Replace qdtoa and qstrtod implementation by a 3rdparty library

This also fixes the underlying cause of QTBUG-44039 and QTBUG-43885.

You can choose between system, qt, and no libdouble-conversion
support. If you choose "no", snprintf_l and sscanf_l will be
used.

By default, system double conversion is used if the system provides a
double-conversion library. Otherwise the bundled libdouble-conversion
is built. sscanf_l and snprintf_l are not used by default as the
planned "shortest" conversion mode to produce the shortest possible
string will give less precise results when implemented with snprintf_l.

Change-Id: I8ca08a0fca5c54cf7009e48e771385614f6aa031
Reviewed-by: Simon Hausmann <simon.hausmann@theqtcompany.com>

1 files changed, 24 insertions, 0 deletions

diff --git a/src/3rdparty/double-conversion/double-conversion.pri b/src/3rdparty/double-conversion/double-conversion.pri
new file mode 100644
index 0000000000..3207169689
--- /dev/null
+++ b/src/3rdparty/double-conversion/double-conversion.pri
@@ -0,0 +1,24 @@
+INCLUDEPATH += $$PWD/include $$PWD/include/double-conversion
+SOURCES += \
+    $$PWD/bignum.cc \
+    $$PWD/bignum-dtoa.cc \
+    $$PWD/cached-powers.cc \
+    $$PWD/diy-fp.cc \
+    $$PWD/double-conversion.cc \
+    $$PWD/fast-dtoa.cc \
+    $$PWD/fixed-dtoa.cc \
+    $$PWD/strtod.cc
+
+HEADERS += \
+    $$PWD/bignum-dtoa.h \
+    $$PWD/bignum.h \
+    $$PWD/cached-powers.h \
+    $$PWD/diy-fp.h \
+    $$PWD/include/double-conversion/double-conversion.h \
+    $$PWD/fast-dtoa.h \
+    $$PWD/fixed-dtoa.h \
+    $$PWD/ieee.h \
+    $$PWD/strtod.h \
+    $$PWD/include/double-conversion/utils.h
+
+OTHER_FILES += README