Pass -Wno-error to linker in case of LTO builds

When linking a release-built command line shell on Linux against
default glibc with LTO enabled, a long-open gcc bug causes spurious
warning to be emitted around a call to fread. The -Werror flag
turns this into an error and the build process fails.
Unfortunately, there is no way to selectively disable the warning
with pragmas or -Wno-error=xxx flags.

Thus, this patch passes -Wno-error to the linker in case of LTO
builds. (But only to the linker. The compilation still applies the
warnings-are-errors policy.)

JerryScript-DCO-1.0-Signed-off-by: Akos Kiss akiss@inf.u-szeged.hu

Author: akosthekiss

CMakeLists.txt

@@ -230,7 +230,7 @@ project (Jerry CXX C ASM)
    if(NOT ("${PLATFORM}" STREQUAL "DARWIN"))
     set(COMPILE_FLAGS_JERRY "${COMPILE_FLAGS_JERRY} -fno-fat-lto-objects")
    endif()
-   set(LINKER_FLAGS_COMMON "${LINKER_FLAGS_COMMON} -flto")
+   set(LINKER_FLAGS_COMMON "${LINKER_FLAGS_COMMON} -flto -Wno-error")
   endif()
 
  # Turn off stack protector