Log message:
gcc*: fix variable comparison

From RVP in PR 57998.

Log message:
gcc*: include missing header and unbreak build on Linux.

Log message:
gcc*: Disable FORTIFY on Linux only

Log message:
lang/gccX: switch from USE_LANGUAGES=c99 to USE_CC_FEATURES/FORCE_C_STD.

Log message:
lang/gcc*: USE_TOOLS+=sed, not sed:run.

As far as I can tell, gcc needs this at build-time, not at run-time.

https://mail-index.netbsd.org/tech-pkg/2023/06/02/msg027624.html

Log message:
lang/gcc6, lang/gcc7: Make these build with newer gcc.

Otherwise libgomp has some -Wattributes errors.

Log message:
lang/gcc*: Set CC_FOR_BUILD and CXX_FOR_BUILD if cross-compiling.

Verified gcc6 and gcc7 cross-compile on NetBSD, at least if the
gcc-fortran option is disabled.  gcc8 and gcc9 have trouble because
of python (why do these have a full dependency on python?); gcc10 and
gcc12 are missing gcc/config/mips/netbsd64.h; gcc12 and gcc13 have a
cross-compile bug with missing __LIBGCC_*__ macros -- but in any
case, setting CC_FOR_BUILD and CXX_FOR_BUILD is obviously necessary
for cross-compilation.  Conditional on USE_CROSS_COMPILE, so no harm
to native builds.

Log message:
Ignore unreadable directories when looking for libgcc_s.so

Log message:
gcc: Switch binutils to DEPENDS instead of bl3.

Both gcc and binutils ship an ansidecl.h.  Until now this hasn't been a
problem, but the recent binutils 2.39 update ships an ansidecl.h that removes
things like "PTR" which GCC depends on, and it seems as though the binutils
version is being chosen ahead of the in-tree GCC version so the build breaks.

Avoiding buildink3 ensures the headers aren't visible, and the builds are
now progressing further.

Log message:
*: recursive bump for perl 5.36