fix: Downgrade gcc toolchain on windows

Gcc version 8.0.2 produces coverage reports that are not
readable by lcov(linux-test-project/lcov#38)
As a result we are required to  downgrade the gcc-toolchain

Download older gcc version from http://repo.msys2.org/mingw/x86_64/

Disable optimizations flags for better coverage reports

.appveyor.yml

@@ -11,25 +11,24 @@ environment:
 
 install:
     - SET "PATH=C:\%MSYS2_DIR%\%MSYSTEM%\bin;C:\%MSYS2_DIR%\usr\bin;%PATH%"
-
     - bash -lc "pacman -S --needed --noconfirm mingw-w64-x86_64-qt-creator"
 
     - bash -lc "pacman -S --needed --noconfirm mingw64/mingw-w64-x86_64-hdf5 mingw64/mingw-w64-x86_64-netcdf mingw64/mingw-w64-x86_64-boost"
 
     - bash -lc "pacman -S --needed --noconfirm zlib-devel"
 
     - bash -lc "pacman -S --noconfirm mingw64/mingw-w64-x86_64-curl"
-
+    - bash -lc "/c/projects/ElMaven/gcc_v7.3.0.sh"
     - bash -lc "wget https://github.com/linux-test-project/lcov/releases/download/v1.12/lcov-1.12.tar.gz"
     - bash -lc "tar -xzf lcov-1.12.tar.gz"
     - bash -lc "ln -s $PWD/lcov-1.12/bin/lcov /c/msys64/mingw64/bin/lcov"
     - bash -lc "ln -s $PWD/lcov-1.12/bin/geninfo /c/msys64/mingw64/bin/geninfo"
 
 build_script:
-    - bash -lc "cd C:/projects/ElMaven/ ; echo yes | ./run.sh"
-   # - bash -lc "ls -lR C:/Projects/"
-   # - bash -lc "lcov -b /c/Projects/ElMaven/src/core/libmaven/ --capture --directory /c/projects/build/tmp/maven/ --output-file /c/projects/ElMaven/lcov.info --no-external"
-   # - bash -lc "lcov --summary /c/projects/ElMaven/lcov.info"
+    - bash -lc "cd C:/projects/ElMaven/ ; echo no | ./run.sh"
+    - bash -lc "ls -lR C:/Projects/"
+    - bash -lc "lcov -b /c/Projects/ElMaven/src/core/libmaven/ --capture --directory /c/projects/build/tmp/maven/ --output-file /c/projects/ElMaven/lcov.info --no-external"
+    - bash -lc "lcov --summary /c/projects/ElMaven/lcov.info"
 
 #on_success:
     #- bash -lc "export CODECOV_TOKEN="9a0f9704-6d63-48c6-8c1a-ded361a26597"

gcc_v7.3.0.sh

@@ -0,0 +1,16 @@
+#!/bin/bash
+
+#wget http://repo.msys2.org/mingw/x86_64/mingw-w64-x86_64-gcc-7.3.0-1-any.pkg.tar.xz \
+#     http://repo.msys2.org/mingw/x86_64/mingw-w64-x86_64-gcc-ada-7.3.0-1-any.pkg.tar.xz \
+#     http://repo.msys2.org/mingw/x86_64/mingw-w64-x86_64-gcc-fortran-7.3.0-1-any.pkg.tar.xz \
+#     http://repo.msys2.org/mingw/x86_64/mingw-w64-x86_64-gcc-libgfortran-7.3.0-1-any.pkg.tar.xz \
+#     http://repo.msys2.org/mingw/x86_64/mingw-w64-x86_64-gcc-libs-7.3.0-1-any.pkg.tar.xz \
+#     http://repo.msys2.org/mingw/x86_64/mingw-w64-x86_64-gcc-objc-7.3.0-1-any.pkg.tar.xz
+#
+
+pacman --noconfirm -U mingw-w64-x86_64-gcc-7.3.0-1-any.pkg.tar.xz \
+	  mingw-w64-x86_64-gcc-ada-7.3.0-1-any.pkg.tar.xz \
+	  mingw-w64-x86_64-gcc-fortran-7.3.0-1-any.pkg.tar.xz \
+	  mingw-w64-x86_64-gcc-libgfortran-7.3.0-1-any.pkg.tar.xz \
+	  mingw-w64-x86_64-gcc-libs-7.3.0-1-any.pkg.tar.xz \
+	  mingw-w64-x86_64-gcc-objc-7.3.0-1-any.pkg.tar.xz

src/core/libmaven/libmaven.pro

@@ -22,6 +22,7 @@ win32: QMAKE_CXXFLAGS += -Ofast -ffast-math
             message("adding gcov compiler flags")
             QMAKE_CCFLAGS += -fprofile-arcs -ftest-coverage
             QMAKE_CXXFLAGS += -fprofile-arcs -ftest-coverage
+            QMAKE_CXXFLAGS -= -Ofast -ffast-math
             QMAKE_LFLAGS += -fprofile-arcs -ftest-coverage
             QMAKE_LFLAGS += -lgcov --coverage
         }