[gcc r14-5634] LoongArch: Fix libgcc build failure when libc is not available

[gcc r14-5634] LoongArch: Fix libgcc build failure when libc is not available

[Xi Ruoyao]

https://gcc.gnu.org/g:7bf1de918608e2d0b5a3ad0923040acb1819d9a5

commit r14-5634-g7bf1de918608e2d0b5a3ad0923040acb1819d9a5
Author: Xi Ruoyao <xry111@xry111.site>
Date:   Tue Nov 21 09:09:25 2023 +0800

    LoongArch: Fix libgcc build failure when libc is not available
    
    To use int64_t we included <stdint.h> in loongarch-def.h.
    Unfortunately, loongarch-def.h is also used by libgcc etc., causing a
    build failure when building a "stage1" cross compiler at which the
    target libc is not built yet.
    
    As int64_t is used for a C-compatible replacement of HOST_WIDE_INT, it's
    not directly or indirectly referred by the target libraries.  So
    guard everything requiring stdint.h with #if then they'll not block
    target libraries.
    
    gcc/ChangeLog:
    
            * config/loongarch/loongarch-def.h (stdint.h): Guard with #if to
            exclude it for target libraries.
            (loongarch_isa_base_features): Likewise.
            (loongarch_isa): Likewise.
            (loongarch_abi): Likewise.
            (loongarch_target): Likewise.
            (loongarch_cpu_default_isa): Likewise.

Diff:
---
 gcc/config/loongarch/loongarch-def.h | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/gcc/config/loongarch/loongarch-def.h b/gcc/config/loongarch/loongarch-def.h
index af7bd635d6e..851ff864eb2 100644
--- a/gcc/config/loongarch/loongarch-def.h
+++ b/gcc/config/loongarch/loongarch-def.h
@@ -46,7 +46,10 @@ along with GCC; see the file COPYING3.  If not see
 #ifndef LOONGARCH_DEF_H
 #define LOONGARCH_DEF_H
 
+#if !defined(IN_LIBGCC2) && !defined(IN_TARGET_LIBS) && !defined(IN_RTS)
 #include <stdint.h>
+#endif
+
 #include "loongarch-tune.h"
 
 #ifdef __cplusplus
@@ -62,9 +65,11 @@ extern const char* loongarch_isa_base_strings[];
 #define ISA_BASE_LA64V110     1
 #define N_ISA_BASE_TYPES      2
 
+#if !defined(IN_LIBGCC2) && !defined(IN_TARGET_LIBS) && !defined(IN_RTS)
 /* Unlike other arrays, this is defined in loongarch-cpu.cc.  The problem is
    we cannot use the C++ header options.h in loongarch-def.c.  */
 extern int64_t loongarch_isa_base_features[];
+#endif
 
 /* enum isa_ext_* */
 extern const char* loongarch_isa_ext_strings[];
@@ -121,6 +126,7 @@ extern const char* loongarch_cmodel_strings[];
 #define M_OPT_ABSENT(opt_enum)  ((opt_enum) == M_OPT_UNSET)
 
 
+#if !defined(IN_LIBGCC2) && !defined(IN_TARGET_LIBS) && !defined(IN_RTS)
 /* Internal representation of the target.  */
 struct loongarch_isa
 {
@@ -150,6 +156,9 @@ struct loongarch_target
   int cmodel;	    /* CMODEL_ */
 };
 
+extern struct loongarch_isa loongarch_cpu_default_isa[];
+#endif
+
 /* CPU properties.  */
 /* index */
 #define CPU_NATIVE	  0
@@ -162,7 +171,6 @@ struct loongarch_target
 
 /* parallel tables.  */
 extern const char* loongarch_cpu_strings[];
-extern struct loongarch_isa loongarch_cpu_default_isa[];
 extern int loongarch_cpu_issue_rate[];
 extern int loongarch_cpu_multipass_dfa_lookahead[];