[PATCH v1 2/4] LoongArch: Check whether binutils supports the relax function. If supported, explicit relocs are turned off by default.

[Lulu Cheng <chenglulu@loongson.cn>]

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-driver.h (ASM_SPEC): When compiling with
	-mno-relax, pass the -mno-relax option to the assembler.
	* 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 commint 9bab65a77049edcc7afc59532173206ee816e726)
---
 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 cc638759a40..f5b6287a96a 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 61e7d72a0a1..edc2ed045d7 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 f050078da52..28ac8b0e1f6 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 eaa6fc07448..60e682f57a0 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 3ff0d860413..78b5e0cc452 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 b4907d258be..67cdd92a4f3 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 d369c4717b2..e08ac5f4b49 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],
-- 
2.39.3