During configure, do not check for pcre if pcre2 specified

CHANGES

@@ -1,6 +1,8 @@
 v3.x.y - YYYY-MMM-DD (to be released)
 -------------------------------------
 
+  - During configure, do not check for pcre if pcre2 specified
+    [Issue #2750 - @dvershinin, @martinhsv]
   - Use pkg-config to find libxml2 first
     [Issue #2714 - @hughmcmaster]
   - Fix two rule-reload memory leak issues

build/pcre.m4

@@ -21,88 +21,93 @@ AC_ARG_WITH(
     [test_paths="${with_pcre}"],
     [test_paths="/usr/local/libpcre /usr/local/pcre /usr/local /opt/libpcre /opt/pcre /opt /usr /opt/local"])
 
-AC_MSG_CHECKING([for libpcre config script])
+if test "x${with_pcre2}" != "x" && test "x${with_pcre2}" != "xno"; then
+    AC_MSG_NOTICE([pcre2 specified; omitting check for pcre])
+else
 
-for x in ${test_paths}; do
-    dnl # Determine if the script was specified and use it directly
-    if test ! -d "$x" -a -e "$x"; then
-        PCRE_CONFIG=$x
-        pcre_path="no"
-        break
-    fi
+    AC_MSG_CHECKING([for libpcre config script])
 
-    dnl # Try known config script names/locations
-    for PCRE_CONFIG in pcre-config; do
-        if test -e "${x}/bin/${PCRE_CONFIG}"; then
-            pcre_path="${x}/bin"
+    for x in ${test_paths}; do
+        dnl # Determine if the script was specified and use it directly
+        if test ! -d "$x" -a -e "$x"; then
+            PCRE_CONFIG=$x
+            pcre_path="no"
             break
-        elif test -e "${x}/${PCRE_CONFIG}"; then
-            pcre_path="${x}"
+        fi
+
+        dnl # Try known config script names/locations
+        for PCRE_CONFIG in pcre-config; do
+            if test -e "${x}/bin/${PCRE_CONFIG}"; then
+                pcre_path="${x}/bin"
+                break
+            elif test -e "${x}/${PCRE_CONFIG}"; then
+                pcre_path="${x}"
+                break
+            else
+                pcre_path=""
+            fi
+        done
+        if test -n "$pcre_path"; then
             break
-        else
-            pcre_path=""
         fi
     done
-    if test -n "$pcre_path"; then
-        break
-    fi
-done
 
-if test -n "${pcre_path}"; then
-    if test "${pcre_path}" != "no"; then
-        PCRE_CONFIG="${pcre_path}/${PCRE_CONFIG}"
+    if test -n "${pcre_path}"; then
+        if test "${pcre_path}" != "no"; then
+            PCRE_CONFIG="${pcre_path}/${PCRE_CONFIG}"
+        fi
+        AC_MSG_RESULT([${PCRE_CONFIG}])
+        PCRE_VERSION="`${PCRE_CONFIG} --version`"
+        if test ! -z "${PCRE_VERSION}"; then AC_MSG_NOTICE(pcre VERSION: $PCRE_VERSION); fi
+        PCRE_CFLAGS="`${PCRE_CONFIG} --cflags`"
+        if test ! -z "${PCRE_CFLAGS}"; then AC_MSG_NOTICE(pcre CFLAGS: $PCRE_CFLAGS); fi
+        PCRE_LDADD="`${PCRE_CONFIG} --libs`"
+        if test ! -z "${PCRE_LDADD}"; then AC_MSG_NOTICE(pcre LDADD: $PCRE_LDADD); fi
+        PCRE_LD_PATH="/`${PCRE_CONFIG} --libs | cut -d'/' -f2,3,4,5,6 | cut -d ' ' -f1`"
+        if test ! -z "${PCRE_LD_PATH}"; then AC_MSG_NOTICE(pcre PCRE_LD_PATH: $PCRE_LD_PATH); fi
+    else
+        AC_MSG_RESULT([no])
     fi
-    AC_MSG_RESULT([${PCRE_CONFIG}])
-    PCRE_VERSION="`${PCRE_CONFIG} --version`"
-    if test ! -z "${PCRE_VERSION}"; then AC_MSG_NOTICE(pcre VERSION: $PCRE_VERSION); fi
-    PCRE_CFLAGS="`${PCRE_CONFIG} --cflags`"
-    if test ! -z "${PCRE_CFLAGS}"; then AC_MSG_NOTICE(pcre CFLAGS: $PCRE_CFLAGS); fi
-    PCRE_LDADD="`${PCRE_CONFIG} --libs`"
-    if test ! -z "${PCRE_LDADD}"; then AC_MSG_NOTICE(pcre LDADD: $PCRE_LDADD); fi
-    PCRE_LD_PATH="/`${PCRE_CONFIG} --libs | cut -d'/' -f2,3,4,5,6 | cut -d ' ' -f1`"
-    if test ! -z "${PCRE_LD_PATH}"; then AC_MSG_NOTICE(pcre PCRE_LD_PATH: $PCRE_LD_PATH); fi
-else
-    AC_MSG_RESULT([no])
-fi
 
