Travis: Add gcc 4.4 and 4.5

[nelhage]

I'm not opposed to this, but I'm curious if there was a specific motivation here. Did you run into problems with a particular GCC version or do you think reptyr is particularly likely to run into such problems?

[scop]

It's something I tried while trying to track down #67, #68, and #69.

-Werror in reptyr's CFLAGS does make it prone to build errors with different compiler versions (and other stuff in CFLAGS, like demonstrated by #68). Maybe the Travis builds should in addition to different compilers be build both without any -O (like at the moment) as well as with e.g. -O2?

[nelhage]

My suspicion is that 4.4 and 4.5 aren't disparate enough to be likely to surface bugs, and that a lot of your problems are related to older kernel headers, which unfortunately aren't easy to test via Travis.

I'd be happy to take a change to optionally disable -Werror in the Makefile, if that would make your life easier in that regard.

[scop]

Well, there's not much difference in say make WERROR= and sed -i -e 's/ -Werror//' Makefile, especially since I'm dealing with the Fedora/EPEL reptyr package builds which means I won't be typing that often at all. But it would be cleaner if the CFLAGS I set anyway would be appended to the reptyr defaults instead of the other way around; then I could do make CFLAGS="$whatever_i_do_anyway -Wno-error", maybe something like:

--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,5 @@
-override CFLAGS+=-Wall -Werror -D_GNU_SOURCE -g
+ALL_CFLAGS := -Wall -Werror -D_GNU_SOURCE -g $(CFLAGS)
+override CFLAGS = $(ALL_CFLAGS)

[nelhage]

How do you feel about that fix I just pushed?

[scop]

Seems fine, thanks.