build: Use enabled by for defaults

Merge the "default" and "default-by-variant" attributes.  Use an
"enabled-by" expression to select the default value based on the enabled
set.  This makes it possible to select default values depending on other
options.  For example you could choose memory settings based on whether
RTEMS_SMP is enabled or disabled.

The change was tested by comparing the output of

  ./waf bspdefaults

before and after the change.

spec/build/bsps/sparc/erc32/abi.yml

@@ -7,8 +7,9 @@ build-type: option
 copyrights:
 - Copyright (C) 2020 embedded brains GmbH (http://www.embedded-brains.de)
 default:
-- -mcpu=cypress
-default-by-variant: []
+- enabled-by: true
+  value:
+  - -mcpu=cypress
 description: |
   ABI flags
 enabled-by: true

spec/build/bsps/sparc/erc32/optconirq.yml

@@ -5,8 +5,9 @@ actions:
 build-type: option
 copyrights:
 - Copyright (C) 2020 embedded brains GmbH (http://www.embedded-brains.de)
-default: 0
-default-by-variant: []
+default:
+- enabled-by: true
+  value: 0
 description: |
   The erc32 console driver can operate in either polled or interrupt mode.  Under the simulator (especially when FAST_UART is defined), polled seems to operate better. It is common for a task to print a line (like the end of test message) and then exit.  In this case, the program returns control to the simulator command line before the program has even queued the output to the uart.  Thus sis has no chance of getting the data out.
 enabled-by: true

spec/build/bsps/sparc/erc32/optpwrdwnhlt.yml

@@ -5,8 +5,9 @@ actions:
 build-type: option
 copyrights:
 - Copyright (C) 2020 embedded brains GmbH (http://www.embedded-brains.de)
-default: false
-default-by-variant: []
+default:
+- enabled-by: true
+  value: false
 description: |
   If defined, CPU is spinning on fatal exit. Otherwise generate system error which will hand over to debugger, simulator, etc.
 enabled-by: true

spec/build/bsps/sparc/leon2/abi.yml

@@ -7,13 +7,13 @@ build-type: option
 copyrights:
 - Copyright (C) 2020 embedded brains GmbH (http://www.embedded-brains.de)
 default:
-- -mcpu=leon
-default-by-variant:
-- value:
+- enabled-by: sparc/at697f
+  value:
   - -mcpu=leon
   - -mfix-at697f
-  variants:
-  - sparc/at697f
+- enabled-by: true
+  value:
+  - -mcpu=leon
 description: |
   ABI flags
 enabled-by: true

spec/build/bsps/sparc/leon2/optconirq.yml

@@ -5,8 +5,9 @@ actions:
 build-type: option
 copyrights:
 - Copyright (C) 2020 embedded brains GmbH (http://www.embedded-brains.de)
-default: 0
-default-by-variant: []
+default:
+- enabled-by: true
+  value: 0
 description: |
   The leon2 console driver can operate in either polled or interrupt mode.  Under the simulator (especially when FAST_UART is defined), polled seems to operate better. It is common for a task to print a line (like the end of test message) and then exit.  In this case, the program returns control to the simulator command line before the program has even queued the output to the uart.  Thus sis has no chance of getting the data out.
 enabled-by: true

spec/build/bsps/sparc/leon2/optpwrdwnhlt.yml

@@ -5,8 +5,9 @@ actions:
 build-type: option
 copyrights:
 - Copyright (C) 2020 embedded brains GmbH (http://www.embedded-brains.de)
-default: false
-default-by-variant: []
+default:
+- enabled-by: true
+  value: false
 description: |
   If defined, CPU is spinning on fatal exit. Otherwise generate system error which will hand over to debugger, simulator, etc.
 enabled-by: true

spec/build/bsps/sparc/leon3/abi.yml

@@ -7,23 +7,21 @@ build-type: option
 copyrights:
 - Copyright (C) 2020 embedded brains GmbH (http://www.embedded-brains.de)
 default:
-- -mcpu=leon3
-default-by-variant:
-- value:
+- enabled-by: sparc/ut700
+  value:
   - -mcpu=leon3
   - -mfix-ut700
-  variants:
-  - sparc/ut700
-- value:
+- enabled-by: sparc/ut699
+  value:
   - -mcpu=leon
   - -mfix-ut699
-  variants:
-  - sparc/ut699
-- value:
+- enabled-by: sparc/gr712rc
+  value:
   - -mcpu=leon3
   - -mfix-gr712rc
-  variants:
-  - sparc/gr712rc
+- enabled-by: true
+  value:
+  - -mcpu=leon3
 description: |
   ABI flags
 enabled-by:

spec/build/bsps/sparc/leon3/abiclang.yml

@@ -7,26 +7,23 @@ build-type: option
 copyrights:
 - Copyright (C) 2020 Hesham Almatary <Hesham.Almatary@cl.cam.ac.uk>
 default:
-- -mcpu=leon3
-default-by-variant:
-- value:
+- enabled-by: sparc/ut700
+  value:
   - -mcpu=leon3
   - -mfix-ut700
-  variants:
-  - sparc/ut700
-- value:
+- enabled-by: sparc/ut699
+  value:
   - -mcpu=leon
   - -mfix-ut699
-  variants:
-  - sparc/ut699
-- value:
+- enabled-by: sparc/gr712rc
+  value:
   - -mcpu=gr712rc
-  variants:
-  - sparc/gr712rc
-- value:
+- enabled-by: sparc/gr740
+  value:
   - -mcpu=gr740
-  variants:
-  - sparc/gr740
+- enabled-by: true
+  value:
+  - -mcpu=leon3
 description: |
   ABI flags
 enabled-by:

spec/build/bsps/sparc/leon3/optconirq.yml

@@ -5,8 +5,9 @@ actions:
 build-type: option
 copyrights:
 - Copyright (C) 2020 embedded brains GmbH (http://www.embedded-brains.de)
-default: 0
-default-by-variant: []
+default:
+- enabled-by: true
+  value: 0
 description: |
   The leon3 console driver can operate in either polled or interrupt mode.  Under the simulator (especially when FAST_UART is defined), polled seems to operate better.
 enabled-by: true

spec/build/bsps/sparc/leon3/optleon3smp.yml

@@ -5,8 +5,9 @@ actions:
 build-type: option
 copyrights:
 - Copyright (C) 2020 embedded brains GmbH (http://www.embedded-brains.de)
-default: true
-default-by-variant: []
+default:
+- enabled-by: true
+  value: true
 description: |
   Always defined when on a LEON3 to enable the LEON3 support for determining the CPU core number in an SMP configuration.
 enabled-by: true

spec/build/bsps/sparc/leon3/optpwrdwnhlt.yml

@@ -5,8 +5,9 @@ actions:
 build-type: option
 copyrights:
 - Copyright (C) 2020 embedded brains GmbH (http://www.embedded-brains.de)
-default: false
-default-by-variant: []
+default:
+- enabled-by: true
+  value: false
 description: |
   If defined, CPU is powered down on fatal exit. Otherwise generate system error which will hand over to debugger, simulator, etc.
 enabled-by: true