From 1c4c4be509ab548d9e848a8850c30e3dbbb7f8bc Mon Sep 17 00:00:00 2001
From: Ben Boeckel <ben.boeckel@kitware.com>
Date: Tue, 6 Nov 2018 13:20:36 -0500
Subject: FindJPEG: handle multiarch installs of libjpeg-turbo

Fedora installs a `jconfig-32.h` and `jconfig-64.h` which were not
searched. Instead, glob up all `jconfig` headers and bail once we've
found a version number.
---
 Modules/FindJPEG.cmake             | 42 +++++++++++++++++++++++---------------
 Tests/FindJPEG/Test/CMakeLists.txt |  2 ++
 Tests/FindJPEG/Test/main.c         |  2 +-
 3 files changed, 29 insertions(+), 17 deletions(-)

diff --git a/Modules/FindJPEG.cmake b/Modules/FindJPEG.cmake
index 0aa387a..f50f79e 100644
--- a/Modules/FindJPEG.cmake
+++ b/Modules/FindJPEG.cmake
@@ -67,23 +67,33 @@ endif()
 unset(jpeg_names)
 unset(jpeg_names_debug)
 
-if(JPEG_INCLUDE_DIR AND EXISTS "${JPEG_INCLUDE_DIR}/jpeglib.h")
-  file(STRINGS "${JPEG_INCLUDE_DIR}/jpeglib.h"
-    jpeg_lib_version REGEX "^#define[\t ]+JPEG_LIB_VERSION[\t ]+.*")
-
-  if (NOT jpeg_lib_version)
-    # libjpeg-turbo sticks JPEG_LIB_VERSION in jconfig.h
-    find_path(jconfig_dir jconfig.h)
-    if (jconfig_dir)
-      file(STRINGS "${jconfig_dir}/jconfig.h"
-        jpeg_lib_version REGEX "^#define[\t ]+JPEG_LIB_VERSION[\t ]+.*")
-    endif()
-    unset(jconfig_dir)
-  endif()
-
-  string(REGEX REPLACE "^#define[\t ]+JPEG_LIB_VERSION[\t ]+([0-9]+).*"
-    "\\1" JPEG_VERSION "${jpeg_lib_version}")
+if(JPEG_INCLUDE_DIR)
+  file(GLOB _JPEG_CONFIG_HEADERS_FEDORA "${JPEG_INCLUDE_DIR}/jconfig*.h")
+  file(GLOB _JPEG_CONFIG_HEADERS_DEBIAN "${JPEG_INCLUDE_DIR}/*/jconfig.h")
+  set(_JPEG_CONFIG_HEADERS
+    "${JPEG_INCLUDE_DIR}/jpeglib.h"
+    ${_JPEG_CONFIG_HEADERS_FEDORA}
+    ${_JPEG_CONFIG_HEADERS_DEBIAN})
+  foreach (_JPEG_CONFIG_HEADER IN LISTS _JPEG_CONFIG_HEADERS)
+    if (NOT EXISTS "${_JPEG_CONFIG_HEADER}")
+      continue ()
+    endif ()
+    file(STRINGS "${_JPEG_CONFIG_HEADER}"
+      jpeg_lib_version REGEX "^#define[\t ]+JPEG_LIB_VERSION[\t ]+.*")
+
+    if (NOT jpeg_lib_version)
+      continue ()
+    endif ()
+
+    string(REGEX REPLACE "^#define[\t ]+JPEG_LIB_VERSION[\t ]+([0-9]+).*"
+      "\\1" JPEG_VERSION "${jpeg_lib_version}")
+    break ()
+  endforeach ()
   unset(jpeg_lib_version)
+  unset(_JPEG_CONFIG_HEADER)
+  unset(_JPEG_CONFIG_HEADERS)
+  unset(_JPEG_CONFIG_HEADERS_FEDORA)
+  unset(_JPEG_CONFIG_HEADERS_DEBIAN)
 endif()
 
 include(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake)
diff --git a/Tests/FindJPEG/Test/CMakeLists.txt b/Tests/FindJPEG/Test/CMakeLists.txt
index a744f85..912c7a1 100644
--- a/Tests/FindJPEG/Test/CMakeLists.txt
+++ b/Tests/FindJPEG/Test/CMakeLists.txt
@@ -4,6 +4,8 @@ include(CTest)
 
 find_package(JPEG)
 
+add_definitions(-DCMAKE_EXPECTED_JPEG_VERSION=${JPEG_VERSION})
+
 add_executable(test_jpeg_tgt main.c)
 target_link_libraries(test_jpeg_tgt JPEG::JPEG)
 add_test(NAME test_jpeg_tgt COMMAND test_jpeg_tgt)
diff --git a/Tests/FindJPEG/Test/main.c b/Tests/FindJPEG/Test/main.c
index c6e48f0..0e23eff 100644
--- a/Tests/FindJPEG/Test/main.c
+++ b/Tests/FindJPEG/Test/main.c
@@ -12,5 +12,5 @@ int main()
   cinfo.err = jpeg_std_error(&jerr);
   jpeg_create_decompress(&cinfo);
 
-  return 0;
+  return (JPEG_LIB_VERSION != CMAKE_EXPECTED_JPEG_VERSION);
 }
-- 
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