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

[Luigi B. <lui...@gm...>]

Hi, I answered in the issue you opened for the same problem (
https://github.com/lballabio/QuantLib/issues/2167).

Luigi

On Sat, Mar 8, 2025 at 11:01 AM Mellisa Kruger <igo...@gm...> wrote:

>
> 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>
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