Configure - get rid of the special debug_ and release_ settings

Instead, make the build type ("debug" or "release") available through
$config{build_type} and let the configs themselves figure out what the
usual settings (such as "cflags", "lflags" and so on) should be
accordingly.

The benefit with this is that we can now have debug and release
variants of any setting, not just those Configure supports, and may
also involve other factors (the MSVC flags /MD[d] and /MT[d] involve
both build type and whether threading is enabled or not)

Reviewed-by: Andy Polyakov <appro@openssl.org>

3 files changed, 166 insertions, 157 deletions

diff --git a/Configurations/00-base-templates.conf b/Configurations/00-base-templates.conf
index 60cd90e..161eb39 100644
--- a/Configurations/00-base-templates.conf
+++ b/Configurations/00-base-templates.conf
@@ -5,10 +5,6 @@
 
 	cflags		=> "",
 	defines		=> [],
-	debug_cflags	=> "",
-	debug_defines	=> [],
-	release_cflags	=> "",
-	release_defines => [],
 	thread_cflags	=> "",
 	thread_defines	=> [],
 
diff --git a/Configurations/10-main.conf b/Configurations/10-main.conf
index 3b90403..121815f 100644
--- a/Configurations/10-main.conf
+++ b/Configurations/10-main.conf
@@ -1,14 +1,19 @@
 ## -*- mode: perl; -*-
 ## Standard openssl configuration targets.
 
+sub picker {
+    my %opts = @_;
+    return sub { add($opts{default} || (),
+                     $opts{$config{build_type}} || ())->(); }
+}
+
 %targets = (
 
