[Bug other/42280] New: libiberty configure script fails checking pid_t when without-headers

["viriketo at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

Trying to build a gcc 4.4.2 for 'baremetal' targets, in my case for later libc
building, I find that the libiberty configure script at some stage checks for
some libc headers to be available.

I'm calling the gcc main configure with "--without-headers". The total flags
are:
--prefix=/nix/store/bqyab4kls4czwyzazmrjbf2y62xiil48-gcc-4.4.2-armv5tel-unknown-linux-uclibceabi-stage-static
--with-ppl=/nix/store/kdsz815whid3giyi9ll3bshxdmp3jyyj-ppl-0.10.2
--with-cloog=/nix/store/zidphypb94508svrm4b2dxj9bhwpp2fr-cloog-ppl-0.15.4
--with-gmp=/nix/store/sli4r6plz8bkbizia8mr8p0rhxvrk06v-gmp-4.3.1
--with-mpfr=/nix/store/q5x2ajrskdj5bv2md78k5yqapdiy0sqg-mpfr-2.4.1
--disable-libstdcxx-pch
--without-included-gettext
--with-system-zlib
--enable-languages=c
--target=armv5tel-unknown-linux-uclibceabi
--disable-libssp
--disable-nls
--without-headers
--disable-threads
--disable-libmudflap
--disable-libgomp
--disable-shared

I could build gcc 4.3.4 perfectly with the options I was using.

The concerning contents at the directory
build/armv5tel-unknown-linux-uclibceabi/libiberty/config.log give:
configure:5359:
/tmp/nix-build-12l4vcfky0013w4gx5fpky81s4gb90gd-gcc-4.4.2-armv5tel-unknown-linux-uclibceabi-stage-static.drv-0/build/./gcc/xgcc
-B/tmp/nix-build-12l4vcfky0013w4gx5fpky81s4gb90gd-gcc-4.4.2-armv5tel-unknown-linux-uclibceabi-stage-static.drv-0/build/./gcc/
-B/nix/store/bqyab4kls4czwyzazmrjbf2y62xiil48-gcc-4.4.2-armv5tel-unknown-linux-uclibceabi-stage-static/armv5tel-unknown-linux-uclibceabi/bin/
-B/nix/store/bqyab4kls4czwyzazmrjbf2y62xiil48-gcc-4.4.2-armv5tel-unknown-linux-uclibceabi-stage-static/armv5tel-unknown-linux-uclibceabi/lib/
-isystem
/nix/store/bqyab4kls4czwyzazmrjbf2y62xiil48-gcc-4.4.2-armv5tel-unknown-linux-uclibceabi-stage-static/armv5tel-unknown-linux-uclibceabi/include
-isystem
/nix/store/bqyab4kls4czwyzazmrjbf2y62xiil48-gcc-4.4.2-armv5tel-unknown-linux-uclibceabi-stage-static/armv5tel-unknown-linux-uclibceabi/sys-include
-c -B/lib -idirafter /include  -Wl,-L/lib    conftest.c >&5
conftest.c:41:19: error: stdio.h: No such file or directory
conftest.c:43:24: error: sys/types.h: No such file or directory
conftest.c:46:23: error: sys/stat.h: No such file or directory
conftest.c:53:22: error: stdlib.h: No such file or directory
conftest.c:58:22: error: memory.h: No such file or directory
conftest.c:60:21: error: string.h: No such file or directory
conftest.c:63:22: error: strings.h: No such file or directory
conftest.c:66:23: error: inttypes.h: No such file or directory
conftest.c:73:21: error: unistd.h: No such file or directory
conftest.c: In function 'main':
conftest.c:78: error: 'pid_t' undeclared (first use in this function)
conftest.c:78: error: (Each undeclared identifier is reported only once
conftest.c:78: error: for each function it appears in.)
conftest.c:78: error: expected expression before ')' token
configure:5365: $? = 1


-- 
           Summary: libiberty configure script fails checking pid_t when
                    without-headers
           Product: gcc
           Version: 4.4.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: other
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: viriketo at gmail dot com
 GCC build triplet: x86_64-linux
  GCC host triplet: x86_64-linux
GCC target triplet: armv5tel-unknown-linux-uclibceabi


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42280