fix miscompilation with clang

diff --git a/cmake/platform.cmake b/cmake/platform.cmake
index 2cdc3a6e4b71ab25d4ad7e82c72cd42913fe3abf..5a2b85b27e52ae970ea5ec4d1712e5585b8bda0a 100644 (file)
--- a/cmake/platform.cmake
+++ b/cmake/platform.cmake
@@ -1,3 +1,8 @@
+# determine compiler
+if (CMAKE_CXX_COMPILER_ID MATCHES "Clang")
+  set(CMAKE_COMPILER_IS_CLANG TRUE)
+endif()
+
 # determine the target arch
 
 if (CROSS_COMPILE_AARCH64)
@@ -10,7 +15,7 @@ else()
   CHECK_C_SOURCE_COMPILES("#if !(defined(__i386__) || defined(_M_IX86))\n#error not 32bit\n#endif\nint main(void) { return 0; }" ARCH_IA32)
   CHECK_C_SOURCE_COMPILES("#if !defined(__ARM_ARCH_ISA_A64)\n#error not 64bit\n#endif\nint main(void) { return 0; }" ARCH_AARCH64)
   CHECK_C_SOURCE_COMPILES("#if !defined(__ARM_ARCH_ISA_ARM)\n#error not 32bit\n#endif\nint main(void) { return 0; }" ARCH_ARM32)
-  CHECK_C_SOURCE_COMPILES("#if !defined(__PPC64__) && !defined(__LITTLE_ENDIAN__) && !defined(__VSX__)\n#error not ppc64el\n#endif\nint main(void) { return 0; }" ARCH_PPC64EL)
+  CHECK_C_SOURCE_COMPILES("#if !defined(__PPC64__) && !(defined(__LITTLE_ENDIAN__) && defined(__VSX__))\n#error not ppc64el\n#endif\nint main(void) { return 0; }" ARCH_PPC64EL)
   if (ARCH_X86_64 OR ARCH_AARCH64 OR ARCH_PPC64EL)
     set(ARCH_64_BIT TRUE)
   else()