Add warning about unknown executable format

diff --git a/libbacktrace/CMakeLists.txt b/libbacktrace/CMakeLists.txt
index 21fc9f3..ad7b2a0 100644 (file)
--- a/libbacktrace/CMakeLists.txt
+++ b/libbacktrace/CMakeLists.txt
@@ -110,6 +110,7 @@ if (CMAKE_EXECUTABLE_FORMAT STREQUAL "ELF")
     set (FORMAT_FILE elf.c dwarf.c)
     math (EXPR BACKTRACE_ELF_SIZE 8*${CMAKE_C_SIZEOF_DATA_PTR})
 else ()
+    message("WARNING: Unknown executable format \"${CMAKE_EXECUTABLE_FORMAT}\", setting BACKTRACE_SUPPORTED=0")
     set (FORMAT_FILE unknown.c)
     set (BACKTRACE_SUPPORTED 0)
 endif ()