xtensa: don't expect XCHAL_* macros to be constant

Get rid of the assumption that XCHAL_* macros are preprocessor
constants: don't use them in preprocessor conditionals or in static
variable initializers.

2017-06-14  Max Filippov  <jcmvbkbc@gmail.com>
bfd/
	* elf32-xtensa.c (elf_xtensa_be_plt_entry,
	elf_xtensa_le_plt_entry): Add dimension for the ABI to arrays,
	keep both windowed and call0 ABI PLT definitions.
	(elf_xtensa_create_plt_entry): Use selected ABI to choose upper
	elf_xtensa_*_plt_entry endex.
	(ELF_MAXPAGESIZE): Fix at minimal supported MMU page size.

gas/
	* config/tc-xtensa.c (density_supported, xtensa_fetch_width,
	absolute_literals_supported): Leave definitions uninitialized.
	(directive_state): Leave entries for directive_density and
	directive_absolute_literals initialized to false.
	(xg_init_global_config, xtensa_init): New functions.
	* config/tc-xtensa.h (TARGET_BYTES_BIG_ENDIAN): Define as 0.
	(HOST_SPECIAL_INIT): New definition.
	(xtensa_init): New declaration.

3 files changed, 40 insertions, 12 deletions

diff --git a/gas/ChangeLog b/gas/ChangeLog
index a1853a4..f4506ce 100644
--- a/gas/ChangeLog
+++ b/gas/ChangeLog
@@ -1,3 +1,14 @@
+2017-06-14  Max Filippov  <jcmvbkbc@gmail.com>
+
+	* config/tc-xtensa.c (density_supported, xtensa_fetch_width,
+	absolute_literals_supported): Leave definitions uninitialized.
+	(directive_state): Leave entries for directive_density and
+	directive_absolute_literals initialized to false.
+	(xg_init_global_config, xtensa_init): New functions.
+	* config/tc-xtensa.h (TARGET_BYTES_BIG_ENDIAN): Define as 0.
+	(HOST_SPECIAL_INIT): New definition.
+	(xtensa_init): New declaration.
+
 2017-06-07  Michael Collison  <michael.collison@arm.com>
 
 	* config/tc-aarch64.c (reg_entry_reg_names): Add IP0,
diff --git a/gas/config/tc-xtensa.c b/gas/config/tc-xtensa.c
index e1efaae..836b550 100644
--- a/gas/config/tc-xtensa.c
+++ b/gas/config/tc-xtensa.c
@@ -72,13 +72,13 @@ const char FLT_CHARS[] = "rRsSfFdDxXpP";
 /* Flags to indicate whether the hardware supports the density and
    absolute literals options.  */
 
-bfd_boolean density_supported = XCHAL_HAVE_DENSITY;
-bfd_boolean absolute_literals_supported = XSHAL_USE_ABSOLUTE_LITERALS;
+bfd_boolean density_supported;
+bfd_boolean absolute_literals_supported;
 
 static vliw_insn cur_vinsn;
 
 unsigned xtensa_num_pipe_stages;
-unsigned xtensa_fetch_width = XCHAL_INST_FETCH_WIDTH;
+unsigned xtensa_fetch_width;
 
 static enum debug_info_type xt_saved_debug_type = DEBUG_NONE;
 
@@ -419,21 +419,13 @@ bfd_boolean directive_state[] =
 {
   FALSE,			/* none */
   FALSE,			/* literal */
-#if !XCHAL_HAVE_DENSITY
   FALSE,			/* density */
-#else
-  TRUE,				/* density */
-#endif
   TRUE,				/* transform */
   FALSE,			/* freeregs */
   FALSE,			/* longcalls */
   FALSE,			/* literal_prefix */
   FALSE,			/* schedule */
-#if XSHAL_USE_ABSOLUTE_LITERALS
-  TRUE				/* absolute_literals */
-#else
   FALSE				/* absolute_literals */
-#endif
 };
 
 /* A circular list of all potential and actual literal pool locations
@@ -5216,6 +5208,24 @@ md_number_to_chars (char *buf, valueT val, int n)
     number_to_chars_littleendian (buf, val, n);
 }
 
+static void
+xg_init_global_config (void)
+{
+  target_big_endian = XCHAL_HAVE_BE;
+
+  density_supported = XCHAL_HAVE_DENSITY;
+  absolute_literals_supported = XSHAL_USE_ABSOLUTE_LITERALS;
+  xtensa_fetch_width = XCHAL_INST_FETCH_WIDTH;
+
+  directive_state[directive_density] = XCHAL_HAVE_DENSITY;
+  directive_state[directive_absolute_literals] = XSHAL_USE_ABSOLUTE_LITERALS;
+}
+
+void
+xtensa_init (int argc ATTRIBUTE_UNUSED, char **argv ATTRIBUTE_UNUSED)
+{
+  xg_init_global_config ();
+}
 
 /* This function is called once, at assembler startup time.  It should
    set up all the tables, etc. that the MD part of the assembler will
diff --git a/gas/config/tc-xtensa.h b/gas/config/tc-xtensa.h
index 257ca05..912c890 100644
--- a/gas/config/tc-xtensa.h
+++ b/gas/config/tc-xtensa.h
@@ -30,7 +30,7 @@ struct fix;
 #include "xtensa-isa.h"
 #include "xtensa-config.h"
 
-#define TARGET_BYTES_BIG_ENDIAN XCHAL_HAVE_BE
+#define TARGET_BYTES_BIG_ENDIAN 0
 
 
 /* Maximum number of opcode slots in a VLIW instruction.  */
@@ -335,6 +335,13 @@ extern bfd_boolean xtensa_check_inside_bundle (void);
 extern void xtensa_handle_align (fragS *);
 extern char *xtensa_section_rename (const char *);
 
+/* We need to set the target endianness in xtensa_init and not in md_begin.
+   This is because xtensa_target_format is called before md_begin, and we
+   want to have all non-statically initialized fields initialized.  */
+
+#define HOST_SPECIAL_INIT xtensa_init
+extern void xtensa_init (int, char **);
+
 #define TARGET_FORMAT			xtensa_target_format ()
 #define TARGET_ARCH			bfd_arch_xtensa
 #define TC_SEGMENT_INFO_TYPE		xtensa_segment_info