Initial scripts compatible with Dash (minimalistic POSIX)

Until now, the initial project scripts were primarily tested with GNU
Bash. But Bash is not generally available on all systems (it has many
features beyond POSIX). Because of this, effectively we were imposing the
requirement on the user that they must have Bash installed. We recently
started this with setting the shebang of `project' and
`reproduce/software/bash/configure.sh' to `/bin/sh'. After doing so, Raul
and Gaspar reported an error on their systems.

To fix the problem, I installed Dash (a minimalist POSIX-compliant shell)
on my computer and temporarily set the shebangs to `/bin/dash', ran the
project configuration step and fixed all issues that came up. With this
commit, it can go all the way to building GCC on my system's Dash. After
this stage (when `high-level.mk' is called), there is no problem, because
we have our own version of GNU Bash and that installed version is used.
Probably some more issues still remain and will hopefully be found in the
future.

While doing this, I also noticed the following two minor issues:

 - The `./project configure' option `--input-dir' was not recognized
   because it was mistakenly checking `--inputdir'. It has been corrected.

 - The test C programs now use the `<<EOF' method instead of `echo'.

 - In `basic.mk', the extra space between `syspath' and `:=' was removed
   (it was an ancient relic!).

2 files changed, 47 insertions, 35 deletions

diff --git a/reproduce/software/bash/configure.sh b/reproduce/software/bash/configure.sh
index 6e5abb8..a4b3e64 100755
--- a/reproduce/software/bash/configure.sh
+++ b/reproduce/software/bash/configure.sh
@@ -57,7 +57,8 @@ glconf=$cdir/gnuastro/gnuastro-local.conf
 # In case someone opens the files output from the configuration scripts in
 # a text editor and wants to edit them, it is important to let them know
 # that their changes are not going to be permenant.
-function create_file_with_notice() {
+create_file_with_notice ()
+{
     if echo "# IMPORTANT: file can be RE-WRITTEN after './project configure'" > "$1"
     then
         echo "#"                                                      >> "$1"
@@ -81,7 +82,8 @@ function create_file_with_notice() {
 #
 # Since the build directory will go into a symbolic link, we want it to be
 # an absolute address. With this function we can make sure of that.
-function absolute_dir() {
+absolute_dir ()
+{
     if stat "$1" 1> /dev/null; then
         echo "$(cd "$(dirname "$1")" && pwd )/$(basename "$1")"
     else
@@ -239,7 +241,7 @@ EOF
     bdir=
     currentdir=$(pwd)
     junkname=pure-junk-974adfkj38
-    while [ x$bdir == x ]
+    while [ x$bdir = x ]
     do
         # Ask the user (if not already set on the command-line).
         if [ x"$build_dir" = x ]; then
@@ -264,10 +266,12 @@ EOF
             fi
         fi
 
-        # Make sure the given directory is not a subdirectory of the
-        # source directory.
+        # If its given, make sure it isn't a subdirectory of the source
+        # directory.
         if ! [ x"$bdir" = x ]; then
-            if [[ $bdir == $currentdir* ]]; then
+            echo "Given build directory: $bdir"
+            if echo "$bdir/" \
+                    | grep '^'$currentdir 2> /dev/null > /dev/null; then
 
                 # If it was newly created, it will be empty, so delete it.
                 if ! [ "$(ls -A $bdir)" ]; then rm --dir $bdir; fi
@@ -638,13 +642,13 @@ fi
 # particular) to be present.
 hascc=0;
 if type cc > /dev/null 2>/dev/null; then
-    if type c++ > /dev/null 2>/dev/null; then hascc=1; fi
+    if type c++ > /dev/null 2>/dev/null; then export CC=cc; hascc=1; fi
 else
     if type gcc > /dev/null 2>/dev/null; then
-        if type g++ > /dev/null 2>/dev/null; then hascc=1; fi
+        if type g++ > /dev/null 2>/dev/null; then export CC=gcc; hascc=1; fi
     else
         if type clang > /dev/null 2>/dev/null; then
-            if type clang++ > /dev/null 2>/dev/null; then hascc=1; fi
+            if type clang++ > /dev/null 2>/dev/null; then export CC=clang; hascc=1; fi
         fi
     fi
 fi
@@ -676,14 +680,15 @@ gcc_works=0
 testprog=$tmpblddir/test-c
 testsource=$tmpblddir/test.c
 echo; echo; echo "Checking host C compiler...";
-echo "#include <stdio.h>"                                  > $testsource
-echo "#include <stdlib.h>"                                >> $testsource
-echo "int main(void){printf(\"...C compiler works.\n\");" >> $testsource
-echo "               return EXIT_SUCCESS;}"               >> $testsource
-if gcc $testsource -o$testprog && $testprog; then
+cat > $testsource <<EOF
+#include <stdio.h>
+#include <stdlib.h>
+int main(void){printf("...C compiler works.\n");
+               return EXIT_SUCCESS;}
+EOF
+if $CC $testsource -o$testprog && $testprog; then
     rm $testsource $testprog
 else
-    rm $testsource
     cat <<EOF
 
