FORTIFY_SOURCE

[Brian Inglis]

On 2018-04-15 13:08, Achim Gratz wrote:
> Brian Inglis writes:
>>> OK, I finally found it in Embed.  EMbed compiles the tests without
>>> optimization and tries to strip the definition, but doesn't expect the
>>> leading "-Wp,".  I have still no idea where _that_ comes from.
>>
>> https://github.com/vim/vim/issues/2068 suggests it may come from PERL_CFLAGS
> 
> Sure, the question is why they use this stage prefix suddenly when they
> didn't before.

Someone who believes in being "explicit" took over or patched something from
someone who prefers staying "generic"; see http://wiki.c2.com/?HolyWar ;^>

You may already know and have tried: https://perldoc.perl.org/perlembed.html
suggests checking the output from:

$ perl -V
...
  Compiler:
    cc='gcc'
    ccflags ='-DPERL_USE_SAFE_PUTENV -U__STRICT_ANSI__ -D_GNU_SOURCE -ggdb -O2
-pipe -Wimplicit-function-declaration
-fdebug-prefix-map=/mnt/share/maint/perl.x86_64/build=/usr/src/debug/perl-5.26.1-1
-fdebug-prefix-map=/mnt/share/maint/perl.x86_64/src/perl-5.26.1=/usr/src/debug/perl-5.26.1-1
-fwrapv -fno-strict-aliasing -fstack-protector-strong -D_FORTIFY_SOURCE=2'
    optimize='-O3'
    cppflags='-DPERL_USE_SAFE_PUTENV -U__STRICT_ANSI__ -D_GNU_SOURCE -ggdb -O2
-pipe -Wimplicit-function-declaration
-fdebug-prefix-map=/mnt/share/maint/perl.x86_64/build=/usr/src/debug/perl-5.26.1-1
-fdebug-prefix-map=/mnt/share/maint/perl.x86_64/src/perl-5.26.1=/usr/src/debug/perl-5.26.1-1
-fwrapv -fno-strict-aliasing -fstack-protector-strong'
...
  Linker and Libraries:
    ld='g++'
    ldflags =' -Wl,--enable-auto-import -Wl,--export-all-symbols
-Wl,--enable-auto-image-base -fstack-protector-strong'
...
$ perl -MExtUtils::Embed -e ccopts -e ldopts; echo
Warning (mostly harmless): No library found for -lcrypt
   -Wl,--enable-auto-import -Wl,--export-all-symbols
-Wl,--enable-auto-image-base -fstack-protector-strong
-L/usr/lib/perl5/5.26/x86_64-cygwin-threads/CORE -lperl -lpthread -ldl
 -DPERL_USE_SAFE_PUTENV -U__STRICT_ANSI__ -D_GNU_SOURCE -ggdb -O2 -pipe
-Wimplicit-function-declaration
-fdebug-prefix-map=/mnt/share/maint/perl.x86_64/build=/usr/src/debug/perl-5.26.1-1
-fdebug-prefix-map=/mnt/share/maint/perl.x86_64/src/perl-5.26.1=/usr/src/debug/perl-5.26.1-1
-fwrapv -fno-strict-aliasing -fstack-protector-strong -D_FORTIFY_SOURCE=2
-I/usr/lib/perl5/5.26/x86_64-cygwin-threads/CORE

-- 
Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada