Resources for Portable Programming

• C99 standard (technically a final draft: currently unavailable). And its rationale.
• C11 standard (technically a final draft). Not that C11 is yet supported by real-world R platforms.
  An overview of the changes.
• Fortran standards, including links to the F77 standard and to draft current standards as well as the correct layout of Fortran 77 subprograms. The final draft F2003 standard is here in PDF.
ftnchek, a program to check against Fortran standards.
• POSIX 1003 standards (2008): how Unix-alike functions and tools are to behave.
• POSIX 1003 standards (2004): how Unix-alike functions and tools are to behave.
• Porting to 64 bit GNU/Linux systems. Covers a lot of details about 64- vs 32-bit architectures.
• The self-styled Filesystem Hierarchy Standard. Not written to the standard of a standard, but Debian Linux policy.
• How to write shared libraries. Lots of information on GCC 4.0.0 features, including controlling symbol visibility as implemented in R 2.3.0.
• mudflap. A bounds-checking (etc) tool for GCC 4.
• Valgrind. A debugging tool for ix86 Linux. (See also `Writing R Extensions'.)
• GCC Links and selected readings
• What Every Computer Scientist Should Know about Floating-Point Arithmetic by David Goldberg, including Doug Priest's supplement on extended-precision systems (such as ix86).
• FreeBSD's collection of man pages (including for some commercial Unixes).
• Jan Walter's Unix incompatibility notes. Not 100% reliable (please don't pretest isalpha by isascii, for example).