问题
I need to disable optimization flag for a individual file using autotools. What is the best way to do it?
回答1:
Do you mean an individual source file or an individual executable?
To disable optimization for an executable is simple:
bin_PROGRAMS = myprog
myprog_SOURCES = foo.c bar.c
myprog_CFLAGS = -O0
If you mean that you want to disable the optimization for a single source file temporarily, say for debugging purposes, you can just remake that file at the prompt: (example from the automake manual)
rm bar.o
make CFLAGS=-O0 bar.o
make
To do it for an individual source file permanently is not so simple, and probably best done by creating a convenience library:
noinst_LIBRARIES = libnoopt.a
libnoopt_a_SOURCES = bar.c
libnoopt_a_CFLAGS = -O0
bin_PROGRAMS = myprog
myprog_SOURCES = foo.c
myprog_CFLAGS = -O2
myprog_LDADD = libnoopt.a
来源：https://stackoverflow.com/questions/2220855/what-is-the-best-way-to-set-compilation-flags-for-individual-source-files-using