Remove dysfunctional -coverage configure argument

The -coverage argument merely added compiler flags for the Qt build.  It
was never properly ported to the CMake build, and it doesn't seem
feasible to have configure arguments for every possible compiler option.

The same can be achieved by passing the needed compiler option to CMake,
for example: CMAKE_CXX_FLAGS=-fsanitize-coverage=trace-pc-guard

Pick-to: 6.2
Fixes: QTBUG-86227
Change-Id: Ieef9acaedc0a839f9fb35b4403395eea28643864
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>

cmake/configure-cmake-mapping.md

@@ -51,7 +51,6 @@ The following table describes the mapping of configure options to CMake argument
 |                                       | or -DFEATURE_<backend>                            |                                                                 |
 | -sanitize address -sanitize undefined | -DFEATURE_sanitize_address=ON                     | Directly setting -DECM_ENABLE_SANITIZERS=foo is not supported   |
 |                                       | -DFEATURE_sanitize_undefined=ON                   |                                                                 |
-| -coverage <arg>                       |                                                   |                                                                 |
 | -c++std c++20                         | -DFEATURE_cxx20=ON                                |                                                                 |
 | -sse2/-sse3/-ssse3/-sse4.1            | -DFEATURE_sse4=ON                                 |                                                                 |
 | -mips_dsp/-mips_dspr2                 | -DFEATURE_mips_dsp=ON                             |                                                                 |

config_help.txt

@@ -106,11 +106,6 @@ Build options:
                          for example, -sanitize address cannot be combined with
                          -sanitize thread.
 
-  -coverage {trace-pc-guard|source-based}
-                         Specify the 'trace-pc-guard' coverage instrumentation for
-                         sanitizers or generate instrumented code to collect execution
-                         counts and enable code coverage analysis, respectively. (Clang only)
-
   -c++std <edition> .... Select C++ standard <edition> [c++20/c++17/c++14/c++11]
 
   -sse2 ................ Use SSE2 instructions [auto]

configure.cmake

@@ -549,21 +549,6 @@ qt_feature("sanitizer"
     CONDITION QT_FEATURE_sanitize_address OR QT_FEATURE_sanitize_thread OR QT_FEATURE_sanitize_memory OR QT_FEATURE_sanitize_fuzzer_no_link OR QT_FEATURE_sanitize_undefined
 )
 qt_feature_config("sanitizer" QMAKE_PUBLIC_CONFIG)
-qt_feature("coverage_trace_pc_guard"
-    LABEL "trace-pc-guard"
-    AUTODETECT OFF
-)
-qt_feature_config("coverage_trace_pc_guard" QMAKE_PUBLIC_CONFIG)
-qt_feature("coverage_source_based"
-    LABEL "source-based"
-    AUTODETECT OFF
-)
-qt_feature_config("coverage_source_based" QMAKE_PUBLIC_CONFIG)
-qt_feature("coverage"
-    LABEL "Code Coverage Instrumentation"
-    CONDITION QT_FEATURE_coverage_trace_pc_guard OR QT_FEATURE_coverage_source_based
-)
-qt_feature_config("coverage" QMAKE_PUBLIC_CONFIG)
 qt_feature("plugin-manifests"
     LABEL "Embed manifests in plugins"
     AUTODETECT OFF
@@ -1072,12 +1057,6 @@ qt_configure_add_summary_entry(ARGS "sanitize_memory")
 qt_configure_add_summary_entry(ARGS "sanitize_fuzzer_no_link")
 qt_configure_add_summary_entry(ARGS "sanitize_undefined")
 qt_configure_end_summary_section() # end of "Sanitizers" section
-qt_configure_add_summary_entry(
-    TYPE "firstAvailableFeature"
-    ARGS "coverage_trace_pc_guard coverage_source_based"
-    MESSAGE "Code Coverage Instrumentation"
-    CONDITION QT_FEATURE_coverage
-)
 qt_configure_add_summary_build_parts("Build parts")
 qt_configure_add_summary_entry(
     ARGS "appstore-compliant"
@@ -1129,11 +1108,6 @@ qt_configure_add_report_entry(
     MESSAGE "Static builds don't support RPATH"
     CONDITION ( QT_FEATURE_rpath OR QT_EXTRA_RPATHS ) AND NOT QT_FEATURE_shared
 )
-qt_configure_add_report_entry(
-    TYPE ERROR
-    MESSAGE "Command line option -coverage is only supported with clang compilers."
-    CONDITION QT_FEATURE_coverage AND NOT CLANG
-)
 qt_configure_add_report_entry(
     TYPE ERROR
     MESSAGE "Command line option -sanitize fuzzer-no-link is only supported with clang compilers."

qt_cmdline.cmake

@@ -42,7 +42,6 @@ qt_commandline_option(c++std TYPE cxxstd)
 qt_commandline_option(ccache TYPE boolean NAME ccache)
 qt_commandline_option(commercial TYPE void)
 qt_commandline_option(confirm-license TYPE void)
-qt_commandline_option(coverage TYPE coverage)
 qt_commandline_option(dbus TYPE optionalString VALUES no yes linked runtime)
 qt_commandline_option(dbus-linked TYPE void NAME dbus VALUE linked)
 qt_commandline_option(dbus-runtime TYPE void NAME dbus VALUE runtime)

tests/libfuzzer/README

@@ -19,7 +19,7 @@ To run a test with libFuzzer:
 3. Configure Qt with
     -platform linux-clang -sanitize fuzzer-no-link
    or, if you are using clang 5
-    -platform linux-clang -coverage trace-pc-guard
+    -platform linux-clang -- -DCMAKE_CXX_FLAGS=-fsanitize-coverage=trace-pc-guard
    to add the needed code coverage instrumentation. Since speed of execution is crucial for fuzz
    testing, it's recommendable to also use the switches
     -release -static