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Add compiler option examples #462

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37 changes: 37 additions & 0 deletions cmake/sample_defs/arch_build.cmake
Original file line number Diff line number Diff line change
@@ -0,0 +1,37 @@
#
# Example arch_build.cmake
# -------------------------
#
# This file will be automatically included in the arch-specific build scope
#
# Definitions and options specified here will be used when cross-compiling
# _all_ FSW code for _all_ targets defined in targets.cmake.
#
# Avoid machine-specific code generation options in this file (e.g. -f,-m options); such
# options should be localized to the toolchain file such that they will only be
# included on the machines where they apply.
#
# CAUTION: In heterogeneous environments where different cross compilers are
# used for different CPUs, particularly if from different vendors, it is likely
# that compile options will need to be different as well.
#
# In general, options in this file can only be used in cases where all CPUs use a
# compiler from the same vendor and/or are all GCC based such that they accept similar
# command line options.
#
# This file can alternatively be named as "arch_build_${TARGETSYSTEM}.cmake"
# where ${TARGETSYSTEM} represents the system type, matching the toolchain.
#
# These example options assume a GCC-style toolchain is used for cross compilation,
# and uses the same warning options that are applied at the mission level.
#
add_compile_options(
-std=c99 # Target the C99 standard (without gcc extensions)
-pedantic # Issue all the warnings demanded by strict ISO C
-Wall # Warn about most questionable operations
-Wstrict-prototypes # Warn about missing prototypes
-Wwrite-strings # Warn if not treating string literals as "const"
-Wpointer-arith # Warn about suspicious pointer operations
-Werror # Treat warnings as errors (code should be clean)
)

27 changes: 27 additions & 0 deletions cmake/sample_defs/mission_build.cmake
Original file line number Diff line number Diff line change
@@ -0,0 +1,27 @@
#
# Example mission_build.cmake
# ---------------------------
#
# This file will be automatically included in the top level ("mission") build scope
#
# Definitions and options specified here will be used when building local tools and
# other code that runs on the development host, but do _NOT_ apply to flight software
# (embedded) code or anything built for the target machine.
#
# These options assume a GCC toolchain but a similar set should be applicable to clang.
#
add_compile_options(
-std=c99 # Target the C99 standard (without gcc extensions)
-pedantic # Issue all the warnings demanded by strict ISO C
-Wall # Warn about most questionable operations
-Wstrict-prototypes # Warn about missing prototypes
-Wwrite-strings # Warn if not treating string literals as "const"
-Wpointer-arith # Warn about suspicious pointer operations
-Werror # Treat warnings as errors (code should be clean)
)

# The _XOPEN_SOURCE directive is required for glibc to enable conformance with the
# the X/Open standard version 6, which includes POSIX.1c as well as SUSv2/UNIX98 extensions.
add_definitions(
-D_XOPEN_SOURCE=600
)