meson: Remove efi-cc option

Changing the efi compiler this way doesn't really work. The gnu-efi
header checks as well as supported compiler flag checks use the
regular cc that meson detects. Changing the compiler this way will
end up with bad compiler flags. For the very same reason, this does
not work with a cross-compiler without going through proper meson
cross-compilation steps either.

The proper way to build systemd-boot with a different compiler is to
use a different build folder and then just use the proper ninja build
target to only build the bootloader/stub.

meson_options.txt

@@ -418,8 +418,6 @@ option('dbus', type : 'combo', choices : ['auto', 'true', 'false'],
 
 option('gnu-efi', type : 'combo', choices : ['auto', 'true', 'false'],
        description : 'gnu-efi support for sd-boot')
-option('efi-cc', type : 'array',
-       description : 'the compiler to use for EFI modules')
 # Note that LLD does not support PE/COFF relocations
 # https://lists.llvm.org/pipermail/llvm-dev/2021-March/149234.html
 option('efi-ld', type : 'combo', choices : ['auto', 'bfd', 'gold'],

src/boot/efi/meson.build

@@ -44,10 +44,6 @@ if not cc.has_header_symbol('efi.h', 'EFI_IMAGE_MACHINE_X64',
 endif
 
 objcopy = find_program('objcopy')
-efi_cc = get_option('efi-cc')
-if efi_cc.length() == 0
-        efi_cc = cc.cmd_array()
-endif
 
 efi_ld = get_option('efi-ld')
 if efi_ld == 'auto'
@@ -62,7 +58,7 @@ efi_libdir = ''
 foreach dir : [get_option('efi-libdir'),
                '/usr/lib/gnuefi' / efi_arch[0],
                run_command('realpath', '-e',
-                        '/usr/lib' / run_command(efi_cc, '-print-multi-os-directory').stdout().strip()).stdout().strip()]
+                        '/usr/lib' / run_command(cc.cmd_array(), '-print-multi-os-directory').stdout().strip()).stdout().strip()]
         if dir != '' and fs.is_dir(dir)
                 efi_libdir = dir
                 break
@@ -275,15 +271,13 @@ if run_command('grep', '-q', '__CTOR_LIST__', efi_lds).returncode() == 0
         ]
 endif
 
-efi_cc_version = run_command(efi_cc, '--version').stdout().split('\n')[0]
-if efi_cc_version.contains('clang') and efi_cc_version.split('.')[0].split(' ')[-1].to_int() <= 10
+if cc.get_id() == 'clang' and cc.version().split('.')[0].to_int() <= 10
         # clang <= 10 doesn't pass -T to the linker and then even complains about it being unused
         efi_ldflags += ['-Wl,-T,' + efi_lds, '-Wno-unused-command-line-argument']
 endif
 
 summary({
         'EFI machine type' :                efi_arch[0],
-        'EFI CC' :                          '@0@'.format(' '.join(efi_cc)),
         'EFI LD' :                          efi_ld,
         'EFI lds' :                         efi_lds,
         'EFI crt0' :                        efi_crt0,
@@ -368,7 +362,7 @@ foreach file : fundamental_source_paths + common_sources + systemd_boot_sources
         o_file = custom_target(file.split('/')[-1] + '.o',
                                input : file,
                                output : file.split('/')[-1] + '.o',
-                               command : [efi_cc, '-c', '@INPUT@', '-o', '@OUTPUT@', efi_cflags],
+                               command : [cc.cmd_array(), '-c', '@INPUT@', '-o', '@OUTPUT@', efi_cflags],
                                depend_files : efi_headers + fundamental_headers)
         if (fundamental_source_paths + common_sources + systemd_boot_sources).contains(file)
                 systemd_boot_objects += o_file
@@ -389,7 +383,7 @@ foreach tuple : [['systemd_boot.so', systemd_boot_efi_name, systemd_boot_objects
                 tuple[0],
                 input : tuple[2],
                 output : tuple[0],
-                command : [efi_cc, '-o', '@OUTPUT@', efi_ldflags, efi_cflags, tuple[2], '-lefi', '-lgnuefi', '-lgcc'],
+                command : [cc.cmd_array(), '-o', '@OUTPUT@', efi_ldflags, efi_cflags, tuple[2], '-lefi', '-lgnuefi', '-lgcc'],
                 install : tuple[3],
                 install_dir : bootlibdir)