diff --git a/STM32F1/cores/maple/ext_interrupts.h b/STM32F1/cores/maple/ext_interrupts.h
index ce1ca03..a406868 100644
--- a/STM32F1/cores/maple/ext_interrupts.h
+++ b/STM32F1/cores/maple/ext_interrupts.h
@@ -106,7 +106,7 @@ void detachInterrupt(uint8 pin);
  *
  * @see noInterrupts()
  */
-static __always_inline void interrupts() {
+static inline __always_inline void interrupts() {
     nvic_globalirq_enable();
 }
 
@@ -120,7 +120,7 @@ static __always_inline void interrupts() {
  *
  * @see interrupts()
  */
-static __always_inline void noInterrupts() {
+static inline __always_inline void noInterrupts() {
     nvic_globalirq_disable();
 }
 
diff --git a/STM32F1/cores/maple/libmaple/exti.c b/STM32F1/cores/maple/libmaple/exti.c
index f8ee8c3..402bec6 100644
--- a/STM32F1/cores/maple/libmaple/exti.c
+++ b/STM32F1/cores/maple/libmaple/exti.c
@@ -250,7 +250,7 @@ void __irq_exti15_10(void) {
  * won't actually be cleared in time and the ISR will fire again.  To
  * compensate, this function NOPs for 2 cycles after clearing the
  * pending bits to ensure it takes effect. */
-static __always_inline void clear_pending_msk(uint32 exti_msk) {
+static inline __always_inline void clear_pending_msk(uint32 exti_msk) {
     EXTI_BASE->PR = exti_msk;
     asm volatile("nop");
     asm volatile("nop");
@@ -258,7 +258,7 @@ static __always_inline void clear_pending_msk(uint32 exti_msk) {
 
 /* This dispatch routine is for non-multiplexed EXTI lines only; i.e.,
  * it doesn't check EXTI_PR. */
-static __always_inline void dispatch_single_exti(uint32 exti) {
+static inline __always_inline void dispatch_single_exti(uint32 exti) {
     voidArgumentFuncPtr handler = exti_channels[exti].handler;
 
     if (!handler) {
@@ -270,7 +270,7 @@ static __always_inline void dispatch_single_exti(uint32 exti) {
 }
 
 /* Dispatch routine for EXTIs which share an IRQ. */
-static __always_inline void dispatch_extis(uint32 start, uint32 stop) {
+static inline __always_inline void dispatch_extis(uint32 start, uint32 stop) {
     uint32 pr = EXTI_BASE->PR;
     uint32 handled_msk = 0;
     uint32 exti;
diff --git a/STM32F1/system/libmaple/dma_private.h b/STM32F1/system/libmaple/dma_private.h
index c0ee11f..f3765fc 100644
--- a/STM32F1/system/libmaple/dma_private.h
+++ b/STM32F1/system/libmaple/dma_private.h
@@ -37,7 +37,7 @@
 /* Wrap this in an ifdef to shut up GCC. (We provide DMA_GET_HANDLER
  * in the series support files, which need dma_irq_handler().) */
 #ifdef DMA_GET_HANDLER
-static __always_inline void dma_irq_handler(dma_dev *dev, dma_tube tube) {
+static inline __always_inline void dma_irq_handler(dma_dev *dev, dma_tube tube) {
 
     void (*handler)(void) = DMA_GET_HANDLER(dev, tube);
     if (handler) {
diff --git a/STM32F1/system/libmaple/include/libmaple/libmaple_types.h b/STM32F1/system/libmaple/include/libmaple/libmaple_types.h
index 882a910..398b705 100644
--- a/STM32F1/system/libmaple/include/libmaple/libmaple_types.h
+++ b/STM32F1/system/libmaple/include/libmaple/libmaple_types.h
@@ -57,8 +57,12 @@ typedef void (*voidArgumentFuncPtr)(void *);
 #define __packed __attribute__((__packed__))
 #define __deprecated __attribute__((__deprecated__))
 #define __weak __attribute__((weak))
-#define __always_inline inline __attribute__((always_inline))
+#ifndef __always_inline
+#define __always_inline __attribute__((always_inline))
+#endif
+#ifndef __unused
 #define __unused __attribute__((unused))
+#endif
 