 #### Basic configs that should work on any 32-bit box
     "gcc" => {
         cc               => "gcc",
-        cflags           => "",
-        debug_cflags     => "-O0 -g",
-        release_cflags   => "-O3",
+        cflags           => picker(debug   => "-O0 -g",
+                                   release => "-O3"),
         thread_cflag     => "(unknown)",
         bn_ops           => "BN_LLONG",
     },
@@ -22,9 +27,9 @@
     "vos-gcc" => {
         inherit_from     => [ "BASE_unix" ],
         cc               => "gcc",
-        cflags           => "-Wall -DOPENSSL_SYS_VOS -D_POSIX_C_SOURCE=200112L -D_BSD -D_VOS_EXTENDED_NAMES -DB_ENDIAN",
-        debug_cflags     => "-O0 -g -DBN_DEBUG -DREF_DEBUG -DCONF_DEBUG",
-        release_cflags   => "-O3",
+        cflags           => picker(default => "-Wall -DOPENSSL_SYS_VOS -D_POSIX_C_SOURCE=200112L -D_BSD -D_VOS_EXTENDED_NAMES -DB_ENDIAN",
+                                   debug   => "-O0 -g -DBN_DEBUG -DREF_DEBUG -DCONF_DEBUG",
+                                   release => "-O3"),
         thread_cflag     => "(unknown)",
         sys_id           => "VOS",
         lflags           => "-Wl,-map",
@@ -51,9 +56,9 @@
         # with "Illegal mnemonic" error message.
         inherit_from     => [ "solaris-common", asm("x86_elf_asm") ],
         cc               => "gcc",
-        cflags           => add_before("-Wall -DL_ENDIAN -DOPENSSL_NO_INLINE_ASM"),
-        debug_cflags     => "-O0 -g",
-        release_cflags   => "-O3 -fomit-frame-pointer",
+        cflags           => add_before(picker(default => "-Wall -DL_ENDIAN -DOPENSSL_NO_INLINE_ASM",
+                                              debug   => "-O0 -g",
+                                              release => "-O3 -fomit-frame-pointer")),
         thread_cflag     => "-pthread",
         bn_ops           => "BN_LLONG",
         shared_cflag     => "-fPIC",
@@ -70,9 +75,9 @@
         #					<appro@fy.chalmers.se>
         inherit_from     => [ "solaris-common", asm("x86_64_asm") ],
         cc               => "gcc",
-        cflags           => add_before("-m64 -Wall -DL_ENDIAN"),
-        debug_cflags     => "-O0 -g",
-        release_cflags   => "-O3",
+        cflags           => add_before(picker(default => "-m64 -Wall -DL_ENDIAN",
+                                              debug   => "-O0 -g",
+                                              release => "-O3")),
         thread_cflag     => "-pthread",
         bn_ops           => "SIXTY_FOUR_BIT_LONG",
         perlasm_scheme   => "elf",
@@ -85,9 +90,9 @@
     "solaris-x86-cc" => {
         inherit_from     => [ "solaris-common" ],
         cc               => "cc",
-        cflags           => add_before("-xarch=generic -xstrconst -Xa -DL_ENDIAN"),
-        debug_cflags     => "-g",
-        release_cflags   => "-xO5 -xregs=frameptr -xdepend -xbuiltin",
+        cflags           => add_before(picker(default => "-xarch=generic -xstrconst -Xa -DL_ENDIAN",
+                                              debug   => "-g",
+                                              release => "-xO5 -xregs=frameptr -xdepend -xbuiltin")),
         thread_cflag     => "-D_REENTRANT",
         lflags           => add("-mt"),
         ex_libs          => add("-lpthread"),
@@ -98,9 +103,9 @@
     "solaris64-x86_64-cc" => {
         inherit_from     => [ "solaris-common", asm("x86_64_asm") ],
         cc               => "cc",
-        cflags           => add_before("-xarch=generic64 -xstrconst -Xa -DL_ENDIAN"),
-        debug_cflags     => "-g",
-        release_cflags   => "-xO5 -xdepend -xbuiltin",
+        cflags           => add_before(picker(default => "-xarch=generic64 -xstrconst -Xa -DL_ENDIAN",
+                                              debug   => "-g",
+                                              release => "-xO5 -xdepend -xbuiltin")),
         thread_cflag     => "-D_REENTRANT",
         lflags           => add("-mt"),
         ex_libs          => add("-lpthread"),
@@ -115,9 +120,9 @@
     "solaris-sparcv7-gcc" => {
         inherit_from     => [ "solaris-common" ],
         cc               => "gcc",
-        cflags           => add_before("-Wall -DB_ENDIAN -DBN_DIV2W"),
-        debug_cflags     => "-O0 -g",
-        release_cflags   => "-O3",
+        cflags           => add_before(picker(default => "-Wall -DB_ENDIAN -DBN_DIV2W",
+                                              debug   => "-O0 -g",
+                                              release => "-O3")),
         thread_cflag     => "-pthread",
         bn_ops           => "BN_LLONG RC4_CHAR",
         shared_cflag     => "-fPIC",
@@ -131,8 +136,8 @@
         # -m32 should be safe to add as long as driver recognizes
         # -mcpu=ultrasparc
         inherit_from     => [ "solaris-sparcv7-gcc", asm("sparcv9_asm") ],
-        cflags           => add_before("-m32 -mcpu=ultrasparc"),
-        debug_cflags     => "-DBN_DEBUG -DREF_DEBUG -DCONF_DEBUG -DBN_CTX_DEBUG -DPEDANTIC -O -g -pedantic -ansi -Wshadow -Wno-long-long -D__EXTENSIONS__",
+        cflags           => add_before(picker(default => "-m32 -mcpu=ultrasparc",
+                                              debug   => "-DBN_DEBUG -DREF_DEBUG -DCONF_DEBUG -DBN_CTX_DEBUG -DPEDANTIC -O -g -pedantic -ansi -Wshadow -Wno-long-long -D__EXTENSIONS__")),
     },
     "solaris64-sparcv9-gcc" => {
         inherit_from     => [ "solaris-sparcv9-gcc" ],
@@ -149,9 +154,9 @@
     "solaris-sparcv7-cc" => {
         inherit_from     => [ "solaris-common" ],
         cc               => "cc",
-        cflags           => add_before("-xstrconst -Xa -DB_ENDIAN -DBN_DIV2W"),
-        debug_cflags     => "-g -DBN_DEBUG -DREF_DEBUG -DCONF_DEBUG -DBN_CTX_DEBUG",
-        release_cflags   => "-xO5 -xdepend",
+        cflags           => add_before(picker(default => "-xstrconst -Xa -DB_ENDIAN -DBN_DIV2W",
+                                              debug   => "-g -DBN_DEBUG -DREF_DEBUG -DCONF_DEBUG -DBN_CTX_DEBUG",
+                                              release => "-xO5 -xdepend")),
         thread_cflag     => "-D_REENTRANT",
         lflags           => add("-mt"),
         ex_libs          => add("-lpthread"),
@@ -181,9 +186,9 @@
     "irix-gcc" => {
         inherit_from     => [ "BASE_unix", asm("mips32_asm") ],
         cc               => "gcc",
-        cflags           => "-DB_ENDIAN",
-        debug_cflags     => "-g -O0",
-        release_cflags   => "-O3",
+        cflags           => picker(default => "-DB_ENDIAN",
+                                   debug   => "-g -O0",
+                                   release => "-O3"),
         thread_cflag     => "(unknown)",
         bn_ops           => "BN_LLONG RC4_CHAR",
         perlasm_scheme   => "o32",
@@ -194,9 +199,9 @@
     "irix-cc" => {
         inherit_from     => [ "BASE_unix", asm("mips32_asm") ],
         cc               => "cc",
-        cflags           => "-use_readonly_const -DB_ENDIAN",
-        debug_cflags     => "-g -O0",
-        release_cflags   => "-O2",
+        cflags           => picker(default => "-use_readonly_const -DB_ENDIAN",
+                                   debug   => "-g -O0",
+                                   release => "-O2"),
         thread_cflag     => "(unknown)",
         bn_ops           => "BN_LLONG RC4_CHAR",
         perlasm_scheme   => "o32",
@@ -210,9 +215,9 @@
     "irix-mips3-gcc" => {
         inherit_from     => [ "BASE_unix", asm("mips64_asm") ],
         cc               => "gcc",
-        cflags           => "-mabi=n32 -DB_ENDIAN -DBN_DIV3W",
-        debug_cflags     => "-g -O0",
-        release_cflags   => "-O3",
+        cflags           => picker(default => "-mabi=n32 -DB_ENDIAN -DBN_DIV3W",
+                                   debug   => "-g -O0",
+                                   release => "-O3"),
         thread_cflag     => "-D_SGI_MP_SOURCE -pthread",
         bn_ops           => "RC4_CHAR SIXTY_FOUR_BIT",
         perlasm_scheme   => "n32",
@@ -225,9 +230,9 @@
     "irix-mips3-cc" => {
         inherit_from     => [ "BASE_unix", asm("mips64_asm") ],
         cc               => "cc",
-        cflags           => "-n32 -mips3 -use_readonly_const -G0 -rdata_shared -DB_ENDIAN -DBN_DIV3W",
-        debug_cflags     => "-g -O0",
-        release_cflags   => "-O2",
+        cflags           => picker(default => "-n32 -mips3 -use_readonly_const -G0 -rdata_shared -DB_ENDIAN -DBN_DIV3W",
+                                   debug   => "-g -O0",
+                                   release => "-O2"),
         thread_cflag     => "-D_SGI_MP_SOURCE",
         ex_libs          => add("-lpthread"),
         bn_ops           => "RC4_CHAR SIXTY_FOUR_BIT",
@@ -242,9 +247,9 @@
     "irix64-mips4-gcc" => {
         inherit_from     => [ "BASE_unix", asm("mips64_asm") ],
         cc               => "gcc",
-        cflags           => "-mabi=64 -mips4 -DB_ENDIAN -DBN_DIV3W",
-        debug_cflags     => "-g -O0",
-        release_cflags   => "-O3",
+        cflags           => picker(default => "-mabi=64 -mips4 -DB_ENDIAN -DBN_DIV3W",
+                                   debug   => "-g -O0",
+                                   release => "-O3"),
         thread_cflag     => "-D_SGI_MP_SOURCE",
         bn_ops           => "RC4_CHAR SIXTY_FOUR_BIT_LONG",
         perlasm_scheme   => "64",
@@ -257,9 +262,9 @@
     "irix64-mips4-cc" => {
         inherit_from     => [ "BASE_unix", asm("mips64_asm") ],
         cc               => "cc",
-        cflags           => "-64 -mips4 -use_readonly_const -G0 -rdata_shared -DB_ENDIAN -DBN_DIV3W",
-        debug_cflags     => "-g -O0",
