meson: Simplify asan-options handling even more

Instead of specifying env variables all the time
we can instead embed the __asan_default_options symbol
in all executables / shared objects. This reduces code
duplication.

src/libexpr-tests/meson.build

@@ -82,7 +82,7 @@ this_exe = executable(
 test(
   meson.project_name(),
   this_exe,
-  env : asan_test_options_env + {
+  env : {
     '_NIX_TEST_UNIT_DATA' : meson.current_source_dir() / 'data',
   },
   protocol : 'gtest',

src/libexpr-tests/package.nix

@@ -62,7 +62,6 @@ mkMesonExecutable (finalAttrs: {
               mkdir -p "$HOME"
             ''
             + ''
-              export ASAN_OPTIONS=abort_on_error=1:print_summary=1:detect_leaks=0
               export _NIX_TEST_UNIT_DATA=${resolvePath ./data}
               ${stdenv.hostPlatform.emulator buildPackages} ${lib.getExe finalAttrs.finalPackage}
               touch $out

src/libfetchers-tests/meson.build

@@ -63,7 +63,7 @@ this_exe = executable(
 test(
   meson.project_name(),
   this_exe,
-  env : asan_test_options_env + {
+  env : {
     '_NIX_TEST_UNIT_DATA' : meson.current_source_dir() / 'data',
   },
   protocol : 'gtest',

src/libfetchers-tests/package.nix

@@ -61,7 +61,6 @@ mkMesonExecutable (finalAttrs: {
             buildInputs = [ writableTmpDirAsHomeHook ];
           }
           ''
-            export ASAN_OPTIONS=abort_on_error=1:print_summary=1:detect_leaks=0
             export _NIX_TEST_UNIT_DATA=${resolvePath ./data}
             ${stdenv.hostPlatform.emulator buildPackages} ${lib.getExe finalAttrs.finalPackage}
             touch $out

src/libflake-tests/meson.build

@@ -58,7 +58,7 @@ this_exe = executable(
 test(
   meson.project_name(),
   this_exe,
-  env : asan_test_options_env + {
+  env : {
     '_NIX_TEST_UNIT_DATA' : meson.current_source_dir() / 'data',
     'NIX_CONFIG' : 'extra-experimental-features = flakes',
     'HOME' : meson.current_build_dir() / 'test-home',

src/libflake-tests/package.nix

@@ -59,7 +59,6 @@ mkMesonExecutable (finalAttrs: {
             buildInputs = [ writableTmpDirAsHomeHook ];
           }
           (''
-            export ASAN_OPTIONS=abort_on_error=1:print_summary=1:detect_leaks=0
             export _NIX_TEST_UNIT_DATA=${resolvePath ./data}
             export NIX_CONFIG="extra-experimental-features = flakes"
             ${stdenv.hostPlatform.emulator buildPackages} ${lib.getExe finalAttrs.finalPackage}

src/libstore-tests/meson.build

@@ -104,7 +104,7 @@ this_exe = executable(
 test(
   meson.project_name(),
   this_exe,
-  env : asan_test_options_env + {
+  env : {
     '_NIX_TEST_UNIT_DATA' : meson.current_source_dir() / 'data',
     'HOME' : meson.current_build_dir() / 'test-home',
     'NIX_REMOTE' : meson.current_build_dir() / 'test-home' / 'store',
@@ -138,7 +138,7 @@ if get_option('benchmarks')
   benchmark(
     'nix-store-benchmarks',
     benchmark_exe,
-    env : asan_test_options_env + {
+    env : {
       '_NIX_TEST_UNIT_DATA' : meson.current_source_dir() / 'data',
     },
   )

src/libstore-tests/package.nix

@@ -83,7 +83,6 @@ mkMesonExecutable (finalAttrs: {
           }
           (
             ''
-              export ASAN_OPTIONS=abort_on_error=1:print_summary=1:detect_leaks=0
               export _NIX_TEST_UNIT_DATA=${data + "/src/libstore-tests/data"}
               export NIX_REMOTE=$HOME/store
               ${stdenv.hostPlatform.emulator buildPackages} ${lib.getExe finalAttrs.finalPackage}

src/libutil-tests/meson.build

@@ -97,7 +97,7 @@ this_exe = executable(
 test(
   meson.project_name(),
   this_exe,
-  env : asan_test_options_env + {
+  env : {
     '_NIX_TEST_UNIT_DATA' : meson.current_source_dir() / 'data',
   },
   protocol : 'gtest',

src/libutil-tests/package.nix

@@ -61,7 +61,6 @@ mkMesonExecutable (finalAttrs: {
               mkdir -p "$HOME"
             ''
             + ''
-              export ASAN_OPTIONS=abort_on_error=1:print_summary=1:detect_leaks=0
               export _NIX_TEST_UNIT_DATA=${./data}
               ${stdenv.hostPlatform.emulator buildPackages} ${lib.getExe finalAttrs.finalPackage}
               touch $out

src/nix/asan-options.cc

@@ -1,6 +0,0 @@
-extern "C" [[gnu::retain]] const char * __asan_default_options()
-{
-    // We leak a bunch of memory knowingly on purpose. It's not worthwhile to
-    // diagnose that memory being leaked for now.
-    return "abort_on_error=1:print_summary=1:detect_leaks=0";
-}

src/nix/meson.build

@@ -61,7 +61,6 @@ subdir('nix-meson-build-support/generate-header')
 nix_sources = [ config_priv_h ] + files(
   'add-to-store.cc',
   'app.cc',
-  'asan-options.cc',
   'build.cc',
   'bundle.cc',
   'cat.cc',