From 12400475283f5081ea55f52a764e43f14032f6ba Mon Sep 17 00:00:00 2001
From: Jay Berkenbilt <ejb@ql.org>
Date: Sat, 22 Jun 2019 14:11:58 -0400
Subject: Try to use pkg-config to find external dependencies (fixes #324)

---
 configure | 322 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 317 insertions(+), 5 deletions(-)

(limited to 'configure')

diff --git a/configure b/configure
index 0cd1b0be..495bdc59 100755
--- a/configure
+++ b/configure
@@ -650,6 +650,13 @@ HAVE_LD_VERSION_SCRIPT
 QPDF_LARGE_FILE_TEST_PATH
 WINDOWS_WMAIN_LINK
 WINDOWS_WMAIN_COMPILE
+pc_libjpeg_LIBS
+pc_libjpeg_CFLAGS
+pc_zlib_LIBS
+pc_zlib_CFLAGS
+PKG_CONFIG_LIBDIR
+PKG_CONFIG_PATH
+PKG_CONFIG
 WINDOWS_WORDSIZE
 IS_32BIT
 RANDOM_DEVICE
@@ -791,7 +798,14 @@ CXXFLAGS
 CCC
 CPP
 LT_SYS_LIBRARY_PATH
-CXXCPP'
+CXXCPP
+PKG_CONFIG
+PKG_CONFIG_PATH
+PKG_CONFIG_LIBDIR
+pc_zlib_CFLAGS
+pc_zlib_LIBS
+pc_libjpeg_CFLAGS
+pc_libjpeg_LIBS'
 
 
 # Initialize some variables set by options.
@@ -1494,6 +1508,19 @@ Some influential environment variables:
   LT_SYS_LIBRARY_PATH
               User-defined run-time library search path.
   CXXCPP      C++ preprocessor
+  PKG_CONFIG  path to pkg-config utility
+  PKG_CONFIG_PATH
+              directories to add to pkg-config's search path
+  PKG_CONFIG_LIBDIR
+              path overriding pkg-config's built-in search path
+  pc_zlib_CFLAGS
+              C compiler flags for pc_zlib, overriding pkg-config
+  pc_zlib_LIBS
+              linker flags for pc_zlib, overriding pkg-config
+  pc_libjpeg_CFLAGS
+              C compiler flags for pc_libjpeg, overriding pkg-config
+  pc_libjpeg_LIBS
+              linker flags for pc_libjpeg, overriding pkg-config
 
 Use these variables to override the choices made by `configure' or to help
 it to find libraries and programs with nonstandard names/locations.
@@ -16118,8 +16145,279 @@ fi
 
 
 
