Add the "--with-cmodel" configure argument

This lets users select the code model when building the tools.

Makefile.in

@@ -44,8 +44,8 @@ ifeq ($(MULTILIB_NAMES),)
 	MULTILIB_NAMES := $(XLEN)
 endif
 
-CFLAGS_FOR_TARGET := $(CFLAGS_FOR_TARGET_EXTRA)
-ASFLAGS_FOR_TARGET := $(ASFLAGS_FOR_TARGET_EXTRA)
+CFLAGS_FOR_TARGET := $(CFLAGS_FOR_TARGET_EXTRA) @cmodel@
+ASFLAGS_FOR_TARGET := $(ASFLAGS_FOR_TARGET_EXTRA) @cmodel@
 GLIBC_TARGET_FLAGS := $(GLIBC_TARGET_FLAGS_EXTRA)
 GLIBC_CC_FOR_TARGET ?= riscv$(XLEN)-unknown-linux-gnu-gcc
 GLIBC_CXX_FOR_TARGET ?= riscv$(XLEN)-unknown-linux-gnu-g++

configure

@@ -584,6 +584,7 @@ PACKAGE_URL=''
 
 ac_subst_vars='LTLIBOBJS
 LIBOBJS
+cmodel
 gcc_checking
 multilib_names
 multilib_flags
@@ -655,6 +656,7 @@ with_arch
 with_abi
 enable_multilib
 enable_gcc_checking
+with_cmodel
 '
       ac_precious_vars='build_alias
 host_alias
@@ -1299,6 +1301,8 @@ Optional Packages:
   --without-PACKAGE       do not use PACKAGE (same as --with-PACKAGE=no)
   --with-arch=rv64imafdc  Sets the base RISC-V ISA, defaults to rv64imafdc
   --with-abi=lp64d        Sets the base RISC-V ABI, defaults to lp64d
+  --with-cmodel           Select the code model to use when building libc and
+                          libgcc [--with-cmodel=medlow]
 
 Some influential environment variables:
   CC          C compiler command
@@ -3304,6 +3308,23 @@ else
 
 fi
 
+
+# Check whether --with-cmodel was given.
+if test "${with_cmodel+set}" = set; then :
+  withval=$with_cmodel;
+else
+  enable_gcc_checking=yes
+
+fi
+
+if test "x$with_cmodel" != x; then :
+  cmodel=-mcmodel=$with_cmodel
+
+else
+  cmodel=-mcmodel=medlow
+
+fi
+
 ac_config_files="$ac_config_files Makefile"
 
 ac_config_files="$ac_config_files scripts/wrapper/awk/awk"

configure.ac

@@ -110,6 +110,16 @@ AS_IF([test "x$enable_gcc_checking" != xno],
 	[AC_SUBST(gcc_checking, --enable-checking=yes)],
 	[AC_SUBST(gcc_checking, --enable-checking=release)])
 
+AC_ARG_WITH(cmodel,
+	[AS_HELP_STRING([--with-cmodel],
+		[Select the code model to use when building libc and libgcc @<:@--with-cmodel=medlow@:>@])],
+	[],
+	[enable_gcc_checking=yes]
+	)
+AS_IF([test "x$with_cmodel" != x],
+	[AC_SUBST(cmodel, -mcmodel=$with_cmodel)],
+	[AC_SUBST(cmodel, -mcmodel=medlow)])
+
 AC_CONFIG_FILES([Makefile])
 AC_CONFIG_FILES([scripts/wrapper/awk/awk], [chmod +x scripts/wrapper/awk])
 AC_CONFIG_FILES([scripts/wrapper/sed/sed], [chmod +x scripts/wrapper/sed])