 #ifndef NULL
 #define NULL 0
diff --git a/STM32F1/system/libmaple/include/libmaple/nvic.h b/STM32F1/system/libmaple/include/libmaple/nvic.h
index 4642363..69d9a91 100644
--- a/STM32F1/system/libmaple/include/libmaple/nvic.h
+++ b/STM32F1/system/libmaple/include/libmaple/nvic.h
@@ -109,14 +109,14 @@ void nvic_sys_reset();
 /**
  * Enables interrupts and configurable fault handlers (clear PRIMASK).
  */
-static __always_inline void nvic_globalirq_enable() {
+static inline __always_inline void nvic_globalirq_enable() {
     asm volatile("cpsie i");
 }
 
 /**
  * Disable interrupts and configurable fault handlers (set PRIMASK).
  */
-static __always_inline void nvic_globalirq_disable() {
+static inline __always_inline void nvic_globalirq_disable() {
     asm volatile("cpsid i");
 }
 
diff --git a/STM32F1/system/libmaple/include/libmaple/usb_cdcacm.h b/STM32F1/system/libmaple/include/libmaple/usb_cdcacm.h
index 13e1bac..62c9181 100644
--- a/STM32F1/system/libmaple/include/libmaple/usb_cdcacm.h
+++ b/STM32F1/system/libmaple/include/libmaple/usb_cdcacm.h
@@ -169,7 +169,7 @@ int usb_cdcacm_get_n_data_bits(void); /* bDataBits */
 
 void usb_cdcacm_set_hooks(unsigned hook_flags, void (*hook)(unsigned, void*));
 
-static __always_inline void usb_cdcacm_remove_hooks(unsigned hook_flags) {
+static inline __always_inline void usb_cdcacm_remove_hooks(unsigned hook_flags) {
     usb_cdcacm_set_hooks(hook_flags, 0);
 }
 
diff --git a/STM32F1/system/libmaple/stm32f1/include/series/gpio.h b/STM32F1/system/libmaple/stm32f1/include/series/gpio.h
index 04376fe..aff639b 100644
--- a/STM32F1/system/libmaple/stm32f1/include/series/gpio.h
+++ b/STM32F1/system/libmaple/stm32f1/include/series/gpio.h
@@ -484,7 +484,7 @@ typedef exti_num afio_exti_num;
 /**
  * @brief Deprecated. Use exti_select(exti, port) instead.
  */
-static __always_inline void afio_exti_select(exti_num exti, exti_cfg port) {
+static inline __always_inline void afio_exti_select(exti_num exti, exti_cfg port) {
     exti_select(exti, port);
 }
 
