Building GCC & libs with -falign-function=512 -g

[DavidTroendle <dtroendle at go dot olemiss dot edu>]

I am doing instruction cache research and need to build from scratch a gcc
(4.8.2 or 4.9) so that all functions in the compiler and the libraries are
aligned to 512 bytes and have debug symbols. 64-bit or 32-bit is OK.

I tried several configure options such as:
  STAGE1_CFLAGS="-g -falign-functions=512" STAGE1_CXXFLAGS="-g
-falign-functions=512" \
  STAGE2_CFLAGS="-g -falign-functions=512" STAGE2_CXXFLAGS="-g
-falign-functions=512" \
  STAGE3_CFLAGS="-g -falign-functions=512" STAGE3_CXXFLAGS="-g
-falign-functions=512" \
  STAGE4_CFLAGS="-g -falign-functions=512" STAGE4_CXXFLAGS="-g
-falign-functions=512" \
  XGCC_FLAGS_FOR_TARGET="-g -falign-functions=512"  \

but I notice most compiles do not have the flags.
Also tried CC="gcc -g -falign-functions=512" etc.  That worked better but
still had many compiles (mostly xgcc and xg++ compiles) without the flag.

Does anyone know the magic flags for accomplishing this?

FYI, I am on Ubuntu 14.04 with gcc 4.8.2.  I did an apt-get build-dep
gcc-4.8 to get all dependencies installed.  So, I am trying to build a
specialized 4.8.2 with 4.8.2.  I was able to build specialized versions of
GMP, MPFR, MPC, etc with no problem.

Thanks in advance.



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