why is -L/usr/local/lib necessary?

why is -L/usr/local/lib necessary?

[Sam Steingold]

why doesn't "gcc -lfoo" (ld) find /usr/local/lib/foo.dll?
what do I do to avoid this?
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RE: why is -L/usr/local/lib necessary?

[Chris January]

> why doesn't "gcc -lfoo" (ld) find /usr/local/lib/foo.dll?
> what do I do to avoid this?

Edit /usr/lib/gcc-lib/i686-pc-cygwin/3.3.3/specs 

Chris


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RE: why is -L/usr/local/lib necessary?

[Dave Korn]

> -----Original Message-----
> From: cygwin-owner On Behalf Of Sam Steingold
> Sent: 14 December 2004 17:02

> Subject: why is -L/usr/local/lib necessary?
> 
> why doesn't "gcc -lfoo" (ld) find /usr/local/lib/foo.dll?

Two reasons:

1)  It won't look in /usr/local/lib by default.  "gcc -print-search-dirs" should
clarify this for you, or "gcc -v -lfoo", which shows you the exact command line
used to invoke ld.

2)  You can't statically link against a .dll anyway.  You statically link (at
compile time) against .a files; you dynamically link (at runtime) against .dll
files.

> what do I do to avoid this?

  Don't write a program that needs to link against libfoo?

  Look, you have only two choices.  Either put your libs in the default search
path, or specify the path.  It's not unreasonable that gcc can't magically guess
where you've hidden them.

    cheers, 
      DaveK
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RE: why is -L/usr/local/lib necessary?

[Dave Korn]

> -----Original Message-----
> From: cygwin-owner On Behalf Of Dave Korn
> Sent: 14 December 2004 17:28


> 2)  You can't statically link against a .dll anyway.  You 
> statically link (at
> compile time) against .a files; you dynamically link (at 
> runtime) against .dll files.

  Minor correction:  you can in fact link against a dll, but it doesn't actually
link the function from the dll into your exe, it links a __imp__FunctioName
stub.  So it's the same as linking against the corresponding static import
library (libfoo.dll.a in this case) anyway.

    cheers, 
      DaveK
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Re: why is -L/usr/local/lib necessary?

[Sam Steingold]

> * Dave Korn <qnir.xbea@negvzv.pbz> [2004-12-14 17:27:37 +0000]:
>
> Look, you have only two choices.  Either put your libs in the default
> search path, or specify the path.  It's not unreasonable that gcc
> can't magically guess where you've hidden them.

I agree, with a minor additions:

1. /usr/local/lib/ is a fairly standard location, and it appears that
   gcc and ld.so on linux are aware of it.
   I see no good reason for cygwin to ignore it.

2. linux has /etc/ld.so.conf where I can put my "hidden" directories so
   that I do not have to put them in the command line.
   is there a similarly magical file on cygwin?

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RE: why is -L/usr/local/lib necessary?

[Andrew Schulman]

> > why doesn't "gcc -lfoo" (ld) find /usr/local/lib/foo.dll?
> > what do I do to avoid this?
> 
> Edit /usr/lib/gcc-lib/i686-pc-cygwin/3.3.3/specs 

Geez, that thing should be in /etc.

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RE: why is -L/usr/local/lib necessary?

[Dave Korn]

> -----Original Message-----
> From: cygwin-owner On Behalf Of Andrew Schulman
> Sent: 14 December 2004 19:53

> > > why doesn't "gcc -lfoo" (ld) find /usr/local/lib/foo.dll?
> > > what do I do to avoid this?
> > 
> > Edit /usr/lib/gcc-lib/i686-pc-cygwin/3.3.3/specs 
> 
> Geez, that thing should be in /etc.

  Actually it should not in general be edited or tampered with whatsoever.  Mess
up with the order of system and installation-local paths and you risk breaking
all sorts of build scripts.

    cheers, 
      DaveK
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Re: why is -L/usr/local/lib necessary?

[Sam Steingold]

> * Chris January <puevf@ngbzvpr.arg> [2004-12-14 17:28:55 +0000]:
>
>> why doesn't "gcc -lfoo" (ld) find /usr/local/lib/foo.dll?
>> what do I do to avoid this?
>
> Edit /usr/lib/gcc-lib/i686-pc-cygwin/3.3.3/specs 

how?
(and will the executable run - or do I need to add /usr/local/lib/ to PATH)

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