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Build system tweaks; fix use of brk(2)/sbrk(2) feature test

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There is a feature test for brk(2)/sbrk(2), but it was not checked
for in one place in vmbest.c, causing libdll to fail to build on
FreeBSD aarch64 because the features/dll output{...}end block
failed to link. This commit allows libdll to build on that system,
though another mysterious build failure apparently remains.
https://github.com/ksh93/ksh/issues/154

src/lib/libast/include/vmalloc.h,
src/lib/libast/vmalloc/vmbest.c:
- Add missing '#if _mem_sbrk' directives to disable uses of sbrk(2)
  on systems that have removed this deprecated interface.

src/cmd/builtin/features/pty,
src/lib/libast/features/common,
src/lib/libast/features/float,
src/lib/libast/features/lib,
src/lib/libast/features/sfio,
src/lib/libast/features/sizeof:
- Add a fail clause to more 'tst - output{' blocks so they write an
  informative #error directive if they fail to compile and write
  required header identifiers. This should avoid much more obscure
  compile errors later on. (re: e20c0c6b)

.gitignore:
- Add pattern for emacs #backup# files.
This commit is contained in:
Martijn Dekker 2021-01-26 09:45:17 +00:00
parent 856a2bb253
commit e72543a9fa
9 changed files with 26 additions and 2 deletions
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4
src/cmd/builtin/features/pty
View file

@ -54,7 +54,9 @@ tst - output{
}
return 0;
}
}end
}end fail{
echo '#error The output block in src/cmd/builtin/features/pty failed to compile'
}end
extern _getpty char* (int*, int, mode_t, int)
extern openpty int (int*, int*, char*, struct termios*, struct winsize*)