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Re: [Patch, avr] Propagate -mrelax gcc driver flag to assembler


On Wed, May 14, 2014 at 12:56:54PM +0200, Rainer Orth wrote:
> Georg-Johann Lay <avr@gjlay.de> writes:
> 
> > Or what about simply that, which works for me:
> >
> >
> > Index: config/avr/avr.h
> > ===================================================================
> > --- config/avr/avr.h    (revision 210276)
> > +++ config/avr/avr.h    (working copy)
> > @@ -512,7 +512,11 @@ extern const char *avr_device_to_sp8 (in
> >      %{!fenforce-eh-specs:-fno-enforce-eh-specs} \
> >      %{!fexceptions:-fno-exceptions}"
> >
> > +#ifdef HAVE_AS_AVR_LINK_RELAX_OPTION
> > +#define ASM_SPEC "%:device_to_as(%{mmcu=*:%*}) %{mrelax:-mlink-relax} "
> > +#else
> >  #define ASM_SPEC "%:device_to_as(%{mmcu=*:%*}) "
> > +#endif
> >
> >  #define LINK_SPEC "\
> >  %{mrelax:--relax\
> 
> Better yet something like
> 
> #ifdef HAVE_AS_AVR_LINK_RELAX_OPTION
> #define LINK_RELAX_SPEC "%{mrelax:-mlink-relax} "
> #else
> #define LINK_RELAX_SPEC ""
> #endif
> 
> #define ASM_SPEC "%:device_to_as(%{mmcu=*:%*}) " LINK_RELAX_SPEC
> 

Does this look ok? I don't have commit access, so could someone commit
this please?

Regards
Senthil

2014-05-15  Senthil Kumar Selvaraj  <senthil_kumar.selvaraj@atmel.com>

	* config/avr/avr.h: Pass on mlink-relax to assembler.
	* configure.ac: Test for mlink-relax assembler support.
	* config.in: Regenerate.
	* configure: Likewise.

diff --git gcc/config.in gcc/config.in
index c0ba36e..1738301 100644
--- gcc/config.in
+++ gcc/config.in
@@ -575,6 +575,12 @@
 #endif
 
 
+/* Define if your assembler supports -mlink-relax option. */
+#ifndef USED_FOR_TARGET
+#undef HAVE_AVR_AS_LINK_RELAX_OPTION
+#endif
+
+
 /* Define to 1 if you have the `clearerr_unlocked' function. */
 #ifndef USED_FOR_TARGET
 #undef HAVE_CLEARERR_UNLOCKED
diff --git gcc/config/avr/avr.h gcc/config/avr/avr.h
index 9d34983..c59c54d 100644
--- gcc/config/avr/avr.h
+++ gcc/config/avr/avr.h
@@ -512,8 +512,14 @@ extern const char *avr_device_to_sp8 (int argc, const char **argv);
     %{!fenforce-eh-specs:-fno-enforce-eh-specs} \
     %{!fexceptions:-fno-exceptions}"
 
-#define ASM_SPEC "%:device_to_as(%{mmcu=*:%*}) "
-  
+#ifdef HAVE_AVR_AS_LINK_RELAX_OPTION
+#define ASM_RELAX_SPEC "%{mrelax:-mlink-relax}"
+#else
+#define ASM_RELAX_SPEC ""
+#endif
+
+#define ASM_SPEC "%:device_to_as(%{mmcu=*:%*}) " ASM_RELAX_SPEC 
+
 #define LINK_SPEC "\
 %{mrelax:--relax\
          %{mpmem-wrap-around:%{mmcu=at90usb8*:--pmem-wrap-around=8k}\
diff --git gcc/configure gcc/configure
index f4db0a0..2812cdb 100755
--- gcc/configure
+++ gcc/configure
@@ -24014,6 +24014,39 @@ $as_echo "#define HAVE_AS_JSRDIRECT_RELOCS 1" >>confdefs.h
 fi
     ;;
 
+  avr-*-*)
+    { $as_echo "$as_me:${as_lineno-$LINENO}: checking assembler for -mlink-relax option" >&5
+$as_echo_n "checking assembler for -mlink-relax option... " >&6; }
+if test "${gcc_cv_as_avr_relax+set}" = set; then :
+  $as_echo_n "(cached) " >&6
+else
+  gcc_cv_as_avr_relax=no
+  if test x$gcc_cv_as != x; then
+    $as_echo '.text' > conftest.s
+    if { ac_try='$gcc_cv_as $gcc_cv_as_flags -mlink-relax -o conftest.o conftest.s >&5'
+  { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+  test $ac_status = 0; }; }
+    then
+	gcc_cv_as_avr_relax=yes
+    else
+      echo "configure: failed program was" >&5
+      cat conftest.s >&5
+    fi
+    rm -f conftest.o conftest.s
+  fi
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $gcc_cv_as_avr_relax" >&5
+$as_echo "$gcc_cv_as_avr_relax" >&6; }
+if test $gcc_cv_as_avr_relax = yes; then
+
+$as_echo "#define HAVE_AVR_AS_LINK_RELAX_OPTION 1" >>confdefs.h
+
+fi
+  ;;
+
   cris-*-*)
     { $as_echo "$as_me:${as_lineno-$LINENO}: checking assembler for -no-mul-bug-abort option" >&5
 $as_echo_n "checking assembler for -no-mul-bug-abort option... " >&6; }
diff --git gcc/configure.ac gcc/configure.ac
index 8f17dfb..49a1f3d 100644
--- gcc/configure.ac
+++ gcc/configure.ac
@@ -3510,6 +3510,13 @@ case "$target" in
   [Define if your assembler supports the lituse_jsrdirect relocation.])])
     ;;
 
+  avr-*-*)
+    gcc_GAS_CHECK_FEATURE([-mlink-relax option], gcc_cv_as_avr_relax,,
+      [-mlink-relax], [.text],,
+      [AC_DEFINE(HAVE_AVR_AS_LINK_RELAX_OPTION, 1,
+		[Define if your assembler supports -mlink-relax option.])])
+  ;;
+
   cris-*-*)
     gcc_GAS_CHECK_FEATURE([-no-mul-bug-abort option],
       gcc_cv_as_cris_no_mul_bug,[2,15,91],


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