Re: Default LDFLAGS in build system - possible problems

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* Zdenek Dohnal:

> I, as Fedora's vim co-maintainer, encountered the issue with default
> LDFLAGS.
>
> I tried to manually run configure script for Vim, with ruby support
> enabled, but it always failed with error message about missing ncurses
> (ncurses-devel was installed though). When I looked into config.log, I saw:
>
> configure:12069: gcc -o conftest -g -O2  -L. -Wl,-z,relro   -Wl,-z,now
> -specs=/usr/lib/rpm/redhat/redhat-hardened-ld -fstack-protector
> -rdynamic -Wl,-export-dynamic  -L/usr/local/lib conftest.c  -lselinux 
> -lncurses >&5
> conftest.c: In function 'main':
> conftest.c:67:26: warning: implicit declaration of function 'tgetent'
> [-Wimplicit-function-declaration]
>  char s[10000]; int res = tgetent(s, "thisterminaldoesnotexist");
>                           ^~~~~~~
> /usr/bin/ld: /tmp/ccivPtT5.o: relocation R_X86_64_32 against
> `.rodata.str1.1' can not be used when making a PIE object; recompile
> with -fPIC
> /usr/bin/ld: final link failed: nonrepresentable section on output
> collect2: error: ld returned 1 exit status

This is a bug in the configure script.  It needs to pass the original
CFLAGS when compiling link tests.

The command is set correctly initially:

| ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'

So something appears to reset CFLAGS in the script.

Thanks,
Florian
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