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configure: ignore the REG_ENHANCED test when we use gnulib 

If we're using the bundled gnulib regex module, then assume REG_ENHANCED
is not supported (since gnulib doesn't support it).

This fixes https://savannah.gnu.org/bugs/?50714.
This commit is contained in:
Mike Frysinger 2017-04-04 12:42:23 -04:00 committed by Benno Schulenberg
parent c84324bc7a
commit cc91ee603c
1 changed files with 14 additions and 5 deletions
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19
configure.ac
View File

@ -587,17 +587,26 @@ else
fi
fi
AC_CACHE_CHECK([for enhanced regular expression flag], nano_cv_flag_reg_extended,
AC_CACHE_CHECK([for enhanced regular expression flag], nano_cv_flag_reg_enhanced,
[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <regex.h>]],
[[
#ifndef REG_ENHANCED
error: No REG_ENHANCED support!
#endif
]])],
[nano_cv_flag_reg_extended="REG_EXTENDED | REG_ENHANCED"],
[nano_cv_flag_reg_extended="REG_EXTENDED"])])
[nano_cv_flag_reg_enhanced=yes],
[nano_cv_flag_reg_enhanced=no])])
dnl The bundled gnulib regex module doesn't support REG_ENHANCED.
if test "$ac_use_included_regex" = "yes"; then
nano_cv_flag_reg_enhanced="no"
fi
if test "$nano_cv_flag_reg_enhanced" = "yes"; then
nano_reg_extended="REG_EXTENDED | REG_ENHANCED"
else
nano_reg_extended="REG_EXTENDED"
fi
AC_DEFINE_UNQUOTED(NANO_REG_EXTENDED, $nano_cv_flag_reg_extended,
AC_DEFINE_UNQUOTED(NANO_REG_EXTENDED, $nano_reg_extended,
[Flag(s) to use to get the full range of extended regular expressions])
# Check for word-boundary support (/< and />).
@ -625,7 +634,7 @@ int main(void)
size_t nmatch;
regmatch_t pmatch;
if (regcomp(&r, "\\\\>", $nano_cv_flag_reg_extended|REG_NOSUB))
if (regcomp(&r, "\\\\>", $nano_reg_extended|REG_NOSUB))
return 1;
if (regexec(&r, "word boundary", nmatch, &pmatch, 0))
return 1;