Disable fixincludes madness

Index: gcc/Makefile.in
--- gcc/Makefile.in.orig
+++ gcc/Makefile.in
@@ -263,9 +263,6 @@ endif
 NO_PIE_CFLAGS = @NO_PIE_CFLAGS@
 NO_PIE_FLAG = @NO_PIE_FLAG@
 
-# We don't want to compile the compilers with -fPIE, it make PCH fail.
-COMPILER += $(NO_PIE_CFLAGS)
-
 # Link with -no-pie since we compile the compiler with -fno-PIE.
 LINKER += $(NO_PIE_FLAG)
 
@@ -784,8 +781,6 @@ NO_PIE_FLAG_FOR_BUILD = @NO_PIE_FLAG_FOR_BUILD@
 BUILD_CFLAGS= @BUILD_CFLAGS@ -DGENERATOR_FILE
 BUILD_CXXFLAGS = @BUILD_CXXFLAGS@ -DGENERATOR_FILE
 BUILD_NO_PIE_CFLAGS = @BUILD_NO_PIE_CFLAGS@
-BUILD_CFLAGS += $(BUILD_NO_PIE_CFLAGS)
-BUILD_CXXFLAGS += $(BUILD_NO_PIE_CFLAGS)
 
 # Native compiler that we use.  This may be C++ some day.
 COMPILER_FOR_BUILD = $(CXX_FOR_BUILD)
@@ -2196,6 +2191,12 @@ DRIVER_DEFINES = \
 CFLAGS-gcc.o += $(DRIVER_DEFINES) -DBASEVER=$(BASEVER_s)
 gcc.o: $(BASEVER)
 
+ISCLANG = $(shell $(CC) --version | grep -c clang)
+
+ifeq ($(ISCLANG),1)
+CFLAGS-insn-attrtab.o += -fbracket-depth=512
+endif
+
 specs.h : s-specs ; @true
 s-specs : Makefile
 	lsf="$(lang_specs_files)"; for f in $$lsf; do \
@@ -3090,7 +3091,7 @@ stmp-fixinc: gsyslimits.h macro_list fixinc_list \
 	      gcc_dir=`${PWD_COMMAND}` ; \
 	      export TARGET_MACHINE srcdir SHELL MACRO_LIST && \
 	      cd $(build_objdir)/fixincludes && \
-	      $(SHELL) ./fixinc.sh "$${gcc_dir}/$${fix_dir}" \
+	      $(SHELL) -c true "$${gcc_dir}/$${fix_dir}" \
 	        $(BUILD_SYSTEM_HEADER_DIR) $(OTHER_FIXINCLUDES_DIRS) ); \
 	    rm -f $${fix_dir}/syslimits.h; \
 	    if [ -f $${fix_dir}/limits.h ]; then \