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cpp,
the GNU preprocessor
cpp
merges in the #include
files, expands all macros definitions, and processes the
#ifdef sections.
To see the output of cpp,
invoke gcc
with the -E
option, and the preprocessed file will be printed on stdout.
There
are two convenient options to assemble handwritten files that require C-style
preprocessing. Both options depend on using the compiler driver program,
gcc,
instead of calling the assembler directly.
-
Name the source file using the
extension .S
(capitalized) rather than .s.
gcc
recognizes files with this extension as assembly language requiring C-style
preprocessing.
-
Specify the “source language”
explicitly for this situation, using the option, -xassembler-with-cpp.
For more
information on cpp,
see The C Preprocessor
in GNUPro Compiler Tools.
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