cpu/mips32r2_common: ifdef __attribute__((optimize))

Causes compilation error on Clang

cpu/mips32r2_common/thread_arch.c

@@ -165,7 +165,11 @@ struct linkctx* exctx_find(reg_t id, struct gpctx *gp)
 }
 
 /* unaligned access helper */
-static inline uint32_t __attribute__((optimize("-O3")))
+static inline uint32_t
+#ifndef __clang__
+/* Clang does not support attribute optimize */
+__attribute__((optimize("-O3")))
+#endif
 mem_rw(const void *vaddr)
 {
     uint32_t v;

makefiles/arch/mips.inc.mk

@@ -23,6 +23,10 @@ comma := ,
 #   If symbol has a value, produce a linker argument for that symbol.
 MIPS_HAL_LDFLAGS = $(foreach a,$(priv_symbols),$(if $($a),-Wl$(comma)--defsym$(comma)__$(call lc,$(a))=$($a)))
 
+ifeq ($(ROMABLE),1)
+MIPS_HAL_LDFLAGS += -T bootcode.ld
+endif
+
 # define build specific options
 # Remove -std=gnu99 once the MIPS toolchain headers are updated to include upstream
 # newlib commit 81c17949f0419d1c4fee421c60987ea1149522ae

sys/posix/include/fcntl.h

@@ -15,10 +15,8 @@
  * @see http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/fcntl.h.html
  */
 
-/** @todo Remove ifdef __mips__ special case after
- * [#6639](https://github.com/RIOT-OS/RIOT/pull/6639) is merged */
 #ifndef DOXYGEN
-#if defined(CPU_NATIVE) || MODULE_NEWLIB || defined(__mips__)
+#if defined(CPU_NATIVE) || MODULE_NEWLIB
 /* If building on native or newlib we need to use the system header instead */
 #pragma GCC system_header
 /* without the GCC pragma above #include_next will trigger a pedantic error */

sys/posix/include/sys/statvfs.h

@@ -22,9 +22,7 @@
 #define SYS_STATVFS_H
 
 #include <sys/types.h> /* for fsblkcnt_t, fsfilcnt_t */
-/** @todo Remove ifdef __mips__ special case after
- * [#6639](https://github.com/RIOT-OS/RIOT/pull/6639) is merged */
-#if MODULE_NEWLIB || defined(__mips__)
+#if MODULE_NEWLIB
 /* newlib support for fsblkcnt_t was only recently added to the newlib git
  * repository, commit f3e587d30a9f65d0c6551ad14095300f6e81672e, 15 apr 2016.
  * Will be included in release 2.5.0, around new year 2016/2017.