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QPlugin: make the macros match the scanning code for ELF systems

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For ELF platforms with a GCC-compatible compiler, the QElfParser has
been ignoring the .rodata section ever since Qt 5.0 commit
7443895857 ("Remove support for Qt 4 style
plugins"). That change removed handling of return value
QElfParser::NoQtSection from the ELF parser, which meant that the
plugins without a .qtmetadata section were never considered plugins. In
other words, for those systems, the __attribute__ macro is mandatory.

For systems with a GCC-incompatible compiler, there were only two in Qt
5.x's lifetime: Oracle/Sun Solaris with SunCC and IBM AIX with IBM xlC
compiler. Neither compiler supports C++17 according to [1], so they
can't be in use in Qt 6. IBM xlC now comes with a Clang-based front-end
for users who need Qt 6 and the OpenIndiana distribution of Open Source
Solaris has been using GCC since 2012.

So make the macros mandatory from now on.

[1] https://en.cppreference.com/w/cpp/compiler_support#C.2B.2B17_features

Change-Id: I42eb903a916645db9900fffd16a443745446cc64
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
This commit is contained in:
Thiago Macieira 2021-09-12 20:18:51 -07:00
parent de9d7b0b25
commit 42ec48d819
2 changed files with 2 additions and 2 deletions
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2
src/corelib/plugin/qlibrary.cpp
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@ -273,7 +273,7 @@ static bool findPatternUnloaded(const QString &library, QLibraryPrivate *lib)
char pattern[] = "qTMETADATA ";
pattern[0] = 'Q'; // Ensure the pattern "QTMETADATA" is not found in this library should QPluginLoader ever encounter it.
const ulong plen = ulong(qstrlen(pattern));
#if defined (Q_OF_ELF) && defined(Q_CC_GNU)
#if defined (Q_OF_ELF)
QElfParser::ScanResult r = QElfParser().parse(filedata, fdlen, library, lib, &pos, &fdlen);
if (r == QElfParser::Corrupt || r == QElfParser::NotElf) {
if (lib && qt_debug_component()) {

2
src/corelib/plugin/qplugin.h
View File

@ -88,7 +88,7 @@ Q_DECLARE_TYPEINFO(QStaticPlugin, Q_PRIMITIVE_TYPE);
void Q_CORE_EXPORT qRegisterStaticPluginFunction(QStaticPlugin staticPlugin);
#if (defined(Q_OF_ELF) || defined(Q_OS_WIN)) && (defined (Q_CC_GNU) || defined(Q_CC_CLANG))
#if defined(Q_OF_ELF) || (defined(Q_OS_WIN) && (defined (Q_CC_GNU) || defined(Q_CC_CLANG)))
# define QT_PLUGIN_METADATA_SECTION \
__attribute__ ((section (".qtmetadata"))) __attribute__((used))
#elif defined(Q_OS_MAC)