crtbegin_so.o missing for android toolchain (custom build)

gcc android-ndk gdc
dwerner picture dwerner · Jul 30, 2011 · Viewed 17.6k times · Source

I have compiled gdc together with gcc using the android build-gcc.sh script, and have included a new stub in build/core/definitions.mk to deal with D language files as a part of the build process. I know things are compiling OK at this point, but my problem is linking:

When I build a project, I get this error:

ld: crtbegin_so.o: No such file: No such file or directory

This is true for regular c-only projects as well. Now I ran a quick find in my build directory, and found that the file (crtbegin_so.o) does exist within the sysroot I specified when I compiled gcc (or rather, when build-gcc.sh built it).

  • What are some things I could look for to find a solution to this problem?

  • Would copying the files locally and linking directly to them be a decent solution in the interim?

  • Why would ld (or collect2) be trying to include these for a gdc (D Language) linkage?

Answer

Samveen picture Samveen · Apr 24, 2012

The issue arises on NDK r7c for linux as well.

I found that the toolchain ignores the platform location ($NDK_ROOT/platforms/android-8/arch-arm/usr/lib/) and searches for it in the toolchain path, which is incorrect.

However, as the toolchain also searches for the file in the current directory, one solution is to symlink the correct platform crtbegin_so.o and crtend_so.o into the source directory:

cd src && ln -s NDK_ROOT/platforms/android-8/arch-arm/usr/lib/crtbegin_so.a

cd src && ln -s NDK_ROOT/platforms/android-8/arch-arm/usr/lib/crtend_so.a

Thus your second point should work out (where you can do a symlink, instead of a copy)

NOTE 1:This assumes that the code is being compiled for API8 (Android 2.2) using the NDK. Please alter the path to the correct path as per your requirement.

NOTE 2:Configure flags used:

./configure \
--host=arm-linux-androideabi \
CC=arm-linux-androideabi-gcc \
CPPFLAGS="-I$NDK_ROOT/platforms/android-8/arch-arm/usr/include/" \
CFLAGS="-nostdlib" \
LDFLAGS="-Wl,-rpath-link=$NDK_ROOT/platforms/android-8/arch-arm/usr/lib/ -L$NDK_ROOT/platforms/android-8/arch-arm/usr/lib/" \
LIBS="-lc"

Related questions

Want to compile native Android binary I can run in terminal on the phone

I've been trying for a couple days to compile a native ARM Android binary that will execute on my phone using a terminal application. I want to generate the same type of binary as the standard Posix binaries installed on …

Read More
Which compiler does Android NDK use?

I'm writing ARM NEON-based code for an Android application and I was struggling with certain compiler flags not being recognized. I later realized that support for those flags was only added quite recently and that my GCC version is older. …

Read More
Producing optimised NDK code for multiple architectures?

I have some C code for Android that does lots of low-level number crunching. I'd like to know what settings I should use (e.g. for my Android.mk and Application.mk) files so that the code produced will run …

Read More