gcc [JZ Wiki]

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====== GCC ======

===== Compile =====
<code bash>
g++ mylib1.cpp
g++ mylib2.cpp

# shared
g++ -shared -fPIC -o libmylib.so mylib1.o mylib2.o
g++ -o main main.cpp libmylib.so
LD_LIBRARY_PATH=. ./main

# static
ar rcs libmylib.a mylib1.o mylib2.o
g++ -o main main.cpp -L. lmylib
./main

# prevents linking with the shared libraries
g++ -static -o main main.cpp -L. lmylib
</code>

===== Distinguish An ELF Binary is Hard-float or Soft-float =====

<code>
readelf -a [elf-bin] | grep 'VFP registers' # Hard-float
readelf -a [elf-bin] | grep 'Tag_ABI_HardFP_use' # Soft-float
</code>

https://www.cnx-software.com/2013/04/22/how-to-detect-if-an-arm-elf-binary-is-hard-float-armhf-or-soft-float-armel/


===== ARM GCC Toolchain =====

**New Release**

[[https://releases.linaro.org/components/toolchain/binaries/]]

**Archive**

[[https://releases.linaro.org/archive/14.08/components/toolchain/gcc-linaro/4.8/]]

[[https://www.linaro.org/downloads/]]


**Ref**
  * http://codingstandards.iteye.com/blog/1142358
  * https://www.ptt.cc/bbs/LinuxDev/M.1162669989.A.2E6.html