Generate libaom_srcs.txt and libaom_srcs.gni via CMake.

BUG=aomedia:474

Change-Id: I42569ab97b5246de98310031e1d2398876283527

CMakeLists.txt

@@ -641,3 +641,80 @@ add_custom_target(dist
 if (ENABLE_DOCS)
   add_dependencies(dist docs)
 endif ()
+
+# Collect all variables containing libaom source files.
+get_cmake_property(all_cmake_vars VARIABLES)
+foreach (var ${all_cmake_vars})
+  if ("${var}" MATCHES "SOURCES$\|_INTRIN_\|_ASM_" AND NOT
+      "${var}" MATCHES "_APP_\|DOXYGEN\|LIBWEBM\|LIBYUV\|_PKG_\|TEST")
+    list(APPEND aom_source_vars ${var})
+  endif ()
+endforeach ()
+
+# Libaom_srcs.txt generation.
+set(libaom_srcs_txt_file "${AOM_CONFIG_DIR}/libaom_srcs.txt")
+file(WRITE "${libaom_srcs_txt_file}" "# This file is generated. DO NOT EDIT.\n")
+
+# Static source file list first.
+foreach (aom_source_var ${aom_source_vars})
+  foreach (file ${${aom_source_var}})
+    if (NOT "${file}" MATCHES "${AOM_CONFIG_DIR}")
+      string(REPLACE "${AOM_ROOT}/" "" file "${file}")
+      file(APPEND "${libaom_srcs_txt_file}" "${file}\n")
+    endif ()
+  endforeach ()
+endforeach ()
+
+file(APPEND "${libaom_srcs_txt_file}"
+     "# Files below this line are generated by the libaom build system.\n")
+foreach (aom_source_var ${aom_source_vars})
+  foreach (file ${${aom_source_var}})
+    if ("${file}" MATCHES "${AOM_CONFIG_DIR}")
+      string(REPLACE "${AOM_CONFIG_DIR}/" "" file "${file}")
+      file(APPEND "${libaom_srcs_txt_file}" "${file}\n")
+    endif ()
+  endforeach ()
+endforeach ()
+
+# Libaom_srcs.gni generation.
+set(libaom_srcs_gni_file "${AOM_CONFIG_DIR}/libaom_srcs.gni")
+file(WRITE "${libaom_srcs_gni_file}" "# This file is generated. DO NOT EDIT.\n")
+
+foreach (aom_source_var ${aom_source_vars})
+  if ("${${aom_source_var}}" MATCHES "${AOM_ROOT}")
+    string(TOLOWER ${aom_source_var} aom_source_var_lowercase)
+    file(APPEND "${libaom_srcs_gni_file}" "\n${aom_source_var_lowercase} = [\n")
+  endif ()
+
+  foreach (file ${${aom_source_var}})
+    if (NOT "${file}" MATCHES "${AOM_CONFIG_DIR}")
+      string(REPLACE "${AOM_ROOT}" "//third_party/aom/src" file "${file}")
+      file(APPEND "${libaom_srcs_gni_file}" "  \"${file}\",\n")
+    endif ()
+  endforeach ()
+
+  if ("${${aom_source_var}}" MATCHES "${AOM_ROOT}")
+    file(APPEND "${libaom_srcs_gni_file}" "]\n")
+  endif ()
+endforeach ()
+
+file(APPEND "${libaom_srcs_gni_file}"
+     "\n# Files below this line are generated by the libaom build system.\n")
+
+foreach (aom_source_var ${aom_source_vars})
+  if ("${${aom_source_var}}" MATCHES "${AOM_CONFIG_DIR}")
+    string(TOLOWER ${aom_source_var} aom_source_var_lowercase)
+    file(APPEND "${libaom_srcs_gni_file}"
+         "\n${aom_source_var_lowercase}_gen = [\n")
+  endif ()
+  foreach (file ${${aom_source_var}})
+    if (NOT "${file}" MATCHES "${AOM_ROOT}")
+      string(REPLACE "${AOM_CONFIG_DIR}" "//third_party/aom/src" file "${file}")
+      file(APPEND "${libaom_srcs_gni_file}" "  \"${file}\",\n")
+    endif ()
+  endforeach ()
+
+  if ("${${aom_source_var}}" MATCHES "${AOM_CONFIG_DIR}")
+    file(APPEND "${libaom_srcs_gni_file}" "]\n")
+  endif ()
+endforeach ()