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Disable GCC -Wformat-truncation when suported

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Pass -Wno-format-truncation when this is supported by GCC so silence
warnings like this:

  conf.c: In function ‘Read_Config’:
  conf.c:985:60: warning: ‘snprintf’ output may be truncated before
                 the last format character [-Wformat-truncation=]
    985 |                         snprintf(file, sizeof(file), "%s/%s",
        |                                                            ^
  conf.c:985:25: note: ‘snprintf’ output 2 or more bytes (assuming 257)
                 into a destination of size 256
    985 |                         snprintf(file, sizeof(file), "%s/%s",
        |                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    986 |                                  Conf_IncludeDir, entry->d_name);
        |                                  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

The warning is correct, but this is basically why we use snprintf() in
the first place.
This commit is contained in:
Alexander Barton
2024-01-18 22:39:10 +01:00
parent d702ebab0a
commit 1d527eaf17
1 changed files with 13 additions and 0 deletions
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13
configure.ng
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@@ -125,6 +125,18 @@ main(int argc, char **argv)
])
])
AC_DEFUN([GCC_W_NO_FORMAT_TRUNC],[
result=yes
AC_MSG_CHECKING([whether ${CC} accepts -Wno-format-truncation])
old_cflags="$CFLAGS"
CFLAGS="$CFLAGS -Wno-format-truncation"
AC_LINK_IFELSE([AC_LANG_PROGRAM([],[])],[],[result=no])
echo $result
if test "X$result" = "Xno"; then
CFLAGS="$old_cflags"
fi
])
# -- Hard coded system and compiler dependencies/features/options ... --
if test "$GCC" = "yes"; then
@@ -132,6 +144,7 @@ if test "$GCC" = "yes"; then
CFLAGS="$CFLAGS -pipe -W -Wall -Wpointer-arith -Wstrict-prototypes"
GCC_STACK_PROTECT_CC
GCC_W_NO_FORMAT_TRUNC
fi
case "$host_os" in