+
+
+
+
+
+
+
+if test "x$ac_cv_env_PKG_CONFIG_set" != "xset"; then
+	if test -n "$ac_tool_prefix"; then
+  # Extract the first word of "${ac_tool_prefix}pkg-config", so it can be a program name with args.
+set dummy ${ac_tool_prefix}pkg-config; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_path_PKG_CONFIG+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  case $PKG_CONFIG in
+  [\\/]* | ?:[\\/]*)
+  ac_cv_path_PKG_CONFIG="$PKG_CONFIG" # Let the user override the test with a path.
+  ;;
+  *)
+  as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_path_PKG_CONFIG="$as_dir/$ac_word$ac_exec_ext"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+  ;;
+esac
+fi
+PKG_CONFIG=$ac_cv_path_PKG_CONFIG
+if test -n "$PKG_CONFIG"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $PKG_CONFIG" >&5
+$as_echo "$PKG_CONFIG" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+fi
+if test -z "$ac_cv_path_PKG_CONFIG"; then
+  ac_pt_PKG_CONFIG=$PKG_CONFIG
+  # Extract the first word of "pkg-config", so it can be a program name with args.
+set dummy pkg-config; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_path_ac_pt_PKG_CONFIG+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  case $ac_pt_PKG_CONFIG in
+  [\\/]* | ?:[\\/]*)
+  ac_cv_path_ac_pt_PKG_CONFIG="$ac_pt_PKG_CONFIG" # Let the user override the test with a path.
+  ;;
+  *)
+  as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_path_ac_pt_PKG_CONFIG="$as_dir/$ac_word$ac_exec_ext"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+  ;;
+esac
+fi
+ac_pt_PKG_CONFIG=$ac_cv_path_ac_pt_PKG_CONFIG
+if test -n "$ac_pt_PKG_CONFIG"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_pt_PKG_CONFIG" >&5
+$as_echo "$ac_pt_PKG_CONFIG" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+  if test "x$ac_pt_PKG_CONFIG" = x; then
+    PKG_CONFIG=""
+  else
+    case $cross_compiling:$ac_tool_warned in
+yes:)
+{ $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: using cross tools not prefixed with host triplet" >&5
+$as_echo "$as_me: WARNING: using cross tools not prefixed with host triplet" >&2;}
+ac_tool_warned=yes ;;
+esac
+    PKG_CONFIG=$ac_pt_PKG_CONFIG
+  fi
+else
+  PKG_CONFIG="$ac_cv_path_PKG_CONFIG"
+fi
+
+fi
+if test -n "$PKG_CONFIG"; then
+	_pkg_min_version=0.9.0
+	{ $as_echo "$as_me:${as_lineno-$LINENO}: checking pkg-config is at least version $_pkg_min_version" >&5
+$as_echo_n "checking pkg-config is at least version $_pkg_min_version... " >&6; }
+	if $PKG_CONFIG --atleast-pkgconfig-version $_pkg_min_version; then
+		{ $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }
+	else
+		{ $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+		PKG_CONFIG=""
+	fi
+fi
 if test "$BUILD_INTERNAL_LIBS" = "0"; then
-   ac_fn_c_check_header_mongrel "$LINENO" "zlib.h" "ac_cv_header_zlib_h" "$ac_includes_default"
+    if test "$PKG_CONFIG" != ""; then
+
+pkg_failed=no
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for pc_zlib" >&5
+$as_echo_n "checking for pc_zlib... " >&6; }
+
+if test -n "$pc_zlib_CFLAGS"; then
+    pkg_cv_pc_zlib_CFLAGS="$pc_zlib_CFLAGS"
+ elif test -n "$PKG_CONFIG"; then
+    if test -n "$PKG_CONFIG" && \
+    { { $as_echo "$as_me:${as_lineno-$LINENO}: \$PKG_CONFIG --exists --print-errors \"zlib\""; } >&5
+  ($PKG_CONFIG --exists --print-errors "zlib") 2>&5
+  ac_status=$?
+  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+  test $ac_status = 0; }; then
+  pkg_cv_pc_zlib_CFLAGS=`$PKG_CONFIG --cflags "zlib" 2>/dev/null`
+		      test "x$?" != "x0" && pkg_failed=yes
+else
+  pkg_failed=yes
+fi
+ else
+    pkg_failed=untried
+fi
+if test -n "$pc_zlib_LIBS"; then
+    pkg_cv_pc_zlib_LIBS="$pc_zlib_LIBS"
+ elif test -n "$PKG_CONFIG"; then
+    if test -n "$PKG_CONFIG" && \
+    { { $as_echo "$as_me:${as_lineno-$LINENO}: \$PKG_CONFIG --exists --print-errors \"zlib\""; } >&5
+  ($PKG_CONFIG --exists --print-errors "zlib") 2>&5
+  ac_status=$?
+  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+  test $ac_status = 0; }; then
+  pkg_cv_pc_zlib_LIBS=`$PKG_CONFIG --libs "zlib" 2>/dev/null`
+		      test "x$?" != "x0" && pkg_failed=yes
+else
+  pkg_failed=yes
+fi
+ else
+    pkg_failed=untried
+fi
+
+
+
+if test $pkg_failed = yes; then
+   	{ $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+
+if $PKG_CONFIG --atleast-pkgconfig-version 0.20; then
+        _pkg_short_errors_supported=yes
+else
+        _pkg_short_errors_supported=no
+fi
+        if test $_pkg_short_errors_supported = yes; then
+	        pc_zlib_PKG_ERRORS=`$PKG_CONFIG --short-errors --print-errors --cflags --libs "zlib" 2>&1`
+        else
+	        pc_zlib_PKG_ERRORS=`$PKG_CONFIG --print-errors --cflags --libs "zlib" 2>&1`
+        fi
+	# Put the nasty error message in config.log where it belongs
+	echo "$pc_zlib_PKG_ERRORS" >&5
+
+	:
+elif test $pkg_failed = untried; then
+     	{ $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+	:
+else
+	pc_zlib_CFLAGS=$pkg_cv_pc_zlib_CFLAGS
+	pc_zlib_LIBS=$pkg_cv_pc_zlib_LIBS
+        { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }
+	CFLAGS="$CFLAGS $pc_zlib_CFLAGS"
+          CXXFLAGS="$CXXFLAGS $pc_zlib_CXXFLAGS"
+          LIBS="$LIBS $pc_zlib_LIBS"
+
+fi
+
+pkg_failed=no
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for pc_libjpeg" >&5
+$as_echo_n "checking for pc_libjpeg... " >&6; }
+
+if test -n "$pc_libjpeg_CFLAGS"; then
+    pkg_cv_pc_libjpeg_CFLAGS="$pc_libjpeg_CFLAGS"
+ elif test -n "$PKG_CONFIG"; then
+    if test -n "$PKG_CONFIG" && \
+    { { $as_echo "$as_me:${as_lineno-$LINENO}: \$PKG_CONFIG --exists --print-errors \"libjpeg\""; } >&5
+  ($PKG_CONFIG --exists --print-errors "libjpeg") 2>&5
+  ac_status=$?
+  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+  test $ac_status = 0; }; then
+  pkg_cv_pc_libjpeg_CFLAGS=`$PKG_CONFIG --cflags "libjpeg" 2>/dev/null`
+		      test "x$?" != "x0" && pkg_failed=yes
+else
+  pkg_failed=yes
+fi
+ else
+    pkg_failed=untried
+fi
+if test -n "$pc_libjpeg_LIBS"; then
+    pkg_cv_pc_libjpeg_LIBS="$pc_libjpeg_LIBS"
+ elif test -n "$PKG_CONFIG"; then
+    if test -n "$PKG_CONFIG" && \
+    { { $as_echo "$as_me:${as_lineno-$LINENO}: \$PKG_CONFIG --exists --print-errors \"libjpeg\""; } >&5
+  ($PKG_CONFIG --exists --print-errors "libjpeg") 2>&5
+  ac_status=$?
+  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+  test $ac_status = 0; }; then
+  pkg_cv_pc_libjpeg_LIBS=`$PKG_CONFIG --libs "libjpeg" 2>/dev/null`
+		      test "x$?" != "x0" && pkg_failed=yes
+else
+  pkg_failed=yes
+fi
+ else
+    pkg_failed=untried
+fi
+
+
+
+if test $pkg_failed = yes; then
+   	{ $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+
+if $PKG_CONFIG --atleast-pkgconfig-version 0.20; then
+        _pkg_short_errors_supported=yes
+else
+        _pkg_short_errors_supported=no
+fi
+        if test $_pkg_short_errors_supported = yes; then
+	        pc_libjpeg_PKG_ERRORS=`$PKG_CONFIG --short-errors --print-errors --cflags --libs "libjpeg" 2>&1`
+        else
+	        pc_libjpeg_PKG_ERRORS=`$PKG_CONFIG --print-errors --cflags --libs "libjpeg" 2>&1`
+        fi
+	# Put the nasty error message in config.log where it belongs
+	echo "$pc_libjpeg_PKG_ERRORS" >&5
+
+	:
+elif test $pkg_failed = untried; then
+     	{ $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+	:
+else
+	pc_libjpeg_CFLAGS=$pkg_cv_pc_libjpeg_CFLAGS
+	pc_libjpeg_LIBS=$pkg_cv_pc_libjpeg_LIBS
+        { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }
+	CFLAGS="$CFLAGS $pc_libjpeg_CFLAGS"
+          CXXFLAGS="$CXXFLAGS $pc_libjpeg_CXXFLAGS"
+          LIBS="$LIBS $pc_libjpeg_LIBS"
+
+fi
+    fi
+    if test "$pc_zlib_LIBS" = ""; then
+        ac_fn_c_check_header_mongrel "$LINENO" "zlib.h" "ac_cv_header_zlib_h" "$ac_includes_default"
 if test "x$ac_cv_header_zlib_h" = xyes; then :
 
