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This directory contains tests for link-time optimization (LTO).

Tests in this directory may span multiple files, so the naming of

the files is significant.

The name of every file must end with '_N' where N is an integer.

All the files with the same name base and different _N suffixes

will be compiled separately and linked together to form the final

executable.

By default, each set of files will be compiled with list of

options listed in LTO_OPTIONS (../../lib/lto.exp), which can be

overwritten in the shell environment or using the 'dg-lto-options'

command in the main file of the set (i.e., the file with _0

suffix).

For example, given the files a_0.C a_1.C a_2.C, they will be

compiled as:

$ g++ -c  a_0.C

$ g++ -c  a_1.C

$ g++ -c  a_2.C

$ g++ -o  a_0.o a_1.o a_2.o

Tests that do not need more than one file are a special case

where there is a single file named 'foo_0.C'.

The only supported dg-lto-do option are 'compile', 'run' and 'link'.

Additionally, these can only be used in the main file.  If

'compile' is used, only the individual object files are

generated.  If 'link' is used, the final executable is generated

but not executed (in this case, function main() needs to exist

but it does not need to do anything).  If 'run' is used, the

final executable is generated and the resulting binary executed.

The default value for dg-lto-do is 'run'.