How to generate C/C++ Shared Library for Linux 32-bit target from Linux 64-bit Host?

Hi,

I am working in a Matlab design and I have intend to use the Matlab Coder for Linux 32 bits target. However, the Matlab Coder provide support only to generate shared library for Linux 64 bits target. Then I made a workaround to generate shared library via Matlab Coder with the following changes (adding –m32 flag) in makefile (*.mk), such as:

    -  CFLAGS               = -m32 -c $(ANSI_OPTS) -fPIC  -O0 $(CDEBUG)

    -  CPPFLAGS             = -m32 -c $(CPP_ANSI_OPTS) -fPIC  -O0  $(CPPDEBUG)

    -  CPP_LDFLAGS          = -m32 -Wl,-rpath,"$(MATLAB_ARCH_BIN)",-L"$(MATLAB_ARCH_BIN)"  $(CPPLDDEBUG)

    -  CPP_SHAREDLIB_LDFLAGS  = -m32 -shared -Wl,-rpath,"$(MATLAB_ARCH_BIN)",-L"$(MATLAB_ARCH_BIN)" -Wl,--no-undefined  $(CPPLDDEBUG)

I am wondering, if I can change the makefile in order to cross-compile for Linux 32 bits target and why the Matlab does not provide by default this setting? And, what can I lose (performance, possible problems, etc.) with it workaround?

Below it follows my environment settings:

- Host: Linux 64 bits (Debian 8.3), kernel 3.16.0

- Matlab: 9.0.0.341360 (R2016A)

- Matlab Coder: Version 3.1 (R2016a)

- Target: Linux 32 bits, kernel 2.6.32

Thank in advance,

Bruno

Answer 1

[Raghu Boggavarapu]

You can use coder.updateBuildInfo to add custom compiler flags. In your case its '-m32' .