/cpu/ezr32wg/Makefile
@@ -4,4 +4,7 @@ MODULE = cpu
 # add a list of subdirectories, that should also be build
 DIRS = periph $(RIOTCPU)/cortexm_common
 
+# (file triggers compiler bug. see #5775)
+SRC_NOLTO += vectors.c
+
 include $(RIOTBASE)/Makefile.base
diff --git a/cpu/k64f/Makefile b/cpu/k64f/Makefile
index 12ba41f9c..68605a469 100644
--- a/cpu/k64f/Makefile
+++ b/cpu/k64f/Makefile
@@ -4,4 +4,7 @@ MODULE = cpu
 # add a list of subdirectories, that should also be build
 DIRS = periph $(RIOTCPU)/cortexm_common $(KINETIS_COMMON)
 
+# (file triggers compiler bug. see #5775)
+SRC_NOLTO += vectors.c
+
 include $(RIOTBASE)/Makefile.base
diff --git a/cpu/lm4f120/Makefile b/cpu/lm4f120/Makefile
index 21f0d1871..edc9a57a6 100644
--- a/cpu/lm4f120/Makefile
+++ b/cpu/lm4f120/Makefile
@@ -4,4 +4,7 @@ MODULE = cpu
 # add a list of subdirectories, that should also be build
 DIRS = periph $(RIOTCPU)/cortexm_common
 
+# (file triggers compiler bug. see #5775)
+SRC_NOLTO += vectors.c
+
 include $(RIOTBASE)/Makefile.base
diff --git a/cpu/lpc11u34/Makefile b/cpu/lpc11u34/Makefile
index 21f0d1871..edc9a57a6 100644
--- a/cpu/lpc11u34/Makefile
+++ b/cpu/lpc11u34/Makefile
@@ -4,4 +4,7 @@ MODULE = cpu
 # add a list of subdirectories, that should also be build
 DIRS = periph $(RIOTCPU)/cortexm_common
 
+# (file triggers compiler bug. see #5775)
+SRC_NOLTO += vectors.c
+
 include $(RIOTBASE)/Makefile.base
diff --git a/cpu/lpc1768/Makefile b/cpu/lpc1768/Makefile
index 21f0d1871..edc9a57a6 100644
--- a/cpu/lpc1768/Makefile
+++ b/cpu/lpc1768/Makefile
@@ -4,4 +4,7 @@ MODULE = cpu
 # add a list of subdirectories, that should also be build
 DIRS = periph $(RIOTCPU)/cortexm_common
 
+# (file triggers compiler bug. see #5775)
+SRC_NOLTO += vectors.c
+
 include $(RIOTBASE)/Makefile.base
diff --git a/cpu/nrf51/Makefile b/cpu/nrf51/Makefile
index e4e81ca5d..f16a1bd3f 100644
--- a/cpu/nrf51/Makefile
+++ b/cpu/nrf51/Makefile
@@ -9,4 +9,7 @@ ifneq (,$(filter radio_nrfmin,$(USEMODULE)))
     DIRS += radio/nrfmin
 endif
 
+# (file triggers compiler bug. see #5775)
+SRC_NOLTO += vectors.c
+
 include $(RIOTBASE)/Makefile.base
diff --git a/cpu/nrf52/Makefile b/cpu/nrf52/Makefile
index f6c26f69b..7600b5893 100644
--- a/cpu/nrf52/Makefile
+++ b/cpu/nrf52/Makefile
@@ -4,4 +4,7 @@ MODULE = cpu
 # add a list of subdirectories, that should also be build
 DIRS = periph $(RIOTCPU)/cortexm_common $(RIOTCPU)/nrf5x_common
 
+# (file triggers compiler bug. see #5775)
+SRC_NOLTO += vectors.c
+
 include $(RIOTBASE)/Makefile.base
diff --git a/cpu/sam3/Makefile b/cpu/sam3/Makefile
index 21f0d1871..edc9a57a6 100644
--- a/cpu/sam3/Makefile
+++ b/cpu/sam3/Makefile
@@ -4,4 +4,7 @@ MODULE = cpu
 # add a list of subdirectories, that should also be build
 DIRS = periph $(RIOTCPU)/cortexm_common
 
