Graceful degrade if Binutils PR21472 is not available.

gcc/
	Graceful degrade if Binutils PR21472 is not available.
	PR target/81072
	* configure.ac [target=avr]: WARN instead of ERROR if avrxmega3
	.rodata in flash test fails.
	(HAVE_LD_AVR_AVRXMEGA3_RODATA_IN_FLASH): Define it if test passes.
	* confgure: Regenerate.
	* config.in: Regenerate.
	* config/avr/avr.c (avr_asm_named_section)
	[HAVE_LD_AVR_AVRXMEGA3_RODATA_IN_FLASH]: Only trigger
	__do_copy_data for stuff in .rodata if flash_pm_offset = 0.
	(avr_asm_init_sections): Same.

From-SVN: r250000

5 files changed, 43 insertions, 13 deletions

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index c566a3a..5e1eecd 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,18 @@
+2017-07-05  Georg-Johann Lay  <avr@gjlay.de>
+
+	Graceful degrade if Binutils PR21472 is not available.
+
+	PR target/81072
+	* configure.ac [target=avr]: WARN instead of ERROR if avrxmega3
+	.rodata in flash test fails.
+	(HAVE_LD_AVR_AVRXMEGA3_RODATA_IN_FLASH): Define it if test passes.
+	* confgure: Regenerate.
+	* config.in: Regenerate.
+	* config/avr/avr.c (avr_asm_named_section)
+	[HAVE_LD_AVR_AVRXMEGA3_RODATA_IN_FLASH]: Only trigger
+	__do_copy_data for stuff in .rodata if flash_pm_offset = 0.
+	(avr_asm_init_sections): Same.
+
 2017-07-05  Ramana Radhakrishnan  <ramana.radhakrishnan@arm.com>
 
 	* config/arm/neon.md (fma<VCVTF:mode>4): Remove %?.
diff --git a/gcc/config.in b/gcc/config.in
index bf2aa7b..44c7a68 100644
--- a/gcc/config.in
+++ b/gcc/config.in
@@ -1460,6 +1460,13 @@
 #endif
 
 
+/* Define if your default avr linker script for avrxmega3 leaves .rodata in
+   flash. */
+#ifndef USED_FOR_TARGET
+#undef HAVE_LD_AVR_AVRXMEGA3_RODATA_IN_FLASH
+#endif
+
+
 /* Define if your linker supports -z bndplt */
 #ifndef USED_FOR_TARGET
 #undef HAVE_LD_BNDPLT_SUPPORT
diff --git a/gcc/config/avr/avr.c b/gcc/config/avr/avr.c
index 030a9d9..ba35b9e 100644
--- a/gcc/config/avr/avr.c
+++ b/gcc/config/avr/avr.c
@@ -10000,7 +10000,9 @@ avr_asm_init_sections (void)
      resp. `avr_need_copy_data_p'.  If flash is not mapped to RAM then
      we have also to track .rodata because it is located in RAM then.  */
 
+#if defined HAVE_LD_AVR_AVRXMEGA3_RODATA_IN_FLASH
   if (0 == avr_arch->flash_pm_offset)
+#endif
     readonly_data_section->unnamed.callback = avr_output_data_section_asm_op;
   data_section->unnamed.callback = avr_output_data_section_asm_op;
   bss_section->unnamed.callback = avr_output_bss_section_asm_op;
@@ -10036,7 +10038,10 @@ avr_asm_named_section (const char *name, unsigned int flags, tree decl)
                             || STR_PREFIX_P (name, ".gnu.linkonce.d"));
 
   if (!avr_need_copy_data_p
-      && 0 == avr_arch->flash_pm_offset)
+#if defined HAVE_LD_AVR_AVRXMEGA3_RODATA_IN_FLASH
+      && 0 == avr_arch->flash_pm_offset
+#endif
+      )
     avr_need_copy_data_p = (STR_PREFIX_P (name, ".rodata")
                             || STR_PREFIX_P (name, ".gnu.linkonce.r"));
 
