bugGNU Astronomy Utilities - Bugs: bug #57894, Wrong order of flags when...


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bug #57894: Wrong order of flags when configuring Gnuastro 0.11 for x86_64-w64-mingw32

Submitted by:  Mosè Giordano <giordano>
Submitted on:  Tue 25 Feb 2020 04:26:22 PM UTC  
Category:  Installation Severity:  3 - Normal
Item Group:  Configuration file Status:  None
Privacy:  Public Assigned to:  None
Open/Closed:  Open

Tue 25 Feb 2020 11:11:16 PM UTC, comment #1: 

Thanks Mose! This part of the configure script is automatically generated by Gnulib's `AC_LIB_HAVE_LINKFLAGS' macro, its not written by hand. The part that is written by hand is in line 314 of the configure.ac file, where we just define the C function to test with:

AC_LIB_HAVE_LINKFLAGS([cfitsio], [], [
#include <fitsio.h>
void junk(void) {
int status;
fitsfile *f;
ffopen(&f, "junk", READONLY, &status);} ])

Just above that shell `case' statement, on my system, `LIBCFITSIO' expands to `/usr/local/lib/libcfitsio.so -Wl,-rpath -Wl,/usr/local/lib'. So it doesn't start with ` -l', and it falls in the proper condition of `LIBS="$LIBCFITSIO $LIBS"'.

In an attempt to reproduce the problem, I manually set `LIBCFITSIO  =-lcfitsio' and the same compile command came (with `-lcfitsio' after all the other libraries. However, my compiler didn't have a problem!!!

I then noticed that in the end, it doesn't actually use this `LIBS' at all, it resets it with the `LIBS="$ac_save_LIBS"' statement. So in the end, on my system (where the ordering didn't cause a crash), the final value of LIBS is actually set from the `LIBS="$LIBCFITSIO $LIBS"' statement (which is hand-written and can be seen in `configure.ac').

So I think this is a bug in Gnulib (and the `AC_LIB_HAVE_LINKFLAGS' in particualr), if you have the chance, can you post it to them?

Mohammad Akhlaghi <makhlaghi>
Project Administrator
Tue 25 Feb 2020 04:26:22 PM UTC, original submission:  

When cross-compiling Gnuastro 0.11 for x86_64-w64-mingw32, configure fails to find CFITSIO for me:

configure:23857: cc -o conftest.exe -Wall -O3  -pthread -I/workspace/destdir/include  conftest.c -lcurl -lz -lgsl -lgslcblas -lm   -lcfitsio >&5
/opt/x86_64-w64-mingw32/bin/../x86_64-w64-mingw32/sys-root/usr/local/lib/libcfitsio.a(cfileio.o): In function `ffihtps':
/workspace/srcdir/cfitsio-3.47/cfileio.c:7771: undefined reference to `__imp_curl_global_init'
/opt/x86_64-w64-mingw32/bin/../x86_64-w64-mingw32/sys-root/usr/local/lib/libcfitsio.a(cfileio.o): In function `ffchtps':
/workspace/srcdir/cfitsio-3.47/cfileio.c:7784: undefined reference to `__imp_curl_global_cleanup'
collect2: error: ld returned 1 exit status
configure:23857: $? = 1

This happens because the order of the flags is wrong: CFITSIO depends on CURL, so `-lcurl` should follow `-lcfitsio`.  I manually changed line 23838 of `configure` from

      *" -l"*) LIBS="$LIBS $LIBCFITSIO" ;;


      *" -l"*) LIBS="$LIBCFITSIO $LIBS" ;;

but this should probably fixed in one of macros used by `configure.ac`.

Mosè Giordano <giordano>
Project Member


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