+# (file triggers compiler bug. see #5775)
+SRC_NOLTO += vectors.c
+
 include $(RIOTBASE)/Makefile.base
diff --git a/cpu/samd21/Makefile b/cpu/samd21/Makefile
index 6f9d9482c..f042e7599 100644
--- a/cpu/samd21/Makefile
+++ b/cpu/samd21/Makefile
@@ -4,4 +4,7 @@ MODULE = cpu
 # add a list of subdirectories, that should also be build
 DIRS = periph $(RIOTCPU)/cortexm_common $(RIOTCPU)/sam21_common
 
+# (file triggers compiler bug. see #5775)
+SRC_NOLTO += vectors.c
+
 include $(RIOTBASE)/Makefile.base
diff --git a/cpu/saml21/Makefile b/cpu/saml21/Makefile
index 6f9d9482c..f042e7599 100644
--- a/cpu/saml21/Makefile
+++ b/cpu/saml21/Makefile
@@ -4,4 +4,7 @@ MODULE = cpu
 # add a list of subdirectories, that should also be build
 DIRS = periph $(RIOTCPU)/cortexm_common $(RIOTCPU)/sam21_common
 
+# (file triggers compiler bug. see #5775)
+SRC_NOLTO += vectors.c
+
 include $(RIOTBASE)/Makefile.base
diff --git a/cpu/stm32f0/Makefile b/cpu/stm32f0/Makefile
index 9836e38e6..9ee4ce4e3 100644
--- a/cpu/stm32f0/Makefile
+++ b/cpu/stm32f0/Makefile
@@ -4,4 +4,7 @@ MODULE = cpu
 # add a list of subdirectories, that should also be build
 DIRS = periph $(RIOTCPU)/cortexm_common $(RIOTCPU)/stm32_common
 
+# (file triggers compiler bug. see #5775)
+SRC_NOLTO += vectors.c
+
 include $(RIOTBASE)/Makefile.base
diff --git a/cpu/stm32f1/Makefile b/cpu/stm32f1/Makefile
index 957260e9b..7610bbb5e 100644
--- a/cpu/stm32f1/Makefile
+++ b/cpu/stm32f1/Makefile
@@ -4,4 +4,7 @@ MODULE = cpu
 # add a list of subdirectories, that should also be build
 DIRS += periph $(RIOTCPU)/cortexm_common $(RIOTCPU)/stm32_common
 
+# (file triggers compiler bug. see #5775)
+SRC_NOLTO += vectors.c
+
 include $(RIOTBASE)/Makefile.base
diff --git a/cpu/stm32f3/Makefile b/cpu/stm32f3/Makefile
index 9836e38e6..9ee4ce4e3 100644
--- a/cpu/stm32f3/Makefile
+++ b/cpu/stm32f3/Makefile
@@ -4,4 +4,7 @@ MODULE = cpu
 # add a list of subdirectories, that should also be build
 DIRS = periph $(RIOTCPU)/cortexm_common $(RIOTCPU)/stm32_common
 
+# (file triggers compiler bug. see #5775)
+SRC_NOLTO += vectors.c
+
 include $(RIOTBASE)/Makefile.base
diff --git a/cpu/stm32f4/Makefile b/cpu/stm32f4/Makefile
index 9836e38e6..9ee4ce4e3 100644
--- a/cpu/stm32f4/Makefile
+++ b/cpu/stm32f4/Makefile
@@ -4,4 +4,7 @@ MODULE = cpu
 # add a list of subdirectories, that should also be build
 DIRS = periph $(RIOTCPU)/cortexm_common $(RIOTCPU)/stm32_common
 
+# (file triggers compiler bug. see #5775)
+SRC_NOLTO += vectors.c
+
 include $(RIOTBASE)/Makefile.base
diff --git a/cpu/stm32l1/Makefile b/cpu/stm32l1/Makefile
index 957260e9b..7610bbb5e 100644
--- a/cpu/stm32l1/Makefile
+++ b/cpu/stm32l1/Makefile
@@ -4,4 +4,7 @@ MODULE = cpu
 # add a list of subdirectories, that should also be build
 DIRS += periph $(RIOTCPU)/cortexm_common $(RIOTCPU)/stm32_common
 
+# (file triggers compiler bug. see #5775)
+SRC_NOLTO += vectors.c
+
 include $(RIOTBASE)/Makefile.base

