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Add a generic GCC stdarg.h header file

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git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@4919 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo
2012-07-08 14:50:43 +00:00
parent 4a0b61ab76
commit a4cc2f6f5b
14 changed files with 296 additions and 26 deletions
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configs/README.txt
+55 -3
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@@ -538,10 +538,62 @@ defconfig -- This is a configuration file similar to the Linux
CONFIG_ARCH_STRNCPY, CONFIG_ARCH_STRLEN, CONFIG_ARCH_STRNLEN
CONFIG_ARCH_BZERO
The architecture may provide custom versions of certain
standard header files:
The architecture may provide custom versions of certain standard header
files:
CONFIG_ARCH_MATH_H, CONFIG_ARCH_STDBOOL_H, CONFIG_ARCH_STDINT_H
CONFIG_ARCH_STDBOOL_H - The stdbool.h header file can be found at
nuttx/include/stdbool.h. However, that header includes logic to redirect
the inclusion of an architecture specific header file like:
#ifdef CONFIG_ARCH_STDBOOL_H
# include <arch/stdbool.h>
#else
...
#endif
Recall that that include path, include/arch, is a symbolic link and
will refer to a version of stdbool.h at nuttx/arch/<architecture>/include/stdbool.h.
CONFIG_ARCH_STDINT_H - Similar logic exists for the stdint.h header
file can also be found at nuttx/include/stdint.h.
#ifdef CONFIG_ARCH_STDBOOL_H
# include <arch/stdinit.h>
#else
...
#endif
CONFIG_ARCH_MATH_H - There is also a re-directing version of math.h in
the source tree. However, it resides out-of-the-way at include/nuttx/math.h
because it conflicts too often with the system math.h. If CONFIG_ARCH_MATH_H=y
is defined, however, the top-level makefile will copy the redirecting
math.h header file from include/nuttx/math.h to include/math.h. math.h
will then include the architecture-specific version of math.h that you
must provide at nuttx/arch/>architecture</include/math.h.
#ifdef CONFIG_ARCH_MATH_H
# include <arch/math.h>
#endif
So for the architectures that define CONFIG_ARCH_MATH_H=y, include/math.h
will be the redirecting math.h header file; for the architectures that
don't select CONFIG_ARCH_MATH_H, the redirecting math.h header file will
stay out-of-the-way in include/nuttx/.
CONFIG_ARCH_STDARG_H - There is also a redirecting version of stdarg.h in
the source tree as well. It also resides out-of-the-way at include/nuttx/stdarg.h.
This is because you should normally use your toolchain's stdarg.h file. But
sometimes, your toolchain's stdarg.h file may have other header file
dependencies and so may not be usable in the NuttX build environment. In
those cases, you may have to create a architecture-specific stdarg.h header
file at nuttx/arch/>architecture</include/stdarg.h
If CONFIG_ARCH_STDARG_H=y is defined, the top-level makefile will copy the
re-directing stdarg.h header file from include/nuttx/stdarg.h to
include/stdarg.h. So for the architectures that cannot use their toolchain's
stdarg.h file, they can use this alternative by defining CONFIG_ARCH_STDARG_H=y
and providing. If CONFIG_ARCH_STDARG_H, is not defined, then the stdarg.h
header file will stay out-of-the-way in include/nuttx/.
CONFIG_ARCH_ROMGETC - In Harvard architectures, data accesses and
instruction accesses occur on different busses, perhaps