Make fvp work for anything other than aarch64 when being set as the test machine (#574)

The current picolibc changes can't handle fvp being set as the test
machine for anything other than aarch64. If fvp isn't set, it defaults
to qemu, which works for now because the ARM fvp doesn't require
anything special.
However, when adding new aarch64 big-endian variants, one of the
picolibc patches includes test-machine as an option in the Meson build
scripts. Consequently, the library's CMake needs to set this option
using -Dtest-machine=${TEST_EXECUTOR}. This means that for the armv8.1m
library variant,we are explicitly passing the FPU, which can cause the
error fvp: requested test machine not found since fvps are only defined
for the aarch64 case.

Author: simpal01

arm-runtimes/CMakeLists.txt

@@ -390,6 +390,7 @@ if(C_LIBRARY STREQUAL picolibc)
             -Dmultilib=false
             -Dtests-enable-stack-protector=false
             -Dtest-long-double=${enable_picolibc_long_double_test}
+            -Dtest-machine=${TEST_EXECUTOR}
             -Dnewlib-nano-malloc=${newlib_nano_malloc}
             -Dtests=false
             --prefix <INSTALL_DIR>

patches/picolibc/0002-Add-bootcode-for-AArch64-FVPs.patch

@@ -1,6 +1,6 @@
-From f2ca20cebc85850a50b80424bb0f81c927edd04b Mon Sep 17 00:00:00 2001
+From 3b0b62ce6d81211a71eebe63b4b4ef0732da93ef Mon Sep 17 00:00:00 2001
 From: Simi Pallipurath <[email protected]>
-Date: Thu, 14 Nov 2024 10:12:33 +0000
+Date: Mon, 25 Nov 2024 11:13:50 +0000
 Subject: [PATCH 2/2] [PATCH 2/2] Add bootcode for AArch64 FVPs
 
 The AArch64 FVP (Fixed Virtual Platform) models differ from QEMU in a
@@ -18,12 +18,13 @@ few ways which affect the crt0 code:
  picocrt/machine/aarch64/crt0.S      | 200 +++++++++++++++++++
  picocrt/machine/aarch64/crt0.c      | 198 +++----------------
  picocrt/machine/aarch64/meson.build |   9 +-
+ picocrt/machine/arm/meson.build     |   7 +
  picocrt/meson.build                 | 296 ++++++++++++++++------------
- 6 files changed, 404 insertions(+), 303 deletions(-)
+ 7 files changed, 411 insertions(+), 303 deletions(-)
  create mode 100644 picocrt/machine/aarch64/crt0.S
 
 diff --git a/meson.build b/meson.build
-index 4161d6574..9d3f5c672 100644
+index 012d664bd..b8f43c800 100644
 --- a/meson.build
 +++ b/meson.build
 @@ -151,6 +151,7 @@ multilib_exclude = get_option('multilib-exclude')
@@ -534,6 +535,21 @@ index 808d691a5..923d32c3b 100644
 +    'suffix': '-fvp',
 +  },
 +]
+diff --git a/picocrt/machine/arm/meson.build b/picocrt/machine/arm/meson.build
+index 808d691a5..ecc9a485b 100644
+--- a/picocrt/machine/arm/meson.build
++++ b/picocrt/machine/arm/meson.build
+@@ -33,3 +33,10 @@
+ # OF THE POSSIBILITY OF SUCH DAMAGE.
+ #
+ src_picocrt += files('crt0.c')
++
++picocrt_machines += [
++  {
++    'name': 'fvp',
++    'suffix': '-fvp',
++  },
++]
 diff --git a/picocrt/meson.build b/picocrt/meson.build
 index 76965990f..be8f875be 100644
 --- a/picocrt/meson.build
@@ -868,3 +884,6 @@ index 76965990f..be8f875be 100644
 +  endforeach
 
  endforeach
+-- 
+2.34.1
+