-        release_cflags   => "-O2",
+        cflags           => picker(default => "-64 -mips4 -use_readonly_const -G0 -rdata_shared -DB_ENDIAN -DBN_DIV3W",
+                                   debug   => "-g -O0",
+                                   release => "-O2"),
         thread_cflag     => "-D_SGI_MP_SOURCE",
         ex_libs          => add("-lpthread"),
         bn_ops           => "RC4_CHAR SIXTY_FOUR_BIT_LONG",
@@ -302,9 +307,9 @@
     "hpux-parisc-gcc" => {
         inherit_from     => [ "BASE_unix" ],
         cc               => "gcc",
-        cflags           => "-DB_ENDIAN -DBN_DIV2W",
-        debug_cflags     => "-O0 -g",
-        release_cflags   => "-O3",
+        cflags           => picker(default => "-DB_ENDIAN -DBN_DIV2W",
+                                   debug   => "-O0 -g",
+                                   release => "-O3"),
         thread_cflag     => "-pthread",
         ex_libs          => add("-Wl,+s -ldld"),
         bn_ops           => "BN_LLONG",
@@ -321,9 +326,9 @@
     "hpux64-parisc2-gcc" => {
         inherit_from     => [ "BASE_unix", asm("parisc20_64_asm") ],
         cc               => "gcc",
-        cflags           => "-DB_ENDIAN",
-        debug_cflags     => "-O0 -g",
-        release_cflags   => "-O3",
+        cflags           => picker(default => "-DB_ENDIAN",
+                                   debug   => "-O0 -g",
+                                   release => "-O3"),
         thread_cflag     => "-D_REENTRANT",
         ex_libs          => add("-ldl"),
         bn_ops           => "SIXTY_FOUR_BIT_LONG RC4_CHAR",
@@ -342,9 +347,9 @@
     "hpux-parisc-cc" => {
         inherit_from     => [ "BASE_unix" ],
         cc               => "cc",
-        cflags           => "+Optrs_strongly_typed -Ae +ESlit -DB_ENDIAN -DBN_DIV2W -DMD32_XARRAY",
-        debug_cflags      => "+O0 +d -g",
-        release_cflags   => "+O3",
+        cflags           => picker(default => "+Optrs_strongly_typed -Ae +ESlit -DB_ENDIAN -DBN_DIV2W -DMD32_XARRAY",
+                                   debug   => "+O0 +d -g",
+                                   release => "+O3"),
         thread_cflag     => "-D_REENTRANT",
         ex_libs          => add("-Wl,+s -ldld -lpthread"),
         bn_ops           => "RC4_CHAR",
@@ -362,9 +367,9 @@
     "hpux64-parisc2-cc" => {
         inherit_from     => [ "BASE_unix", asm("parisc20_64_asm") ],
         cc               => "cc",
-        cflags           => "+DD64 +Optrs_strongly_typed -Ae +ESlit -DB_ENDIAN -DMD32_XARRAY",
-        debug_cflags      => "+O0 +d -g",
-        release_cflags   => "+O3",
+        cflags           => picker(default => "+DD64 +Optrs_strongly_typed -Ae +ESlit -DB_ENDIAN -DMD32_XARRAY",
+                                   debug   => "+O0 +d -g",
+                                   release => "+O3"),
         thread_cflag     => "-D_REENTRANT",
         ex_libs          => add("-ldl -lpthread"),
         bn_ops           => "SIXTY_FOUR_BIT_LONG RC4_CHAR",
@@ -380,9 +385,9 @@
     "hpux-ia64-cc" => {
         inherit_from     => [ "BASE_unix", asm("ia64_asm") ],
         cc               => "cc",
-        cflags           => "-Ae +DD32 +Olit=all -z -DB_ENDIAN",
-        debug_cflags     => "+O0 +d -g",
-        release_cflags   => "+O2",
+        cflags           => picker(default => "-Ae +DD32 +Olit=all -z -DB_ENDIAN",
+                                   debug   => "+O0 +d -g",
+                                   release => "+O2"),
         thread_cflag     => "-D_REENTRANT",
         ex_libs          => add("-ldl -lpthread"),
         bn_ops           => "SIXTY_FOUR_BIT",
@@ -398,9 +403,9 @@
     "hpux64-ia64-cc" => {
         inherit_from     => [ "BASE_unix", asm("ia64_asm") ],
         cc               => "cc",
-        cflags           => "-Ae +DD64 +Olit=all -z -DB_ENDIAN",
-        debug_cflags     => "+O0 +d -g",
-        release_cflags   => "+O3",
+        cflags           => picker(default => "-Ae +DD64 +Olit=all -z -DB_ENDIAN",
+                                   debug   => "+O0 +d -g",
+                                   release => "+O3"),
         thread_cflag     => "-D_REENTRANT",
         ex_libs          => add("-ldl -lpthread"),
         bn_ops           => "SIXTY_FOUR_BIT_LONG",
@@ -415,9 +420,9 @@
     "hpux-ia64-gcc" => {
         inherit_from     => [ "BASE_unix", asm("ia64_asm") ],
         cc               => "gcc",
-        cflags           => "-DB_ENDIAN",
-        debug_cflags     => "-O0 -g",
-        release_cflags   => "-O3",
+        cflags           => picker(default => "-DB_ENDIAN",
+                                   debug   => "-O0 -g",
+                                   release => "-O3"),
         thread_cflag     => "-pthread",
         ex_libs          => add("-ldl"),
         bn_ops           => "SIXTY_FOUR_BIT",
@@ -431,9 +436,9 @@
     "hpux64-ia64-gcc" => {
         inherit_from     => [ "BASE_unix", asm("ia64_asm") ],
         cc               => "gcc",
-        cflags           => "-mlp64 -DB_ENDIAN",
-        debug_cflags     => "-O0 -g",
-        release_cflags   => "-O3",
+        cflags           => picker(default => "-mlp64 -DB_ENDIAN",
+                                   debug   => "-O0 -g",
+                                   release => "-O3"),
         thread_cflag     => "-pthread",
         ex_libs          => add("-ldl"),
         bn_ops           => "SIXTY_FOUR_BIT_LONG",
@@ -497,9 +502,9 @@
     "linux-generic32" => {
         inherit_from     => [ "BASE_unix" ],
         cc               => "gcc",
-        cflags           => "-Wall",
-        debug_cflags     => "-O0 -g -DBN_DEBUG -DREF_DEBUG -DCONF_DEBUG",
-        release_cflags   => "-O3",
+        cflags           => picker(default => "-Wall",
+                                   debug   => "-O0 -g -DBN_DEBUG -DREF_DEBUG -DCONF_DEBUG",
+                                   release => "-O3"),
         thread_cflag     => "-pthread",
         ex_libs          => add("-ldl"),
         bn_ops           => "BN_LLONG RC4_CHAR",
@@ -519,14 +524,14 @@
     },
     "linux-ppc64" => {
         inherit_from     => [ "linux-generic64", asm("ppc64_asm") ],
-        cflags           => "-m64 -Wall -DB_ENDIAN",
+        cflags           => add("-m64 -DB_ENDIAN"),
         perlasm_scheme   => "linux64",
         shared_ldflag    => "-m64",
         multilib         => "64",
     },
     "linux-ppc64le" => {
         inherit_from     => [ "linux-generic64", asm("ppc64_asm") ],
-        cflags           => "-m64 -Wall -DL_ENDIAN",
+        cflags           => add("-m64 -DL_ENDIAN"),
         perlasm_scheme   => "linux64le",
         shared_ldflag    => "-m64",
     },
@@ -572,7 +577,7 @@
     },
     "linux-arm64ilp32" => {  # https://wiki.linaro.org/Platform/arm64-ilp32
         inherit_from     => [ "linux-generic32", asm("aarch64_asm") ],
-        cflags           => "-mabi=ilp32 -Wall",
+        cflags           => add("-mabi=ilp32"),
         bn_ops           => "SIXTY_FOUR_BIT RC4_CHAR",
         perlasm_scheme   => "linux64",
         shared_ldflag    => "-mabi=ilp32",
@@ -582,7 +587,7 @@
         # Configure script adds minimally required -march for assembly
         # support, if no -march was specified at command line.
         inherit_from     => [ "linux-generic32", asm("mips32_asm") ],
-        cflags           => "-mabi=32 -Wall -DBN_DIV3W",
+        cflags           => add("-mabi=32 -DBN_DIV3W"),
         perlasm_scheme   => "o32",
         shared_ldflag    => "-mabi=32",
     },
@@ -590,7 +595,7 @@
     # specifications, MIPS32 and MIPS64, rather than to kernel bitness.
     "linux-mips64" => {
         inherit_from     => [ "linux-generic32", asm("mips64_asm") ],
-        cflags           => "-mabi=n32 -Wall -DBN_DIV3W",
+        cflags           => add("-mabi=n32 -DBN_DIV3W"),
         bn_ops           => "SIXTY_FOUR_BIT RC4_CHAR",
         perlasm_scheme   => "n32",
         shared_ldflag    => "-mabi=n32",
@@ -598,7 +603,7 @@
     },
     "linux64-mips64" => {
         inherit_from     => [ "linux-generic64", asm("mips64_asm") ],
-        cflags           => "-mabi=64 -O3 -Wall -DBN_DIV3W",
+        cflags           => add("-mabi=64 -DBN_DIV3W"),
         perlasm_scheme   => "64",
         shared_ldflag    => "-mabi=64",
         multilib         => "64",
@@ -607,19 +612,17 @@
     #### IA-32 targets...
     "linux-elf" => {
         inherit_from     => [ "linux-generic32", asm("x86_elf_asm") ],
-        cc               => "gcc",
-        cflags           => "-DL_ENDIAN -Wall",
-        debug_cflags     => "-O0 -g -DBN_DEBUG -DREF_DEBUG -DCONF_DEBUG -DBN_CTX_DEBUG",
-        release_cflags   => "-O3 -fomit-frame-pointer",
-        debug_ex_libs    => "-lefence",
+        cflags           => add(picker(default => "-DL_ENDIAN",
+                                       release => "-fomit-frame-pointer")),
+        ex_libs          => add(picker(debug => "-lefence")),
         bn_ops           => "BN_LLONG",
     },
     "linux-aout" => {
         inherit_from     => [ "BASE_unix", asm("x86_asm") ],
         cc               => "gcc",
-        cflags           => "-DL_ENDIAN -Wall",
-        debug_cflags     => "-O0 -g",
-        release_cflags   => "-O3 -fomit-frame-pointer",
+        cflags           => add(picker(default => "-DL_ENDIAN -Wall",
+                                       debug   => "-O0 -g",
+                                       release => "-O3 -fomit-frame-pointer")),
         thread_cflag     => "(unknown)",
         bn_ops           => "BN_LLONG",
         perlasm_scheme   => "a.out",
@@ -627,7 +630,7 @@
 
