[LLVMbugs] [Bug 4140] New: clang -print-file-name not consistent with gcc

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=4140

           Summary: clang -print-file-name not consistent with gcc
           Product: new-bugs
           Version: unspecified
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: edwintorok at gmail.com
                CC: llvmbugs at cs.uiuc.edu
            Blocks: 4068


$ gcc -print-file-name=libncursesw.so
/usr/lib/gcc/x86_64-linux-gnu/4.3.3/../../../../lib/libncursesw.so
$ clang
libncursesw.so

This is causing silent failures during evaluating of certain variables in
Makefile, which in turn leads to link failures because a required -l line is
missing.

$ make HOSTCC=clang CC=clang menuconfig
fails with lots of undefined references to symbols in ncurses

The link line is:
clang  -o scripts/kconfig/mconf scripts/kconfig/mconf.o
scripts/kconfig/zconf.tab.o scripts/kconfig/lxdialog/checklist.o
scripts/kconfig/lxdialog/util.o scripts/kconfig/lxdialog/inputbox.o
scripts/kconfig/lxdialog/textbox.o scripts/kconfig/lxdialog/yesno.o
scripts/kconfig/lxdialog/menubox.o

vs. the link line with gcc:
gcc  -o scripts/kconfig/mconf scripts/kconfig/mconf.o
scripts/kconfig/zconf.tab.o scripts/kconfig/lxdialog/checklist.o
scripts/kconfig/lxdialog/util.o scripts/kconfig/lxdialog/inputbox.o
scripts/kconfig/lxdialog/textbox.o scripts/kconfig/lxdialog/yesno.o
scripts/kconfig/lxdialog/menubox.o -lncursesw

This is because check-lxdialog.sh -ldflags clang outputs nothing:
/bin/sh -x
/home/edwin/builds/linux-2.6/scripts/kconfig/lxdialog/check-lxdialog.sh
-ldflags clang
+ tmp=.lxdialog.tmp                                                             
+ trap 'rm -f .lxdialog.tmp' 0 1 2 3 15                                         
+ '[' 2 -eq 0 ']'                                                               
+ cc=                                                                           
+ case "$1" in                                                                  
+ shift                                                                         
+ cc=clang                                                                      
+ ldflags                                                                       
+ for ext in so a dylib                                                         
+ for lib in ncursesw ncurses curses                                            
+ clang -print-file-name=libncursesw.so                                         
+ grep -q /                                                                     
+ '[' 1 -eq 0 ']'                                                               
+ for lib in ncursesw ncurses curses                                            
+ clang -print-file-name=libncurses.so                                          
+ grep -q /                                                                     
+ '[' 1 -eq 0 ']'                                                               
+ for lib in ncursesw ncurses curses                                            
+ clang -print-file-name=libcurses.so                                           
+ grep -q /                                                                     
+ '[' 1 -eq 0 ']'                                                               
+ for ext in so a dylib                                                         
+ for lib in ncursesw ncurses curses                                            
+ clang -print-file-name=libncursesw.a                                          
+ grep -q /                                                                     
+ '[' 1 -eq 0 ']'
+ for lib in ncursesw ncurses curses
+ clang -print-file-name=libncurses.a
+ grep -q /
+ '[' 1 -eq 0 ']'
+ for lib in ncursesw ncurses curses
+ clang -print-file-name=libcurses.a
+ grep -q /
+ '[' 1 -eq 0 ']'
+ for ext in so a dylib
+ for lib in ncursesw ncurses curses
+ clang -print-file-name=libncursesw.dylib
+ grep -q /
+ '[' 1 -eq 0 ']'
+ for lib in ncursesw ncurses curses
+ clang -print-file-name=libncurses.dylib
+ grep -q /
+ '[' 1 -eq 0 ']'
+ for lib in ncursesw ncurses curses
+ clang -print-file-name=libcurses.dylib
+ grep -q /
+ '[' 1 -eq 0 ']'
+ exit 1
+ rm -f .lxdialog.tmp

This is how gcc behaves:
+ tmp=.lxdialog.tmp
+ trap 'rm -f .lxdialog.tmp' 0 1 2 3 15
+ '[' 2 -eq 0 ']'
+ cc=
+ case "$1" in
+ shift
+ cc=gcc
+ ldflags
+ for ext in so a dylib
+ for lib in ncursesw ncurses curses
+ gcc -print-file-name=libncursesw.so
+ grep -q /
+ '[' 0 -eq 0 ']'
+ echo -lncursesw
-lncursesw
+ exit
+ rm -f .lxdialog.tmp


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