wafhelpers/check_strerror.py

   1 # Copyright the NTPsec project contributors
   2 #
   3 # SPDX-License-Identifier: BSD-2-Clause
   4
   5 # check to see if strerror_r has type char*
   6
   7 # streror_r() has 2 APIs.
   8 # our environment doesn't make a clean choice.
   9
  10 # There is code for mystrerror() in the bottom of msyslog.c
  11 # This code tried to setup a #define for STRERROR_CHAR
  12 # if strerror_r() returns char* rather than int
  13
  14 # Unfortunately, this test code compiles in the other case.
  15 # It generates a warning on the type conversion from char* to int,
  16 # but that's only a warning, so it "works".
  17
  18 # This uses -Werror which may not be portable.
  19
  20 # Another possibility is to run the test code,
  21 # and have it check for 0/NULL which the int mode should return.
  22
  23
  24 STRERROR_FRAG = """
  25 #include <string.h>
  26 int main(void) {
  27   char buf [100];
  28   const char *foo = strerror_r(6, buf, sizeof(buf));
  29   return foo == NULL;
  30 }
  31 """
  32
  33
  34 def check_strerror(ctx):
  35     old_CFLAGS = ctx.env.CFLAGS
  36     ctx.env.CFLAGS = ["-Werror"] + ctx.env.CFLAGS
  37     ctx.check_cc(
  38         fragment=STRERROR_FRAG,
  39         define_name="STRERROR_CHAR",
  40         features="c",
  41         msg="Checking if strerror_r returns char*",
  42         mandatory=False,
  43         comment="Whether strerror_r returns char*"
  44     )
  45     ctx.env.CFLAGS = old_CFLAGS