emerge zlib inexplicably removes space from CFLAGS

[asymptotic]

Dear All,

In my make.conf, I set

CFLAGS="-march=atom -mssse3 -mfpmath=sse -fomit-frame-pointer -Os -pipe"

Normally, that works fine. But today, when I try to emerge zlib 1.2.7, emerge inexplicably removes a space from this CFLAGS setting, and tries to run (for example)

cc -march=atom-mssse3 -mfpmath=sse -fomit-frame-pointer -Os -pipe -DNO_FSEEKO -DNO_STRERROR -DNO_snprintf -DHAS_sprintf_void -I. -c -o example.o test/example.c

Not surprisingly, this leads to an emerge failure with the error message

test/example.c:1:0: error: bad value (atom-mssse3) for -march= switch

Any ideas, please?

[asymptotic]

Sorry, my bad. I had a stray value sitting in the CFLAGS environment variable, which, at this stage of the build, was overriding the value in make.conf.