 ______________________________________________________
@@ -723,10 +728,12 @@ fi
 # LLVM's linker don't accept it an can cause problems.
 oprog=$sdir/rpath-test
 cprog=$sdir/rpath-test.c
-echo "#include <stdio.h>"          > $cprog
-echo "int main(void) {return 0;}" >> $cprog
-if [ x$CC = x ]; then CC=gcc; fi;
-if $CC $cprog -o$oprog -Wl,-rpath-link &> /dev/null; then
+cat > $cprog <<EOF
+#include <stdio.h>
+#include <stdlib.h>
+int main(void) {return EXIT_SUCCESS;}
+EOF
+if $CC $cprog -o$oprog -Wl,-rpath-link 2>/dev/null > /dev/null; then
     export rpath_command="-Wl,-rpath-link=$instdir/lib"
 else
     export rpath_command=""
@@ -755,7 +762,11 @@ main(void) {
     return 0;
 }
 EOF
-if gcc $cprog -o$oprog &> /dev/null; then needs_ldl=no; else needs_ldl=yes; fi
+if $CC $cprog -o$oprog 2>/dev/null > /dev/null; then
+    needs_ldl=no;
+else
+    needs_ldl=yes;
+fi
 rm -f $oprog $cprog
 
 
@@ -782,7 +793,7 @@ static_build=no
 #echo "#include <stdio.h>"          > $cprog
 #echo "int main(void) {return 0;}" >> $cprog
 #if [ x$CC = x ]; then CC=gcc; fi;
-#if $CC $cprog -o$oprog -static &> /dev/null; then
+#if $CC $cprog -o$oprog -static > /dev/null; then
 #    export static_build="yes"
 #else
 #    export static_build="no"
@@ -890,12 +901,14 @@ if [ x"$host_cc" = x0 ]; then
     testprog=$tmpblddir/test-c
     testsource=$tmpblddir/test.c
     echo; echo; echo "Checking if static C library is available...";
-    echo "#include <stdio.h>"                       > $testsource
-    echo "#include <stdlib.h>"                     >> $testsource
-    echo "#include <sys/cdefs.h>"                  >> $testsource
-    echo "int main(void){printf(\"...yes\n\");"    >> $testsource
-    echo "               return EXIT_SUCCESS;}"    >> $testsource
-    cc_call="gcc $testsource $CPPFLAGS $LDFLAGS -o$testprog -static -lc"
+    cat > $testsource <<EOF
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/cdefs.h>
+int main(void){printf("...yes\n");
+               return EXIT_SUCCESS;}
+EOF
+    cc_call="$CC $testsource $CPPFLAGS $LDFLAGS -o$testprog -static -lc"
     if $cc_call && $testprog; then
         gccwarning=0
         good_static_libc=1
@@ -912,7 +925,7 @@ if [ x"$host_cc" = x0 ]; then
 !!!!!!!!!!!!!!!!!!!!!!         Warning        !!!!!!!!!!!!!!!!!!!!!!
 !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
 
-The 'sys/cdefs.h' headaer cannot be included, or a usable static C library
+The 'sys/cdefs.h' header cannot be included, or a usable static C library
 ('libc.a', in any directory) cannot be used with the current settings of
 this system. SEE THE ERROR MESSAGE ABOVE.
 
@@ -927,7 +940,7 @@ be installed with this command:
 
     $ sudo yum install glibc-static
 
-2) If you have 'libc.a' and `sys/cdefs.h', but in a non-standard location (for
+2) If you have 'libc.a' and 'sys/cdefs.h', but in a non-standard location (for
 example in '/PATH/TO/STATIC/LIBC/libc.a' and
 '/PATH/TO/SYS/CDEFS_H/sys/cdefs.h'), please run the commands below, then
 re-configure the project to fix this problem.
@@ -1057,13 +1070,12 @@ will be installed in:
 **TIP**: you can see which software is being installed at every moment with
 the following command. See "Inspecting status" section of
 'README-hacking.md' for more. In short, run it while the project is being
-configured (in another terminal, but on this same directory: '`pwd`'):
+configured (in another terminal, but on this same directory: 'pwd'):
 
-  $ while true; do echo; date; ls .build/software/build-tmp; sleep 1; done
+  $ ./project --check-config
 
 -------------------------
 
-
 EOF
     sleep $tsec
 fi
@@ -1281,8 +1293,8 @@ fi
 # After everything is installed, we'll put all the names and versions in a
 # human-readable paragraph and also prepare the BibTeX citation for the
 # software.
-function prepare_name_version() {
-
+prepare_name_version ()
+{
     # First see if the (possible) `*' in the input arguments corresponds to
     # anything. Note that some of the given directories may be empty (no
     # software installed).
diff --git a/reproduce/software/make/basic.mk b/reproduce/software/make/basic.mk
index 48ba3de..7e900b8 100644
--- a/reproduce/software/make/basic.mk
+++ b/reproduce/software/make/basic.mk
@@ -48,7 +48,7 @@ ibidir  = $(BDIR)/software/installed/version-info/proglib
 
 # We'll need the system's PATH for making links to low-level programs we
 # won't be building ourselves.
-syspath         := $(PATH)
+syspath := $(PATH)
 
 # As we build more programs, we want to use this project's built programs
 # and libraries, not the host's.