From 76fc7a56c94f631273e42a0038d3ece1840c2c0c Mon Sep 17 00:00:00 2001
From: Kaspar Schleiser <kaspar@schleiser.de>
Date: Mon, 29 Aug 2016 17:24:02 +0200
Subject: [PATCH 17/18] cpu: kw2x: rename vector.c -> vectors.c, add to
 SRC_NOLTO

---
 cpu/kw2x/Makefile                | 3 +++
 cpu/kw2x/Makefile.include        | 2 +-
 cpu/kw2x/{vector.c => vectors.c} | 0
 3 files changed, 4 insertions(+), 1 deletion(-)
 rename cpu/kw2x/{vector.c => vectors.c} (100%)

diff --git a/cpu/kw2x/Makefile b/cpu/kw2x/Makefile
index 12ba41f9c..68605a469 100644
--- a/cpu/kw2x/Makefile
+++ b/cpu/kw2x/Makefile
@@ -4,4 +4,7 @@ MODULE = cpu
 # add a list of subdirectories, that should also be build
 DIRS = periph $(RIOTCPU)/cortexm_common $(KINETIS_COMMON)
 
+# (file triggers compiler bug. see #5775)
+SRC_NOLTO += vectors.c
+
 include $(RIOTBASE)/Makefile.base
diff --git a/cpu/kw2x/Makefile.include b/cpu/kw2x/Makefile.include
index 9d48993ba..14bbd8edf 100644
--- a/cpu/kw2x/Makefile.include
+++ b/cpu/kw2x/Makefile.include
@@ -19,6 +19,6 @@ export CFLAGS += -DCPU_ARCH_$(ARCH)
 export COMMON_STARTUP = $(KINETIS_COMMON)
 
 # add the CPU specific system calls implementations for the linker
-export UNDEF += $(BINDIR)cpu/vector.o
+export UNDEF += $(BINDIR)cpu/vectors.o
 
 include $(RIOTCPU)/Makefile.include.cortexm_common
diff --git a/cpu/kw2x/vector.c b/cpu/kw2x/vectors.c
similarity index 100%
rename from cpu/kw2x/vector.c
rename to cpu/kw2x/vectors.c

From d1198b489dc4c169ea62929b60cdca86f75017ac Mon Sep 17 00:00:00 2001
From: Kaspar Schleiser <kaspar@schleiser.de>
Date: Mon, 29 Aug 2016 17:25:20 +0200
Subject: [PATCH 18/18] cpu: k60: rename vector.c -> vectors.c, add to
 SRC_NOLTO

---
 cpu/k60/Makefile                | 3 +++
 cpu/k60/Makefile.include        | 2 +-
 cpu/k60/{vector.c => vectors.c} | 0
 3 files changed, 4 insertions(+), 1 deletion(-)
 rename cpu/k60/{vector.c => vectors.c} (100%)

diff --git a/cpu/k60/Makefile b/cpu/k60/Makefile
index 12ba41f9c..68605a469 100644
--- a/cpu/k60/Makefile
+++ b/cpu/k60/Makefile
@@ -4,4 +4,7 @@ MODULE = cpu
 # add a list of subdirectories, that should also be build
 DIRS = periph $(RIOTCPU)/cortexm_common $(KINETIS_COMMON)
 
+# (file triggers compiler bug. see #5775)
+SRC_NOLTO += vectors.c
+
 include $(RIOTBASE)/Makefile.base
diff --git a/cpu/k60/Makefile.include b/cpu/k60/Makefile.include
index f6f2bac00..a76b56d46 100644
--- a/cpu/k60/Makefile.include
+++ b/cpu/k60/Makefile.include
@@ -19,7 +19,7 @@ export CFLAGS += -DCPU_ARCH_$(ARCH)
 export COMMON_STARTUP = $(KINETIS_COMMON)
 
 # add the CPU specific system calls implementations for the linker
-export UNDEF += $(BINDIR)cpu/vector.o
+export UNDEF += $(BINDIR)cpu/vectors.o
 export UNDEF += $(BINDIR)cpu/ssp.o
 
 include $(RIOTCPU)/Makefile.include.cortexm_common
diff --git a/cpu/k60/vector.c b/cpu/k60/vectors.c
similarity index 100%
rename from cpu/k60/vector.c
rename to cpu/k60/vectors.c