> > Maybe we can add a check in gcc/configure.ac to see if gcc_cv_ld
> > supports %got_pc_hi20 and adjust the default for -m[no]-explicit-relocs?
> I think this is a good way, I'll look at adding a check.
The following should work. I've tested it locally by building GCC with
both old (2.38 with patch) and new (trunk) Binutils. Ok for trunk?
I simply checked as instead of ld. If as supports explicitly
relocations, the produced .o file won't be supported by an old ld even
if we use -mno-explicit-relocs (because as will generate new relocation
types for la.local etc). So such a mismatch between as and ld can be
considered "completely broken" and we don't need to support it. And,
the Alpha port also check the assembler for the default of -mexplicit-
relocs.
This should be documented in invoke.texi, but currently it does not
mention -mexplicit-relocs for LoongArch at all. So I'll submit the
doclater in another patch.
-- >8 --
The assembly produced with -mexplicit-relocs is not supported by gas <=
2.39. Check if the assembler supports explicit relocations and set the
default accordingly.
gcc/ChangeLog:
* configure.ac (HAVE_AS_EXPLICIT_RELOCS): Define to 1 if the
assembler supports explicit relocation for LoongArch.
* configure: Regenerate.
* config/loongarch/loongarch-opts.h (HAVE_AS_EXPLICIT_RELOCS):
Define to 0 if not defined.
* config/loongarch/genopts/loongarch.opt.in
(TARGET_EXPLICIT_RELOCS): Default to HAVE_AS_EXPLICIT_RELOCS.
* config/loongarch/loongarch.opt: Regenerate.
---
gcc/config/loongarch/genopts/loongarch.opt.in | 2 +-
gcc/config/loongarch/loongarch-opts.h | 4 ++
gcc/config/loongarch/loongarch.opt| 2 +-
gcc/configure | 37 +--
gcc/configure.ac | 7 +++-
5 files changed, 46 insertions(+), 6 deletions(-)
diff --git a/gcc/config/loongarch/genopts/loongarch.opt.in
b/gcc/config/loongarch/genopts/loongarch.opt.in
index 6f39500935d..a571b6b7524 100644
--- a/gcc/config/loongarch/genopts/loongarch.opt.in
+++ b/gcc/config/loongarch/genopts/loongarch.opt.in
@@ -155,7 +155,7 @@ Target Joined RejectNegative UInteger
Var(loongarch_max_inline_memcpy_size) Init
-mmax-inline-memcpy-size=SIZE Set the max size of memcpy to inline, default
is 1024.
mexplicit-relocs
-Target Var(TARGET_EXPLICIT_RELOCS) Init(1)
+Target Var(TARGET_EXPLICIT_RELOCS) Init(HAVE_AS_EXPLICIT_RELOCS)
Use %reloc() assembly operators.
; The code model option names for -mcmodel.
diff --git a/gcc/config/loongarch/loongarch-opts.h
b/gcc/config/loongarch/loongarch-opts.h
index eaa6fc07448..da24ecd2b50 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_EXPLICIT_RELOCS
+#define HAVE_AS_EXPLICIT_RELOCS 0
+#endif
+
#endif /* LOONGARCH_OPTS_H */
diff --git a/gcc/config/loongarch/loongarch.opt
b/gcc/config/loongarch/loongarch.opt
index 7a8c5b44418..9df7e187283 100644
--- a/gcc/config/loongarch/loongarch.opt
+++ b/gcc/config/loongarch/loongarch.opt
@@ -162,7 +162,7 @@ Target Joined RejectNegative UInteger
Var(loongarch_max_inline_memcpy_size) Init
-mmax-inline-memcpy-size=SIZE Set the max size of memcpy to inline, default
is 1024.
mexplicit-relocs
-Target Var(TARGET_EXPLICIT_RELOCS) Init(1)
+Target Var(TARGET_EXPLICIT_RELOCS) Init(HAVE_AS_EXPLICIT_RELOCS)
Use %reloc() assembly operators.
; The code model option names for -mcmodel.
diff --git a/gcc/configure b/gcc/configure
index 62872d132ea..7eb9479ae8e 100755
--- a/gcc/configure
+++ b/gcc/configure
@@ -19674,7 +19674,7 @@ else
lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
lt_status=$lt_dlunknown
cat > conftest.$ac_ext <<_LT_EOF
-#line 19679 "configure"
+#line 19677 "configure"
#include "confdefs.h"
#if HAVE_DLFCN_H
@@ -19780,7 +19780,7 @@ else
lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
lt_status=$lt_dlunknown
cat > conftest.$ac_ext <<_LT_EOF
-#line 19785 "configure"
+#line 19783 "configure"
#include "confdefs.h"
#if HAVE_DLFCN_H
@@ -28771,7 +28771,7 @@ $as_echo "#define HAVE_AS_MARCH_ZIFENCEI 1" >>confdefs.h
fi
;;
- loongarch*-*-*)
+loongarch*-*-*)
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking assembler for
.dtprelword support" >&5
$as_echo_n "checking assembler for .dtprelword support... " >&6; }
if ${gcc_cv_as_loongarch_dtprelword+:} false; then :
@@ -28807,6 +28807,37 @@ 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 explicit
relocation support" >&5
+$as_echo_n "checking assembler for explicit relocation support... " >&6; }
+if