diff --git a/gcc/configure b/gcc/configure
index 317517c..4c5900f 100755
--- a/gcc/configure
+++ b/gcc/configure
@@ -24851,29 +24851,32 @@ EOF
   ac_status=$?
   $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
   test $ac_status = 0; }; }
-    if test -f conftest.nm
+    if test -s conftest.nm
     then
 	if grep ' R xxvaryy' conftest.nm > /dev/null; then
 	    { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
 $as_echo "yes" >&6; }
-	    rm -f conftest.s conftest.o conftest.elf conftest.nm
+
+$as_echo "#define HAVE_LD_AVR_AVRXMEGA3_RODATA_IN_FLASH 1" >>confdefs.h
+
 	else
 	    { $as_echo "$as_me:${as_lineno-$LINENO}: result: no: avrxmega3 .rodata located in RAM" >&5
 $as_echo "no: avrxmega3 .rodata located in RAM" >&6; }
 	    echo "$as_me: nm output was" >&5
 	    cat conftest.nm >&5
-	    rm -f conftest.s conftest.o conftest.elf conftest.nm
 	    avr_ld_ver="`$gcc_cv_ld -v | sed -e 's:^.* ::'`"
-	    as_fn_error "support for avrxmega3 needs Binutils 2.29 or higher (have $avr_ld_ver)" "$LINENO" 5
+	    { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: support for avrxmega3 .rodata in flash needs Binutils 2.29 or higher (have $avr_ld_ver)" >&5
+$as_echo "$as_me: WARNING: support for avrxmega3 .rodata in flash needs Binutils 2.29 or higher (have $avr_ld_ver)" >&2;}
 	fi
     else
 	{ $as_echo "$as_me:${as_lineno-$LINENO}: result: test failed" >&5
 $as_echo "test failed" >&6; }
 	echo "$as_me: failed program was" >&5
 	cat conftest.s >&5
-	rm -f conftest.s conftest.o conftest.elf
-	as_fn_error "see \`config.log' for details" "$LINENO" 5
+	{ $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: see \`config.log' for details" >&5
+$as_echo "$as_me: WARNING: see \`config.log' for details" >&2;}
     fi
+    rm -f conftest.s conftest.o conftest.elf conftest.nm
     ;;
 
   cris-*-*)
diff --git a/gcc/configure.ac b/gcc/configure.ac
index e1b03a9..f50223a 100644
--- a/gcc/configure.ac
+++ b/gcc/configure.ac
@@ -3832,26 +3832,26 @@ EOF
     AC_TRY_COMMAND([$gcc_cv_as -mmcu=avrxmega3 conftest.s -o conftest.o])
     AC_TRY_COMMAND([$gcc_cv_ld -mavrxmega3 conftest.o -o conftest.elf])
     AC_TRY_COMMAND([$gcc_cv_nm conftest.elf > conftest.nm])
-    if test -f conftest.nm
+    if test -s conftest.nm
     then
 	if grep ' R xxvaryy' conftest.nm > /dev/null; then
 	    AC_MSG_RESULT(yes)
-	    rm -f conftest.s conftest.o conftest.elf conftest.nm
+	    AC_DEFINE(HAVE_LD_AVR_AVRXMEGA3_RODATA_IN_FLASH, 1,
+		[Define if your default avr linker script for avrxmega3 leaves .rodata in flash.])
 	else
 	    AC_MSG_RESULT(no: avrxmega3 .rodata located in RAM)
 	    echo "$as_me: nm output was" >&AS_MESSAGE_LOG_FD
 	    cat conftest.nm >&AS_MESSAGE_LOG_FD
-	    rm -f conftest.s conftest.o conftest.elf conftest.nm
 	    avr_ld_ver="`$gcc_cv_ld -v | sed -e 's:^.* ::'`"
-	    AC_MSG_ERROR([[support for avrxmega3 needs Binutils 2.29 or higher (have $avr_ld_ver)]])
+	    AC_MSG_WARN([[support for avrxmega3 .rodata in flash needs Binutils 2.29 or higher (have $avr_ld_ver)]])
 	fi
     else
 	AC_MSG_RESULT(test failed)
 	echo "$as_me: failed program was" >&AS_MESSAGE_LOG_FD
 	cat conftest.s >&AS_MESSAGE_LOG_FD
-	rm -f conftest.s conftest.o conftest.elf
-	AC_MSG_ERROR([[see `config.log' for details]])
+	AC_MSG_WARN([[see `config.log' for details]])
     fi
+    rm -f conftest.s conftest.o conftest.elf conftest.nm
     ;;
 
   cris-*-*)