     "linux-x86_64" => {
         inherit_from     => [ "linux-generic64", asm("x86_64_asm") ],
-        cflags           => "-m64 -DL_ENDIAN -Wall",
+        cflags           => add("-m64 -DL_ENDIAN"),
         bn_ops           => "SIXTY_FOUR_BIT_LONG",
         perlasm_scheme   => "elf",
         shared_ldflag    => "-m64",
@@ -636,11 +639,11 @@
     "linux-x86_64-clang" => {
         inherit_from     => [ "linux-x86_64" ],
         cc               => "clang",
-        cflags           => "-m64 -DL_ENDIAN -Wall -Wextra -Qunused-arguments",
+        cflags           => add("-Wextra -Qunused-arguments"),
     },
     "linux-x32" => {
         inherit_from     => [ "linux-generic32", asm("x86_64_asm") ],
-        cflags           => "-mx32 -DL_ENDIAN -Wall",
+        cflags           => add("-mx32 -DL_ENDIAN"),
         bn_ops           => "SIXTY_FOUR_BIT",
         perlasm_scheme   => "elf",
         shared_ldflag    => "-mx32",
@@ -654,7 +657,7 @@
 
     "linux64-s390x" => {
         inherit_from     => [ "linux-generic64", asm("s390x_asm") ],
-        cflags           => "-m64 -Wall -DB_ENDIAN",
+        cflags           => add("-m64 -DB_ENDIAN"),
         perlasm_scheme   => "64",
         shared_ldflag    => "-m64",
         multilib         => "64",
@@ -677,7 +680,7 @@
         # sysdeps/s390/dl-procinfo.c affecting ldconfig and ld.so.1...
         #
         inherit_from     => [ "linux-generic32", asm("s390x_asm") ],
-        cflags           => "-m31 -Wall -Wa,-mzarch -DB_ENDIAN",
+        cflags           => add("-m31 -Wa,-mzarch -DB_ENDIAN"),
         bn_obj           => sub { my $r=join(" ",@_); $r=~s/bn\-s390x/bn_asm/; $r; },
         perlasm_scheme   => "31",
         shared_ldflag    => "-m31",
@@ -689,19 +692,19 @@
     # patiently assisted with debugging of following two configs.
     "linux-sparcv8" => {
         inherit_from     => [ "linux-generic32", asm("sparcv8_asm") ],
-        cflags           => "-mcpu=v8 -Wall -DB_ENDIAN -DBN_DIV2W",
+        cflags           => add("-mcpu=v8 -DB_ENDIAN -DBN_DIV2W"),
     },
     "linux-sparcv9" => {
         # it's a real mess with -mcpu=ultrasparc option under Linux,
         # but -Wa,-Av8plus should do the trick no matter what.
         inherit_from     => [ "linux-generic32", asm("sparcv9_asm") ],
-        cflags           => "-m32 -mcpu=ultrasparc -Wall -Wa,-Av8plus -DB_ENDIAN -DBN_DIV2W",
+        cflags           => add("-m32 -mcpu=ultrasparc -Wa,-Av8plus -DB_ENDIAN -DBN_DIV2W"),
         shared_ldflag    => "-m32",
     },
     "linux64-sparcv9" => {
         # GCC 3.1 is a requirement
         inherit_from     => [ "linux-generic64", asm("sparcv9_asm") ],
-        cflags           => "-m64 -mcpu=ultrasparc -Wall -DB_ENDIAN",
+        cflags           => add("-m64 -mcpu=ultrasparc -DB_ENDIAN"),
         bn_ops           => "BN_LLONG RC4_CHAR",
         shared_ldflag    => "-m64",
         multilib         => "64",
@@ -709,7 +712,7 @@
 
