Follow-up Comment #4, sr#110660 (group autoconf):
>From this minimal configure.ac
AC_INIT([test], [1.0])
AC_PROG_CC
AC_CHECK_SIZEOF([size_t])
AC_CONFIG_HEADERS([config.h])
AC_OUTPUT
autoconf 2.71 generates a configure script which successfully detects the size
of size_t when given a compiler that supplies stddef.h and stdint.h but not
stdlib.h:
$ ./configure --host=aarch64-unknown-none CC="gcc -ffreestanding -nostdinc
-nostdlib -nostartfiles -isystem
/usr/lib/gcc/aarch64-unknown-linux-gnu/12.1.0/include"
checking for aarch64-unknown-none-gcc... gcc -ffreestanding -nostdinc
-nostdlib -nostartfiles -isystem
/usr/lib/gcc/aarch64-unknown-linux-gnu/12.1.0/include
checking whether the C compiler works... yes
checking for C compiler default output file name... a.out
checking for suffix of executables...
checking whether we are cross compiling... yes
checking for suffix of object files... o
checking whether the compiler supports GNU C... yes
checking whether gcc -ffreestanding -nostdinc -nostdlib -nostartfiles -isystem
/usr/lib/gcc/aarch64-unknown-linux-gnu/12.1.0/include accepts -g... yes
checking for gcc -ffreestanding -nostdinc -nostdlib -nostartfiles -isystem
/usr/lib/gcc/aarch64-unknown-linux-gnu/12.1.0/include option to enable C11
features... none needed
checking for stdio.h... no
checking for stdlib.h... no
checking for string.h... no
checking for inttypes.h... no
checking for stdint.h... yes
checking for strings.h... no
checking for sys/stat.h... no
checking for sys/types.h... no
checking for unistd.h... no
checking size of size_t... 8
configure: creating ./config.status
config.status: creating config.h
I also manually inspected configure and verified that it would not have
malfunctioned if stdint.h hadn't been available. Since stddef.h must be
provided even by a freestanding implementation of C89, I don't think there's
anything left to do for this bug report and I'm going to go ahead and close
it. Please file new bugs if you encounter any more problems with running
configure scripts against freestanding implementations of C.
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