[gcc r12-10170] LoongArch: Check whether binutils supports the relax function. If supported, explicit relocs are tur

[gcc r12-10170] LoongArch: Check whether binutils supports the relax function. If supported, explicit relocs are tur

[LuluCheng]

https://gcc.gnu.org/g:20ef2df1667f04c854a07b736840061c4a62608b

commit r12-10170-g20ef2df1667f04c854a07b736840061c4a62608b
Author: Lulu Cheng <chenglulu@loongson.cn>
Date:   Fri Sep 15 10:22:49 2023 +0800

    LoongArch: Check whether binutils supports the relax function. If supported, explicit relocs are turned off by default.
    
    gcc/ChangeLog:
    
            * config.in: Regenerate.
            * config/loongarch/genopts/loongarch.opt.in: Add compilation option
            mrelax. And set the initial value of explicit-relocs according to the
            detection status.
            * config/loongarch/gnu-user.h: When compiling with -mno-relax, pass the
            --no-relax option to the linker.
            * config/loongarch/loongarch-opts.h (HAVE_AS_MRELAX_OPTION): Define macro.
            * config/loongarch/loongarch.opt: Regenerate.
            * configure: Regenerate.
            * configure.ac: Add detection of support for binutils relax function.
    
    (cherry picked from commit 9bab65a77049edcc7afc59532173206ee816e726)

Diff:
---
 gcc/config.in                                 | 12 +++++++++++
 gcc/config/loongarch/genopts/loongarch.opt.in |  5 +++++
 gcc/config/loongarch/gnu-user.h               |  4 ++--
 gcc/config/loongarch/loongarch-opts.h         |  4 ++++
 gcc/config/loongarch/loongarch.opt            |  5 +++++
 gcc/configure                                 | 31 +++++++++++++++++++++++++++
 gcc/configure.ac                              |  4 ++++
 7 files changed, 63 insertions(+), 2 deletions(-)

diff --git a/gcc/config.in b/gcc/config.in
index cc638759a400..f5b6287a96a7 100644
--- a/gcc/config.in
+++ b/gcc/config.in
@@ -630,6 +630,12 @@
 #endif
 
 
+/* Define if your assembler supports -mrelax option. */
+#ifndef USED_FOR_TARGET
+#undef HAVE_AS_MRELAX_OPTION
+#endif
+
+
 /* Define if your assembler supports .mspabi_attribute. */
 #ifndef USED_FOR_TARGET
 #undef HAVE_AS_MSPABI_ATTRIBUTE
@@ -2214,6 +2220,12 @@
 #endif
 
 
+/* Define which stat syscall is able to handle 64bit indodes. */
+#ifndef USED_FOR_TARGET
+#undef HOST_STAT_FOR_64BIT_INODES
+#endif
+
+
 /* Define as const if the declaration of iconv() needs const. */
 #ifndef USED_FOR_TARGET
 #undef ICONV_CONST
diff --git a/gcc/config/loongarch/genopts/loongarch.opt.in b/gcc/config/loongarch/genopts/loongarch.opt.in
index 61e7d72a0a1e..edc2ed045d79 100644
--- a/gcc/config/loongarch/genopts/loongarch.opt.in
+++ b/gcc/config/loongarch/genopts/loongarch.opt.in
@@ -177,3 +177,8 @@ Enum(cmodel) String(@@STR_CMODEL_EXTREME@@) Value(CMODEL_EXTREME)
 mcmodel=
 Target RejectNegative Joined Enum(cmodel) Var(la_opt_cmodel) Init(CMODEL_NORMAL)
 Specify the code model.
+
+mrelax
+Target Var(loongarch_mrelax) Init(HAVE_AS_MRELAX_OPTION)
+Take advantage of linker relaxations to reduce the number of instructions
+required to materialize symbol addresses.
diff --git a/gcc/config/loongarch/gnu-user.h b/gcc/config/loongarch/gnu-user.h
index f050078da520..28ac8b0e1f63 100644
--- a/gcc/config/loongarch/gnu-user.h
+++ b/gcc/config/loongarch/gnu-user.h
@@ -46,8 +46,8 @@ along with GCC; see the file COPYING3.  If not see
 #define GNU_USER_TARGET_LINK_SPEC \
   "%{G*} %{shared} -m " GNU_USER_LINK_EMULATION \
   "%{!shared: %{static} %{!static: %{rdynamic:-export-dynamic} " \
-  "-dynamic-linker " GNU_USER_DYNAMIC_LINKER "}}"
-
+  "-dynamic-linker " GNU_USER_DYNAMIC_LINKER "}}" \
+  "%{mno-relax: --no-relax}"
 