     "linux-alpha-gcc" => {
         inherit_from     => [ "linux-generic64", asm("alpha_asm") ],
-        cflags           => "-DL_ENDIAN",
+        cflags           => add("-DL_ENDIAN"),
         bn_ops           => "SIXTY_FOUR_BIT_LONG",
     },
     "linux-c64xplus" => {
@@ -762,14 +765,15 @@
         # systems are perfectly capable of executing binaries targeting
         # Froyo. Keep in mind that in the nutshell Android builds are
         # about JNI, i.e. shared libraries, not applications.
-        cflags           => "-mandroid -fPIC --sysroot=\$(CROSS_SYSROOT) -Wa,--noexecstack -Wall",
-        debug_cflags     => "-O0 -g",
+        cflags           => picker(default => "-mandroid -fPIC --sysroot=\$(CROSS_SYSROOT) -Wa,--noexecstack -Wall",
+                                   debug   => "-O0 -g",
+                                   release => "-O3"),
         lflags           => "-pie",
         shared_cflag     => "",
     },
     "android-x86" => {
         inherit_from     => [ "android", asm("x86_asm") ],
-        release_cflags   => "-O3 -fomit-frame-pointer",
+        cflags           => add(picker(release => "-fomit-frame-pointer")),
         bn_ops           => "BN_LLONG",
         perlasm_scheme   => "android",
     },
@@ -804,8 +808,9 @@
 
