Missing stdint.h

[rhughes]

Hello All

I am running Ubuntu 12.04 x64

I have (apparently) completed Step 1 of setting up a Cross Compiler as defined here: http://wiki.osdev.org/GCC_Cross-Compiler

When I try to compile the Kernel.c code described here: http://wiki.osdev.org/Bare_Bones

I get the attached error.

I have actioned: make all-target-libgcc
make install-target-libgcc

So I am guessing it is a directory error of some sort.

I am more of a Windows person than Linux so forgive me if this is a simple issue to solve.

Thank you all very much for your help,

Richard Hughes

[Love4Boobies]

The problem is actually with the GCC Cross-Compiler article. The Bare Bones tutorial was recently updated to use the freestanding library for portability reasons, yet the GCC cross-compiler is built using the --without-headers flag. I'm not sure whether there's a configuration flag to instruct only the installation of the freestanding library or whether it needs to be installed separately but I will take a look and update the wiki accordingly. In the meantime, you can temporarily write your own implementation of <stdint.h> (for the purposes of that tutorial, it only needs to have "typedef unsigned int uint32_t;" --- note that this is specific to the GCC cross-compiler you have built, don't expect it to work everywhere) or use one of these libraries.

[Love4Boobies]

For 64-bit compatibility, he'd want uint32_t to be a 64-bit unsigned integer type? For 64-bit incompatibility, maybe. My version works with both the AMD64 and Inte386 SysV ABIs.

[bluemoon]

I build cross compiler according to the wiki article, the standard header is shipped with libgcc even with --without-headers

Code: Select all

$ ls /usr/local/cross/lib/gcc/x86_64-elf/4.6.3/include
abmintrin.h  bmmintrin.h     float.h       iso646.h     mm_malloc.h     smmintrin.h  stdfix.h      tgmath.h     wmmintrin.h
ammintrin.h  cpuid.h         fma4intrin.h  lwpintrin.h  nmmintrin.h     stdarg.h     stdint-gcc.h  tmmintrin.h  x86intrin.h
avxintrin.h  cross-stdarg.h  ia32intrin.h  mm3dnow.h    pmmintrin.h     stdbool.h    stdint.h      unwind.h     xmmintrin.h
bmiintrin.h  emmintrin.h     immintrin.h   mmintrin.h   popcntintrin.h  stddef.h     tbmintrin.h   varargs.h    xopintrin.h

PS: Don't sudo gcc for the obvious reason.

[Solar]

<stdint.h> is built regardless, that is correct. If the options we give in the tutorials don't make those includes "visible", we should change them...

I don't have a cross-compiler active ATM so I cannot test, and I don't really have the time to set things up for testing... someone else to step into the breach?

[bluemoon]

I just add -I/usr/local/cross/..... to the compile option until I pull in newlib, which also provide those headers.

[Love4Boobies]

I didn't notice you wrote size_t rather than uint32_t either. Your second snippet isn't C, it's GCC-ism, so I would have to disagree with it.

[Love4Boobies]

If you're using it with clang, it's because it supports GCC-specific extensions. Regardless of what compiler you're using, it's not really C.

[Love4Boobies]

Fair enough. Given that the OP mentioned the Bare Bones tutorial, I just happened to make the mistake of thinking that your answer wasn't about the wrong data type, wrong compiler, and wrong language.