From 8bda42cc12a11e7348abadc8288f0372191918cc Mon Sep 17 00:00:00 2001
From: "github-actions[bot]"
 <41898282+github-actions[bot]@users.noreply.github.com>
Date: Sun, 5 Dec 2021 13:55:33 +1300
Subject: Merge pull request #2970 from mwtoews/static-extra-libs (#2971)

Refactor proj.pc to use EXTRA_LIBS; add -lpthread to Libs.private

Co-authored-by: Even Rouault <even.rouault@spatialys.com>
---
 cmake/ProjUtilities.cmake | 18 +++++++++++-------
 configure.ac              | 11 ++++++++++-
 proj.pc.in                |  2 +-
 3 files changed, 22 insertions(+), 9 deletions(-)

diff --git a/cmake/ProjUtilities.cmake b/cmake/ProjUtilities.cmake
index 55d53cbb..333b01f0 100644
--- a/cmake/ProjUtilities.cmake
+++ b/cmake/ProjUtilities.cmake
@@ -76,21 +76,25 @@ function(configure_proj_pc)
   set(datadir "$\{datarootdir\}")
   set(PACKAGE "proj")
   set(VERSION ${PROJ_VERSION})
-  set(SQLITE3_LIBS -lsqlite3)
+  # Build list for Libs.private
+  set(EXTRA_LIBS
+    -lstdc++
+    -lsqlite3
+    ${CMAKE_THREAD_LIBS_INIT}
+  )
   if(TIFF_ENABLED)
-    set(TIFF_LIBS -ltiff)
+    list(APPEND EXTRA_LIBS -ltiff)
   endif()
   if(CURL_ENABLED)
-    set(CURL_LIBS -lcurl)
+    list(APPEND EXTRA_LIBS -lcurl)
   endif()
-  set(EXTRA_LIBS "-lstdc++")
   if(HAVE_LIBM)
-    list(APPEND EXTRA_LIBS "-lm")
+    list(APPEND EXTRA_LIBS -lm)
   endif()
   if(HAVE_LIBDL)
-    list(APPEND EXTRA_LIBS "-ldl")
+    list(APPEND EXTRA_LIBS -ldl)
   endif()
-  # Join list with a space
+  # Join list with a space; list(JOIN) added CMake 3.12
   string(REPLACE ";" " " _tmp_str "${EXTRA_LIBS}")
   set(EXTRA_LIBS "${_tmp_str}")
 
diff --git a/configure.ac b/configure.ac
index d3b1aa2d..f303cd77 100644
--- a/configure.ac
+++ b/configure.ac
@@ -325,7 +325,16 @@ dnl ---------------------------------------------------------------------------
 dnl Check for extra libraries, required for static linking with pkg-config
 dnl ---------------------------------------------------------------------------
 
-EXTRA_LIBS="-lstdc++"
+EXTRA_LIBS="-lstdc++ -lsqlite3"
+if test "no$THREAD_LIB" != "no"; then
+  EXTRA_LIBS="$EXTRA_LIBS $THREAD_LIB"
+fi
+if test "x$enable_tiff" != "xno" -o "x$enable_tiff" = ""; then
+  EXTRA_LIBS="$EXTRA_LIBS -ltiff"
+fi
+if test "$FOUND_CURL" = "yes" ; then
+  EXTRA_LIBS="$EXTRA_LIBS -lcurl"
+fi
 if test "$HAVE_LIBM" != "no" ; then
   EXTRA_LIBS="$EXTRA_LIBS -lm"
 fi
diff --git a/proj.pc.in b/proj.pc.in
index d63a3d9d..54c5bfcc 100644
--- a/proj.pc.in
+++ b/proj.pc.in
@@ -10,5 +10,5 @@ Description: Coordinate transformation software library
 Requires:
 Version: @VERSION@
 Libs: -L${libdir} -lproj
-Libs.private: @SQLITE3_LIBS@ @TIFF_LIBS@ @CURL_LIBS@ @EXTRA_LIBS@
+Libs.private: @EXTRA_LIBS@
 Cflags: -I${includedir}
-- 
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