LDFLAGS and CPPFLAGS on OpenLDAP

LuisO · 07-14-2020, 05:57 AM

Hello,

I am compiling OpenLDAP.

I opened "./configure --help" , and among the options I read the "LDFLAGS" and "CPPFLAGS" but they are not explained there. When I looked it up on other compilation samples, I see different paths to those, like:

LDFLAGS="-L/usr/lib64/sasl2" but also "-L/usr/local/lib"

The same goes for "CPPFLAGS"

So, I am confused as to what those flags must contain.

Thanks in advance!

bathory · 07-14-2020, 12:04 PM

Quote:

Originally Posted by LuisO

Hello,

I am compiling OpenLDAP.

I opened "./configure --help" , and among the options I read the "LDFLAGS" and "CPPFLAGS" but they are not explained there. When I looked it up on other compilation samples, I see different paths to those, like:

LDFLAGS="-L/usr/lib64/sasl2" but also "-L/usr/local/lib"

The same goes for "CPPFLAGS"

So, I am confused as to what those flags must contain.

Thanks in advance!

Running "./configure --help" gives:

Code:

./configure --help
<snip>
  LDFLAGS     linker flags, e.g. -L<lib dir> if you have libraries in a
              nonstandard directory <lib dir>
  CPPFLAGS    (Objective) C/C++ preprocessor flags, e.g. -I<include dir> if
              you have headers in a nonstandard directory <include dir>

Meaning that you'll need LDFLAGS/CPPFLAGS only if you are compiling openldap against s/w that is not installed in the standard places (usually under /usr).
This could happen if you're not using official packages, so the compiler cannot find the needed libraries in /usr/lib and/or /usr/lib64 and the header files in /usr/include

Also note that if you want to compile s/w from sources, you'll need to use your package manager in order to install the development packages of core stuff.

LuisO · 07-23-2020, 05:07 AM

Quote:

Originally Posted by bathory

Running "./configure --help" gives:

Code:

./configure --help
<snip>
  LDFLAGS     linker flags, e.g. -L<lib dir> if you have libraries in a
              nonstandard directory <lib dir>
  CPPFLAGS    (Objective) C/C++ preprocessor flags, e.g. -I<include dir> if
              you have headers in a nonstandard directory <include dir>

Meaning that you'll need LDFLAGS/CPPFLAGS only if you are compiling openldap against s/w that is not installed in the standard places (usually under /usr).
This could happen if you're not using official packages, so the compiler cannot find the needed libraries in /usr/lib and/or /usr/lib64 and the header files in /usr/include

Also note that if you want to compile s/w from sources, you'll need to use your package manager in order to install the development packages of core stuff.

What does "s/w" mean?

Also, I have installed it under "/app" , a newly created directory.

So I am guessing I need those two flags?

( I am newish to OpenLDAP )

bathory · 07-23-2020, 06:29 AM

Quote:

What does "s/w" mean?

Means software...

Quote:

Also, I have installed it under "/app" , a newly created directory.

So I am guessing I need those two flags?

( I am newish to OpenLDAP )

You don't understand the usage of those 2 env. variables.
You'll need to define them when you're compiling openldap, if you have installed any of its dependencies under a non standard directory.

If you have installed openldap in /app, then it should work fine, because it already found its dependencies in the standard directories.

However, if later on you're going to compile some other software that depends on openldap, then you'll have to define those 2 variables in that software's ./configure script.

I hope it's clear now
Regards

LuisO · 07-30-2020, 02:09 AM

Quote:

Originally Posted by bathory

Means software...

You don't understand the usage of those 2 env. variables.
You'll need to define them when you're compiling openldap, if you have installed any of its dependencies under a non standard directory.

If you have installed openldap in /app, then it should work fine, because it already found its dependencies in the standard directories.

However, if later on you're going to compile some other software that depends on openldap, then you'll have to define those 2 variables in that software's ./configure script.

I hope it's clear now
Regards

I find it difficult to understand, to be honest, but it is really my fault. I am new to OpenLDAP.

Anyway I really appreciate your effort !