Some help enabling whole program optimization? \ VOGONS

Some help enabling whole program optimization?

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First post, by Serious Callers Only

Posted on 2012-10-30, 16:57

Serious Callers Only Offline

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Do you people know how to make a program be compiled with whole program optimization if one of the o files is output from a different make toolchain (cmake in this case, for the mt32emu library) that what will be used for the rest of the o files and linker (make, from the dosbox svn, with the makefile changed to add the mt32emu lib:
+dosbox_LDADD += munt/libmt32emu.a
).

I suspect this can blow up.

Reply 1 of 4, by bloodbat

Posted on 2012-10-30, 17:38

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All cmake does is generate make files for different platforms. I don't think it would blow up.

Reply 2 of 4, by Serious Callers Only

Posted on 2012-10-30, 19:21

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Ok then, so it's just compile with -flto on both and -flto -fwhole-program on the final step then?

Reply 3 of 4, by bloodbat

Posted on 2012-10-30, 19:29

bloodbat Offline

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Yeah, I don't think it would be a problem.

Reply 4 of 4, by Serious Callers Only

Posted on 2012-10-31, 06:43

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Is there something extraordinarily broken about this?

1#!/usr/bin/make -f
2
3%:
4	dh $@
5override_dh_auto_configure:
6#build mt32emu from the nested launchpad repository prior to building dosbox
7#the patch for using mt32driver also adds dosbox_LDADD += " munt/libmt32emu.a"; dosbox_CFLAGS = " -O3 -flto -fwhole-program"; to the dosbox makefile
8#remember, each indented line in a rules file is run on a shell (this first line can't be separated)
9	cd src/munt;cmake mt32emu -D CMAKE_CXX_FLAGS "-O3 -flto";make
10	mv src/munt/include/mt32emu/ include
11	./autogen.sh
12	dh_auto_configure -- --enable-core-inline

Well, guess i will know when it builds tomorrow, but there isn't any weird problem with -O3, or something i'm missing for better performance in this hacked up compile right?

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