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Compiler Command-line Options
Note
If you compile with --lower_rwpi, then the static initialization is done at runtime by the
C++ constructor mechanism, even for C. This enables these static initializations to work
with RWPI code.
See also
• --apcs=qualifer...qualifier on page 2-4
• --lower_ropi, --no_lower_ropi on page 2-87
• Position independence qualifiers on page 2-24 in the Compiler User Guide.
2.1.108 --ltcg
This option instructs the compiler to create objects in an intermediate format so that
link-time code generation optimizations can be performed. The optimizations applied
include cross-module inlining to improve performance, and sharing of base addresses
to reduce code size.
Note
This option might significantly increase link time and memory requirements. For large
applications it is recommended that you do the code generation in partial link steps with
a subset of the objects.
Example
The following example shows how to use the --ltcg option.
armcc -c --ltcg file1.c
armcc -c --ltcg file2.c
armlink --ltcg file1.o file2.o -o prog.axf
See also
• --multifile, --no_multifile on page 2-92
• -Onum on page 2-96
• --ltcg on page 2-59 in the Linker Reference Guide.
2.1.109 -M
This option instructs the compiler to produce a list of makefile dependency lines
suitable for use by a make utility.
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