[Bug 245511] lang/gcc9: build with base GCC on powerpc64 elfv1

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=245511

--- Comment #2 from [email protected] ---
A commit references this bug:

Author: pkubaj
Date: Sat Apr 25 12:26:35 UTC 2020
New revision: 532950
URL: https://svnweb.freebsd.org/changeset/ports/532950

Log:
  lang/gcc9: build with base GCC on powerpc64 elfv1

  Instead of using lang/gcc8 for bootstrapping gcc9 on powerpc64 elfv1, use
directly base gcc.
  Necessary changes:
  - CFLAGS_FOR_TARGET="-O0" CXXFLAGS_FOR_TARGET="-O0" BOOT_CFLAGS="-O0" in
CONFIGURE_ENV and MAKE_ENV. Otherwise bootstrapped compiler fails later in the
build with segfault.
  - CRTSTUFF_T_CFLAGS has changed optimizations to -O0, instead of -O2. -O2
worked in gcc8, because there was no -fno-asynchronous-unwind-tables flag added
to CRTSTUFF_T_CFLAGS. Since this works when building with clang on powerpc64
elfv2, this patch is added to EXTRA_PATCHES, only on powerpc64 elfv1,
  - BOOT_CFLAGS has added ? before =. This is to allow overriding BOOT_CFLAGS
in CONFIGURE_ENV and MAKE_ENV.
  - A patch by Gustavo Romero to gcc/dumpfile.c is necessary to allow compiling
with base GCC, otherwise base GCC hits ICE. Incidentally, this patch alone also
fixes build for powerpc (32 bits) with base GCC.

  Bump PORTREVISION for dependency change.

  PR:           245511, 242506
  Approved by:  gerald (maintainer timeout)

Changes:
  head/lang/gcc9/Makefile
  head/lang/gcc9/files/extra-patch-libgcc_config_rs6000_t-crtstuff
  head/lang/gcc9/files/patch-Makefile.in
  head/lang/gcc9/files/patch-gcc_dumpfile.c

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