     "android64" => {
         inherit_from     => [ "linux-generic64" ],
-        cflags           => "-mandroid -fPIC --sysroot=\$(CROSS_SYSROOT) -Wa,--noexecstack -Wall",
-        debug_cflags     => "-O0 -g",
+        cflags           => picker(default => "-mandroid -fPIC --sysroot=\$(CROSS_SYSROOT) -Wa,--noexecstack -Wall",
+                                   debug   => "-O0 -g",
+                                   release => "-O3"),
         lflags           => "-pie",
         shared_cflag     => "",
     },
@@ -825,9 +830,9 @@
         # expands it as -lc_r, which seems to be sufficient?
         inherit_from     => [ "BASE_unix" ],
         cc               => "cc",
-        cflags           => "-Wall",
-        debug_cflags     => "-O0 -g",
-        release_cflags   => "-O3",
+        cflags           => picker(default => "-Wall",
+                                   debug   => "-O0 -g",
+                                   release => "-O3"),
         thread_cflag     => "-pthread -D_THREAD_SAFE -D_REENTRANT",
         bn_ops           => "BN_LLONG",
         dso_scheme       => "dlfcn",
@@ -842,8 +847,8 @@
 
     "BSD-x86" => {
         inherit_from     => [ "BSD-generic32", asm("x86_asm") ],
-        cflags           => "-DL_ENDIAN -Wall",
-        release_cflags   => "-O3 -fomit-frame-pointer",
+        cflags           => add(picker(default => "-DL_ENDIAN",
+                                       release => "-fomit-frame-pointer")),
         bn_ops           => "BN_LLONG",
         shared_target    => "bsd-shared",
         perlasm_scheme   => "a.out",
@@ -855,26 +860,26 @@
 
     "BSD-sparcv8" => {
         inherit_from     => [ "BSD-generic32", asm("sparcv8_asm") ],
-        cflags           => "-mcpu=v8 -Wall -DB_ENDIAN",
+        cflags           => add("-mcpu=v8 -DB_ENDIAN"),
     },
     "BSD-sparc64" => {
         # -DMD32_REG_T=int doesn't actually belong in sparc64 target, it
         # simply *happens* to work around a compiler bug in gcc 3.3.3,
         # triggered by RIPEMD160 code.
         inherit_from     => [ "BSD-generic64", asm("sparcv9_asm") ],
-        cflags           => "-DB_ENDIAN -DMD32_REG_T=int -Wall",
+        cflags           => add("-DB_ENDIAN -DMD32_REG_T=int"),
         bn_ops           => "BN_LLONG",
     },
 
     "BSD-ia64" => {
         inherit_from     => [ "BSD-generic64", asm("ia64_asm") ],
-        cflags           => "-DL_ENDIAN -Wall",
+        cflags           => add_before("-DL_ENDIAN"),
         bn_ops           => "SIXTY_FOUR_BIT_LONG",
     },
 