 else
@@ -16127,7 +16425,7 @@ else
 fi
 
 
-   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for library containing deflate" >&5
+        { $as_echo "$as_me:${as_lineno-$LINENO}: checking for library containing deflate" >&5
 $as_echo_n "checking for library containing deflate... " >&6; }
 if ${ac_cv_search_deflate+:} false; then :
   $as_echo_n "(cached) " >&6
@@ -16185,7 +16483,9 @@ else
   MISSING_ZLIB=1; MISSING_ANY=1
 fi
 
-   ac_fn_c_check_header_mongrel "$LINENO" "jpeglib.h" "ac_cv_header_jpeglib_h" "$ac_includes_default"
+    fi
+    if test "$pc_libjpeg_LIBS" = ""; then
+        ac_fn_c_check_header_mongrel "$LINENO" "jpeglib.h" "ac_cv_header_jpeglib_h" "$ac_includes_default"
 if test "x$ac_cv_header_jpeglib_h" = xyes; then :
 
 else
@@ -16193,7 +16493,7 @@ else
 fi
 
 
-   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for library containing jpeg_destroy" >&5
+        { $as_echo "$as_me:${as_lineno-$LINENO}: checking for library containing jpeg_destroy" >&5
 $as_echo_n "checking for library containing jpeg_destroy... " >&6; }
 if ${ac_cv_search_jpeg_destroy+:} false; then :
   $as_echo_n "(cached) " >&6
@@ -16251,6 +16551,18 @@ else
   MISSING_JPEG=1; MISSING_ANY=1
 fi
 
+    fi
+    if test "$LIBS" != ""; then
+        nLIBS=""
+        for x in $LIBS; do
+            if echo $x | grep -q '^-L'; then
+                LDFLAGS="$LDFLAGS $x"
+            else
+                nLIBS="$nLIBS $x"
+            fi
+            LIBS=$nLIBS
+        done
+    fi
 fi
 
 qpdf_USE_WMAIN=0
-- 
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