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My ~/.saga_gui does not include the libio_gdal.so import. I had to edit it manually (I just re-built today, July 14th, 2021).

I don't have this problem ! If I load lib through gui :

[2021-04-30/10:30:31] Loading library: /usr/lib/saga/libio_gdal.so...has already been loaded

$ cat ~/.saga_gui | grep gdal
LIB_042=libio_gdal.so

OK i manually loaded libio_gdal.so through menu Geoprocessing -> Load Tool library, and GDAl tools appeared in the tools list. After reloading the gdal loads automatically.

... maybe some config files in home directory prevented to load the library before..

Actually, /home/user/.saga_gui contains the list of libraries to be load.

I fully cleared AUR cache and reinstalled SAGA. That did not help.

I found libio_gdal.so in the /usr/lib/saga/ , but SAGA does not load this library during startup without any error.

Did you clean your aur helper files ? I built it today without problems under manjaro as well but I use gdal-ecw package

I tried to rebuild SAGA, however gdal tools did not appear.

However build log showed that gdal is installed in my system: checking for GDAL library... yes checking for OGR support in GDAL library... yes checking if GDAL version is >= 1.7... yes

Yes you need to rebuild saga

After last manjaro update the gdal modules are unable to load in saga. Maybe this is because gdal lib was updated to 3.2.2

SAGA 7.9 PKGBUILD :

# Maintainer: Samuel Fernando Mesa Giraldo <samuelmesa@linuxmail.org>
# Maintainer: SaultDon <sault.don gmail>
# Contributor: Luigi Ranghetti <luigi.ranghetti@gmail.com>
# Contributor: Dominik Fuchs <dominik.fuchs@wur.nl>
# Contributor: Marcelo Avalos Tejeda <marcelo.avalos@gmail.com>

pkgname=saga-gis
_pkgname=saga
pkgver=7.9.0
pkgrel=1
pkgdesc="A Geographic Information System (GIS) software with immense capabilities for geodata processing and analysis."
url="http://www.saga-gis.org"
license=("GPL3")
arch=('i686' 'x86_64')
depends=('wxgtk2'
         'proj' 'lua-hpdf'
         'gdal'
         'libtiff'
         'unixodbc'
         'jasper'
         'swig')
optdepends=('opencv3-opt'
            'vigra'
            'liblas'
            'libharu' 'libsvm')
source=("https://sourceforge.net/projects/saga-gis/files/SAGA - 7/SAGA - ${pkgver}/saga-${pkgver}.tar.gz")
md5sums=('b988d202508ea8387150d13ff9292fa5')

build() {
  cd "${srcdir}/${_pkgname}-${pkgver}"

  autoreconf -i

  ./configure --prefix=/usr \
              --enable-shared \
              --enable-python PYTHON_VERSION=3 PYTHON=/usr/bin/python \
              --with-postgresql=/usr/bin/pg_config \
              --with-gdal=/usr/bin/gdal-config \
              CXXFLAGS="`wx-config --version=3.0 --cxxflags` -I/opt/opencv3/include/" \
              LIBS="`wx-config --version=3.0 --libs`" \
              LDFLAGS="-L/opt/opencv3/lib/"

  msg "Start compiling ..."
  make -j$(nproc)
}

package () {
  cd "${srcdir}/${_pkgname}-${pkgver}"

  make DESTDIR="${pkgdir}" install

  install -Dm644 "${srcdir}/${_pkgname}-${pkgver}/src/saga_core/saga_gui/res/saga.png" \
                   "${pkgdir}/usr/share/pixmaps/${_pkgname}.png"
}

Use the following PKGBUILD with 7.8.1 version I'm in french as well ... type LANG=C in terminal before your command to avoid french words in output !

# Maintainer: Samuel Fernando Mesa Giraldo <samuelmesa@linuxmail.org>
# Maintainer: SaultDon <sault.don gmail>
# Contributor: Luigi Ranghetti <luigi.ranghetti@gmail.com>
# Contributor: Dominik Fuchs <dominik.fuchs@wur.nl>
# Contributor: Marcelo Avalos Tejeda <marcelo.avalos@gmail.com>

pkgname=saga-gis
_pkgname=saga
pkgver=7.8.1
pkgrel=1
pkgdesc="A Geographic Information System (GIS) software with immense capabilities for geodata processing and analysis."
url="http://www.saga-gis.org"
license=("GPL3")
arch=('i686' 'x86_64')
depends=('wxgtk'
         'proj' 'lua-hpdf'
         'gdal'
         'libtiff'
         'unixodbc'
         'jasper'
         'swig')
optdepends=('opencv3-opt'
            'vigra'
            'liblas'
            'libharu' 'libsvm')
source=("https://sourceforge.net/projects/saga-gis/files/SAGA - 7/SAGA - ${pkgver}/saga-${pkgver}.tar.gz")
md5sums=('8f32ca8ee79c3fad1a8a76e6ae99e8fa')

build() {
  cd "${srcdir}/${_pkgname}-${pkgver}"

  autoreconf -i

  ./configure --prefix=/usr \
              --enable-shared \
              --enable-python PYTHON_VERSION=3 PYTHON=/usr/bin/python \
              --with-postgresql=/usr/bin/pg_config \
              --with-gdal=/usr/bin/gdal-config \
              CXXFLAGS="`wx-config --version=3.0 --cxxflags` -I/opt/opencv3/include/" \
              LIBS="`wx-config --version=3.0 --libs`" \
              LDFLAGS="-L/opt/opencv3/lib/"

  msg "Start compiling ..."
  make -j$(nproc)
}

package () {
  cd "${srcdir}/${_pkgname}-${pkgver}"

  make DESTDIR="${pkgdir}" install

  install -Dm644 "${srcdir}/${_pkgname}-${pkgver}/src/saga_core/saga_gui/res/saga.png" \
                   "${pkgdir}/usr/share/pixmaps/${_pkgname}.png"
}