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Detect PG_PRINTF_ATTRIBUTE automatically.

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This eliminates gobs of "unrecognized format function type" warnings
under MinGW compilers predating GCC 4.4.
This commit is contained in:
Noah Misch
2014-11-23 09:34:03 -05:00
parent b62f94c603
commit b779168ffe
5 changed files with 61 additions and 16 deletions
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21
config/c-compiler.m4
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@ -51,6 +51,27 @@ fi
])# PGAC_C_INLINE
# PGAC_C_PRINTF_ARCHETYPE
# -----------------------
# Set the format archetype used by gcc to check printf type functions. We
# prefer "gnu_printf", which includes what glibc uses, such as %m for error
# strings and %lld for 64 bit long longs. GCC 4.4 introduced it. It makes a
# dramatic difference on Windows.
AC_DEFUN([PGAC_PRINTF_ARCHETYPE],
[AC_CACHE_CHECK([for printf format archetype], pgac_cv_printf_archetype,
[ac_save_c_werror_flag=$ac_c_werror_flag
ac_c_werror_flag=yes
AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
[extern int
pgac_write(int ignore, const char *fmt,...)
__attribute__((format(gnu_printf, 2, 3)));], [])],
[pgac_cv_printf_archetype=gnu_printf],
[pgac_cv_printf_archetype=printf])
ac_c_werror_flag=$ac_save_c_werror_flag])
AC_DEFINE_UNQUOTED([PG_PRINTF_ATTRIBUTE], [$pgac_cv_printf_archetype],
[Define to gnu_printf if compiler supports it, else printf.])
])# PGAC_PRINTF_ARCHETYPE
# PGAC_TYPE_64BIT_INT(TYPE)
# -------------------------