omnibus: lmdb: allow overriding build/install environment & use commo…

…n env/flags

This allows us to just `make install` instead of manually copying every files
around. It also allows for modifying the compiler we use
We can now also modify the build environment if needed

omnibus/config/patches/lmdb/allow-makefile-override-vars.diff

@@ -0,0 +1,22 @@
+--- a/Makefile	2023-12-06 12:09:29.871461460 +0100
++++ b/Makefile	2023-12-06 12:10:29.907352846 +0100
+@@ -18,16 +18,16 @@
+ # There may be other macros in mdb.c of interest. You should
+ # read mdb.c before changing any of them.
+ #
+-CC	= gcc
+-AR	= ar
++CC	?= gcc
++AR	?= ar
+ W	= -W -Wall -Wno-unused-parameter -Wbad-function-cast -Wuninitialized
+ THREADS = -pthread
+ OPT = -O2 -g
+ CFLAGS	= $(THREADS) $(OPT) $(W) $(XCFLAGS)
+ LDLIBS	=
+ SOLIBS	=
+ SOEXT	= .so
+-prefix	= /usr/local
++prefix	?= /usr/local
+ exec_prefix = $(prefix)
+ bindir = $(exec_prefix)/bin
+ libdir = $(exec_prefix)/lib

omnibus/config/software/lmdb.rb

@@ -10,11 +10,10 @@
 build do
     license "OpenLDAP Public License"
     license_file "https://raw.githubusercontent.com/LMDB/lmdb/LMDB_#{version}/libraries/liblmdb/COPYRIGHT"
-    env = {
-        "LDFLAGS" => "-L#{install_dir}/embedded/lib -I#{install_dir}/embedded/include",
-        "CFLAGS" => "-L#{install_dir}/embedded/lib -I#{install_dir}/embedded/include",
-        "LD_RUN_PATH" => "#{install_dir}/embedded/lib",
-    }
+    patch source: "allow-makefile-override-vars.diff"
+    env = with_standard_compiler_flags(with_embedded_path)
+    env["prefix"] = "#{install_dir}/embedded/"
+    env["XCFLAGS"] = env["CFLAGS"]
 
     # https://www.linuxfromscratch.org/blfs/view/8.3/server/lmdb.html
     command "make -j #{workers}", :env => env
@@ -24,13 +23,6 @@
     else
         command "sed -i 's| liblmdb.a||' Makefile", :env => env
     end
-
-    # We have to manually move the files into the correct directories because the Makefile for lmdb hardcodes the install directory to `/usr/local`, although we need this to be `#{install_dir}/embedded`
-    copy "liblmdb.so", "#{install_dir}/embedded/lib/liblmdb.so"
-    copy "lmdb.h", "#{install_dir}/embedded/include/lmdb.h"
-    copy "mdb_stat", "#{install_dir}/embedded/bin/mdb_stat"
-    copy "mdb_copy", "#{install_dir}/embedded/bin/mdb_copy"
-    copy "mdb_dump", "#{install_dir}/embedded/bin/mdb_dump"
-    copy "mdb_load", "#{install_dir}/embedded/bin/mdb_load"
+    command "make install", :env => env
 
 end