 /* Similar to standard Linux, but adding -ffast-math support.  */
 #undef GNU_USER_TARGET_MATHFILE_SPEC
diff --git a/gcc/config/loongarch/loongarch-opts.h b/gcc/config/loongarch/loongarch-opts.h
index eaa6fc074482..60e682f57a07 100644
--- a/gcc/config/loongarch/loongarch-opts.h
+++ b/gcc/config/loongarch/loongarch-opts.h
@@ -87,4 +87,8 @@ loongarch_config_target (struct loongarch_target *target,
    while -m[no]-memcpy imposes a global constraint.  */
 #define TARGET_DO_OPTIMIZE_BLOCK_MOVE_P  loongarch_do_optimize_block_move_p()
 
+#ifndef HAVE_AS_MRELAX_OPTION
+#define HAVE_AS_MRELAX_OPTION 0
+#endif
+
 #endif /* LOONGARCH_OPTS_H */
diff --git a/gcc/config/loongarch/loongarch.opt b/gcc/config/loongarch/loongarch.opt
index 3ff0d860413a..78b5e0cc4529 100644
--- a/gcc/config/loongarch/loongarch.opt
+++ b/gcc/config/loongarch/loongarch.opt
@@ -184,3 +184,8 @@ Enum(cmodel) String(extreme) Value(CMODEL_EXTREME)
 mcmodel=
 Target RejectNegative Joined Enum(cmodel) Var(la_opt_cmodel) Init(CMODEL_NORMAL)
 Specify the code model.
+
+mrelax
+Target Var(loongarch_mrelax) Init(HAVE_AS_MRELAX_OPTION)
+Take advantage of linker relaxations to reduce the number of instructions
+required to materialize symbol addresses.
diff --git a/gcc/configure b/gcc/configure
index b4907d258be6..67cdd92a4f39 100755
--- a/gcc/configure
+++ b/gcc/configure
@@ -28871,6 +28871,37 @@ if test $gcc_cv_as_loongarch_dtprelword != yes; then
 $as_echo "#define HAVE_AS_DTPRELWORD 1" >>confdefs.h
 
 fi
+    { $as_echo "$as_me:${as_lineno-$LINENO}: checking assembler for -mrelax option" >&5
+$as_echo_n "checking assembler for -mrelax option... " >&6; }
+if ${gcc_cv_as_loongarch_relax+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  gcc_cv_as_loongarch_relax=no
+  if test x$gcc_cv_as != x; then
+    $as_echo '.text' > conftest.s
+    if { ac_try='$gcc_cv_as $gcc_cv_as_flags -mrelax -o conftest.o conftest.s >&5'
+  { { eval echo "\"\$as_me\":${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_loongarch_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: $gcc_cv_as_loongarch_relax" >&5
+$as_echo "$gcc_cv_as_loongarch_relax" >&6; }
+if test $gcc_cv_as_loongarch_relax = yes; then
+
+$as_echo "#define HAVE_AS_MRELAX_OPTION 1" >>confdefs.h
+
+fi
+
     ;;
     s390*-*-*)
     { $as_echo "$as_me:${as_lineno-$LINENO}: checking assembler for .gnu_attribute support" >&5
diff --git a/gcc/configure.ac b/gcc/configure.ac
index d369c4717b2f..e08ac5f4b49b 100644
--- a/gcc/configure.ac
+++ b/gcc/configure.ac
@@ -5336,6 +5336,10 @@ x:
 	.dtprelword x+0x8000],,
       [AC_DEFINE(HAVE_AS_DTPRELWORD, 1,
 	  [Define if your assembler supports .dtprelword.])])
+    gcc_GAS_CHECK_FEATURE([-mrelax option], gcc_cv_as_loongarch_relax,
+      [-mrelax], [.text],,
+      [AC_DEFINE(HAVE_AS_MRELAX_OPTION, 1,
+		[Define if your assembler supports -mrelax option.])])
     ;;
     s390*-*-*)
     gcc_GAS_CHECK_FEATURE([.gnu_attribute support],