[Mesa-dev] [PATCH] automake: Honor (GL|GLU|OSMESA)_LIB from environment

[Brad King]

Teach 'configure' to read the default GL_LIB, GLU_LIB, and OSMESA_LIB
values from the environment.  This allows one to mangle the library
names (without also mangling the symbol names) to make them distinct
from other GL libraries on the system.
---

On 06/01/2012 10:06 AM, Brian Paul wrote:
> You should transition to using autoconf

One feature I used in the pure-make build system was to create a custom
configs/current to set GL_LIB, GLU_LIB, and OSMESA_LIB to have a "Mesa"
prefix.  This helps ensure that VTK both builds and runs against my
nightly Mesa build regardless of what other "GL" libraries appear in
the dynamic loader's search path.  With this patch I can run

 $ GL_LIB=MesaGL GLU_LIB=MesaGLU OSMESA_LIB=MesaOSMesa ./autogen.sh ...

to build with custom library names.  Please review.

Thanks,
-Brad

 configure.ac |   17 ++++++++++-------
 1 file changed, 10 insertions(+), 7 deletions(-)

diff --git a/configure.ac b/configure.ac
index 9fb8149..7f6ba96 100644
--- a/configure.ac
+++ b/configure.ac
@@ -355,6 +355,12 @@ else
         LIB_EXTENSION='so' ;;
     esac
 fi
+AC_ARG_VAR([GL_LIB],[name of GL library @<:@default=GL@:>@])
+AC_ARG_VAR([GLU_LIB],[name of GLU library @<:@default=GLU@:>@])
+AC_ARG_VAR([OSMESA_LIB],[name of OSMesa library @<:@default=OSMesa@:>@])
+GL_LIB="${GL_LIB-GL}"
+GLU_LIB="${GLU_LIB-GLU}"
+OSMESA_LIB="${OSMESA_LIB-OSMesa}"
 
 dnl
 dnl Mangled Mesa support
@@ -365,19 +371,16 @@ AC_ARG_ENABLE([mangling],
   [enable_mangling="${enableval}"],
   [enable_mangling=no]
 )
-GL_LIB="GL"
-GLU_LIB="GLU"
-OSMESA_LIB="OSMesa"
 if test "x${enable_mangling}" = "xyes" ; then
   DEFINES="${DEFINES} -DUSE_MGL_NAMESPACE"
-  GL_LIB="MangledGL"
-  GLU_LIB="MangledGLU"
-  OSMESA_LIB="MangledOSMesa"
+  GL_LIB="Mangled${GL_LIB}"
+  GLU_LIB="Mangled${GLU_LIB}"
+  OSMESA_LIB="Mangled${OSMESA_LIB}"
 fi
 AC_SUBST([GL_LIB])
 AC_SUBST([GLU_LIB])
 AC_SUBST([OSMESA_LIB])
-AM_CONDITIONAL(HAVE_MANGLED_GL, test $GL_LIB = MangledGL)
+AM_CONDITIONAL(HAVE_MANGLED_GL, test "x${enable_mangling}" = "xyes")
 
 dnl
 dnl potentially-infringing-but-nobody-knows-for-sure stuff
-- 
1.7.10