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cgcccygwinuwsgi

unrecognized command line option ‘-rdynamic’ on GCC v4.9.2

I'm using GCC v4.9.2 under Cygwin on Windows 7 64-bit, but running into an issue trying to compile uWSGI.

The error I'm receiving is -

gcc: error: unrecognized command line option ‘-rdynamic’

GCC version output -

$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-pc-cygwin/4.9.2/lto-wrapper.exe
Target: x86_64-pc-cygwin
Configured with: /cygdrive/i/szsz/tmpp/gcc/gcc-4.9.2-3.x86_64/src/gcc-4.9.2/configure --srcdir=/cygdrive/i/szsz/tmpp/gcc/gcc-4.9.2-3.x86_64/src/gcc-4.9.2 --prefix=/usr --exec-prefix=/usr --bindir=/usr/bin --sbindir=/usr/sbin --libexecdir=/usr/libexec --datadir=/usr/share --localstatedir=/var --sysconfdir=/etc --libdir=/usr/lib --datarootdir=/usr/share --docdir=/usr/share/doc/gcc --htmldir=/usr/share/doc/gcc/html -C --build=x86_64-pc-cygwin --host=x86_64-pc-cygwin --target=x86_64-pc-cygwin --without-libiconv-prefix --without-libintl-prefix --libexecdir=/usr/lib --enable-shared --enable-shared-libgcc --enable-static --enable-version-specific-runtime-libs --enable-bootstrap --enable-__cxa_atexit --with-dwarf2 --with-tune=generic --enable-languages=ada,c,c++,fortran,lto,objc,obj-c++ --enable-graphite --enable-threads=posix --enable-libatomic --enable-libgomp --disable-libitm --enable-libquadmath --enable-libquadmath-support --enable-libssp --enable-libada --enable-libgcj-sublibs --disable-java-awt --disable-symvers --with-ecj-jar=/usr/share/java/ecj.jar --with-gnu-ld --with-gnu-as --with-cloog-include=/usr/include/cloog-isl --without-libiconv-prefix --without-libintl-prefix --with-system-zlib --enable-linker-build-id
Thread model: posix
gcc version 4.9.2 (GCC)

I'm invoking the build with CFLAGS="-Wno-error" make.

I'm not sure why I'm getting this error as I can see in the documentation from here that flag -rdynamic exists.

What am I missing?

Solution

  • I think I've got it...

    Here's what happens on my laptop (Cygwin 2.831 (pc032) on Win7 (pc064)):

    gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/i686-pc-cygwin/4.8.2/lto-wrapper.exe
Target: i686-pc-cygwin
Configured with: /cygdrive/i/szsz/tmpp/cygwin64/gcc/gcc-4.8.2-1/src/gcc-4.8.2/configure --srcdir=/cygdrive/i/szsz/tmpp/cygwin64/gcc/gcc-4.8.2-1/src/gcc-4.8.2 --prefix=/usr --exec-prefix=/usr --bindir=/usr/bin --sbindir=/usr/sbin --libexecdir=/usr/libexec --datadir=/usr/share --localstatedir=/var --sysconfdir=/etc --libdir=/usr/lib --datarootdir=/usr/share --docdir=/usr/share/doc/gcc -C --build=i686-pc-cygwin --host=i686-pc-cygwin --target=i686-pc-cygwin --without-libiconv-prefix --without-libintl-prefix --enable-shared --enable-shared-libgcc --enable-static --enable-version-specific-runtime-libs --enable-bootstrap --disable-__cxa_atexit --with-dwarf2 --with-arch=i686 --with-tune=generic --disable-sjlj-exceptions --enable-languages=ada,c,c++,fortran,java,lto,objc,obj-c++ --enable-graphite --enable-threads=posix --enable-libatomic --enable-libgomp --disable-libitm --enable-libquadmath --enable-libquadmath-support --enable-libssp --enable-libada --enable-libjava --enable-libgcj-sublibs --disable-java-awt --disable-symvers --with-ecj-jar=/usr/share/java/ecj.jar --with-gnu-ld --with-gnu-as --with-cloog-include=/usr/include/cloog-isl --without-libiconv-prefix --without-libintl-prefix --with-system-zlib
Thread model: posix
gcc version 4.8.2 (GCC)

    When I pass -rdynamic:

    gcc -rdynamic
gcc: fatal error: no input files
compilation terminated.

    Compared to -rdynamic1:

    gcc -rdynamic1
gcc: error: unrecognized command line option ‘-rdynamic1’
gcc: fatal error: no input files
compilation terminated.

    [Man7]: GCC(1) mentions it (I'm not sure how relevant is that), but gcc -v --help doesn't display it under the linker specific options. I thought that maybe something is different about how the GCCs are configured, but I didn't see any difference that would matter (both have --with-gnu-ld - which seems related - specified).

    Then I downloaded v4.8.2 and v4.9.2 sources and start searching and comparing, but again I couldn't find anything (it's true, the search could be widely extended).

    But while browsing the configure file, I noticed something that could be related, then I checked the ld command line options and I think I have an alternative:

    Instead of -rdynamic, you could pass -Wl,--export-all-symbols. That works for me (that's not very relevant since -rdynamic also works for me, unlike in your case :) ).