     "BSD-x86_64" => {
         inherit_from     => [ "BSD-generic64", asm("x86_64_asm") ],
-        cflags           => "-DL_ENDIAN -Wall",
+        cflags           => add_before("-DL_ENDIAN"),
         bn_ops           => "SIXTY_FOUR_BIT_LONG",
         perlasm_scheme   => "elf",
     },
@@ -1019,9 +1024,9 @@
     "aix-gcc" => {
         inherit_from     => [ "BASE_unix", asm("ppc32_asm") ],
         cc               => "gcc",
-        cflags           => "-DB_ENDIAN",
-        debug_cflags     => "-O0 -g",
-        release_cflags   => "-O",
+        cflags           => picker(default => "-DB_ENDIAN",
+                                   debug   => "-O0 -g",
+                                   release => "-O"),
         thread_cflag     => "-pthread",
         sys_id           => "AIX",
         bn_ops           => "BN_LLONG RC4_CHAR",
@@ -1035,9 +1040,9 @@
     "aix64-gcc" => {
         inherit_from     => [ "BASE_unix", asm("ppc64_asm") ],
         cc               => "gcc",
-        cflags           => "-maix64 -DB_ENDIAN",
-        debug_cflags     => "-O0 -g",
-        release_cflags   => "-O",
+        cflags           => picker(default => "-maix64 -DB_ENDIAN",
+                                   debug   => "-O0 -g",
+                                   release => "-O"),
         thread_cflag     => "-pthread",
         sys_id           => "AIX",
         bn_ops           => "SIXTY_FOUR_BIT_LONG RC4_CHAR",
@@ -1054,9 +1059,9 @@
     "aix-cc" => {
         inherit_from     => [ "BASE_unix", asm("ppc32_asm") ],
         cc               => "cc",
-        cflags           => "-q32 -DB_ENDIAN -qmaxmem=16384 -qro -qroconst",
-        debug_cflags     => "",
-        release_cflags   => "-O",
+        cflags           => picker(default => "-q32 -DB_ENDIAN -qmaxmem=16384 -qro -qroconst",
+                                   debug   => "-O0 -g",
+                                   release => "-O"),
         thread_cflag     => "-qthreaded -D_THREAD_SAFE",
         sys_id           => "AIX",
         bn_ops           => "BN_LLONG RC4_CHAR",
@@ -1070,9 +1075,9 @@
     "aix64-cc" => {
         inherit_from     => [ "BASE_unix", asm("ppc64_asm") ],
         cc               => "cc",
-        cflags           => "-q64 -DB_ENDIAN -qmaxmem=16384 -qro -qroconst",
-        debug_cflags     => "",
-        release_cflags   => "-O",
+        cflags           => picker(default => "-q64 -DB_ENDIAN -qmaxmem=16384 -qro -qroconst",
+                                   debug   => "-O0 -g",
+                                   release => "-O"),
         thread_cflag     => "-qthreaded -D_THREAD_SAFE",
         sys_id           => "AIX",
         bn_ops           => "SIXTY_FOUR_BIT_LONG RC4_CHAR",
@@ -1174,9 +1179,9 @@
         inherit_from     => [ "BASE_unix", asm("x86_asm"),
                               sub { $disabled{shared} ? () : "x86_uplink" } ],
         cc               => "gcc",
-        cflags           => "-DL_ENDIAN -DWIN32_LEAN_AND_MEAN -DUNICODE -D_UNICODE -m32 -Wall",
-        debug_cflags     => "-g -O0",
-        release_cflags   => "-O3 -fomit-frame-pointer",
+        cflags           => picker(default => "-DL_ENDIAN -DWIN32_LEAN_AND_MEAN -DUNICODE -D_UNICODE -m32 -Wall",
+                                   debug   => "-g -O0",
+                                   release => "-O3 -fomit-frame-pointer"),
         thread_cflag     => "-D_MT",
         sys_id           => "MINGW32",
         ex_libs          => add("-lws2_32 -lgdi32 -lcrypt32"),
@@ -1201,9 +1206,9 @@
         # Applink is never engaged and can as well be omitted.
         inherit_from     => [ "BASE_unix", asm("x86_64_asm") ],
         cc               => "gcc",
-        cflags           => "-DL_ENDIAN -DWIN32_LEAN_AND_MEAN -DUNICODE -D_UNICODE -m64 -Wall",
-        debug_cflags     => "-g -O0",
-        release_cflags   => "-O3",
+        cflags           => picker(default => "-DL_ENDIAN -DWIN32_LEAN_AND_MEAN -DUNICODE -D_UNICODE -m64 -Wall",
+                                   debug   => "-g -O0",
+                                   release => "-O3"),
         thread_cflag     => "-D_MT",
         sys_id           => "MINGW64",
         ex_libs          => add("-lws2_32 -lgdi32 -lcrypt32"),
@@ -1240,9 +1245,9 @@
     "Cygwin-x86" => {
         inherit_from     => [ "BASE_unix", asm("x86_asm") ],
         cc               => "gcc",
-        cflags           => "-DTERMIOS -DL_ENDIAN -Wall",
-        debug_cflags     => "-g -O0",
-        release_cflags   => "-O3 -fomit-frame-pointer",
+        cflags           => picker(default => "-DTERMIOS -DL_ENDIAN -Wall",
+                                   debug   => "-g -O0",
+                                   release => "-O3 -fomit-frame-pointer"),
         sys_id           => "CYGWIN",
         bn_ops           => "BN_LLONG",
         perlasm_scheme   => "coff",
@@ -1255,9 +1260,9 @@
     "Cygwin-x86_64" => {
         inherit_from     => [ "BASE_unix", asm("x86_64_asm") ],
         cc               => "gcc",
-        cflags           => "-DTERMIOS -DL_ENDIAN -Wall",
-        debug_cflags     => "-g -O0",
-        release_cflags   => "-O3",
+        cflags           => picker(default => "-DTERMIOS -DL_ENDIAN -Wall",
+                                   debug   => "-g -O0",
+                                   release => "-O3"),
         sys_id           => "CYGWIN",
         bn_ops           => "SIXTY_FOUR_BIT_LONG",
         perlasm_scheme   => "mingw64",
@@ -1369,9 +1374,9 @@
         inherit_from     => [ "BASE_unix" ],
         template         => 1,
         cc               => "cc",
-        cflags           => "",
-        debug_cflags     => "-g -O0",
-        release_cflags   => "-O3",
+        cflags           => picker(default => "",
+                                   debug   => "-g -O0",
+                                   release => "-O3"),
         thread_cflag     => "-D_REENTRANT",
         sys_id           => "MACOSX",
         plib_lflags      => "-Wl,-search_paths_first",
@@ -1385,28 +1390,28 @@
     },
     "darwin-ppc-cc" => {
         inherit_from     => [ "darwin-common", asm("ppc32_asm") ],
-        cflags           => "-arch ppc -DB_ENDIAN -Wa,-force_cpusubtype_ALL",
+        cflags           => add("-arch ppc -DB_ENDIAN -Wa,-force_cpusubtype_ALL"),
         perlasm_scheme   => "osx32",
         shared_ldflag    => "-arch ppc -dynamiclib",
     },
     "darwin64-ppc-cc" => {
         inherit_from     => [ "darwin-common", asm("ppc64_asm") ],
-        cflags           => "-arch ppc64 -DB_ENDIAN",
+        cflags           => add("-arch ppc64 -DB_ENDIAN"),
         bn_ops           => "SIXTY_FOUR_BIT_LONG RC4_CHAR",
         perlasm_scheme   => "osx64",
         shared_ldflag    => "-arch ppc64 -dynamiclib",
     },
     "darwin-i386-cc" => {
         inherit_from     => [ "darwin-common", asm("x86_asm") ],
-        cflags           => "-arch i386 -DL_ENDIAN",
-        release_cflags   => "-O3 -fomit-frame-pointer",
+        cflags           => add(picker(default => "-arch i386 -DL_ENDIAN",
+                                       release => "-fomit-frame-pointer")),
         bn_ops           => "BN_LLONG RC4_INT",
         perlasm_scheme   => "macosx",
         shared_ldflag    => "-arch i386 -dynamiclib",
     },
     "darwin64-x86_64-cc" => {
         inherit_from     => [ "darwin-common", asm("x86_64_asm") ],
-        cflags           => "-arch x86_64 -DL_ENDIAN -Wall",
+        cflags           => add("-arch x86_64 -DL_ENDIAN -Wall"),
         bn_ops           => "SIXTY_FOUR_BIT_LONG",
         perlasm_scheme   => "macosx",
         shared_ldflag    => "-arch x86_64 -dynamiclib",
@@ -1429,7 +1434,7 @@
 #
     "iphoneos-cross" => {
         inherit_from     => [ "darwin-common" ],
-        cflags           => "-isysroot \$(CROSS_TOP)/SDKs/\$(CROSS_SDK) -fno-common",
+        cflags           => add("-isysroot \$(CROSS_TOP)/SDKs/\$(CROSS_SDK) -fno-common"),
         sys_id           => "iOS",
     },
     "ios-cross" => {
@@ -1437,13 +1442,13 @@
         # It should be possible to go below iOS 6 and even add -arch armv6,
         # thus targeting iPhone pre-3GS, but it's assumed to be irrelevant
         # at this point.
-        cflags           => "-arch armv7 -mios-version-min=6.0.0 -isysroot \$(CROSS_TOP)/SDKs/\$(CROSS_SDK) -fno-common",
+        cflags           => add("-arch armv7 -mios-version-min=6.0.0 -isysroot \$(CROSS_TOP)/SDKs/\$(CROSS_SDK) -fno-common"),
         sys_id           => "iOS",
         perlasm_scheme   => "ios32",
     },
     "ios64-cross" => {
         inherit_from     => [ "darwin-common", asm("aarch64_asm") ],
-        cflags           => "-arch arm64 -mios-version-min=7.0.0 -isysroot \$(CROSS_TOP)/SDKs/\$(CROSS_SDK) -fno-common",
+        cflags           => add("-arch arm64 -mios-version-min=7.0.0 -isysroot \$(CROSS_TOP)/SDKs/\$(CROSS_SDK) -fno-common"),
         sys_id           => "iOS",
         bn_ops           => "SIXTY_FOUR_BIT_LONG RC4_CHAR",
         perlasm_scheme   => "ios64",
@@ -1568,12 +1573,12 @@
         inherit_from     => [ "BASE_VMS" ],
         template         => 1,
         cc               => "CC/DECC",
-        cflags           => "/STANDARD=RELAXED/NOLIST/PREFIX=ALL/NAMES=(AS_IS,SHORTENED)",
-        debug_cflags     => "/NOOPTIMIZE/DEBUG",
-        release_cflags   => "/OPTIMIZE/NODEBUG",
-        lflags           => "/MAP",
-        debug_lflags     => "/DEBUG/TRACEBACK",
-        release_lflags   => "/NODEBUG/NOTRACEBACK",
+        cflags           => picker(default => "/STANDARD=RELAXED/NOLIST/PREFIX=ALL/NAMES=(AS_IS,SHORTENED)",
+                                   debug   => "/NOOPTIMIZE/DEBUG",
+                                   release => "/OPTIMIZE/NODEBUG"),
+        lflags           => picker(default => "/MAP",
+                                   debug   => "/DEBUG/TRACEBACK",
+                                   release => "/NODEBUG/NOTRACEBACK"),
         shared_target    => "vms-shared",
 
