Install Therubyracer Failure
I try to install therubyracer via gem on Windows 10, but keep getting an error associated with -rdynamic flag, which results in failure to build the native extensions:
You can find -rdynamic flag in extconf.rb and Makefile:
C:\Ruby23-x64\lib\ruby\gems\2.3.0\gems\therubyracer-0.12.2\ext\v8\extconf.rb
$CPPFLAGS += " -rdynamic" unless $CPPFLAGS.split.include? "-rdynamic"
$CPPFLAGS += " -fPIC" unless $CPPFLAGS.split.include? "-rdynamic" or RUBY_PLATFORM =~ /darwin/
C:\Ruby23-x64\lib\ruby\gems\2.3.0\gems\therubyracer-0.12.2\ext\v8\Makefile
CPPFLAGS = -DFD_SETSIZE=2048 -D_WIN32_WINNT=0x0501 -D__MINGW_USE_VC2005_COMPAT $(DEFS) $(cppflags) -Wall -g -rdynamic
Somebody figures it out by changing gcc compiler to version 4.2 (mine is 4.9.3). For some reason the newer gcc version don’t just ignore the -rdynamic flag, which is only present for compiling on Linux and is not actually compatible with Windows and OS X.
More detailed explanation is that: -rdynamic passes the flag -export-dynamic to ELF linker, on targets that support it
Executable formats in OS X and Windows are not ELF, thus the option -rdynamic is not supported building for these operating systems.
http://stackoverflow.com/questions/29534519/why-gcc-doesnt-recognize-rdynamic-option
One solution is using an older gcc compiler, like gcc-4.2.
http://preshing.com/20141108/how-to-install-the-latest-gcc-on-windows/
wget http://ftpmirror.gnu.org/gcc/gcc-4.2.4/gcc-4.2.4.tar.gz
wget http://ftpmirror.gnu.org/gcc/gcc-4.2.4/gcc-g++-4.2.4.tar.bz2
