AX_CHECK_PCRE2([bits], [action-if-found], [action-if-not-found])
Search for an installed libpcre2-8 library. If nothing was specified when calling configure, it searches first in /usr/local and then in /usr, /opt/local and /sw. If the –with-pcre2=DIR is specified, it will try to find it in DIR/include/pcre2.h and DIR/lib/libpcre2-8. If –without-pcre2 is specified, the library is not searched at all.
If ’bits’ is empty or ’8’, PCRE2 8-bit character support is checked only. If ’bits’ contains ’16’, PCRE2 8-bit and 16-bit character support are checked. If ’bits’ contains ’32’, PCRE2 8-bit and 32-bit character support are checked. When ’bits’ contains both ’16’ and ’32’, PCRE2 8-bit, 16-bit, and 32-bit character support is checked.
If either the header file (pcre2.h), or the library (libpcre2-8) is not found, or the specified PCRE2 character bit width is not supported, shell commands ’action-if-not-found’ is run. If ’action-if-not-found’ is not specified, the configuration exits on error, asking for a valid PCRE2 installation directory or –without-pcre2.
If both header file and library are found, and the specified PCRE2 bit widths are supported, shell commands ’action-if-found’ is run. If ’action-if-found’ is not specified, the default action appends ’-I${PCRE2_HOME}/include’ to CPFLAGS, appends ’-L$PCRE2_HOME}/lib’ to LDFLAGS, prepends ’-lpcre2-8’ to LIBS, and calls AC_DEFINE(HAVE_PCRE2). You should use autoheader to include a definition for this symbol in a config.h file. Sample usage in a C/C++ source is as follows:
#ifdef HAVE_PCRE2 #define PCRE2_CODE_UNIT_WIDTH 8 #include <pcre2.h> #endif /* HAVE_PCRE2 */
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Copyright © 2020 Robert van Engelen engelen@acm.org
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