         apps_aux_src     => "vms_decc_init.c",
diff --git a/Configurations/99-personal-levitte.conf b/Configurations/99-personal-levitte.conf
index 9db343e..d1ddf2e 100644
--- a/Configurations/99-personal-levitte.conf
+++ b/Configurations/99-personal-levitte.conf
@@ -1,18 +1,26 @@
 ## -*- mode: perl; -*-
 ## Personal configuration targets
 
+sub picker {
+    my %opts = @_;
+    return sub { add($opts{default} || (),
+                     $opts{$config{build_type}} || ())->(); }
+}
+
 %targets = (
     "levitte-linux-elf" => {
         inherit_from     => [ "linux-elf" ],
-        debug_cflags     => add("-ggdb -g3"),
-        debug_defines    => add("LEVITTE_DEBUG", { separator => undef }),
+        cflags           => add(picker(debug => "-ggdb -g3")),
+        defines          => add(picker(debug => "LEVITTE_DEBUG"),
+                                { separator => undef }),
         build_scheme     => [ "unified", "unix" ],
         build_file       => "Makefile",
     },
     "levitte-linux-x86_64" => {
         inherit_from     => [ "linux-x86_64" ],
-        debug_cflags     => add("-ggdb -g3"),
-        debug_defines    => add("LEVITTE_DEBUG", { separator => undef }),
+        cflags           => add(picker(debug => "-ggdb -g3")),
+        defines          => add(picker(debug => "LEVITTE_DEBUG"),
+                                { separator => undef }),
         build_scheme     => [ "unified", "unix" ],
         build_file       => "Makefile",
     },