diff --git a/STM32F1/system/libmaple/stm32f1/include/series/spi.h b/STM32F1/system/libmaple/stm32f1/include/series/spi.h
index d288a0c..ec4821c 100644
--- a/STM32F1/system/libmaple/stm32f1/include/series/spi.h
+++ b/STM32F1/system/libmaple/stm32f1/include/series/spi.h
@@ -75,7 +75,7 @@ extern void spi_config_gpios(struct spi_dev*, uint8,
  * @brief Deprecated. Use spi_config_gpios() instead.
  * @see spi_config_gpios()
  */
-static __always_inline void spi_gpio_cfg(uint8 as_master,
+static inline __always_inline void spi_gpio_cfg(uint8 as_master,
                                          struct gpio_dev *nss_dev,
                                          uint8 nss_bit,
                                          struct gpio_dev *comm_dev,
diff --git a/STM32F1/system/libmaple/stm32f2/include/series/dma.h b/STM32F1/system/libmaple/stm32f2/include/series/dma.h
index 43bd1a2..56725e5 100644
--- a/STM32F1/system/libmaple/stm32f2/include/series/dma.h
+++ b/STM32F1/system/libmaple/stm32f2/include/series/dma.h
@@ -707,7 +707,7 @@ void dma_set_mem_n_addr(dma_dev *dev, dma_tube tube, int n,
  * @param tube Tube whose memory 0 address to set
  * @param addr Address to use as memory 0
  */
-static __always_inline void
+static inline __always_inline void
 dma_set_mem0_addr(dma_dev *dev, dma_tube tube, __io void *addr) {
     dma_set_mem_n_addr(dev, tube, 0, addr);
 }
@@ -720,13 +720,13 @@ dma_set_mem0_addr(dma_dev *dev, dma_tube tube, __io void *addr) {
  * @param tube Tube whose memory 1 address to set
  * @param addr Address to use as memory 1
  */
-static __always_inline void
+static inline __always_inline void
 dma_set_mem1_addr(dma_dev *dev, dma_tube tube, __io void *addr) {
     dma_set_mem_n_addr(dev, tube, 1, addr);
 }
 
 /* Assume the user means SM0AR in a non-double-buffered configuration. */
-static __always_inline void
+static inline __always_inline void
 dma_set_mem_addr(dma_dev *dev, dma_tube tube, __io void *addr) {
     dma_set_mem0_addr(dev, tube, addr);
 }
@@ -743,7 +743,7 @@ static inline dma_xfer_size dma_get_per_size(dma_dev *dev, dma_tube tube) {
 void dma_enable_fifo(dma_dev *dev, dma_tube tube);
 void dma_disable_fifo(dma_dev *dev, dma_tube tube);
 
-static __always_inline int dma_is_fifo_enabled(dma_dev *dev, dma_tube tube) {
+static inline __always_inline int dma_is_fifo_enabled(dma_dev *dev, dma_tube tube) {
     return dma_tube_regs(dev, tube)->SFCR & DMA_SFCR_DMDIS;
 }
 
@@ -769,7 +769,7 @@ static __always_inline int dma_is_fifo_enabled(dma_dev *dev, dma_tube tube) {
  * I can't imagine why ST didn't just use a byte for each group. The
  * bits fit, and it would have made functions like these simpler and
  * faster.  Oh well. */
-static __always_inline uint32 _dma_sr_fcr_shift(dma_tube tube) {
+static inline __always_inline uint32 _dma_sr_fcr_shift(dma_tube tube) {
     switch (tube) {
     case DMA_S0:                /* fall through */
     case DMA_S4:
diff --git a/STM32F1/system/libmaple/timer_private.h b/STM32F1/system/libmaple/timer_private.h
index 320c636..55e2caf 100644
--- a/STM32F1/system/libmaple/timer_private.h
+++ b/STM32F1/system/libmaple/timer_private.h
@@ -121,7 +121,7 @@
  * line may be shared with another timer. For example, the timer 1
  * update interrupt shares an IRQ line with the timer 10 interrupt on
  * STM32F1 (XL-density), STM32F2, and STM32F4. */
-static __always_inline void dispatch_single_irq(timer_dev *dev,
+static inline __always_inline void dispatch_single_irq(timer_dev *dev,
                                                 timer_interrupt_id iid,
                                                 uint32 irq_mask) {
     timer_bas_reg_map *regs = (dev->regs).bas;
@@ -145,15 +145,15 @@ static __always_inline void dispatch_single_irq(timer_dev *dev,
         }                                                               \
     } while (0)
 
-static __always_inline void dispatch_adv_brk(timer_dev *dev) {
+static inline __always_inline void dispatch_adv_brk(timer_dev *dev) {
     dispatch_single_irq(dev, TIMER_BREAK_INTERRUPT, TIMER_SR_BIF);
 }
 
