Don't compile PCRE2 JIT if tcc is used.

meson.build

@@ -198,11 +198,7 @@ endif
 # Handle PCRE2
 pcre2_dep_opt = get_option('use_sys_pcre2')
 pcre2_dep = disabler()
-if cc.get_id() == 'tcc'
-  # We require the system library for tcc, because tcc doesn't support
-  # the MSVC asm syntax PCRE2 uses.
-  pcre2_dep = dependency('libpcre2-8', required: true, static: true)
-elif pcre2_dep_opt.enabled() or pcre2_dep_opt.auto()
+if pcre2_dep_opt.enabled() or pcre2_dep_opt.auto()
   pcre2_dep = dependency('libpcre2-8', required: false, static: true)
   if not pcre2_dep.found()
     pcre2_dep = cc.find_library('pcre2', required: true, static: true)

subprojects/packagefiles/pcre2/meson.build

@@ -1,5 +1,7 @@
 project('pcre2', 'c', version: '10.42')
 
+cc = meson.get_compiler('c')
+
 conf_data = configuration_data()
 
 pcre2_chartables = configure_file(input : 'src/pcre2_chartables.c.dist',
@@ -18,7 +20,6 @@ libpcre2_c_args = [
   '-DHAVE_CONFIG_H', # Default values from config.h
   '-DPCRE2_CODE_UNIT_WIDTH=8',
   '-DHAVE_MEMMOVE',
-  '-DSUPPORT_JIT',
   '-DSUPPORT_PCRE2_8',
   '-DSUPPORT_UNICODE',
   '-fvisibility=default',
@@ -35,7 +36,6 @@ pcre2_files = [
   'src/pcre2_error.c',
   'src/pcre2_extuni.c',
   'src/pcre2_find_bracket.c',
-  'src/pcre2_jit_compile.c',
   'src/pcre2_maketables.c',
   'src/pcre2_match.c',
   'src/pcre2_match_data.c',
@@ -54,6 +54,15 @@ pcre2_files = [
   'src/pcre2_xclass.c',
 ]
 
+# tcc doesn't support the MSVC asm syntax PCRE2 uses (`__asm { ... }`).
+# It is used in the JIT compiler code.
+# Because we want to support stuff like tcc + RISC-V (which probably doesn't
+# have a libpcre2 library, we exlcude JIT support for tcc in general).
+if cc.get_id() != 'tcc'
+  libpcre2_c_args += ['-DSUPPORT_JIT']
+  pcre2_files += ['src/pcre2_jit_compile.c']
+endif
+
 pcre2_includes = [
   'src/',
   'src/sljit/',