diff options
Diffstat (limited to 'config/c-compiler.m4')
| -rw-r--r-- | config/c-compiler.m4 | 35 |
1 files changed, 25 insertions, 10 deletions
diff --git a/config/c-compiler.m4 b/config/c-compiler.m4 index fb58c94d4b0..af2dea1c2ab 100644 --- a/config/c-compiler.m4 +++ b/config/c-compiler.m4 @@ -21,21 +21,36 @@ fi])# PGAC_C_SIGNED # ----------------------- # Select the format archetype to be used by gcc to check printf-type functions. # We prefer "gnu_printf", as that most closely matches the features supported -# by src/port/snprintf.c (particularly the %m conversion spec). +# by src/port/snprintf.c (particularly the %m conversion spec). However, +# on some NetBSD versions, that doesn't work while "__syslog__" does. +# If all else fails, use "printf". AC_DEFUN([PGAC_PRINTF_ARCHETYPE], [AC_CACHE_CHECK([for printf format archetype], pgac_cv_printf_archetype, +[pgac_cv_printf_archetype=gnu_printf +PGAC_TEST_PRINTF_ARCHETYPE +if [[ "$ac_archetype_ok" = no ]]; then + pgac_cv_printf_archetype=__syslog__ + PGAC_TEST_PRINTF_ARCHETYPE + if [[ "$ac_archetype_ok" = no ]]; then + pgac_cv_printf_archetype=printf + fi +fi]) +AC_DEFINE_UNQUOTED([PG_PRINTF_ATTRIBUTE], [$pgac_cv_printf_archetype], +[Define to best printf format archetype, usually gnu_printf if available.]) +])# PGAC_PRINTF_ARCHETYPE + +# Subroutine: test $pgac_cv_printf_archetype, set $ac_archetype_ok to yes or no +AC_DEFUN([PGAC_TEST_PRINTF_ARCHETYPE], [ac_save_c_werror_flag=$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 +[extern void pgac_write(int ignore, const char *fmt,...) +__attribute__((format($pgac_cv_printf_archetype, 2, 3)));], +[pgac_write(0, "error %s: %m", "foo");])], + [ac_archetype_ok=yes], + [ac_archetype_ok=no]) +ac_c_werror_flag=$ac_save_c_werror_flag +])# PGAC_TEST_PRINTF_ARCHETYPE # PGAC_TYPE_64BIT_INT(TYPE) |