-static __always_inline void dispatch_adv_up(timer_dev *dev) {
+static inline __always_inline void dispatch_adv_up(timer_dev *dev) {
     dispatch_single_irq(dev, TIMER_UPDATE_INTERRUPT, TIMER_SR_UIF);
 }
 
-static __always_inline void dispatch_adv_trg_com(timer_dev *dev) {
+static inline __always_inline void dispatch_adv_trg_com(timer_dev *dev) {
     timer_adv_reg_map *regs = (dev->regs).adv;
     uint32 dsr = regs->DIER & regs->SR;
     void (**hs)(void) = dev->handlers;
@@ -168,7 +168,7 @@ static __always_inline void dispatch_adv_trg_com(timer_dev *dev) {
     regs->SR &= ~handled;
 }
 
-static __always_inline void dispatch_adv_cc(timer_dev *dev) {
+static inline __always_inline void dispatch_adv_cc(timer_dev *dev) {
     timer_adv_reg_map *regs = (dev->regs).adv;
     uint32 dsr = regs->DIER & regs->SR;
     void (**hs)(void) = dev->handlers;
@@ -182,7 +182,7 @@ static __always_inline void dispatch_adv_cc(timer_dev *dev) {
     regs->SR &= ~handled;
 }
 
-static __always_inline void dispatch_general(timer_dev *dev) {
+static inline __always_inline void dispatch_general(timer_dev *dev) {
     timer_gen_reg_map *regs = (dev->regs).gen;
     uint32 dsr = regs->DIER & regs->SR;
     void (**hs)(void) = dev->handlers;
@@ -200,7 +200,7 @@ static __always_inline void dispatch_general(timer_dev *dev) {
 
 /* On F1 (XL-density), F2, and F4, TIM9 and TIM12 are restricted
  * general-purpose timers with update, CC1, CC2, and TRG interrupts. */
-static __always_inline void dispatch_tim_9_12(timer_dev *dev) {
+static inline __always_inline void dispatch_tim_9_12(timer_dev *dev) {
     timer_gen_reg_map *regs = (dev->regs).gen;
     uint32 dsr = regs->DIER & regs->SR;
     void (**hs)(void) = dev->handlers;
@@ -216,7 +216,7 @@ static __always_inline void dispatch_tim_9_12(timer_dev *dev) {
 
 /* On F1 (XL-density), F2, and F4, timers 10, 11, 13, and 14 are
  * restricted general-purpose timers with update and CC1 interrupts. */
-static __always_inline void dispatch_tim_10_11_13_14(timer_dev *dev) {
+static inline __always_inline void dispatch_tim_10_11_13_14(timer_dev *dev) {
     timer_gen_reg_map *regs = (dev->regs).gen;
     uint32 dsr = regs->DIER & regs->SR;
     void (**hs)(void) = dev->handlers;
@@ -228,7 +228,7 @@ static __always_inline void dispatch_tim_10_11_13_14(timer_dev *dev) {
     regs->SR &= ~handled;
 }
 
-static __always_inline void dispatch_basic(timer_dev *dev) {
+static inline __always_inline void dispatch_basic(timer_dev *dev) {
     dispatch_single_irq(dev, TIMER_UPDATE_INTERRUPT, TIMER_SR_UIF);
 }
 
diff --git a/STM32F1/system/libmaple/usart_private.h b/STM32F1/system/libmaple/usart_private.h
index 9bc0527..21cb045 100644
--- a/STM32F1/system/libmaple/usart_private.h
+++ b/STM32F1/system/libmaple/usart_private.h
@@ -37,7 +37,7 @@
 #include <libmaple/ring_buffer.h>
 #include <libmaple/usart.h>
 
-static __always_inline void usart_irq(ring_buffer *rb, usart_reg_map *regs) {
+static inline __always_inline void usart_irq(ring_buffer *rb, usart_reg_map *regs) {
     /* We can get RXNE and ORE interrupts here. Only RXNE signifies
      * availability of a byte in DR.
      *