mips: Fix up mips*-sde-elf* build [PR112300]

As reported in the PR, mipsisa64r2-sde-elf doesn't build because HEAP_TRAMPOLINES_INIT
macro isn't defined anywhere.
It is normally defined by
 # Figure out if we need to enable heap trampolines by default
 case ${target} in
 *-*-darwin2*)
   # Currently, we do this for macOS 11 and above.
   tm_defines="$tm_defines HEAP_TRAMPOLINES_INIT=1"
   ;;
 *)
   tm_defines="$tm_defines HEAP_TRAMPOLINES_INIT=0"
   ;;
 esac
in config.gcc, but mips*-sde-elf* is the only target which overwrites
tm_defines shell variable rather than just appending to it (or in one case
prepending), all other targets append something to it, including other
mips* triplets.
I believe (just from looking at config.gcc) that the difference is that
LIBC_GLIBC=1 LIBC_UCLIBC=2 LIBC_BIONIC=3 LIBC_MUSL=4 HEAP_TRAMPOLINES_INIT=0
isn't defined without the patch and is with the patch.

I think defining those first 4 shouldn't cause any harm and defining the
last one is required for it to actually build at all.

2023-11-27  Jakub Jelinek  <jakub@redhat.com>

	PR target/112300
	* config.gcc (mips*-sde-elf*): Append to tm_defines rather than
	overwriting them.

diff --git a/gcc/config.gcc b/gcc/config.gcc
index 0791f195981a369f4c4fd9da1bfe4dc310df0d70..3000379cafc20759049135531d5d24544ecdd23b 100644 (file)
--- a/gcc/config.gcc
+++ b/gcc/config.gcc
@@ -2681,22 +2681,22 @@ mips*-sde-elf*)
        esac
        case ${target} in
          mipsisa32r6*)
-           tm_defines="MIPS_ISA_DEFAULT=MIPS_ISA_MIPS32R6 MIPS_ABI_DEFAULT=ABI_32"
+           tm_defines="${tm_defines} MIPS_ISA_DEFAULT=MIPS_ISA_MIPS32R6 MIPS_ABI_DEFAULT=ABI_32"
            ;;
          mipsisa32r2*)
-           tm_defines="MIPS_ISA_DEFAULT=MIPS_ISA_MIPS32R2 MIPS_ABI_DEFAULT=ABI_32"
+           tm_defines="${tm_defines} MIPS_ISA_DEFAULT=MIPS_ISA_MIPS32R2 MIPS_ABI_DEFAULT=ABI_32"
            ;;
          mipsisa32*)
-           tm_defines="MIPS_ISA_DEFAULT=MIPS_ISA_MIPS32 MIPS_ABI_DEFAULT=ABI_32"
+           tm_defines="${tm_defines} MIPS_ISA_DEFAULT=MIPS_ISA_MIPS32 MIPS_ABI_DEFAULT=ABI_32"
            ;;
          mipsisa64r6*)
-           tm_defines="MIPS_ISA_DEFAULT=MIPS_ISA_MIPS64R6 MIPS_ABI_DEFAULT=ABI_N32"
+           tm_defines="${tm_defines} MIPS_ISA_DEFAULT=MIPS_ISA_MIPS64R6 MIPS_ABI_DEFAULT=ABI_N32"
            ;;
          mipsisa64r2*)
-           tm_defines="MIPS_ISA_DEFAULT=MIPS_ISA_MIPS64R2 MIPS_ABI_DEFAULT=ABI_N32"
+           tm_defines="${tm_defines} MIPS_ISA_DEFAULT=MIPS_ISA_MIPS64R2 MIPS_ABI_DEFAULT=ABI_N32"
            ;;
          mipsisa64*)
-           tm_defines="MIPS_ISA_DEFAULT=MIPS_ISA_MIPS64 MIPS_ABI_DEFAULT=ABI_N32"
+           tm_defines="${tm_defines} MIPS_ISA_DEFAULT=MIPS_ISA_MIPS64 MIPS_ABI_DEFAULT=ABI_N32"
            ;;
        esac
        ;;