maint: remove now-unneeded macro definitions

* bootstrap.conf (gnulib_modules): Include gnulib's signal module,
so that signal.h guarantees definition of certain macros.
* src/util.c (SIG_BLOCK, SIG_UNBLOCK, SIG_SETMASK): Remove definition.
Now, gnulib guarantees that these are defined.
* src/common.h (SIZE_MAX): Likewise.
* cfg.mk (local-checks-to-skip): Enable the
sc_prohibit_always-defined_macros check, now that it passes.

4 files changed, 1 insertions, 13 deletions

diff --git a/bootstrap.conf b/bootstrap.conf
index a42d485..607ad1a 100644
--- a/bootstrap.conf
+++ b/bootstrap.conf
@@ -49,6 +49,7 @@ realloc
 rename
 rmdir
 setenv
+signal
 ssize_t
 stat-time
 stdbool
diff --git a/cfg.mk b/cfg.mk
index 3d0f355..11f335b 100644
--- a/cfg.mk
+++ b/cfg.mk
@@ -26,7 +26,6 @@ local-checks-to-skip = \
   sc_file_system \
   sc_immutable_NEWS \
   sc_obsolete_symbols \
-  sc_prohibit_always-defined_macros \
   sc_prohibit_always_true_header_tests \
   sc_prohibit_magic_number_exit \
   sc_prohibit_strcmp \
diff --git a/src/common.h b/src/common.h
index 5597540..43919b8 100644
--- a/src/common.h
+++ b/src/common.h
@@ -39,9 +39,6 @@
 #elif HAVE_STDINT_H
 # include <stdint.h>
 #endif
-#ifndef SIZE_MAX
-#define SIZE_MAX ((size_t) -1)
-#endif
 
 #include <ctype.h>
 /* CTYPE_DOMAIN (C) is nonzero if the unsigned char C can safely be given
diff --git a/src/util.c b/src/util.c
index f1187ff..6950842 100644
--- a/src/util.c
+++ b/src/util.c
@@ -1094,15 +1094,6 @@ static int const sigs[] = {
 #endif
 #define sigaddset(s, sig) (*(s) |= sigmask (sig))
 #define sigismember(s, sig) ((*(s) & sigmask (sig)) != 0)
-#ifndef SIG_BLOCK
-#define SIG_BLOCK 0
-#endif
-#ifndef SIG_UNBLOCK
-#define SIG_UNBLOCK (SIG_BLOCK + 1)
-#endif
-#ifndef SIG_SETMASK
-#define SIG_SETMASK (SIG_BLOCK + 2)
-#endif
 #define sigprocmask(how, n, o) \
   ((how) == SIG_BLOCK \
    ? ((o) ? *(o) = sigblock (*(n)) : sigblock (*(n))) \