-if test -n "${PCRE_VERSION}"; then
-    AC_MSG_CHECKING(for PCRE JIT)
-    save_CFLAGS=$CFLAGS
-    save_LDFLAGS=$LDFLAGS
-    save_LIBS=$LIBS
-    CFLAGS="${PCRE_CFLAGS} ${CFLAGS}"
-    LDFLAGS="${PCRE_LDADD} ${LDFLAGS}"
-    LIBS="${PCRE_LDADD} ${LIBS}"
-    AC_TRY_LINK([ #include <pcre.h> ],
-        [ pcre_jit_exec(NULL, NULL, NULL, 0, 0, 0, NULL, 0, NULL); ],
-        [ pcre_jit_available=yes ], [:]
-    )
+    if test -n "${PCRE_VERSION}"; then
+        AC_MSG_CHECKING(for PCRE JIT)
+        save_CFLAGS=$CFLAGS
+        save_LDFLAGS=$LDFLAGS
+        save_LIBS=$LIBS
+        CFLAGS="${PCRE_CFLAGS} ${CFLAGS}"
+        LDFLAGS="${PCRE_LDADD} ${LDFLAGS}"
+        LIBS="${PCRE_LDADD} ${LIBS}"
+        AC_TRY_LINK([ #include <pcre.h> ],
+            [ pcre_jit_exec(NULL, NULL, NULL, 0, 0, 0, NULL, 0, NULL); ],
+            [ pcre_jit_available=yes ], [:]
+        )
 
-    if test "x$pcre_jit_available" = "xyes"; then
-        AC_MSG_RESULT(yes)
-        PCRE_CFLAGS="${PCRE_CFLAGS} -DPCRE_HAVE_JIT"
-    else
-        AC_MSG_RESULT(no)
+        if test "x$pcre_jit_available" = "xyes"; then
+            AC_MSG_RESULT(yes)
+            PCRE_CFLAGS="${PCRE_CFLAGS} -DPCRE_HAVE_JIT"
+        else
+            AC_MSG_RESULT(no)
+        fi
+        CFLAGS=$save_CFLAGS
+        LDFLAGS=$save_LDFLAGS
+        LIBS=$save_LIBS
     fi
-    CFLAGS=$save_CFLAGS
-    LDFLAGS=$save_LDFLAGS
-    LIBS=$save_LIBS
-fi
 
-AC_SUBST(PCRE_CONFIG)
-AC_SUBST(PCRE_VERSION)
-AC_SUBST(PCRE_CPPFLAGS)
-AC_SUBST(PCRE_CFLAGS)
-AC_SUBST(PCRE_LDFLAGS)
-AC_SUBST(PCRE_LDADD)
-AC_SUBST(PCRE_LD_PATH)
+    AC_SUBST(PCRE_CONFIG)
+    AC_SUBST(PCRE_VERSION)
+    AC_SUBST(PCRE_CPPFLAGS)
+    AC_SUBST(PCRE_CFLAGS)
+    AC_SUBST(PCRE_LDFLAGS)
+    AC_SUBST(PCRE_LDADD)
+    AC_SUBST(PCRE_LD_PATH)
 
-if test -z "${PCRE_VERSION}"; then
-    AC_MSG_NOTICE([*** pcre library not found.])
-    ifelse([$2], , AC_MSG_ERROR([pcre library is required]), $2)
-else
-    AC_MSG_NOTICE([using pcre v${PCRE_VERSION}])
-    ifelse([$1], , , $1) 
-    PCRE_LDADD="${PCRE_LDADD} -lpcre"
-fi 
+    if test -z "${PCRE_VERSION}"; then
+        AC_MSG_NOTICE([*** pcre library not found.])
+        ifelse([$2], , AC_MSG_ERROR([pcre library is required]), $2)
+    else
+        AC_MSG_NOTICE([using pcre v${PCRE_VERSION}])
+        ifelse([$1], , , $1) 
+        PCRE_LDADD="${PCRE_LDADD} -lpcre"
+    fi 
+fi
 ])