[Quantlib-users] Intraday Feature Issue in QuantLib 1.38: Installed Headers Missing datetime.hpp

[Mellisa K. <igo...@gm...>]

I'm trying to build QuantLib with intraday support on Ubuntu (WSL), but
after compiling and installing, I can't find the intraday datetime header
(ql/time/datetime.hpp) and looks like it is not enabled.

In the QuantLib source directory, I ran:

./configure CXXFLAGS="-DQL_USE_DATE_DATETIME -O3" --enable-intraday
make -j$(nproc)
sudo make install

The build logs clearly show that the -DQL_USE_DATE_DATETIME flag is being
passed during compile. For example, during the build I see a lot of lines
like this:

libtool: compile:  g++ -DHAVE_CONFIG_H -I../.. -I../..
-DQL_USE_DATE_DATETIME -O3 -std=c++17 -std=c++17 -MT payoffs.lo
...

After running sudo make install, I ran:

grep -R "QL_USE_DATE_DATETIME" .

and I got the following :

./dev/QuantLib/m4/Makefile:CXXFLAGS = -DQL_USE_DATE_DATETIME -O3 -std=c++17
./dev/QuantLib/test-suite/Makefile:CXXFLAGS = -DQL_USE_DATE_DATETIME
-O3 -std=c++17
./dev/QuantLib/Examples/Makefile:CXXFLAGS = -DQL_USE_DATE_DATETIME -O3
-std=c++17
./dev/QuantLib/config.log:  $ ./configure
'CXXFLAGS=-DQL_USE_DATE_DATETIME -O3' --enable-intraday
./dev/QuantLib/config.log:configure:5339: g++ -c
-DQL_USE_DATE_DATETIME -O3  conftest.cpp >&5
./dev/QuantLib/config.log:configure:5460: g++  -c
-DQL_USE_DATE_DATETIME -O3  conftest.cpp >&5

Despite this, after installation:

When I run:

grep QL_USE_DATE_DATETIME ~/dev/QuantLib/ql/config.hpp

nothing gets printed. Also the intraday header file does not exist:

ls /usr/local/include/ql/time/datetime.hpp

returns:

ls: cannot access '/usr/local/include/ql/time/datetime.hpp': No such
file or directory

Questions:

   - Am I doing something wrong, or is there a specific version I need to
   use? (I'm using QuantLib 1.38.)
   - Why is the macro QL_USE_DATE_DATETIME not appearing in ql/config.hpp
   even though the build logs show the flag is used?
   - Are there additional configuration steps or known issues that could
   cause the intraday support not to be installed properly?

Any help you can offer would be greatly appreciated.


StackOverflow Link
<https://stackoverflow.com/questions/79494184/quantlib-1-38-build-problem-intraday-support-flag-not-reflected-in-config-hpp>